CA2084999C - Papermaking belt and method of making the same using a deformable casting surface - Google Patents

Papermaking belt and method of making the same using a deformable casting surface

Info

Publication number
CA2084999C
CA2084999C CA002084999A CA2084999A CA2084999C CA 2084999 C CA2084999 C CA 2084999C CA 002084999 A CA002084999 A CA 002084999A CA 2084999 A CA2084999 A CA 2084999A CA 2084999 C CA2084999 C CA 2084999C
Authority
CA
Canada
Prior art keywords
reinforcing structure
belt
paper
facing side
coating
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
CA002084999A
Other languages
French (fr)
Other versions
CA2084999A1 (en
Inventor
Paul Dennis Trokhan
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Procter and Gamble Co
Original Assignee
Procter and Gamble Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Procter and Gamble Co filed Critical Procter and Gamble Co
Publication of CA2084999A1 publication Critical patent/CA2084999A1/en
Application granted granted Critical
Publication of CA2084999C publication Critical patent/CA2084999C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • DTEXTILES; PAPER
    • D21PAPER-MAKING; PRODUCTION OF CELLULOSE
    • D21FPAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
    • D21F11/00Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
    • D21F11/006Making patterned paper
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/10Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation for articles of indefinite length
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/222Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length characterised by the shape of the surface
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C43/00Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
    • B29C43/22Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
    • B29C43/28Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0827Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using UV radiation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/0002Condition, form or state of moulded material or of the material to be shaped monomers or prepolymers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29LINDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00Other particular articles
    • B29L2031/733Fourdrinier belts
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/24Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24273Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/24Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24273Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
    • Y10T428/24298Noncircular aperture [e.g., slit, diamond, rectangular, etc.]
    • Y10T428/24306Diamond or hexagonal
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/24Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24273Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
    • Y10T428/24322Composite web or sheet
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00Stock material or miscellaneous articles
    • Y10T428/24Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24273Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
    • Y10T428/24322Composite web or sheet
    • Y10T428/24331Composite web or sheet including nonapertured component

Abstract

A backside textured papermaking belt is disclosed which is comprised of a framework and a reinforcing structure. The framework has a first surface which defines the paper-contacting side of the belt, a second surface opposite the first surface, and conduits which extend between first and second surfaces of the belt. The first surface of the framework has a paper side network formed therein which defines the conduits. The second surface of the framework has a backside network with passageways that provide surface texture irregularities in the backside network. The papermaking belt is made by applying a coating of photosensi-tive resinous material to the reinforcing structure and pressing the reinforcing structure into a deformable surface, so that the de-formable surface forms protrusions which exclude resin from certain areas which when cured will lie along the backside of the belt, and then exposing the photosensitive resinous material to light of an activating wavelength through a mask which has trans-parent and opaque regions. A process for making paper products is also disclosed which involves applying a fluid pressure dif-ferential from a vacuum source through the belt to a partially-formed embryonic web of papermaking fibers. The fibers in the em-bryonic web are deflected into the conduits of the papermaking belt by the vacuum pressure while the papermaking belt and the embryonic web travel over the vacuum source. Following the deflection, the paper web is impressed with the paper side network of the belt, and dried to form the final product.

Description

~ 208~9~
PAPERMAKING BELT AND METHOD OF MAKING THE
SAME USING A DEFORMABLE CASTING SURFACE
.

FIELD OF THE INVENTION
The present inYention generally relates to papermaking belts useful in papermaking machines for making strong, soft, absorbent paper products. This invention is also concerned with a method of making such a papermaking belt and papermaking processes which employ these papermaking belts. More particularly, this invention o is concerned with papermaking belts comprised of a resinous framework and a reinforcing structure which have a texture on the~r machine-contacting side, or backside. The texture is imparted to the belt by applying a coating of resinous material to the reinforcing structure and pressing the reinforcing structure i nto a deformabl e surface so that the deformabl e surface forms protrusions which exc1ude resin from certain areas which when cured will lie along the backside of the belt.
BACKGROUND OF THE INVENTION
One pervasive feature of d~ily life in modern industrialized societies is the use of paper products for a variety of purposes.
Paper towels, facial tissues, toilet tissue, and the like are in almost constant use. The large demand for such paper products has created a demand for improved versions of the products and of the methods of their manufacture. Despite great strides ln paper making, research and development efforts continue to be aimed at improving both the products and their processes of manufacture.
Paper products such as paper towels, facial tlssues, toilet tissue, and the like are made from one or more webs of tissue paper. If the products are to perform their intended tasks and to WO 92/00416 PCI'/US91/04258 08~Lg-95~ 2 - f~nd wide acceptance, they, and the tissue paper webs from which they are made, must exhibit certain physical characteristics.
Among the more important of these characteristics are strength, softness, and absorbency.
Strength is the ability of a paper web to retain its physical integrity during use.
Softness is the pleasing tactile sensation one perceives when they crumple the paper in their hands and when they use the paper for its intended purpo ,~.
o Absorbency is ~he characteristic of the paper which allows it to take up and retain fluids, particularly water and aqueous solutions and suspensions. In evaluating the absG~L~ of paper, not only is the absolute quantity of fluid a given amount of paper will hold significant, but the rate at which the paper will absorb the fluid is also important. In addltion, when the paper is formed into a product such as a towel or wipe, the ability of the paper to cause a fluid to be taken up into the paper and thereby leave a dry wiped surface is also important.
Processes for the manuficturing of paper producis for use in tissue, toweling and sanitary products generally involve the preparation of an aqueous slurry of paper fibers and then Lly removing the water from the slurry while contl ~ - ~ly rearranging the fibers in the slurry to form a paper web. Various types of machinery can be employed to assist in the dewatering process.
Currently, most manufacturing processes either employ machines which are known as Fourdrinier wire papermaking machines or machines which are known ~s twin (Fourdrinier) wire papermachines. In Fourdrinier wire papermaking machines, the paper slurry is fed onto the top surface of a traveling endless belt, which serves as the initial papermaking surface of the !

" .:
, WO 92~004t6 PCI/US91~042~8 3 208s4;99~1 machine. In twin wire machines, the slurry is deposited between a piir of converging Fourdrinier wires in which the initial dewatering and rearranging in the papermaking process are carried out .
After the initial forming of the paper web on the Fourdrinier ` wlre or wires, both types of machines generally carry the paper web through a drying process or processes on another fabric in the form of an endless belt which is often different from the Fourdrinier wire or wires. This other fabric is sometimes referred to as a drying fabric. Numerous arrangements of the Fourdrinier wire(s) and the drying fabric(s) as well as the drying process~es) have been used successfully and somewhat less than successfully. The drying processtes) can involve mechanical compaction of the paper web, vacuum dewatering, drying by blowing heated air through the paper web, and other types of processes.
As seen above, papermaking belts or fabrics carry various names depending on their intended use. Fourdrinier wires, also known as Fourdrinier belts, forming wires, or forming fabrics are those which are used in the initial forming zone of the papermaking machine. Dryer fabrics as noted above, are those which carry the paper web through the drying operation of the papermaking machine. Various other types of belts or fabrics are possible also. Most papermaking belts employed in the past are commonly formed from a length of woven fabric the ends of which have been joined together in a seam to form an endless belt.
Woven papermaking fabrics generally comprise a plurality of spaced longitud1nal warp threads and a plurality of spaced transverse weft threads which have been woven together in a specific weaving pattern. Prior belts have included single layer (of warp and weft threads) fabrics, multilayered fabrlcs, and fabrics with several layers each of which comprises interwoven warp and weft threads.
Initially, the threads of papermaking fabrics were made from wires comprised of materials such as phosphor bronze, bronze, stainless steel, brass or combinations thereof. Often v~rious materials 4 2as~s99 were placed on top of and affixed to the fabrics to attempt to make the dewatering process more efficient. Recently, ~n the papermaking fie1d, it has been found that synthetic materials may be used in whole or part to produce the underlying wire structures, which are superior in qual ity to the forming ~ireS
made of metal threads. Such synthetic materials have included Nylon, polyesters, acryl ic fibers and copolymers . While many different processes, fabrics, and a"...3~ ts of these fabri~s have been used, only certain of these processes, fabrics. and ar,.. , ts of these fabrics have resulted in commercially successful paper products.
, An example of paper webs which have been widely accepted by the consuming publ ic are those made by the process described in U.S. Patent No. 3,301,746 issued to Sanford and Sisson on January 31, 1967. Other witely accepted paper products are made by the process described in U.S. Patent No. 3,994,771 issued to Morgan and Rich on November 30, 1976. Despite the high qual ity of products made by these two processes, however, the search for still improved products has, as noted above, continued.
Another commercially significant i,: o;. t was made upon the above paper webs by the process described in U.S. Patent No.
4,529,480 issued to Trokhan on July 16, 1985.
The i . ~.. rt included utiiizing a paperm~king belt (which w~s termed ~ "deflection member~) comprised of a foraminous woven member which w~s ,u" ~,.,.,d~d by a h~rdened photosensitive resin fr~mework. The resin r, ..~ w~s provided with a plurality of discrete, isolated, ch~nnels known as "deflection conduits." The process in which this deflection member was used involved, among other steps, associating an embryonic web of papermaking fibers wlth the top surface of the deflection member and applying a vacuum or other fluid pressure differentlal to the web from the backside (machine-contacting side) of the deflection member. The papermaking belt used in this process was termed a ~deflection Bi, S 2084999 =
.
memberN bec~use the papermaking fibers would be deflected into and rearranged into the deflection conduits of the hardened resin framework upon the application of the fluid pressure differential.
By util izing the aforementioned improved papermaking process as noted below it was finally possible to create paper having certain desired preselected characteristics.
The def1ection member described in the aforementioned patent issued to Trokhan was made by the process described in U.S. Patent No. 4 514 345 issued in the name of Johnson et al.
The process descri bed i n the Johnson et al. patent includes the steps of: l) coating the foraminous woven element with a photosensitive resin; 2) controlling the thickness of the photosensitive resin to a preselected value; 3) exposing the resin to a l ight having an lS activ~ting wave length through ~ mask having opaque and transparent regions; and 4) removing the uncured resin. This process produced a deflection member with a r, ~.~ which had a paper web-contact1ng surface and a machine-contactlng surface that were each provided with ~ network p~ttern surrounding the conduits which was essenti~lly monoplan~r or smooth.
The p~per produced using the process disclosed in U.S. Patent 4 529 480 is described in U.S. Patent 4 637 859 issued in the name of Trokhan . Thi s p~per is ch~racterized by having two physic~lly distinct regions distributed across its surf~es. One of the regions is a continuous network region which h~s a relatively high density and hiqh intrinsic strength. The other region is one which is comprised of a plurality of domes which are completely encircled by the network region. The domes in the latter region h~ve rel~tively low densities and relatively low intrinsic strengths compared to the network region.
The p~per produced by the process described in U.S. Patent 4 529 480 w~s actually stronger softer~ ~nd more absorbent than B,:;~

WO 92/00416 PCr/US91104258 - ~ 6
2~84999 the paper produced by the preceding processes as a result of several factors. The strength of the paper produced was increased as a result of the relatively ht~h intrinsic strength provided by the network region. The softness of the paper produced was increased as a result of the provision of the plurality of low density domes across the surface of the paper. The absolute quantity of fluid the paper would hold (one of the key factors in determining the absG.l,..,~y of the paper) was increased due to the fact that the overall density of the paper was reduced.
Although the aforementioned improved process worked quite well, it has been found that when the deflection member of the above-described proc~ess passed over vacuum dewatering eqipment used in the papermaking process, certain undesirable events occurred . Of most concern was the fact that a 1 arge number of lS partially dewatered fibers in the paper web would pass completely through the deflection member. This would lead to the undesirable result of clogging the vacuum dewatering machinery with the more mobile paper fibers. Another undesirable oc.u..e -e was the tendency of these mobile paper fibers to accumulate on the dewatering machinery to the extent of producing clumps of fibers on the machinery. This accumulation of fibers would cause the previous papermaking belts which had smooth backsides to wrinkle and develop folds, particularly longitudinal folds, after they repeatedly traveled over the dewatering machinery during the 2s papermaking process, which in turn would not only result in severe problems with the moisture and physical property profiles of the paper produced, but would result in the eventual failure of the papermaking belt.
The significance of the difficulties experienced with these prior belts was increased by the relatively high cost of the belts. In most cases, manufacturing the foraminous woven element which was incorporated into these belts required (and still requires) expensive textile processing operations, including the use of large ~nd ~ostly loo-s. Als~ ~ubstantial quantities of - - -WO 92/00416 PCIJUS91~04258 ~ 2 0 8 $ 9 9 ~
relatively expensive filaments are incorporated into these woven elements. The cost of the belts is further increased when high heat resistant filaments properties are employed, which is generally necessary for belts which pass through a drying operation .
In addition to the cost of the belt itself, the failure of a papermaki ng bel t wi l l al so haYe seri ous impl i cat i ons on the efficiency of the papermaking process. A high frequency of paper machine belt failures can substantially affect the economies of a paper manufacturing business due to the loss of the use of the expensive papermaking machinery (that ls, the machine "downtimen) during the time a replacement belt is being fitted on the papermaking machine.
At the time the papermaking process described in U.S. Patent 4,529,480 was developed it was believed that the network formed in the lower surface of the resinous framework (the machine-contacting surface) had to be essentially planar in order to achieve the desired 5 'd --5C of application of vacuum pressure needed to deflect and rearrange the fibers into the deflection conduits to form the dome regions in the improved paper .
While not wishing to be bound by any theory, it is now bel ieved that the problems which developed when using the prior smooth backsided papermaking belts may have been at least partially the result of the extremely sudden application of vacuum pressure to the paper web when i t passed over the vacuum dewatering machinery. It is believed that the prior smooth backsided papermaking belts would actually temporarily create a seal over the vacuum source . Then, when the open channel s (the . 30 deflection conduits) of the papermaking belt of the prior type were encountered, the vacuum pressure would be appl ied to the water laden, highly mobile fibers in the fibrous web situated on top of the resin framewo~rk in an eYtr~ely sudden fashion. This -8 20849g sudden application of Yacuum pressure is believed to have caused the sudden deflection of the mobile fibers which was sufficient to allow them to pass completely through the papermaking belt. It is also believed that this sudden application of vacuum pressure and migration of fibers would account for pin-sized holes in the dome regions of the finished paper which in some but not all cases are undes i rabl e .
Another theory for the excessiYe accumulation of paper fibers on the surfaces of the vacuum dewatering equipment is that the prior smooth backsided papermaking belts did not have adequate - surface texture on their backsides. It is belieYed that a certain ~mount of surface texture is necess~ry to enable such resin-co~ted belts to remove the paper fibers which accumulate on the vacuum dewatering equipment by the abr~sive action of such a belt traveling over the v~cuum dewatering equipment.
As a result a need exists for an improved papermaking process which will not be plagued by the undesirable buildup of these mobile papermaking fibers on the vacuum dewatering machinery employed in the process. A need therefore also exists for an improved papermaking belt and a method of making the same which will eliminate the foregoing problems c~used by utilizing a papermaking belt made by the prior processes.
Therefore, it is an object of an aspect of the present invention to provide an 1 ~ ,v~d p~ro~k~n~
2j process in which the migration of the aforementioned mobile paper fibera i8 ~ubatantially reduced, or eliminated .
It is an object of an a3pect of the present invention to provide a p~. k~n~ belt which will sub~tantially reduce the previous problem of the buildup of paper fiber~ o~ the vacuum dewatering ~~rllin~l~y which wag ag~;ociated with the prior resin coated pap~ kin~ belts.
BJil , 9 2~84999 It i8 an object of an a9pect of the present invention to reduce the folding and subsequent failures of the pap~ k;"~ belts due to the n~ Ation of paper fibers on the surface of the vacuum dewatering equipment employed in the pap~-k;n~ process.
It i9 an object of an aspect of the present invention to develop a pap~ kin~ process which will result in the elimination oi~ the pin-sized holes in the dome regions of the f;n; ~hed paper web (unless such holes are a desirable characteristic for the particular paper being produced).
It is an ob; ect of an aspect of the present invention to provide a pAr~-k;n~ belt which has passageways that provide surface texture irregularities on the b~-k~ of the belt and a method of making this belt in which these passageways can be imparted to the belt without sacrificing the strength of the entire pAr~T~kins belt.
It is an object of an aspect of the present invention to provide a pap~ ki n~ belt, which when employed in the pap~~k; n~ process of the present invention will have a longer life than prior pap~-k;ng belts, and a method of making this pap~ k;ns belt which i8 cost effective.
These and other obj ects of the present inventio~
will be more readily apparent when c~nAi~ ed in reference to the following description and when taken in conjunction with the AC_ _ ylng drawings.
Sl~IARY OF T~IE , NV "~,Ll~JN.
The bA~ k~i~P textured p~rPrr-k;ng belt of the present invention is generally comprised of two primary elements: a L- k and a reinforcing structure. When the papPrr~-k;n~ belt of the present invention is in its preferred form, it is an endless belt which has a paper-contacting side and a textured B

WO 9~/00416 2 0 8 4 9 9 9 PCI /US91/04258 `~ 10 ' _ _--. -- ~
backside, opposite the paper-contact~ng side, which contacts the machinery employed in the papermaking process. The framework is preferably a hardened polymeric photosensitive resinous framework which has a first surface which defines the paper-contacting side of the belt, a second surface opposite the first surface, and conduits extending between the first and second surfaces. The first surface of the framework has a paper side network formed therein which surrounds and defines the openings of the conduits.
The second surface of the framework has a backside network with passageways therein which are distinct from the conduits. The passageways provide suriace texture irregularities in the backside network of the second surface. The reinforcing structure is positioned between the first surface of the framework and at least a portion of the second surface of the framework and serves to strengthen the framework. The reinforcing structure has a paper-facing side and a machine-facing side opposite the paper-facing side. The reinforcing structure also has interstices and a reinforcing component comprised of a plurality of structural components, along with a projected open area defined by the projection of the areas defined by the interstices, and a proJected reinforcing area defined by the projection of the reinforcing component. In addition, portions of some of the structural components are disposed inward of the plane defined by the machine-facing side of the reinforcing structure to form raised portions. The pos~tion of the passageways in the backside network of the second surface of the framework relative to the reinforcing structure is such that the passageways are disposed inward of the plane defined by the machine-facing side of the reinforcing structure. In addition, a multiplicity of the passageways are disposed between the plane defined by the machine-facing side of the reinforcing structure and the raised portions of the structural components. Preferably, at least portions of a multiplicity of the ~csa, .ys are also pos~tioned in ~he interstices of the reinforcing structure so that a portion of the projected area of those p2ssa, l~, cu., ~ ~ with a portion of the projected open area of the reinforc~ng structure.
, . . . . .

~ 11 2084999 The surface of the backside of the belt is textured 80 that the backside surface has sufficient fluid passage capacity to permit at least about 1, 800 standard cubic centimeters/mi~ute of air to escape across the textured surface.
Various aspects of the invention are as follows:
A papermaking belt having a paper-contacting stde and a textured backside opposite said paper-contacting side, said papermak i ng bel t compr i s i ng:
a framework having a first surface defining said paper-contacting side of said belt, a second surface opposite said first surface, ant conduits extending between said first surface and said second surface, said first surface haYing a paper side network defining said conduits, said second surface having a backside network with passageways, distinct from said conduits, that provide surface texture irregularities in said backside network;
a reinforcins structure positioned between said first surface and at least a portion of said second surface, said reinforcing structure having a paper-facing side, a machine-facing side opposite said paper-facing side, interstices, a reinforcing component comprised of a p~urality of structural components, a projected open area defined by the projection of the areas defined by said interstices, and a projected reinforcing area defined by the projection of said reinforcing . ,-.,_..t, wherein portions of some of said structural components are disposed inward of the plane defined by the machine-facing side of said reinforcing structure to form raised portions; and said passageways are disposed inward of the plane defined by the machine-facing side of said reinforcing structure, and a multiplicity of passageways are disposed between the plane B!l _ _ _,, ,, _ . _ _ _,, ... _ ... .. _ 2084~9 defined by said machine-fa~ing side of said reinforcing structure and said raised portions of said structural ~omponents, and said backside surface has sufficient fluid passage capacity to permit at least about 1,800 standard cubic centimeters/minute of air to escape across said textured surface~

A method of making a papermaking belt having a textured backside, said papermaking belt comprising a reinforcing structure and a resinous framework having a first surface, a second surface opposite said first surface, and conduits extending between said first surface and said second surface, said first surface having a paper side network formed therein defining said conduits, said second surface having a backside network with passageways, distinct from said csnduits. that provide surface texture irregularities in said backside network, the method comprising the steps of:
(a) providing a forming unit with a deformable, constant vol ume, worki ng surface;

(b) providing a reinforcing structure having a paper-facing side, a machine-facing side opposite said paper-facing side, interstices, and a reinforcing component comprised of a plurality of structural components, portions of some of said structural components being disposed inward of the plane defined by the machine-facing side of said reinforcing structure to form raised portions;
(c) bringing at least a portion of said machine-facing side of said reinforcing structure into contact with said working surface of said forming unit;
(d) pressing said machine-facing side of said reinforcing structure into said deformable, constant volume, working surface to cause portions of said working surface of B

208499~

said forming unit to deform and form protrusions between the plane defined by the machine-facing side of the reinforcing structure and some of said raised portions of said structural components and in some of said interstices;
(e) applying a coating of liquid photosensitive resin to at least one side of said reinforcing structure so that said coating substantially fills the void areas of said reinforcing structure and forms a first surface and a second surface, said coating being distributed so that at least a portion of said second surface of said coating is positioned adjacent said working surface of s~id forming unit, said paper-facing side of said reinforcing structure is positioned between said first and second surfaces of said coating, and the portion of said coating which is positioned between said first surface of said coating and said paper-facing side of said reinforcing structure forms a resinous ove. Lur~n.
wherein said protrusions in said working surface exclude portions of said coating along said second surface of said coating from some of the spaces which l ie between the plane defined by the machine-facing side of said reinforcing structure and said raised portions and also from portions of at least some of said interstices to form excluded areas in said second surface of said coating which are defined by said protrusions;
(f) controlling the th~ckness of said o~_.Lu.dLn to a presel ected val ue;
(9) proYiding a mask haYing opaque and transparent regions, s~id opaque regions together with said transparent regions defining ~ preselected pattern in said mask;
B

(h) positioning said mask between said coating of 1 iquid photosensittve resin and an actinic 1 ight source so that said mask is in contacting rel~tlon with said first surface of said coating, said opaque regions of said mask shielding a portion of said coating from the 1 ight rays of said 1 ight source and said transparent regions leaYing other portions of said coating unshielded (i) curing said unshielded portions of said coating of liquid photosensitive resin and leaving said shielded portions uncured by exposing said coating of 1 iquid photosensitive resin to said 1 ight source through said mask to form a partially-formed composite belti and (j) removing substantially all uncured liquid photosensitive resin from said partially-formed composite belt to leave a hardened resin framework around at least a portion of said reinforcing structure, which framework has a plural ity of conduits in those regions which were shielded from said 1 ight rays by the opaque regions of the mask and passageways which provide surface texture irregularities in the backside network of said framework in those portions of said backside network ~hich correspond to the places where the second surface of the coating was defined by the protrusions in the working surface of the forming unit.

A method of making a papermaking belt having a textured backside, s~id papermaking belt comprising a reinforcing structure and a resinous framework having a first surface, a second surface opposite said first surface, and conduits extending between said first surface and said second surface, said first surface having a paper side network formed therein defining said ~onduits, said second surface having a backside ~2 ~j . . 2084999 14a network with passageways, distinct from said conduits, that provide surface texture irregularities in said backside network, the method comprising the steps of:
(a) providing a forming unit which comprises a drum having a circular cross-sect~on, said forming unit being provided with a deformable, constant volume, working surface;

(b) providing a reinforcing structure having a paper-facing side, a machine-facing side opposite said paper-facing side, interstices, and a reinforcing component comprised of a plural ity of structural components, portions of some of said structural components being disposed inward of the plane defined by the machine-facing side of said reinforcing structure to form raised portionsi (c) applying a first coating of liquid photosensitive resin to at least s~id machine-facing side of said reinforcing structure to at least partially fill the void areas of said reinforcing structure;
(d) bringing at least a portion of said machine-facing side of said reinforcing structure into contact with said working surface of said forming unit;
(e) applying a second coat~ng of liquid photosensitive resin to said paper-facing side of said reinforcing structure so that said first coatlng together with said second coating forms a single coating which has a first surface and a second surf~ce and said coating substantially fills the void areas of the reinforcing structure, said co~ting being distributed so that at least a portion of said second surface of said coatlng is positioned ad~acent said work~ng surface of said forming unit, and said paper-facing side of said reinforcing structure is B

~08~999 14k positioned between said first and second surfaces of said coating, wherein the portion of said c~ating s positioned between said first surface of said coating and the paper-facing side of said reinforcing structure forms a resinous ov~; ~u. d...;
(f) controlling the thickness of said overburden to a preselected value;
(g) pressing said machine-facing side of said reinforcing structure into said deformable, constant volume, working surface by tensioning said reinforcing structure so that forces are exerted by said reinforcing structure in directions normal to the working surface of said forming unit which press said machine-facing side of said reinforcing structure into said working surface causing portions of the working surface of the forming unit to deform and form protrusionS both between the p~ane defined by the machine-facing side of the reinforcing structure and some of said raised portions of said structural components and in some of said interstices, so that said protrusions force portions of said coating along said second surface toward said raised portions thereby excluding portions of said coating from some of the spaces which l ie between the plane defined by the machine-facing side of said reinforcing structure and said raised portions and also from at least some portions of said interstices to form e%cluded areas in said second surface of said coating which are defined by said protrusions;
(h) providing a mask having opaque and transparent regions, sa~d opaque regions together with said transparent region~ defining a preselected pattern in said mask;
B, -l l 2~8~3g9 14c (i) positioning said mask between said coating of liquid photosensitive resin and an actinic light source so that said mask is in contacting relation with said first surface of said coating, said opaque regions of satd mask shielding a portton of said coating from the l ight rays of said l ight source, and said transparent regions leaving other portions of said coating unshielded;
(j) curing said unshielded portions of liquid photosensitive resin and leaving said shielded portions uncured by exposing said coating of liquid photosensitive resin to light having an activating wavelength through said mask to form a partially-formed composite belt; and, (k) removing substantially all uncured liquid photosensitive resin from said partially-formed composite belt to leave a hardened resin f, 'Or k around at least a portion of said reinforcing structure, which framework has a plurality of conduits in those regions which were sh~elded from l ight rays by the opaque regions of the mask and passagew~ys which provide surface texture irregularities in the backside network of said framework ~n those portions of said second surface of said resinous coating which were defined by the protrusions in said working surface.

.

B!

14d BRIEF ~ESCRTPTrON Of THE DRAWI~IGS
FIG. 1 is ~ schematic represent~tion of one embodiment of a continuous pap~rm~king m~chine useful in carrring out the process of this invention.
FIG. IA is a simplified schem~tic representation of a cross-section which shows the parti~lly-formed embryonic web cf paperm~king flbers prior to its deflection into ~ conduit of the p~perm~king b~lt of the present invention.
FIG. 18 is a simplified representation in cross-section of the portion of the embryonic web shown in FIG. lA after the fibers of the embryonic web h~ve been deflected into one of the conduits of the p~perm~king belt.
FIG. 2 is a pl~n view of ~ portion of the preferred embodiment of the improved papermaking belt of the present i nvent i on .
FIG. 3 is an enlarged cross-sectional view of the portion of the paperm~king belt shown in FIG. 2 as taken along line 3 - 3.

B

Wo 92/00416 PCI/US911D42~8 15 2jQ~999 FIG. 4 is an enlarged cross-sectional view of the portion of the papermaking belt shown in FIG. 2 as taken ~long line 4 - 4.
FIG. 5 is a plan view of a portion of an alternative embodiment of the papermaking belt of the present invention which S has a monolayer reinforcing structure.
FI6. 5A is a cross-sectional view of the portion of the papermaking belt shown in FIG. 5 as taken along line 5A - 5A.
FIG. 58 is a cross-sectional view of the portion of the papermaking belt shown in FIG. 5 as taken along line 5B - 5B.
FIG. 6 is an enlarged plan view of a preferred woven mult~layer reinforcing structure which can be used in the papermaking belt of the present invention.
F16. 7 is an extended sectional view of the reinforcing structure shown in FIG. 6, taken along line 7 - 7 of FIG. 6.
FIG. 8 is an extended sectional view of the reinforcing structure of FIG. 6 taken along line 8 - 8 of FIG. 6.
FI6. 9 is an extended sectional view of the reinforcing structure of FIG. 6 taken along l~ne 9 - 9 of FIG. 6.
FIG. lO is an extended sectional view of the reinforcing structure of FIG. 6 taken along line 10 - 10 of FIG. 6.
FIG. 11 is an extended sectional view of the reinforcing structure of FIG. 6 taken along line 11 - 11 of FIG. 6.
FIG. 12 is a plan view of a portion of the reinforcing structure shown with part of the surrounding framework in place around the reinforcing structure.

O 92/00416 PCI/I~S91~04258 9l9~ FIG. 12A is an end view of the portion of the reinforcing structure of FIG. 12 which illustrates the position of some passageways and surface texture irregularities relative to several of the projected areas of the reinforcing structure.
FIG. 13 is a plan view of the reinforcing structure, similar to FIG. 6, which illustrates the projected reinforcing area of a portion of the reinforcing structure.
FIG. li is another plan view of the reinforcing structure, similar to FIG. 13, which illustrates some of the projected warp areas of the reinforcing structure.
FIG. lS is an end view of the reinforcing structure, similar to FIG. 8, which illustrates the projected warp areas depicted in FIG. 14 from another angle.
FIG. 16 is another plan view of the reinforcing structure, s1milar to FIGS. 13 ind 14 which illustrates some of the projected weft areas of the reinforcing structure.
FIG. 17 is an extended sectional view, similar to FIG. 7, which illustrates the projected weft areas of the depicted in FIG.
16 from another angle.
FIG. 18A is a plan view of the reinforcing structure, similar to the preceding plan views of the same, which illustrates some of the projected knuckle areas of the reinforcing structure.
FIG. 18B is an extended sectional view of the reinforcins structure, similar to FIG. 7, which illustrates some of the 2s projected knuckle areas of the reinforcing structure from another angl e .

WO 92/004t6 PCl-~US9~JD4258 17 2~84999 ~
FIG. 18C is an end view of the reinforcing structure, similar to FIG. 8, which illustrates some of the other projected knuckle areas of the reinforcing structure from another angle.
FIG. 19 is an enlarged schematic representation of one S preferred conduit opening geometry for the papermaking belt of the present invention.
FIGS. 19A and 19B are plan views which show, respectively, the projected first surface knuckle area and the projected second surface knuckle area of the framework of the papermaking belt 0 shown in FIGS. 2 through 4.
FIG. Z0 is an enlarged schematic representation of another ~"~fe~.~.d conduit opening geometry.
FIG. 21 is a greatly enlarged and exaggerated schematic sectional view of a portion of the framework and reinforcing L5 structure of a papermaking belt which shows the details of the p-cs73~ ays and surface texture irregularities on the backside of the same.

FIGS. 22A, B, and C are simpl ~fied schemat7c representations of different types of the backside surface texturing which can be found on a papermaking belt.
FIG. 22D is a greatly enlarged view of a portion of a reinforcing component, similar to the reinforcing component shown in FIGS. 22A-C, which shows some of the raised portions of the reinforcing component.
25 FlG. 23A is an ènlarged schematic representation of the problems wh~ch occurred when a papermaking belt without the : o.. ts disclosed herein encountered the vacuum dewatering equipment during the papermaking process.

WO 92/00416 ~Cr/US91~04258 2084~99 FIG. 23B is an enlarged schematic representation of the manner in which the papermaking belt of the present invention alleviates the problems encountered previously.
FIG. 24 is a graphical representation which depicts the S application of vacuum pressure to a papermaking belt both with and without the backside texture disclosed herein.
FIG. 25 is a schematic representation of the basic apparatus for making the papermaking belt of the present invention.
FIG. 26 is an enlarged schematic representation of the post-cure unit of the apparatus shown in FIG. 2S.
FIG. 27 is an enlarged schematlc representation of an alternative forming unit used in the process of making the papermaking belt of the present invention which comprises a deformable casting surface and a conformable barrier film.
FIG. 28 is a schematic representat10n of the forming unit in FIG. 27 which has been further enlarged to show in detail the manner in which the backside texturing is formed during the casting process.
FIG. 29 is a schematic representation of another alternative of the belt casting process of the present inventlon which employs a n~nd~r~""able casting drum and a deformable barrier film as the casting surface.
FIG. 30 is a schematic representation of the forming unit in FIG. 29 which has been further enlarged to show in detail the manner in which the backside texturing is formed during the casting process.

S91~042~8 WO 92/00416 PCI!` U
19 2~8~999 FIG. 31 is a schematic plan view of a portion of the testing apparatus which is used to measure air leakage across the backside of the papermaking belt of the present invention.
FIG. 32 is a schematic side view of the testing apparatus shown fn FIG.-31.
flG. 33 is a graphical representation of the calibration of the flow meter used in the apparatus shown in preceding two figures .
FIG. 34A is a plan view photograph, enlarged about 25 times actual size, of the top side of a papermaking belt which does not contain the i .,ù.. -ts disclosed herein.
FIG. 34B is a plan view photograph, enlarged about 25 times actual size, of the backside of a papermaking belt which does not contain the i ,u.. ts disclosed herein.
FIG. 35A is a photograph, enlarged about 25 times, of the top side of a papermaking belt made in accordance with the method of the present invent~on. The photograph was taken at an angle of approximately 35 degrees relative to an imaginary line drawn normal to the surface of the top side.
FIG. 35B is a photograph, enlarged about 25 times, of the backside of the papermaking belt shown in FIG. 35A. The photograph was taken at an angle of approximately 35 degrees relative to an imaginary line drawn normal to the surface of the backs ide .
FIG. 35C ~s a sectional view photograph of the papermaking belt shown in F~GS. 35A and 35B taken looking in the machine direction, and enlarged about 25 times actual size.
QETAILED DESCRIPTION OF THE IHVENTION

WO 92/004t6 ~'CI/US91/0425g ~ ~ 20 ,4g99 - The speciftcation contains the following, in order: a detailed description of the papermaking belt of the present invention; one basic method of making this papermaking belt and several variations of the same; and a detailed description of the process for making paper according to the present invention.
I. The P~n~rmakinq Belt In the representative papermaking machine illustrated in FIG.
I, the papermaking belt of the present invention takes the form of an endless belt, papermaking belt lO. In FIG. 1, the papermaking belt 10 carries a paper web (or "fiber web") in various stages of jts formation and travels in the direction indicated by directional arrow B around the papermaking belt return rolls l9a and l9b, impression nip roll 20, papermaking belt return rolls 19c, 19d, I9e and l9f, and emulsion distributing roll 21. The loop the papermaking belt I0 travels around includes a means for applying a fluid pressure differential to the paper web, such as vacuum pickup shoe 24a and multislot vacuum box 24. In FIG. 1, the papermaking belt also travels around a predryer such as blow-through dryer Z6, and passes between a nip formed by the impression nip roll 20 and a Yankee dryer drum 28.
, Although the preferred embodiment of the present invention is in the form of an endless belt, the present invention can be incorporated into numerous other forms which include, for instance, stat10nary plates for use in making handsheets or rotating drums for use with other types of continuous processes.
Regardless of the physical form which the papermaking belt 10 takes, it generally has certain physical characteristics.
The overall characteristics of the papermaking belt 10 of the present invention are shown in FIGS. 2-4. The papermaking belt 3c (or simply the "belt'') 10 of the present invention is generally comprised of two primary elements: a framework 32 (preferably, a hardened pol ymeri c photosens i t i ve res i n framework) and a wo 92/00416 PCI`/US91/042~8 Zl reinforcing structure 33. When the papermaking belt 10 is an endless belt, it generally has two opposed surfaces which are referred to herein as the paper-contacting side 11 and the textured backside, or simply, the backside 12. The backside lZ of the belt 10 contacts the machinery employed in the papermaking operation, such as vacuum pickup shoe Z4a and multislot Yacuum box Z4. The framework 3Z has a first surface 34, a second surface 35 opposite the first surface 34, and conduits 36 extending between the first surface 34 and the second surface 35. The first surface 34 of the framework 3Z contacts the fiber webs to be dewatered, and defines the paper-contacting side 11 of the belt. The conduits 36 extending between the first surface 34 and the second surface 35 channel water from the fiber webs which rest on the first surface 34 to the second surface 35 and provide areas into which the fibers of the fiber web can be deflected and rearranged.
FIG. Z shows that the network 3Za comprises the solid portion of the framework 3Z which surrounds the conduits 36 defines a net-l ike pattern. As shown in FI6. 2, the openings 42 of the conduits 36 are arranged in a preselected pattern in the network 32a. FI6. Z shows that the first surface 34 of the framework 3Z
has a paper side network 34a formed therein which surrounds and defines the openings 42 of the conduits 36 in the first surface 34 of the framework 32. As will be s~hs-~ tly shown in FI6. 35B, the second surface 35 of the framework 32 has a backside network 35a which surrounds and defines the openings 43 of the conduits 36 in the second surface 35 of the framework 32. FI6S. 3 and 4 show that the reinforcing structure 33 of the papermaking belt 10 of the present invention, in general, is at least partially su" . i~' by and enveloped (or embedded, or encased~ in the framework 32. More specifically, the reinforcing structure 33 is positioned between the first surface 34 of the framework 32 and at least a portion of the second surface 35 of the framework 3Z.
FIGS. 3 and 4 also show that the reinforcing structure 33 has a paper-facing side 51 and a machine-facing side 52. opposite the paper-facing side 51. As shown in FI6. Z, the reinforcing structure 33 has interstices 39 and a reinforcing component 40.

~22 _, .
208499~ The reinforcing component 40 comprises the portions of the - reinforcing structure exclusive of the interstices 39 (that is, the sol id portion of the reinforcing structure 33) . The reinforcing component 40 is generally comprised of a plurality of structural components 40a. The reinforcing structure 33 has a projected open area defined by the projection of the areas defined by the interstices 39, and a projected reinforcing area defined by the projection of the reinforcing component 40. FIGS. 3 and 4 show that the second surface 35 of the framework 32 has a backside 0 network 35a with a plurality of passageways 37 that provide surface texture irregularities 38 in the backside network 35a of the framework 32. The passageways 37 are distinct from the conduits 36 which extend between the first surface 34 and second surface 35 of the framework 32. The p~S~ Lys 37 allow air to enter between the backside surface 12 of the papermaking belt 10 and the surfaces of the.vacuum dewatering equipment employed in the papermaking process (such as Yacuum pickup shoe 24a and vacuum box 24) when a vacuum is applied by the dewatering equipment to the backside 12 of the belt to deflect the fibers into the conduits 36 of the belt 10. The surface texture irregularities 38 provide an uneven surfaçe for contacting the machinery employed in the papermaking operation.
. . , The paper-contacting s1de 11 of the belt 10 shown in FIGS.
1-4 is the surface of the papermaking belt I0 which contacts the paper web which is to be dewatered and rearranged into the finished product. As shown in FIG. 1, the side of the belt 10 referred to as the paper-contacting side 11 is referred to as such even though it only carries a paper web for a portion of each revolution in the papermaking machine. The side of the belt 10 referred to dS the paper-contacting side 11 is also consistently referred to as such even though during a portion of each revolution (such as adjacent papermaking belt return roll 19d), it may briefly come in contact with the machinery employed in the papermaking process. The paper-contacting side 11 of the belt 10 may also be referred to as the "top surface~ or the "embryonic -I~S91JD42~8 WO 92/004t6 PCI/

we~-contacting surface" of the belt 10. It is to be understood that although the paper-contacting side 11 of the belt 10 may be referred to as the top surface, the orientation of the paper-contacting side 11 may be such that it is facing downwardly on the return path in a papermaking machine when the belt 10 is in the configuration of an endless belt. As shown in FIG5. 2-4, the paper-contacting side 11 of the belt 10 is generally formed entirely by the first surface 34 of the framework 32.
As shown in FIG. 1, the opposed surface of the belt 10, the backside 12, is the surface which travels oYer and is generally in contact with the papermaki~g machinery employed in the papermaking process, such as the papermaking belt return rolls 19a-19c and 19e and 19f and the vacuum pickup shoe 24a and vacuum box 24, as well as other vacuum dewatering equipment not illustrated in the drawings. FIG. 1 shows that the side of the belt 10 referred to as the backside 12 is referred to as such even though it may occas70nally face away from the machlnery employed in the papermaking process (such as adjacent papermaking belt return roll 19d). The backside 12, however, can be distinguished from the paper-contacting side 11 because the backside 12 never contacts a paper web during the papermaking process. The backside 12 of the papermaking belt 10 of the present lnvention may also be referred to herein as the "bottom surface~ of the belt. It may also be referred to as the "wear surface" of the belt because it ~s the surface of the belt which is subjected to the abrasive action of being repeatedly traveled over the papermaking machinery during the papermaking process. It is to be understood that although the backside 12 of the bel t 10 may be referred to as the bottom surface, the orientation of the backside 12 may be such that ~t is facing upward or the return path in a papermaking machine when the belt 10 is in the configuration of an endless belt. As a general matter, the backside 12 of a belt which comprises a framework and a reinforcing structure may be formed entirely by the backside network 35a of the second surface 35 of the framework 32, although such an . ~ i t may not occur often in the papermaking belt 10 , . S
2084993 of the present invention. Alternative1y, the backside 12 may be-formed entirely by the machine-facing side 52 of the reinforcing structure 33; or, it may be formed partially by the backs1de network 35a of the framework 32 and parti~lly by the S machine-facing side 52 of the reinforcing structure 33. It ~s this bottom surface or backside 12 and the methods of creating passageways and surface texture irregularities in the same which are of primary importance in this invention.
The reinforcing structure 33, one of the primary elements of io the papermaking belt 10 of the present invention, is shown in FIGS. 2-4. The reinfo,rcing structure 33 strengthens the resin framework 32 and has suitable projected open area to allow the vacuum dewatering machinery employed in the papermaking process to adequately perform its function of removing water from partlally-formed webs of paper, and to permit water removed from the paper web to pass through the papermaki ng bel t 10 . The reinforcing structure 33 can take any number of different forms.
The reinforcing structure 33 can comprise a woven element (also somet~mes referred to herein as a woven ~fabricn), a nonwoven element, a screen, a net (for instance, thermoplastic netting), a scrim, or a band or plate (made of metal or plastic or other sui tabl e materi al ) wi th a pl ural i ty of hol es punched or dri 11 ed i n it provided the reinforcing structure 33 adequately reinforces the framework 32 and has sufficient projected open area for the purposes spec~fied above. Preferably, the reinforcing structure 33 comprises a woven element (or more particularly, a foraminous woven element) such as that shown in FIGS. 2-4.
Generally, as shown in FIGS. 2-4, the reinforcing structure 33 comprises a reinforcing component 40 and a plurality of 3u interstices (or "fine foramina") 39. The reinforcing component 40 1s the portion of the reinforcing structure 33 exclusive of the interstices 39. In other words, the reinforcing component 40 is the solid portion of the reinforcing structure 33. The reinforcing component 40 is comprised of one or more structural ~42s8 wo 92/00416 ~cr/uss 208~999 components 40a. As used herein, the term ~structural componentsn refers to the individual structural elements that comprise the reinforcing structure 33.
The interstices 39 allow fluids (such as water removed from the paper web) to pass through the belt 10. The interstices 39 form one of the groups of openings in the papermaking belt 10.
fIG. 2 shows that the interstices 39 may form a pattern in the reinforcing structure 33. The pattern formed by the interstices 39, however, is to be contrasted with the preselected pattern o formed by the conduit openings, such as first conduit openings 42.
FIG. 2 shows that typically, each interstice 39 is only a fraction of the size of a conduit opening 42, but the alternate relationship is possible.
As shown in FIGS. 3 and 4, the reinforcing structure 33 has two sides. These are the paper-facing side (or the "paper support side"~, generally designated 51, which faces the fiber webs to be dewatered, and the machine-facing side (or "roller contact side~) generally designated 52, oppos~te the paper-facing side, which faces the machinery employed in the papermaking operation. The sides of the reinforcing structure 33 referred to as the paper-facing side 51 and the machine-facing side 52 are referred to as such even though there may be brief portions of each revolution of the papermaking belt 10 when they face in the opposite direction. In addition, the respective sides of the reinforcing structure 33 are consistently referred to by these names even prior to the incorporation of the reinforcing structure 33 into the papermaking belt 10 of the present invention and the installation of the belt 10 in a papermaking machine. Thus, the side of the reinforcing structure 33 referred to as the machine-facing side 52 in the method of making the papermaking belt 10 of the present invention will be that side which generally faces the papermaking machinery when the finished belt is installed in a papermaking machine. The paper-facing side 51 wil1 always be opposite the machine-facing side 52. As shown in FIGS.

21)84g99 3 nd 4, the reinforcing structure 33 is positioned between the first surface 34 of the framework 32 and at least a portion of the second surface 35 of the framework 32.
FIGS. 2-4 show that when the reinforcing structure 33 comprises a woven element, the indtvidual yarns which are woven together to form the woven element comprise the structural components 40a of the reinforcing structure 33. rf the reinforcing structure 33 comprised a nonwoven element, the tndivtdua~ fibers forming the nonwoven element would comprise the o structural components 40a. In both cases, there will be a plurality of structural components such that all of these structural components 40a will together comprise the reinforcing component 40. If, on the other hand, the reinforcing structure 33 ts a plate with a plurality of holes punched in it, there wil1 be only one structural component 40a (the plate), and thts will comprise the retnforcing component 40.
The structural components 40a of a woven reinforcing structure comprise yarns, strands, filaments, or threads. It is to be understood that the terms yarns, strands, ftlaments, and threads are s~n~.~yr )u~ when used to describe the structural components 40a of a woven reinforcing structure. It is also to be understood that the above terms (yarns, strands, etc . ) coul d comprise not only monofilament elements, but also multifilament el ements .
When the reinforcing structure 33 comprises a woven element, as shown in FIGS. 2 - 4, some of the individual structural components 40a comprise machtne-direction warp yarns, generally designated 53, ~nd some comprise cross-machine direct~on weft yarns, generally designated 54. As used herein, the terms nmachine-directton warp~, "warp", and "load-bearing warp" are s~"ull~ - and refer to yarns which are generally oriented in the mach~ne dtrect~on when the papermaking be1t I0 of the present tnvention is installed in a papermaking machine. As used herein, WO 92/00416 PCT/US91~04258 the terms "cross-machine direction weft", "weft", "shuten, and-awarp balancing weft" are synonymous and refer to yarns which are generally oriented in the cross-machine direction when the papermaking belt 10 of the present inYention is installed in a papermaking machine.
In papermaking, the term "machine direction" (MD) refers to that direction which is parallel to the flow of the paper web through the equipment. The "cross-machine direction" (CD) is perpendicular to the machine direction. These directions are indicated by arrows in FIG. 2 and in seYeral of the figures which follow.
The definitions of warp yarns and weft yarns used herein may sometimes differ from the definitions of those terms when describing the orientation of the yarns of a woven fabric when it is being woYen in a loom. In the weaYing art, whether a yarn is referred to as a warp or a weft depends in part upon whether the fabric is an endless woYen fabric that does not haYe to be seamed into a loop to form an endless belt, or whether it is a flat woYen fabric which must be seamed into a loop to form an endless belt.
For an endless woYen fabric that need not be seamed into a loop, the threads which are referred to as warps in the loom will extend crosswise in a papermaking machine. On the other hand, if a fabric is woYen flat, and then seamed into a loop, the threads which are referred to as warp threads in the loom will extend in the machine direction in a papermaking machine. As used herein, the terms "warp yarns" and "weft yarns~ refer to the orientation of the yarns when the fabric is in place on a papermaking machine, rather than while it is being woYen in a loom. Thus, "warp yarns~
means machine-direction warp yarns, and "weft yarns" means cross-machine direction weft yarns when the papermaking belt of the present inYention is installed on a papermaking machine.
FIG5. 2-4 also show that in a woYen reinforcing structure 33, some of the yarns will cro~s to form knuckles 105 in the fabric.

WO 92/00416 PCI/US91/042~8 J`- 28 1208499~
As used herein a "knuckle" is either a portion of a weft yarn that passes over a warp yarn or a portion of a warp yarn that passes oYer a weft yarn which lies in the plane of one of the surfaces (that is, elther the paper-facing side 51, or the machine-facing s side 52) of the reinforcing structure 33. Knuckles which lie in the paper-facing side 51 of the reinforcing structure 33 (or "paper side knuckles") are designated 1051. Knuck1es which lie in the machine-facing side 52 (or "backside knucklesn) are designated 1052. These knuckles 105 may be further classified herein and referred to as either "warp knuckles", or "weft knuckles".
As used herein, the term "warp knuckles" will refer to the knuckles formed by a portion of a warp yarn that passes over a weft yarn. Several such warp knuckles are designated 105a in the alternative embodiment of the papermaking belt 10 of the present invention shown in FIG. 5 (which includes a monolayer reinforcing structure 33). As shown in cross-section in FIG. SB, the warp knuckles 105a can lie either in the paper-facing side 51 or in the machine-facing side 52 of the reinforcing structure 33. Warp knuckles which lie in the paper-facing side 51 of the reinforcing structure 33 are designated 105al, and warp knuckles which lie in the machine-facing side 52 are designated 105a2.
The knuckles formed by a portion of a weft yarn that passes over a warp yarn are referred to herein as ~weft knucklesn.
Several such weft knuckles are shown as 105b ~n FlGS. 2 and 3.
FIG. 3 shows that the weft knuckles, like the warp knuckles, can either lie ln the paper-facing side 51 of the reinforcing structure 33, such as weft knuckle 105bl, or they can lie in the machine-facing side 52 of the reinforcing structure 33, such as weft knuckle 105b2.
Many types of woven elements are suitable for use as a reinforcing structure 33 in the papermaking belt 10 of the present invention. Suitable woven elements include foraminous monolayer woven elements (having a single set of strands running in each ~

WO 92/004~6 PCI~US91/04Z58 29 20849g9 direction and a plural ity of openings therebetween) such as the reinforcing structure 33 shown in FIGS. 5, 5A, and SB, multilayer woYen elements (woven fabrics having more than one set of strands running in at least one direction), and fabrics with several layers each of which comprises interwoven strands.
Multilayer woven fabrics are preferred as reinforcing s~r~ tl..eS because they can extend the useful life of the composite papermaking belt. As used herein, the term "composite papermaking belt" refers to a belt which is comprised of a lo framework and a reinforcing structure. The papermaking belt 10 comes under considerable stress in the machine direction due to the repeated travel of the belt 10 over the papermaking machinery in the machine direction and also due to the heat transferred to the belt by the drying mechanisms employed in the papermaking process. Such heat and stress give the papermaking belt a tendency to stretch. If the papermaking belt 10 should stretch out of shape, its ability to serve its intended function of carrying a paper web through the papermaking process becomes dimin~shed to the point of uselessness.
To be suitable for use as a reinforcing structure in the papermaking belt of the present invention, a multilayer woven element preferably has some type of structure which provides for reinfo~, t of its machine direction yarns 53 in order to reduce the aforementioned stretching problem. In other words, the mul t i 1 ayer fabri c must have i ncreased fabri c stab i 1 i ty i n the machine-direction. The ar.~n, ~ of the warp yarns 53 should be such that any additional reinfo~ ~ of the warp yarns does not reduce the projected open area of the reinforcing structure 33.
As used herein, the term "projected area" means the area formed by projecting the points which define the element in issue into a plane. More particularly, it is to be understood that these points will be projected in a direction which will be referred to as the "z-direction~. The projected open area of the WO 92/00416 ~CI'/US91~04258 . ~ ~
o~4999 reinforcing structure is shown as Ao in FIG. 12 of the accompanying drawings. As used herein, the term "projected open area" refers to the projected area defined by the projection in the z-direction of all the areas defined by the interstices 39 of the reinforcing structure 33. In other words, the projected open area Ao of the reinforcing structure 33 is that area seen when the reinforcing structure 33 is viewed from a direction perpendicular to either side of the reinforcing structure 33 through the interstices 39 which provide direct lines of sight through the fabriC.
~, ' Throughout this description, references will be made to the x, y, and z directions. As used herein, the x, y, and z direct~ons are orientations relating to the papermaking belt of the present invention (or portions thereof) in a Cartesian coordinate system. In the Cartesian coordinate system described herein, the backside 12 of the belt lies in the plane formed by the x and y axes. The x axis is the cross-machine direction, the y axis is the machine direction, and the z axis is perpendicular to the plane defined by the x and y axes. As used herein, the "z-direction" refers to those orientations which run parallel to the z axis and perpendicular to the x and y axes. These directions are best shown in FIGS. 2-4.
.
The projected open area of the reinforcing structure 33 should preferably be such that the reinforcing structure 33 is highly permeable (to fluids such as air and water). By "highly permeable" it is meant that the reinforcing structure 33 should have an air permeability in the range of about 800 cfm to about 1,400 cfm per ft2 of its surface at a pressure differential of 100 pascals. The air permeability of the reinforcing structure 33 is of primary importance because it contributes with the framework to establish an air permeability for the composite belt. The composite belt should haYe an air permeability in the range of about 300 cfm to about 600 cfm. The preferred air permeabil ity for the composite belt s about 500 cfm. In ~-o~r ~or bo h the PC~US91~042~8 31 208~99~
reinforcing structure 33 and composite belt to be sufficiently permeable, it is preferable that the projected open area Ao of the reinforcing structure 33 not be reduced below about 30X, and most preferably that the projected open area not be reduced below about 40% to about 50%.
As shown in FIGS. 2-4, a preferred reinforcing structure 33 is a multilayer woYen element that has a single layer yarn system with yarns which extend in a first direction and a multiple layer yarn system with yarns which extend in a second direction which is normal to the first direction. In the preferred reinforcing structure 33 shown in FIGS. 2 - 4, the first direction is the cross-machine direction. The single layer of yarns which extend in the first direction comprise the weft yarns 54. In the reinforcing structure 33 shown in FIGS. 2-4, the multiple layer yarn system extends in the machine direction (that is, the direction the fabric travels on a papermaking machine). The multiple layer yarn System comprises a first warp layer C, and a second warp layer D. Each of the warp layers C and D comprises a plurality of warp yarns 53. Although the most preferred fabrics for use as a reinforcing structure have multiple machine direction warp yarns, the present invention can also be practiced using a fabric which has multiple strands in the cross-machine direction.
Fabrics having multiple machine direction warp yarns are preferred, however, because the additional strands run in the direction which is generally subject to the greatest stresses.
As shown in FIG. 3, the preferred multilayer reinforcing structure 33 has warp yarns 53 which are vertically stacked directly on top of one another. The vertically-stacked warp yarns 53 provide increased stability for the composite belt 10 in the machine or process direction. The stacked a~,ans t of the warp yarns also provides suitable projected open area so the belt 10 can be used in a variety of types of papermaking processes, including blow-through drying papermaking processes. The weft yarns 54 are preferably arranged in such a manner that they WO 92/00416 PCr/US91/04 maintain and stabilize the warp yarns 53 in a vertically-stacked al, .5 t. The weft yarns 54 may also be vertically stacked, or they may be in some other relationship. Numerous variattons of such arrangements are possible.
FIGS. 6 through 11 show the details of the weave pattern of the particular preferred multilayer reinforcing structure 33 shown in FIGS. Z-4. As used herein, the term "weave pattern" means the technical design of a weave. The multilayer fabric is shown in FIGS. 6 through 11 without the surrounding framework for clarity of illustration. Although the same fabric is shown in FIGS. 2-4 as a composite element in a papermaking belt (that is, as a reinforcing structure for reinforcing the framework 32 of the papermaking belt 10 of the present invention), the fabric shown is also suitable for use by itself as a papermaking belt without such a framework. However, the multilayer fabric described herein is preferably used in conjunction with a framework of some type.
Generally, as shown in FIGS. 6 through 11, the first warp layer C of warp yarns 53 extend in the machine direction on the paper-facing side 51 of the fabric. The individual warp yarns in the first warp layer C are numbered repeatedly across the fabric as 53a, 53b, 53c, and 53d. The second layer D of warp yarns 53 extend in the machine direction on the machine-facing side 52 of the fabric. The individual warp yarns in the second warp layer D
are numbered repeatedly across the fabric as 53e, 53f, 53g, and 53h. As best shown in FIGS. 8 - 11, the individual yarns in the first warp layer C and the second warp layer D define stacked warp yarn pairs E, F, G, and H. The individual yarns which define the stacked warp yarn pairs E, F, G, and H are arranged in a generally vert~cally-stacked ~r ~,os~d position one over the other. These 3d stacked warp yarn pairs, E, F, G, and H, are also repeatedly numbered across the fabric. FIGS. 8-11 show that the individual warp yarns 53a and 53e define stacked warp yarn pa~r E; warp yarns 53b and 53f define stacked warp yarn pair F; warp yarns 53c and S~ defin~ stacke warp y~ pair G; and, ~arp yar~ ~.d a~d 53h 33 298~;9;99 define stacked warp pair H. As shown in FIG. 6 and in FIGS. 8-11, the adjacent stacked warp yarn pairs are spaced apart in the cross-machine direction to proYide the desired fabric open area.
As shown in FIG. 6, since the warp yarns 53 are stacked on top of one another, the effective density of the warps yarns 53 (or "thread density" of the warp yarns) is doubled without decreasing the open area of the reinforcing structure 33. As used herein, the term "thread density" refers to a measurement which equals the product of the number of threads per unit width of the fabric (which unit of width generally used is an inch) and the thread diameter (which is also generally measured in inches). The term "thread density" can more particularly be expressed for the warp yarns of a fabric (i.e., the warp thread density) or the weft yarns of a fabric (i.e., the weft thread density).
A weft yarn, such as weft yarn 54a in FIG. 8, 54b in FIG. 9, 54c in FIG. 10, and 54d in FIG. 11 is interwoven with the warp yarns 53a-h in the first and second warp layers. The weft yarns bind the indiYidual warp yarns in the first and second warp yarn layers in stacked pairs and prevent the warp yarns 53a-h from shifting laterally so as to reduce the open area of the fabric.
These weft yarns 54a, 54b, 54c, and 54d are also numbered repeatedly across the fabric. The weft yarns 54 are interwoven in a specific weave pattern (or more particularly, a "warp balancing weave pattern") with the stacked pairs of the warp yarns. The weft yarns 54 maintain the warp yarns stacked upon one another and in general vertical alignment.
The particular weave pattern of the warp yarns 53 and the weft yarns 54 in the fabric shown in FIGS. 6 through 11, is known as a four-shed repeat pattern. As used herein, the term "shed"
refers to the number of unique configurations either a warp yarn or a weft yarn forms with the threads with which it is interwoven before a repeat occurs (i.e., a four-shed pattern would be a pattern which repeats a~ter every group of four threads).

208 The specific pattern of weaving the warp yarns 53 is shown best in FIGS. 6 and 7. As shown in FIGS. 6 and 7, the first warp yarns of the first warp layer C (such as warp yarn 53b shown in FIG. 7) repeatedly pass over three and under one of the picks of the weft yarns in the weave pattern. As used herein, the term "pick" refers to inserting a weft yarn between divided warp yarns.
The second warp yarns of the second warp layer D (such as warp yarn 53f shown in FIG. 71 repeatedly pass over one and under three of the picks of the weft yarns in the weave pattern.
The specific pattern of weaving the weft yarns 54 is shown best in FIGS. 6 and 8 -~ i1. As shown in FIGS. 8 - 11, the warp yarns 53 are maintained in vertically-stacked relationship by a weft system which consists of a single network of weft yarns 54 woYen between the stacked warp yarns. The weft yarns 54 are woven around the stacked warps in a repeating pattern in which a weft yarn (such as weft yarn 54a in FIG. 8) first passes over the first stacked pair of warp yarns E, between the warp yarns of the second stacked pair F, under the third stacked pair G, and between the warp yarns of the fourth stacked pair H. In other words, each weft yarn 54 passes over and under every other pair of stacked warp yarns and between the warp yarns of the intermediate stacked pairs disposed between every other stacked pair.
As shown in FIG. 6 and in FIGS. 8-11, the neighboring weft yarns are woven around the warp yarns 53 i n the same manner .
However, as shown in FIG. 9, the adjacent weft yarns, such as weft yarn 54b, is displaced a pair of warps from that of the first weft yarn. Thus, the adjacent or second weft yarn passes: between the warp yarns of the first stacked pair, over the second stacked pair of warp yarns, between the warp yarns of the th~rd stacked pair, and under the fourth stacked pair of warp yarns. As shown in FIGS. 10 and 11 respectively, the third weft yarn 54c is similarly displaced one pair of warp yarns from the second, and the fourth weft yarns 54d is displaced one pair of warp yarns from the third 54c. This pattern repeats every foureh weft yarn. As shown in WO 9~/00416 PCr/US91JV4258 2a849~9,9,,~", . .
FIG. 6, this produces a weave pattern in which the cross-over points 55 formed by the weft yarns 54 are staggered in the weft direction across the warp yarns.
A variation of the preceding weave pattern can be achieved by interchanging weft yarn 54c shown in FIG. 10 with weft yarn 54d shown in FIG. 11. This results in a broken, staggered pattern of cross-over points SS of the weave in the weft direction. In this broken pattern, the first two cross-over points SS are in a straight diagonal line. The third cross-over point SS, howeYer, o is shifted over a third warp yarn to a fourth warp yarn and the fourth cross-over point SS shifted over a third warp yarn to a fourth warp yarn and then the cross-over point SS is shifted back in a diagonal to the third warp yarn. This weave pattern also maintains the warp yarns in stacked pairs in a suitable configuration. However, in this variation of the weave pattern, the two warp yarns pass together between two adjacent picks. In the first described weave pattern, there are no two picks between which the warp yarns simultaneously pass, which provides a slightly better balance in the weave pattern.
Various combinations of materials, cross-sectional dimensions, ind cross-sectional shapes of yarns may be utilized in this preferred fabric. The yarn material, cross-sectional di~ensions, and the cross-sectional shapes of the yarns will be determined by the particular application being made of the fabric.
~5 While the specific materials of construction of the warp yarns and weft yarns can vary, the material comprising the yarns should be such that the yarns will be capable of reinforcing the resinous framework and sustaining stresses as well as repeated heating and cooling without excessive stretching. Suitable materials from which the yarns can be constructed include, polyester, polyamid, high heat resistant materials such as KELVAR
or NOMEX brands, and any other materials which are known for use in papermaking fabrics. The preferred material for the y~rns, WO 92/00416 PCI/US91~04258 20849~- 36 however, is polyester. The material of construction of the yarns in the different layers and yarn systems can vary with the yarns in one layer or yarn system being constructed of one material and the yarns of the other layers or yarn systems being constructed of a different material. Preferably, however, all of the yarns in the di fferent 1 ayers and yarn systems are constructed of essentially the same material.
Any convenient cross-sectional dimensions (or slze) of the yarns can be used as long as the flow of air and water through the lo conduits 36 is not significantly hampered during ~he paper web processing and as long as the integrity of the papermaking belt 10 as a whole is maintained. Yarns having the same cross-sectional dimensions can be used in all of the layers or yarn systems, or the size of the yarns in the different layers and yarn systems can 1~ vary. for example, if yarns having a round cross-sectional are used, the yarns of warp systems C and D may be of one diameter, and the yarns of weft system may be of a larger or smaller diameter. If larger diameter weft yarns are used, the weft yarns will be stiffer and place more crimp in the warp yarns. Other variations include those in which the yarns of the warp system C
and the weft system 54 are identical, and the yarns of the warp system D are different. Likewise, the yarns of the warp system D
and the yarns of the weft system may be identical, and the yarns of the warp system C different. Alternatively, the yarns in each of the warp system C, warp system D, and the weft system can be different. For yarns having round cross-sections, a preferred range of yarn dlameters is from about 0.10 mm to about 0.30 mm.
The most preferred diameters are about 0.22 mm for the warp yarns 53 and about 0.28 mm for the weft yarns 54. Depending on the application, larger diameter yarns may also be used.
.
Yarns of any suitable cross-sectional shape can be used as long as the yarns do not interfere with the flow of fluids through the conduits 36 during web processing and as long as the integrity of the papermaking belt 10 as a whole is maintained. Suitable US91/042~i8 WO 92/00416 PCI~
~ 37 2n8~99 cross - secti ons i ncl ude round , oval, square , and rectangul ar shapes. The cross-sectional shapes of the yarns in the different ~ayers and yarn systems can also Yary between the layers and yarn systems. Preferably, however, both the warp yarns 53 and the weft yarns 54 have round cross-sections.
The reinforcing structure 33 of the present invention defines several projected areas which are useful in describing the location of the passageways 37 and surface texture irregularities 38 in the backside network 35a of the second surface 35 of the framework 32. As shown in FIGS. 12-18, the reinforcing structure 33 defines at least the following projected areas: projected interstitial areas; the previously-defined projected open area (which is the total of all the projected interstitial areas for the reinforcing structure); projected structural component areas;
a projected reinforcing. area (which is the total of all the projected structural component areas for the reinforcing structure); projected warp areas (and an overall projected warp area); projected weft areas (and an overall projected weft areaJ;
projected knuckle areas; and, projected machine side knuckle areas. In addition, when there is more than one layer of warps or wefts, or the like, there may also be projected areas for the warp yarns in the first warp layer and the second warp layer, and so forth .
The projected interstitial areas are shown in FIG. 12 as Apj.
As used herein, the term "projected interstitial areas~ refers to the individual projected areas defined by the projection of the interstices 39 of the reinforcing structure 33. In other words, when the reinforcing structure 33 is viewed from a direction perpendicular to either side of the reinforcing structure 33, each interstice 39 will provide direct lines of sight through the reinforcing structure which constitute the projected interstitial areas Apj.
, ' ~ 38 20~999 The projected structural component area AsC iS shown in FIG.
13. As used herein, the term "projected structural component area" refers to the area defined by the projection of an individual structural component 40a of the reinforcing structure 33. As used herein, the term "projected structural component areas" shall mean the area defined by the projection of more than one, but not al l of the structura~ components 40a of the reinforcing structure 33.
A portion of the projected re~nforcing area AR is shown in lo FIG. 13. As used herein, the term "projected reinforcing area~
shall mean the.ar~a defined by the projection of the reinforcing component 40. As shown in FIGS. 12 and 13, the projected reinforcing area AR is essentially the opposite of the projected open area Ao of the reinforcing component 33, it is the portion of the reinforcing structure 33 which blocks out lines of sight. The projected reinforcing area AR is complementary with the projected open area Ao in that together both comprise the entire projected area of the reinforcing structure 33.
The projected warp areas Awp are shown in FIGS. 14 and 15.
As used herein, the term "projected warp area" Awp refers to the area defined by the projection of the individual warp yarns 53 of the reinforcing structure 33. In FIG. 15, the projected warp areas Awp are shown as the cross-hatched areas which l ie between the dotted lines. These dotted lines could also extend above the p~per-facing side 51 of the reinforcing structure 33. HoweYer, the present invention is generally not concerned with passageways and surface texture irregularities which lie above the plane of the paper-facing side 51 of the reinforcing structure 33.
Therefore, when the position of a paesa3~ ay or surface texture irregularity is being described herein with reference to a projected area, the passageway or irregularity wil~ generally lie between the paper-facing side 51 of the reinforc~ng structure 33 and a plane defined by the backside 12 of the belt 10. When it is said that a passageway or a surface texture irregularity "lies WO 97/00416 PCI~/US91/04258 ~ 208~99 w1thin~ the projected warp areas shown in FIGS. I4 and IS, it can be any place within the areas that are shaded in FIG. 14, or cross-hatched in FIG. IS. In addition to the projected warp area defined by each individual warp, there is an overall projected warp area AWpo which comprises the total for the entire fabric of the individual projected warp areas.
The projected weft areas AWt are shown in FIG5. 16 and 17.
As used herein, the term projected weft area~ AWt refers to the area defined by the projection of the individual wefts 54 of the reinforcing structure 33. In addition to the projected weft area AWt~ there is an overa11 projected weft area" AWto (a portion of wh~ch is shown in FIGS. 16 and 17) which comprises the total of the indiv~dual projected weft areas AWt for the entire reinforcing structure.
As used herein, the term projected knuckle area" of the re~nforcing structure 33 refers to the area defined by the project~on of one of the knuckles IOS of a woven reinforcing structure. As shown in FlGS. 18A - 18C, a projected knuckle area AK iS the port~on of the re~nforc~ng structure 33 where a warp yarn and a weft yarn overlap wh~ch blocks out lines of sight through the reinforcing structure 33. The projected knuckle areas can be further classified as projected warp knuckle areas AKWp (the projected area formed by a warp yarn passing over a weft yarn) or projected weft knuckle areas AKWt (the projected area formed by a weft yarn which passes over a warp yarn). The projected warp knuckle areas AKWp and the projected weft knuckle areas AKWt can be further class~fied as projected paper (or paper-facing) side warp knuckle areas AKWpl or weft knuckle areas AKWtl~ and projected mach~ne-facing (or mach~ne side) warp knuckle areas AKWp2 or weft knuckle areas AKWt2 (depend~ng on wh~ch s~de of the fabric the knuckles are formed).
The other primary element of the papermaking belt I0 of the present invention is the framework 32. The overall WO 92/00416 1~CI/US91/04258 ~lo84999 40 ~
character~stics of the framework 32 are shown in FIGS. 2-4. In the preferred embodiment of the present invention, the framework 32 is formed by manipulating a mass of material, which is generally in liquid form, so that the material, when in solid form, at least partially surrounds the reinforcing structure 33 in such a manner that the reinforcing structure 33 is positioned between the top or the first surface 34 of the framework 32 and at least a portion of the bottom or second surface 35 of the framework 32. In addition, the materia! must be manipulated so that the framework 32 has a plurality of conduits 36 or channels which extend between the first surface 34 and the second surface 35 of the framework 32. The material must also be manipulated so that the first surface has a paper side network 34a formed therein which surrounds and defines the openings of the conduits 36 in the first surface 34 of the framework 32. In addition, the material must be manipulated so that the second surface 35 of the framework 32 has a backside network 35a with paCsage~ 37, distinct from the conduits 36, that provide surface texture irregularit~es 38 in the backside network 35a.
The mass of material which is manipulated to form the framework 32 can be any suitable material, includ~ng thermoplastic resins and photosensitive resins, but the preferred material for use in forming the framework 32 of the present invention is a liquid photosensitive polymeric resin. Likewise, the material chosen can be manipulated in a wide variety of ways to form the desired framework 32, including mechanical punching or drilling, curing the material by exposing it to various temperatures or energy sources, or by using a laser to cut conduits in the same.
The method of manipulating the material which will form the framework 32, of course, wi l l depend on the materi al chosen and the characteristics of the framework 32 desired to be formed from the mass of material. The preferred method used for manipulating photosensitive resin, is controlling the exposure of the liquid photosensitive resin to l~ght of an activating wav~length.
.

WO 9~/00416 PCl't 9 ~ 41 2~84999 .~
The relationship between the sides of the papermaking belt 10 of the present invention (that is, paper-contacting side 11 and backside 12 described above) and the surfaces of the framework 32 are best shown in FIG5. 3 and 4- The first surface 34 of the framework 32 preferably forms the paper-contacting side 11 of the papermaking belt 10. This relationship will usually exist in most embodiments of the present invention since the reinforcing structure 33 is positioned between the first surface 34 of the framework 32 and at least a portion of the second surface 35 of o the framework 32. That is, the first surface 34 of the framework 32 generally covers the paper-facing side 51 of the reinforcing structure 33.
The second surface 35 of the framework 32 of the papermaking belt 10 of the present invention, however, does not necessarily lS always form the backside 12 of the papermaking belt 10. Since the reinforcing structure 33 is posit~oned between the first surface 34 and at least a portion of the second surface 35 of the framework 32, the second surface 35 of the framework 32 can either, completely cover the reinforcing structure 33 (although this will generally not occur when the papermaking belt is made by the process described herein); cover only a port~on of the reinforcing structure 33; or, cover no portions of the reinforcing structure 33 and l ie entirely within the interstices 39 of the reinforcing structure 33. In the first case, the second surface ~5 35 of the framework 32 and the backside 12 of the papermaking belt 10 will be the same. In the second case, the backside 12 of the papermaking belt 10 will be comprised partially of the second surface 35 of the framework 32 and part~ally of the exposed portion of the reinforcing structure 33. In the third case, the backside 12 of the papermaking belt 10 will also be comprised parti al ly of the second surface 35 of the framework 32 and partially of the reinforcing structure 33, but the machine-facing side 52 of the reinforcing structure 33 will be completely exposed on the backside 12 of the papermaking belt 10.

WO 92/00416 PCI`/US91/04258 FIG. 2 shows that the first surface 34 of the framework 32 (and the paper-contacting side 11 of the papermaking belt lO) is comprised of a portion of a network which is designated 32a. As used herein, the term "network" refers to the portions of the S framework 32 which surround the conduits 36 and define a net-like pattern. In other words, the network 32a is the solid portion of the framework 32. As shown in the enlarged photographs of the papermaking belt ~0 of the present invention, FIGS. 35A and 35B, the network 32a has two network surfaces 34a and 35a. As used herein, the term "netwqrk surface" refers to one of the surfaces of the network 32a which surrounds the conduits 36. These network surfaces are also referred to herein as the "knuckles" of the framework 32. The knuckles of the framework 32 are, however, to be distinguished from the previously described knuckles formed by the yarns of the reinforcing structure 33. The term "network surface" was al so used i n the patents i ssued to Trokhan and Johnson, which are incorporated by reference herein. As used herein, however, the term "network surface" will be modified by specifying whether the network surface ,er~.~r,ted is the "paper Z side network surface" or the "backside network surface".
The term "paper side network surface", (or "paper side network" for short) refers to the sol id portion of the framework on the top, or the first surface 34 of the framework 32. Thus, the surface of the framework which is referred to as the "network 2s surface" in the patents which are incorporated by reference herein generally cu,, e jp~nds to the paper side network surface in the present specification. The paper side network surface is represented by reference numeral 34a in the drawings.
The term "backside network surface", (or "backside netwûrk'' for short) refers to the solid portion of the framework 32 on the bottom, or the second surface 35 of the framework 32. The backside network surface is represented in the drawings by reference number 35a.

WO 92J00416 PCI~/US91/04258 ~ , 20849gg As shown in FIGS. 2-4, the first surface 34 of the framework 32 comprises both the paper side network surface 34a, and first conduit openings 42. The first conduit oFenings 42 are the openings of the conduits 36 along the first surface 34 of the framework 32. The second surface 35 of the framework 32 comprises both the backside network surface 35a and second conduit openings 43. The second conduit openings 43 are the openings of the conduits 36 along the second surface 35 of the framework 32. The paper side network surface 34a and the first conduit openings 42 in the first surface 34 of the framework 32 will often be described herein as being "complementary" because together they respectively comprise one entire surface of the framework 32. For the same reason, the backside network surface 35a and the second conduit openings 43 will likewise be described herein as compl ementary .
As shown in FIG. 2, the paper side network 34a is macroscopically monoplanar, patterned, and continuous. This allows a uniform pattern to be imparted to the paper web during processing. By "macroscopically monoplanar,~ it is meant that when a portion of the paper-contacting side 11 of the papermaking belt 10 is placed into a planar configuration, the paper side network 34a is essentially in one plane. It is said to be "essent~ally~ monoplanar to recognize the fact that deviations from absolute planarity are tolerable, but not preferred, so long as the deviations are not substantial enough to adversely affect the ~. rG,, : of the product formed on the papermaking belt 10.
The paper side network 34a is said to be "continuous" because the lines formed by the network on the paper side network surface 34a must form at least one essent~ally unbroken net-like pattern. The pattern is said to be "essentially" continuous to recognize the fact that interruptions in the pattern are tolerable, but not preferred, so long as the interruptions are not substantial enough to adversely affect the r~e. ru, lce of the product made on the papermaking belt 10.

WO 92~00416 PCI`/US91~04258 The conduits (or "deflection conduits") 36 which pass from 4999 the first surface 34 of the framework 32 to the second surface 35 _~08 f the framework 32 ?re shown in FIGS.~ 2-4. Each con~duit 36 defines certain features, which include: a channel portion or a hole, generally designated 41; a mouth, or conduit opening (also known as a "gross foraminan), such as first conduit opening 42 formed along the first surface 34 of the framework 32; a mouth, or conduit opening, such as se~ond conduit opening 43 formed generally along the second surface 35 of the framework 32; and, o conduit walls, generally designated 44, which define the dimensions of the conduits 36 in the interior portion of the framework 32. (The ';interior portion" of the framework is the portion of the framework 32 which l ies between the first and second surfaces 3i and 35). As shown in FIGS. 2-4, the walls 44 lS of the conduits 36 form the interior walls 44a of the framework 32. The interior walls 44a of the framework 32 are the surfaces of the framework 32 which are coterminous with the walls 44 of the conduits 36. In other words, the walls 44 of the conduits 36 have the same or coincident boundaries with the interior walls 44a of the framework 32. The second conduit openings 43 are described as being formed "generally along" the second; surface 35 of the framework 32 because if one or more passageways 37 intersects with a second conduit opening 43, at least a portion of the second conduit opening 43 may be displaced so that it actually lies between the first surface 34 of the framework 32 and the surrounding portions of the second surface 35 of the framework 32.
In other words, port~ons of second conduit openings 43 may lie inward (toward the center of the belt) from the plane defined by the adjacent portions of the second surface 35 of the framework 32.
FIG. 2 shows that the first conduit openings 42 in the first surface 34 of the framework 32 are uniform and of a particular geometry. The second condu~t openings 43 in the second surface 35 of the framework 32 are also of basically the same geometry as the first conduit openings 42. However, as shown in FIG. 35B, the 2~84999 "
passageways and surface texture irregularities present in the backside network 35a of the framework 32 can cause the second conduit openings 43 to be distorted and very irregular in shape.
This distortion is not particularly problematic in the present invention however because the backside network 35a which surrounds the second conduit openings 43 does not contact and impress a pattern into the paper web during formation.
Although there are an infinite variety of possible geometries for the openings 42 and 43 of the conduits 36 certain broad guidelines for selecting a particular conduit opening geometry can be stated. These guidel ines are set forth in Col . 5 l ine 34 through Col. IO line 35 of U.S. Patent 4 528 239 ent1tled "Deflection Member~ which issued to Paul D. Trokhan on July 9 l 985 .
The shape and ~rrangement of the conduits 36 shown in FIG. 2 are in ~n especially preferred form. The shape of the conduit openings 42 and 43 depicted in these figures is referred to herein as being in ~ ~line~r Idaho~ pattern. As shown in FIG. 2 the linear Idaho conduits are rough1y in the shape of modified parallelograms in cross-section. The shape of the conduits 36 is described ~s resembling modifled parallelograms because in this plan view each conduit 36 has four sides in which each pair of opposite sides are parallel the angle between ~djacent sides are not right ~ngles and the corners formed between adjacent sides are rounded. Thus the linear Idaho conduit openings may also be described ~s p~rallelograms having rounded corners.
The details of the construction of these line~r Idaho conduits 36 are shown in F~G. 19. Only a portion of the fr~mework 32 of the paperm~king belt IO showing the repe~ting pattern of conduits 36 is shown in FIG. lg. In addltion only the p~per side network surf~ce 34~ on ~ll but one of the conduits is shown for clarity of illustration. The particular shape of the conduits 36 is arrived ~t in the m~nner described below. As will be apparent B

WO 92/00416 2 0 8 ~ ~ 9 9 PCl'JUS91~042~;X

however, it is possible to vary the sequence of the steps and arr~ve at the same result. It is also apparent that the points, l ines, and circles used to arrive at the shape of the conduits (except to the extent that they form the walls 44 of the conduits 36) will not be actually visible in the conduits 36 constructed by the procedure described below.
To form a geometrical shape in a linear Idaho pattern, initially, two points, P1 and P2, are selected which lie a certain distance, dl, apart from one another. The line connecting the two points, P1 and P2, will' be referred to as the machine direction axis, or longitudinal axis AL, of the conduit. The distance, dl, between the two points, P1 and P2, (which is equal to the length of the longitudinal axis AL), is preselected. At each of these points, a circle of a given radius, R1, is drawn. Next, a line AT
is drawn perpendicular to the longitudinal axis AL of the conduit.
This next line AT is drawn through the longitudinal axis AL, so that it bisects the ~ongitudinal axis AL. Two points, P3 and P4, are then placed equidistant from the longitudinal axis AL on the second line AT. The distance, d2, between points P3 and P4 is also preselected. The line connecting points P3 and P4, AT, will be referred to as the cross-machine direction axis or tl<..,sv~.se axis of the conduit. At both points P3 and P4, a circle of a given radius R2 is drawn. Although the latter radius, R2, does not have to be equal to the radius R1 of the circle drawn earlier, in the preferred pattern shown in FIG. 19, R1 equals R2. As a final step, tangent lines, L1, L2, L3, and L4, are drawn between portions of the four circles previously drawn. The tangent lines are drawn so that they are tangent to the p~rtions of the circles which are farthest away from the intersection of the longitudinal axis AL and the transverse axis AT. The line which passes around the perimeter of the shape thus described forms the walls 44 of the l inear Idaho conduit 36. As shown in FIG. 19, the sides of the first conduit openings are designated 45a, 45b, 45c, and 45d, and the rounded corners between adjacent sides are designated 46.
3s The c~ s,~ ~ing sides of the second c nduit openings 43 are PCr/US91~042~8 wo 9~l004~6 ~ 47 2084999, designated 45e, 45f, 459, and 45h. The corresponding corners of the second conduit openings 43 are designated 46a Other suitable shapes for the conduits 36 in the framework 32 of the papermaking belt 10 of the present invention include, but S are not limited to, the modified hexagon described in the patents issued to Trokhan and Johnson, incorporated herein by reference, and the "Bow tie", or "Sine-Curve" pattern shown in FIG. 20.
Regardless of the shape of the conduit openings, whether they be in the shape of the preferred linear Idaho pattern, or in some other shape, the number of conduits 36 per a given area of the belt and the proportionate amount of space occupied by the conduit openings in the framework 32 of the papermaking belt 10 of the present invention should be within certain ranges.
The number of conduits 36 present in the framework 32 is generally expressed in terms of the number of conduits per square i nch of the total surface area of the framework 32 . As used herein, the term "total surface area of the framework" refers to the sum of the surface area of either the paper side network surface 34a and the complementary surface area occupied by the first conduit openings 42, or the sum of the surface area of the backside network surface 35a and the complementary surface area occupied by the second openings 43. The number of conduits 36 present in the framework 32 should preferably be between about 10 and about 1,000 per square inch.
2s The proportionate amount of space occupied by the conduit openings is generally expressed herein as a percentage of the total surface area of the framework 32. It is also common in this specification to express the proportionate amount of space occupied by the complementary network surfaces of the framework, 34a and 35a, as percentages of the total surface area of the framework 32. The space occupied by the paper side network surface 34a and the backside network surface 35a are generally WO 9l/00416 PCI~/US91/04258 2~8499~ referred to herein as the "knuckle areas" of the respective surfaces of the framework 32. These knuckle areas are shown as AN1 and AN2, respectively, in FIGS. 19A and 19B. The paper side knuckle area (or first surface knuskle area) ANI (shaded in FIG.
l9A), is the projection of the paper side network surface 34a in the z-direction into a plane. The backside knuckle area (or second surface knuckle area) AN2 (shaded in FIG. I9B), is the projection of the backside network surface 35a in the z-direction into a plane. The proportionate amount of space occupied by the condult openings can be deri7ved from the amount of space occupied by the knuckle areas of the framework 32. Since the area occupied by the openings of the ~condu~ts and the area occupied by the respect~Ye network surfices are complementary, the total of the two percentages is equal to IOOX. If either the knuckle areas are known, or if the proportionate amount of space occupied by the conduit openings is known, the complementary area can be calculated by subtracting the known percentage from 100%.
The proportionate amount of space occupied by the first conduit openings 42 in the first surface 34 of the framework 32, is preferably between about 30X and about 80% of the total surface area of the framework 32. In other words, the first surface 34 of the r. . k 32 has about 20% - 70X knuckl e area. The proportionate amount of space occupied by the second conduit openings 43 in the second surface 35 of the framework 32 is preferably between about 30X and about 80% of the total surface area of the framework 32. In other words, the second surface 35 of the framework 32 has about 20% - about 70% knuckle area.
The particular a~, .r.~ t of the ~ndividual conduits 36 and spacings between the conduits 36 shown in FIG. 2 is but one possible a- (a.,D ~ of the condults 36. There are a number of preferred a, . ~1.5 ts of the individual conduits 36 and spacings between the conduits 36. Several of these preferred a~.~."3 -ts and spaclngs are set forth in the discussion in Col. 8, lines 35 -58 of U.S. Patent 4,528,239, entitled "Deflection Member", which wO 92/00416 PCrtUS91/a42~
49 2a8~999 issued to Paul D. Trokhan on July 9, 1985, which discussion is incorporated by reference herein. A particularly preferred r3 t of conduits 36 and spacings between cûnduits 36, however, is the bilaterally staggered array of openings shown in FIG. 2. In F~G. 2, it is shown that in this particularly preferred a,.~r.3 t and spacing, the openings 42 of the conduits 36, such as first conduit openings 42, are of sufficient size and spacing that, in any direction, the edges of the conduits 36 extend past one another.
In an especially preferred embod~mellt of the papermaking belt 10 of the present inYention having linear Idaho shaped conduits, the parameters of the conduits 36 (that is, the number, size, and a~ of conduit openings) are designated herein as a a300 linear Idaho with 35% knuckle areaa pattern. The first number of the above designation represents the number of conduits 36 present in the framework 32 per square inch. Thus, the framework 32 has 300 conduits per square inch. The second number (i.e., 35%
knuckle area) refers to the ~yp.u,c~",~te surface area, or knuckle area, of the paper side network surface 34a. In this preferred embûd~ment, the papermaking belt is constructed 50 the surface area, or knuckle area, of the backside network surface 35a is approximately 65%.
The dimensions used in the construction of the cûnduits 36, as well as the overall dimensions of the conduits, and the spacing between conduits 36 in the preferred 300 linear Idaho 35% knuckle area pattern are shown in FIG. I9. To construct condu~ts in the 30û linear Idaho 35% knuckle area pattern, the following lengths and radiuses are used: dl is .0425 inches (1-0795) mm, d2 iS
.024712 inches (.62785 mm), and R1 and R2 are both .012008 inches (.3050 mm). The overall dimensions of the openings of the conduits and the spacing between conduits in the first surface 34 of the framework 32 are represented by a seri es of reference letters in FIG. 19. In FIG. 19, reference letter ~a" represents the machine direction ~or "MD~) length, or simply the "length" of . ~

Wo 92/00416 . PCI~/US91/04258 208~999 so ~
an open;ng as il1ustrated, "b" the length of the opening as measured in the cross-machine direction (or "CDn), or the "width' of the opening, "c" the spacing between two adiacent openings in a direction intermediate MD and CD, "d" the CD spacing between adjacent openings, and "e" the MD spacing between ad~acent openings. In this preferred embodiment, "a" ls 1.6892 millimeters (.066506 inch), b 1.2379 mm 10.048737 inch), c 0.28153 mm (.011084 inch), d 0.92055 mm (.036242 inch), and e 0.30500 mm (.012008 inch) .
The condùits 36 h~ve a channel portlon 41 which l ies between the conduit openings 42 and 43. ~hese channel portions 41 are defined by the wa~ls 44 of the conduits 36. The overall characteristics oi these channe1 portions 41 and the walls 44 are shown in FIGS. 2 - 4. FIGS. 2 - 4 show that the hol~s or channels 41 formed by the conduits 36 e%tend through the en~ire thickness of the papermaking belt 10. In addition, as shown in FIG. 2, the conduits 36 are generally discrete. 8y ~discrete", it is meant that the condults 36 form separate channels, which are separated from each other by the framework 32. The separatlon of the ~ conduits 36 is particularly eYldent in the plan vlew of Figure 2.
The condults 36 are described as belng "generally" discrete, however, because as shown in FIG. 35B, for example, the conduits 36 may not be completely separated from each other along the second surface 35 of the framework 32 when patS~, r~ys 37 are present in the backside network 35a. The conduits 36 are also shown to be isolated in that there is no connection withln the body of the papermaking belt 10 between one conduit 36 and another. This isolation of one conduit 36 from another is partlcularly evident in the cross-sectional views of FIGS. 3 and 4. Thus, transfer of material (for example, fluids, such as the water removed from the paper web~ from one conduit 36 to another is generally not possible unless the transfer is effected outslde the body of the papermaking belt 10, or unless as in the belt shown in FIG. 35B, for instance, the transfer is eff~cted in the W<) 92/00416 PCl'JUS91/04258 51 20~8~999 ` ~ !
passageways 37 along certain portions of the backside 12 of the papermaking belt 10.
FIGS. 3 and 4 show the orientation of the conduits 36 in the framework 32. As shown in FIGS. 3-4, the conduits 36 have a vertical axis which is designated Av. The vert~cal axis Av is an imaginary line which passes through the center of each of the conduits 36 between the first conduit openings 42 and the second conduit openings 43. The orientation of the vertical axis Av determines the or~entation of the conduits 36 in the framework 32 relat~ve to the surfaces 34 and 35 of the framework 32. Thus, it should be understood that in the present invention, the vertical axis Av does not always have a truly vertical orientation; it is merely relatiYely vertical with respect to the longitud~nal and ~rO~ e.,e axes AL ~nd AT Of the conduits 36. The orientat~on of the vertical axis Av of the conduits 36 can range widely from an orientation in which the vertical axis Av is oriented generally perpendicular to the first and second surfaces 34 and 35 of the framework 32 to an orientation in which the vertical axis Av iS
oriented such that the conduits 36 are formed at an angle in the framework 32. Preferably, however, as shown in F165. 3 and 4, the vertical axis Av of the conduits 36 is generally approximately perpend~cu~ar to the first and second surfaces 34 and 35 of the framework 32.
The profile of the cross-section of the walls 44 of the conduits 36 is shown on enlarged scale in FIG. 21. The profilê of the walls 44 of the conduits 36 can be relatively straight, curved, partially curved and partially stra~ght, or irregular when viewed in cross-section. It should be noted that in the drawing figures other than FIG. 21 which show thê walls 44 of the conduits 36, the walls 44 of the conduits 36 are shown schematically as straight lines for ease of illustration. However, as shown in FIG. 21, it is believed that the profile of thê walls 44 of the conduits 36 may be nonl inear from the top surface 34 of the framework 32 to the bottom surface 35 of the framework 32.

6 PCr/US91/04258 - As shown in FIG. Zl, the profile of the walls 44 of the conduits 36 is essentially a straight line (in the region represented by reference numeral 47) from the first surface 34 of the framework 32 to a region along the walls 44, which begins s approximately at the points which have been marked with reference numeral 48. The points marked with reference numeral 48 are the approximate places where the paper-facing side 51 of the reinforcing structure 33 is encountered. At the points 4i3 at which the paper-facing side Sl of the reinforcing structure 33 is lo encountered, the profile of the walls 44 of the conduits 36 is less well-defined. At this point, the profile of the walls 44 of the conduits 36 generally becomes somewhat irregular. The portion of the walls 44 of the conduits 36 which displays an irregular profile is designated by reference numeral 49 in FIG. 21. The irregular portion 49 of the profile of the walls 44 of the conduits 36 is formed during the curing of the liquid photosensitive res~n into the framework 32. The ultraviolet light used to cure the resin is supplied by light sources whlch are positioned above tbe paper-facing side 51 of the reinforcing structure and the liquid photosensitive resin coating on top of the paper facing side Sl. The light rays diffuse or scatter to a certain extent when they encounter the strands of the reinforcing structure 33 causing the photosensitive resin to cure in an irregular manner. Thus, the exact location of the beginning of the irregular portion of the walls 44 will vary depending on the place at which the reinforcing structure 33 is encountered.
The relationship of the walls 44 of the conduits 36 relative to each other (i.e., the taper of the walls) can vary from cases in which the walls 44 are parallel to each other to cases in which the walls 44 are tapered either outward~y or tapered inwardly from the top surface 34 of the framework 32 to the bottom surface 35 of the framework 32. In addit~on, because the walls 44 of the conduits 36 form the interior walls 44a of the framework 32, as shown in FIGS. 2-4, the interior walls 44a of the framework 32 can ~s also be tapered. As used in reference to the tapering of the WO 92/00416 PCl'~US91~042!i8 ~ 53 2Q8499.9 walls 44 of the conduits 36 or the interior walls 44a or rne framework 32, the term "outwardly" refers to the relationship in wh~ch the distance between the opposed walls 44, or interior walls 44a changes from a lesser value to a greater value. The term ninwardly" refers to the opposite relationship (that is, a relationship in which the distance between the walls 44, or lnterior walls 44a changes from a greater to a lesser value).
FIGS. lA and B show one embodiment of the condu~ts 36 in which the walls 44 of the conduits 36 are parallel to each other.
FIG5. 2-4 show a preferred embodiment of the present invention in which the walls 44 forming the inside of the conduits 35 are tapered inwardly from the top surface 34 of the framework 32 to the bottom~ surface 35 of the framework 32. When the walls 44 of the conduits 36 are tapered either inwardly or outwardly, the interior walls 44a of the framework 32 will bear the opposite relationship to each other. Thus, as shown in FIGS. 2-4, when the walls 44 of the conduits 36 are tapered inwardly from the top surface 34 of the framework 32 to the bottom surface, the interior walls 44a will be tapered outwardly from the top surface 34 of the framework 32 to the bottom surface 35. The tapering of the walls 44 and interior walls 44a is controlled by collimating the light used to cure the photosensitive resin.
Preferably, the interior walls 44a of the framework 32 are tapered outwardly from the top surface 34 of the framework 32 to the bottom surface 35 of the framework 32 in an amount such that the surface area of the paper side network 34a is less than about 70% of the total surface area of the framework 32, and the surface area of the backside network 35a in the second surface 35 of the framework 32 is at least about 45X of the total surface area of the framework 32. In an especially preferred embodiment, the interior walls 44a are tapered such that the surface area of the paper side network 34a (first surface knuckle area ANl) is approximately 35% of the total surface area of the framework, and the surface area of the backside network ~5a (second surface WO 92/OW16 PCI~/US91/W2S8 ' ~

208~99~ knuckle area AN2) is approximately 65X of the total surface area of the backside 12 of the papermaking belt 10 of the present invention prior to the formation of the passagew3ys 37 in the backside network 35a. In this especially preferred embodiment of the present invention, the angle of the taper, aT shown in FIG.
21, of the walls 44 of the conduits 36 is approximately lS degrees from vertjcal.
The relationship between the framework 32 and the reinforcing structure 33 is shown in FIG5. 3 and 4. As shown in FIGS. 3 and lo 4, the reinforcing structure 33 is generally located more near the backside 12 of the papermaking belt 10 than the paper-contacting side 11 of the belt. While it is possible to create a belt in which the reinforcing structure 33 is located more near the paper side 11, such a construction is not preferred.
There are three primary reasons the reinforcing structure 33 is located more near the backslde 12 of the papermaking belt 10.
One reason is that the reinforcing structure 33 is generally placed adjacent to a casting surface during format~on, and as a result, only a limited amount of resin is generally present between the reinforcing structure 33 and the cast~ng surface.
This can, however, be altered without departing from the scope of this invention. Another reason is that lt is freouently preferable for the reinforcing structure 33 to serve as the wear surface or machine-contact~ng surface when the portions of the resin framework 32 along the backside 12 of the papermaking belt 10 wear thin because the reinforcing structure 33 provides more a durable surface for contacting the papermaking equipment over which the papermaking belt 10 passes than does the hardened polymeric resin which comprises the framework 32. A final reason j5 that a portion of the resin framework 3Z must cover the reinforcing structure 33 to form conduits 36 of the desired pattern and depth on top of the paper-facing side 51 of the reinforcing structure 33. The portion of the resin framework 32 covering the reinforcing structure 33 is referred to as "the WO 92100416 PCl-/US91/0425X
2~84999 overburden" and is designated as to in FIG. 21. The overburden enables the conduits 36 to adequately serve their purpose of providing an area into which the fibers in the paper web can be deflected so that these fibers can be rearranged without the interference of the strands of the reinforcing structure 33.
When it is said that the reinforcing structure 33 is located more near to the backside 12 of the papermaking belt 10, the particular dimensions involved can vary. In the preferred embodiment of the papermaking belt 10 of the present inventiont o the typical preferred woven element with stacked warp strands has a thickness of between about 10 mils and about 37 mils (.254 mm and .94 mm). The thickness of the resin ovelLu,d~., to is between about 4 mi l s and about 30 mi l s ( .102 mm and . 762 mm) . When the overburden to iS within this preferred range, the composite papermaking belt 10 is generally between approximately 14 and 67 mils thick (.356 mm and 1.70 mm). Other applications could require that the ovelLu,~n to be between about 2 mils and about 250 mils .(.051 mm and 6.35 mm) thick. This would, of course, change the overall thickness of the composite papermaking belt 10 accordinglY-FIGS. 3 and 4 show the characteristics of the backside 12 of the papermaking belt 10 ind the second surface 35 of the framework. As shown in FIG5. 3 and 4, the papermaking belt 10 has a textured backside 12. It is this textured backside 12 which is also~ referred to herein as "backside texturing~, or "backside texture~) which is of primary importance in the present invention.
As used herein with relation to the backside 12 of the papermaking belt 10, the term "texture" refers to the characteristic of the backside 12 created by discontinuities or nonplanar interruptions in what would ordinarily be a smooth or planar surface. These discontinuities or nonplanar interruptions can comprise projections from the plane of such a surface or depressions in such a pl anar surface .
;

2084999 FIGS. 2ZA through 22C show that a backside texture can be provided by different portions of a papermaking be1C when the belt comprises a framework and a reinforcing structure. It should be understood, however, that the particular types of backside texture s shown in FIGS. 22A through 22C will not necessarily be found in the papermaking belt I0 of the present invention. The particular type of backside texture likely to be formed in the papermaking belt of the present invention is shown in FIGS. 3, 4, and 22B, as well as in some of the other figures which follow. FIGS. 22A
through 22C show that the backside texture in general can be provided by: the passageways 37 that provide surface texture irregularities 38 in the backside network 35a of the second surface 35 of the framework 32; by the characteristics of the machine-facing side 52 of the reinforcing structure 33i or, by both the passageways 37 that provide surface t~xture irregularities 38 and the characteristics of the machine-facing side 52 of the reinforcing structure 33. The definitions of these terms and a description of the characteristics of the machine-facing side 52 of the reinforcing structure 33 are provided below. Each of the alternative ways the backside texture can be provided are then examined with reference to FIGS. 22A-22C.
As used herein, the term "passageways" means spaces through which air may pass. The term "pl~sa,f aj,~ shall not be construed to include spaces which are of any particular shape and size.
Thus, the passageways 37 described herein are not l imited to spaces which resemble tunnels and the like in shape.
As used herein, the term "surface texture irregularities" (or simply "irregularities~) refers to any discontinuity or nonplanar interruptions in an ordinarily smooth or planar surface, such as projections from the plane of a smooth surface and/or depressions 1n such a surface. The irregularities 38 comprise those portions which const~tute nonregular or uneven portions in the backside network 35a of the second surface 35 of the framework 32. As noted above, the paper side network surface 34a is macroscopically monoplanar a~d continuous. The surface texture irregularities , _ :.. ...... . . .

WO 92/00416 57 PCT~US91J042!;8 38 can be any discontinuities, or breaks in the resinous matériil which forms the backside network surface 35a, or any portions of the backside network surface 35a where resin has been removed or added to the backside network surface 35a.
The characteristics of the machine-facing side 52 of the reinforcing structure 33 which may form or contribute to form the backside texture are shown in FIGS. 22A through 22C. As shown in FIGS. 22A through 22C, the structural components 40a such as the knuckles and yarns of the woven reinforcing structure define lo several planes which are references for describing the backside texture of the belt 10. The backside 12 of the papermaking belt 10 of the present invention defines a plane which is designated Pb. The plane Pb defined by the backside of the belt is a plane which, if the backside 12 of the papermaking belt 10 of the present invention were placed on a flat surface, would lie in the same plane as the flat surface. The knuckles of the paper-facing si~e 51 of the reinforcing structure 33 (such as paper side knuckles such as 105b1) define a plane which is designated Pk1-The plane Pkl is referred to herein as "the plane defined by the paper-facing side of the reinforcing structure." The knuckles of the machine-facing side 52 of the reinforcing structure 33 (such as backside knu~kles 105b2) define a plane which is designated Pk2. The plane Pk2 iS referred to herein as "the plane defined by the machine-facing side of the reinforcing structure.~
As shown in FIGS. 22A, B, and C, the profile of the machine-facing side 52 of the reinforcing structure 33 cross-section has a specific contour or shape. As shown in these figures, the contour of the machine-facing side 52 of a woven WO 92~00416 PCI/US91/04258 208a999 reinforcins structure 33 is defined by some of the warp yarns 53 and some of the weft yarns 54 (which comprise the structural components 40a of the reinforcing structure 33). In addition, FIGS. 22A, B, and C show that portions of some of the warp yarns 53 and some of the weft yarns 54 on the machine-facing side 52 of the reinforcing structure 33 form raised port~ons lZ0. As used herein, the term "raised portions" refers to those portions of the warp yarns or weft yarns, or other structural components 40a that lie in the machine-facing side 52 of the reinforcing structure 33 and are disposed inward of the plane defined by the machine-facing side of the reinforcing structure Pk2-As used with reference to the planes and the raised portions 120 described above, the term "inward" means from either the paper side 11 of the papermaking belt 10 or the backside 12 of the papermaking belt 10 toward the center of the papermaking belt 10 (i.e., toward an imaginary line which lies midway between the paper side 11 and the backside 12). With relation to the abo.l~ d~s.r~bed planes, the term ~outwardn means from the center of the papermaking belt toward either the paper side 11 of the papermaking belt ~0 or the backside 12 of the papermaking belt 10.
The raised port10ns 120 in FIGS. 22A-22C are more specifically shown to be formed by those portions of the warp yarns 53 and the weft y~rns 54 which l ie in the machine-facing side 52 of the reinforcing structure 33 between the machine side knuckles, such as knuckles 105b2.
In the ~,.r~. .. d multilayer woven reinforcing structure 33 shown in ~IGS. 22A, 8, and C, the raised portions 120 are generally formed by portions of the warp yarns 53 of the second warp layer D, together with portions of the interwoYen weft yarns 54. More specifically, in the preferred reinforcing structure 33, the raised portions 120 will be formed by those portions of the warp yarns 53 in the second warp layer D and by those portions of the weft yarns 54 which lie both in the machine-facing side 52 of the reinforcing structure 33 and between those portions of the . . ~

WO 92/00416 PCI`/US91~04258 208~999 same yarns which form the machine-side knuckles 1052. In addition, as shown in FIG. 22D, when the reinforcing structure 33 is comprised of yarns having round cross-sections, and the bottoms of the yarns lie in the plane Pk2 some of the raised portions 120 will be formed by portions on the sides of the yarns which due to the curvature of the cross-section of the yarns, are spaced away from the plane defined by the machine-facing side of the reinforcing structure Pk2. These are referred to as ~raised perimeter portions", and are designated by reference numeral 120a in FIG. 22D. FIG. 22D shows that in the particular cross-section shown, these raised perimeter portions 120a are positioned within the projected warp areas Awp of the warp yarns 53 in the second warp layer D.
FIGS. 22A-22C also show that certain of the raised port~ons, the inwardly-spaced raised portions numbered 120', are spaced inward a greater distance from the plane defined by the machine-facing side of the reinforcing structure Pk2 than other raised portions 120. FIGS. 22A-C show that ln the preferred multilayer reinforcing structure 33, along the cross-section shown, it is believed that some of the inwardly-spaced raised portions 120' are formed by the warp yarns 53 in the second warp layer D. FIGS. 22A-C show that the points which form the bottom 53' of these warp yarns 53 form a surface, the "raised surface~, wh~ch defines a plane Pr. The plane Pr is referred to as the plane defined by the raised portions which form the raised surface .
It should be noted in reference to the drawing figures, that the distance the warp yarns 53 in the second warp layer D are spaced inward from the plane defined by the machine-facing side of the reinforcing structure Pk2 has been somewhat exaggerated in FIGS. 22A-C, and in some of the other figures as well, for purposes of illustration. It should be understood that in some variations of the reinforcing structure 33, these warp yarns 53 may be spaced inward in different amounts. As shown in the O 92/0G416 PCr/US91/04258 2~999 variation of the reinforcing structure 33 depicted in FIG. 22D, the warp yarns 53 in the second warp layer D may even 1ie in the same plane as the plane defined by the machine-facing side of the reinforcing structure Pk2. In that case, they will not be inwardly-spaced at all.
, The alternative ways in which the passageways 37, the surface texture irregularities 38 and the characteristics of the machine-facing sidje 52 of the reinforcing structure 33, can as a general matter,~contribute to form the backside texture are shown in FIGS. 22A-22C. One way that a texture on the backside 12 of a papermaking belt can be provided is shown in FIG. 22A. In FIG.
22A, the texture is provided entirely by the passageways 37 that provide surface texture irregularities 38 in the backside network 35a of the framework 32. As shown in FIG. 22A, the second surface 35 of the framework 32 completely covers the reinforcing structure 33 when the backside texture 12 is provided entirely by the paCsa]~ 37 and the irregularities 38. While this type of texturing can be created using methods other than the method described herein, it will generally not be created when making a papermaking belt using the process described herein.

As used herein, in reference to the surfaces of the framework 32, the term ~covers~ means that the side of the reinforcing structure 33 in issue is positioned completely between the first and second surfaces 34 and 35 of the framework 32. The surfaces of the framework 32 are considered herein to "cover" the side of the reinforcing structure 33 in ~ssue when they are so positioned even though there are portions of the reinforcing structure 33 which lie within the conduits 30, and as a result will not have a resinous material on either side.
As shown in FIGS. 22B and 22C, the backside texture can be provided partially by the ~ csa3S ays 37 and irregularities 38 and partially by the contour of the machine-facing side 52 of the reinforcing structure 33. FIG. 22B shows one alternative -Cl ~US91/04258 W~ 92/~0416 p 61 20849~9 situation in which the second surface 35 of the framework 32 generally does not cover any portions of the reinforcing structure 33 so that the machine-facing side 52 of the reinforcing structure 33 is exposed. FIG. 22C shows another alternative situation in which the second surface 35 of the framework 32 covers portions of the machine-facing side 52 of the reinforcing structure 33, and leaves other portions of the reinforcing structure 33 exposed.
The types of backside texturing shown in FIGS. 22A through 22C are the three basic types of backside texturing. These types of backside texturing are referred to for convenience as "positive backside texture"; "negative backside texturen; and a combination of both "positive and negative backside texture~.
By "positive backside texture", as shown in FIG. 22A, it is meant ~ at the passageways 37 extend from the plane Pb defined by the backside 12 of the belt 10 toward the plane defined by the machine-facing side of the reinforcing structure Pk2. As shown in FIG. 22A, in the case of positive texturing, the plane defined by the machine-facing side of the reinforcing structure Pk2 l ies inward of the plane defined by the backside of the papermaking belt Pb. Thus, the reinforcing structure 33 is positioned completely between the first surface 34 of the framework 32 and the second surface 35 of the framework 32.
Another, and perhaps an easier way of looking at positive backside texture is to look at the relationship between the passageways 37 and irregularities 38 and the plane defined by the machine-facing side of the reinforcing structure Pk2, rather than at relationship the passageways 37 and the surface texture irregularities 38 form with the plane defined by the backside of the papermaking belt, Pb. In the case of positive backside texture, as shown in FIG. 22A, the passageways 37 are positioned outward of the plane defined by the machine-facing side of the reinforcing structure Pk2. The surface texture irregularities 38 WO 92~00416 PCI'/US91/042S8 208499~
extend outward from the p1ane defined by the machine-facing side of the reinforcing structure Pk2-By "negative backside texture", as shown in FIG. 22B, it is meant that the passageways 37 extend inward from the plane defined by the machine-facing side of the reinforcing strùcture Pk2 toward the plane defined by the paper-facing side of the reinforcing structure Pkl. In papermaking belts which are exclusively negatiYely textured, the plane defined by the backside of the papermaking belt Pb, and the plane defined by the machine-facing lo side of the reinforcing structure Pk2 will be the same.
By "positive and negative backside texture", as shown in FIG.
22C, it is meant that both types of passageways described aboYe are present. Thus, some of the p~sa, i~5 37 are disposed inward of the plane defined by the machine-facing side of the reinforcing structure Pk2, and some of the Fa~sa, a~, 37 are positioned outward from the plane defined by the machine-facing side of the reinforcing structure. In the case of positive and negative backside texture, the plane defined by the machine-fac~ng side of the reinforcing structure Pk2 l~es inward of the plane defined by the backside of the papermaking belt Pb.
It is apparent from an examination of the three figures discussed above that the wear surface of a papermaking belt having the different types of backside texture will differ.
As shown in FIG. 22A, the wear surface of belts which have a positive backside texture will (at least at first) be comprised entirely of a resinous material. When the jagged projections comprising the surface texture irregularities 38 travel over the machinery employed in the papermaking operation, after many revolutions of the belt 10, these projections will tend to wear off so that at some point the wear surface will become virtually the same as the plane defined by the machine-facing side of the reinforcing structure Pk2. The new wear surface will comprise a WO 9Z/00416 PCl'JUS9~04258 2~8~ggg combination of the machine-facing side 52 of the reinforcing structure 33 and the resin from the framework 3Z which has been worn to a level eYen with the plane Pk2. At this point, there will be a very limited number of passageways 37 for air to pass through along the second surface 35 of the framework 32.
As shown in FIG. 22B, the initial wear surface of the belts which have a negative backside texture will generally be solely comprised of portions of the machine-facing side 52 of the reinforcing structure 33. In the case of negative texturing, the lo initial wear surface will thus be comprised of polyester (or one of the other materials specified above) which is generally more durable than the resinous material which comprises the framework 32. In addition, as shown in FIG. 22B, negatively textured belts may have p-ssa~ ays such as 37', which extend inwardly from the machine-facing side 52 of the reinforcing structure 33. When the belt is worn so that the wear surface coincides with the machine-facing side 52 of the reinforcing structure 33, these passageways 37' will still provide openings along the backside 12 of the belt. Thus, belts haYing a negative backside texture will generally cont~nue to allow air to escape across their backside 12 to a certain ,extent after having become worn.
As shown in FIG. 22C, the wear surface of the belts which have a combination of both negative and positive texture will, at least at first be comprised entirely of the resinous material which comprises the framework 32. When the jagged projections which comprise this resinous material wear off, the wear surface, as in the case of the belt shown in FIG. 22A, wlll, become virtually the same as the plane defined by the machine-facing s~de of the reinforcing structure Pk2. One difference between the belts shown in FIGS. 22A and 22C, however, is that because of the negative texturing there will still be p~Cs?3~ ays 37 in the latter belt after the positive texture has worn off. For this reason, it is believed that it is generally be preferable to have at least some negative texturing in the preferred embodiment of WO 92/00416 PCI'/US91/04258 2 0 8 4 9 9 9 the present invention to preserve a textured wear surface on the backside after the initial texture has been worn down.
In the present invention, the texture is formed on the backside 12 of the papermaking belt 10 by manipulating the liquid 5 photosensitive resin which when cured comprises the framework 32.
The liquid photosensitive resin is manipulated around the reinforcing structure 33 to form passageways 37 and surface texture irregularities 38 in the backside networl~ 35a of the second surface 35 of the framework 32. The location, 0 characteristics,~ ~nd distribution of the passa3e~ays 37 and the irregularities 38 in the papermaking belt are, therefore, generally described with respect to the reinforcing structure 33.
The def~nitions of several terms will be provided which will serve as r~f~.e,._es when describing the location, characteristics, and distribution of the passageways 37 and the surface texture irregularities 38 with respect to the re~nforcing structure 33.
As shown in FIGS. 12 and 12A, the passageways 37 and the surface texture irregularities 38 each define projected areas. It is to be understood that the passageways 37 and surface texture irregularities 38 are shown in a certain manner in FIGS. 12 and 12A for purposes of the following discussion and that the types of p~sa30 a;s 37 and irregularities 38 shown will not necessarily be found in all, or in any embodiments of the papermaking belt of the present invention. The projected area of the passageways 37 shown in FIGS. 12 and 12A is represented by reference letter Ap. As used herein, the projected area of a F~csaO ay 37 refers to the area defined by the projection of the passageway 37 in the z-direction. The projected area of the irregularity 38 shown in FIGS. 12 and 12A is represented by reference letter Aj. As used herein, the projected area of a surface texture irregularity 38 refers to the area defined by the projection of the irregularity 38 i n the z -d i rect i on .

PCr~US9lJ04~S8 wo 92/00416 2084999 ~
As used in this specification, when a passageway 37 or a surface texture irregularity 38 (or the projected area of a passageway 37 or a surface texture irregularity 38) is described as being "aligned with~, "lying within", or ~positioned within', or other similar terms with respect to one of the projected areas of the elements of the reinforcing structure 33 (or the framework 32), it is meant that the passageway or irregularity lies within the boundaries of the projected area in all planes into which the element in issue could be projected in the ~-direction. In other words, a passageway or an irregularity which "lies within" a projected area could be positioned above the element which defines the projected area, or below the element which defines the pro~ected area, or, even partially above, and partially below the element. In addition, portions of the passageway or irregularity could lie within one or more planes into which the element has been projected in the z-direction.
FIGS. 12 and 12A show several of the possible locations for the pacsajr ~ys 37 and the surface texture irregularities 38 described above. Examining FIGS. 12 and 12A from left to right, the first p ssa3 ay 37 shown lies part~ally within a projected warp area Awp. Part of this passageway 37 also lies outside of the projected warp area Awp. To the right of the first passageway 37 is an irregularity 38. The irregularity 38 shown in FI6S. 12 and 12A lies within a projected warp area Awp. ~o the right of the irregularity 38 is a third passageway 37. The third passageway lies entirely within a projected interstitial area Apj.
A fourth F~csa3. ay 37 is shown to the right of the third passageway 37. The fourth passageway 37 lies entirely within a projected warp area Awp.
It should be understood that when a passageway 37 or ~
surface te%ture irregularity 38 is described with reference to a projected area, this means that the position of the element of in issue is generally located as specified relative to the projected area. There may, however, be small portions of the passageway 37 ~ irregularity 38 which will not c~ o~d exactly with the area ~n issue. These slight variances in the actual position of the element from the projected areas can be attributed to at least two factors. One factor is the fact that the elements involved (such S as the ~assa3? ays and the irregularities) are extremely small and minor variations in the position of an element will be exaggerated wlth respect to the projected areas. This may cause the element to be sl ightly outside of the boundaries of the projected area.
The second factor results from the fact that the position of the o passageways 37 ànd the surface texture irregular1ties 38 are sometimes established by the manner in which the light rays which cure the liquid photosensitive resin comprising the framework 32 pass through the reinforcing structure 33. The direction these light rays travel is not always solely in the z-direction, and as a result, the projection of the above-described areas from the dlrection of the l~ght source may be slightly different from the project~on of the same areas in the z-direction.
The characteristics of the passageways 37 and the surface texture irregularities 38 are best discussed with relation to FIG.
21. As shown in FI6. 21, there is a relationship between the pa~S?3?W7ys 37 and the surface texture irregularities 38. The pa~sa3 ays 37 are openings for fluid, or more specifically, air, or air and water, to pass along the second surface 35 of the framework 32. When the passageways 37 are formed in the backside network 35a, they provide the surface texture irregularities 38.
The irregularities 38, therefore, are the portions of the backside network 35a of the framework 32 which surround the passageways 37.
In the general sense, however, the pa~Csa ~ys 37 themselves comprise surface texture irregularit1es because they are also discontinuities or irregularities in the ~ackside network 35a of the f1 ~Q: k 32 .
As shown in the FIG. 21, both the passageways 37 and the irregularities 38 are distinct from the conduits 36 which pass through the framework 32. By "distinct" from the conduit~, it is WO 9~ 416 PCI~US91J04258 67 20g4~99 meant that the passageways 37 and the irregularities 38 which comprise departures from the otherwise smooth and continuous backside network 35a of the framework 32 are to be distinguished from the holes 41 formed by the conduits 36. In other words, the holes 41 formed by the conduits 36 are not intended to be classified as passageways or surface texture irregu~arities.
The physical characteristics of the individual passageways 37 are shown in FIG. 21. It is to be understood that FIG. 2~ is an e%aggerated schematic view of a portion of a papermaking belt 0 which shows passageways 37 and surface texture irregularities 38 of a variety of different shapes. Thus, while the variety of the backside texturing shown in F16. 21 is useful in describing the general characteristics of the passageways 37 and irregularities 38, the particular backside texturing shown in FIG. 21 may not actually be found in tKe papermaking belt 10 of the present invention. The particular backside texturing of a given papermaking belt will depend upon the method used to make the belt. These particular textures will be discussed generally herein, and in conjunction with the method of making the papermaking belt of the present invent~on described herein.
Following the description of the method of making the papermaking belt, the backside texture of a representative papermaking belt will be discussed in conjunction with the enlarged photographs of one belt constructed in accordance with that method.
As shown in FIG. 21, the passageways 37 can have sides, which are designated generally by reference numeral 66. These sides can have an infinite number of different shapes. They can be curYed or relatively straight when viewed in cross-section, or partia~ly curved and partially straight. Oftentimes, however, the sides 66 of the passageways 37 wi l l be so i rregul ar that they are not capable of precise definition.
As shown in FIG. 21, the sides 66 of the passageways 37 can range from relat~vely vertical (i.e., oriented in the z-direction) WO 92/00416 PCI/US91/042~8 2~8~
to relatively horizontal (oriented in the x and y directions).
The angle that a side 66 forms relative to the ~-direction has been designated as aS in FIG. 21. It is to be understood, however, in the case of a passageway 37 which has curved or irregular sides, the size of angle aS will vary depending on the reference points used to measure the angle aS formed by the side 66 .
Further, each passageway 37 can have various numbers of different sides 66.- The number of sides 66 can vary from essentially one cDntinuous curved wall to Yirtually an infinite number of sides -of various cross-sections. In the simplified cross-section shown in FIG. 21, some of the passageways 37 appear to have sides 66 which resemble interior walls, or walls 66a. In addition, some of the passageways 37 which have relatively vertical walls 66a will have a side which resembles a roof, 66b.
One side of the passageways 37, however, will always be open. The open sides are designated 66c in FIG. 21.
In addition, although the passageways 37 are generally extremely minute, they have a finite height hp, width wp, spacing sp, and cross-sectional area Axp.
As shown in FIG. 21, the height hp of a passageway 37 is the distance, measured in the z-direction, from the plane defined by the backside of the belt Pb to a point, such as 66d, on the interior of the passageway 37. As shown in FIG. 21, the height hp of different portions of an individual passageway 37 may vary across the width of the passageway 37. In addition, the height hp of the various passageways 37 in the backside network 35a of the second surface 35 can vary from passageway to passageway.
The width wp of a passageway 37 is the distance, measured in some direction in the X-Y plane, depending upon the cross-section taken, between two points lying on the opposite side walls 66a of the passageway 37. If the side walls are formed by a single :

wo 92/00416 PCI/US91~042!i8 69 2~8~1999 ~urved surface, the width wp of the passageway is the distance measured ~n the X-Y plane between two points on opposite sides of the curved surface. As shown in FIG. 21, the width of a different portions of an individual passageway 37 may vary depending on the portion of the passageway 37 at which the width is measured. In addition, the width of the various passageways 37 in the backside network 35a of the second surface 35 can vary from passageway to passageway .
The cross-sectional area of a passageway Axp is represented by a cross-hatched area in FIG. 21. The cross-sectional area of a passageway Ap is the area measured on a given cross-section, of the interior portion of the passageway 37 which is bounded by an imaginary line which runs along the plane defined by the backside of the belt Pb. The combined cross-sectional areas ApT of the individual paCs~ ays 37 is important in that it is these areas through which air escapes when the papermaking belt of the present lnvention travels over a vacuum box during the papermaking process .
The spacing between adjacent passageways 37 is represented by reference letter sp in FIG. 21. The spacing sp between adjacent passageways 37 is defined herein with relation to two points of reference which lie on the sides of the irregularities 38 which border the passageway 37 in issue. These two points, shown as 109 in FIG. 21, lie on the sides of the irregularities 38 which are referred to herein as the coterminous sides of the irregularities 38. The coterminous sides of the irregularities 38, designated 67a, are referred to as such because they also form the sides 66 of the neighboring passageways 37. The two reference points 109 chosen are those points on the coterminous sides 67a which are the shortest distance measured in the z-direction from the plane defined by the backside of the belt Pb. In FIG. 21, the two reference points 109 actually lie in the plane Pb, but this will not always be the case. The spacing sp between adjacent p csaj æys 37, shown by the arrow in FIG. 21, is the distance , _ . , _ , . . _ . _ . . . _ WO 92/00416 PCr/USsl/042s8 . .~ ~ ~
2084999 measured in the X-Y plane between the reference point 109 on the coterminous side 67a of the irregularity 38 which lies between the passageways in issue .a the next adiacent reference point 109 which lies on the opposite coterminous side 67a of the same i rregul ari ty 38.
The overa,l pattern of spacing between the passageways 37 determines the distribution of the passageways 37. The passageways 37 can be distributed in an unlimited number of ways across the backside network 35a of the framework 32. The lo d~stribution of the passageways 37 can, for instance, be random, uniform, regular, or in some particular pattern.
An example of randomly-spaced passageways 37 are the passageways 37 of the belt 10 with a combination of positive and negative texturing shown in FIG. 22C. As used herein, the term "uniform" means that the density (or number) of passageways 37 is approximately the same over the entire surface, even though the passageways 37 do not form any particular pattern. As used herein, the term "regular" means that the spacing between adjacent passageways sp is approximately the same across the entire 2Q backside network 35a. An example of regularly-spaced passageways 37 are the passagewiys 37 of the belt I0 shown in FIGS. 3 and 4.
The belt 10 shown in FlGS. 3 and 4 also serves as an example of uniformly-spaced passageways in that the density of passageways is approximately the same over the entire surface of the backside 2s network 35a. The spacing between adjacent passageways 37 in the belt 10 shown in FIGS. 3 and 4 is sufficiently similar that the spacing of the passageways 37 shown therein could also be considered to be in a pattern.
The passageways 37 may also be distributed across "generally all" port~ons of the second surface 35 of the framework 32. By this it is meant that the passageways 37 can be found on any portion of the backside network surface 35a; and that there is no wo 9~/00416 Pcr~l~ss1/04258 71 2084ggg particular area, or areas, of the backside network surface 35a from which the passageways 37 are excluded. Thus, in the case where the reinforcing structure comprises a woven element, the passageways 37 can be located in the projected relnforcing area AR
or in the projected open area Ao of the reinforcing structure. By specifying that the distribution is across "generally all" of the backside network 35a, rather than across ~all" of the backside network 35a, it ls meant that while the passageways 37 can be found at virtually any particular place on the backside network lo 35a, the passageways 37 do not necessarily cover the ent~re backside network 35a.
The physical characterlstics of the individual surface texture lrregularities 38 are shown in FIG. 21. In additlon, a general descriptlon of surface texture lrregularltles is found ln Broadston, Marks' Standard Handbook for Mechanica1 Enqineers.
"Surface-Texture Designation, Productlon, and Control ,"
(McGraw-Hill l967) pp. 13-106 to 13-112, which is incorporated hereln by ,~r~. ~ . As shown in FIG. 21, the sldes of the surface texture irregularities 38 are generally deslgnated 67.
The surface texture irregularlties 38 of the present lnvention (like the F~Cs~3 ays) can have sides 67 wlth an infinite number of dlfferent shapes. As in the case of the passageways, the sides 67 of the irregularities 38 can be curved or relatively straight when viewed in cross-sect~on, or partlally curved and partlally straight. Oftentlmes, however, the sides 67 of the irregularities 38 are so irregular that they are not capable of precise definltlon.
As shown in FIG. 21, the sides 67 of the lrregularitles 38 can range from relatively vertical (l.e., sloped in the z-directlon) to relatively horizontal (sloped in the x and y directions). The angle that a side 67 of an irregularity 38 forms relative to the z-directlon has been designated as al in FIG. 21.
It is to be understood, however, in the case of an irregularity 38 which has curved or irregular sides, the angle al will depend on Wo 92/00416 Pcr/US9l/o4258 208~999 the reference points used to measure the angle aj formed by the side 67 of the irregularity 38.
Further, each irregularity 38 can have various numbers of different sides 67. The number of sides 67 can vary depending on the shape of the irregularity 38. For dome-shaped or knob-shaped irregularities, the side(s) 67 of the irregularity 38 will appear as one continuous curved l ine when viewed in cross-section. In cases where the irregularity 38 has a more complex geometry, there can be a virtu~atly an infinite number of sides 67 of various cross-sections`
FIG. 21 shows the previously-described coterminous sides 67a of the irregularities 38 which are formed by the interior walls 66a of the passageways 37. As shown in FIG. 21, these coterminous sides 67a will often be.relatively unequal in length because the coterminous sides 67a for a given irregularity 38 may be formed by the side walls 66a of two or more radically differently-shaped passageways 37.
FIG. 21 also shows that one or more of the s~des 67 of the irregularities 38 may not be formed by the same structure that forms the walls of neighboring passageways 37. These sides will be referred to as the i x'~ ' tly-formed sides of the irregularities 38, and are designated 67b in the drawings.
Oftentimes, these i nd~,Lr,d~..tly-formed sides 67b of the irregularities 38 will comprise a portion of the wear surface on the backside 12 of the belt 10.
In addit~on, as in the case of the passageways 37, although the irregularities 38 are generally extremely minute, they also have a finite height hj, width wj, spacing sj, and cross-sectional area Axj. As shown in FI6. 21, the boundaries of the irregularities 38 are frequently established by the coterminous sides 67 of the irregularities 38. Since the coterminous sides 67a of an irregularity 38 can be quite unequal, the precise height, and also the width, and cross-sectional area Axj of an irregularity 38 may be difficult to express.
For the purposes of definition of these characteristics of the irregularities 38, an arbitrary, but uniform reference point wil~ be chosen for taking these measurements. This reference point has been designated I10 in FIG. 21. The reference point 110 is a point which lies on the shortest of the coterminous sides 67a of the irregularity 38. More specifically, it is the point on the shortest of the coterminous sides 67a which is the greatest 0 distance inward from the plane defined by the backside of the belt Pb. FIG. 21 shows that the point 110 may be in two different places for neighboring irregularities 38.
As shown in FIG. 21, the height hj of any point on an irregularity 38 is the distance, measured in the z-direction, from a plane which passes through the reference point 110 for the irregularity 38 in issue to the particular point of interest on the irregularity 38. As shown in FIG. 21, the height hj of different portions of an individual irregularity 38 may vary across the width of the irregularity 38. In addition, the height hj of the various irregularities 38 in the backside network 35a can vary from i rregul ari ty to i rregul ari ty .
The width wj of an irregularity 38 is the distance, measured in the either the x-direct~on or the y-direction or in some direction in between which lies in the X-Y plane, depending upon the cross-section taken, between two points lying on the opposite sides 67 of the irregularity 38. If the sides 67 are formed by a single curved surface, the width wj of the irregularity is the dtstance measured in the X-Y plane between two points on opposite sides of the curved surface. As shown in FIG. 21, the width of a different portions of an individual irregularity 38 may Yary depending on the portion of the irregularity 38 at which the width is measured. In a~dition, the width of th~ various irregularities 2~8~999 74 38 in the backside network 35a can vary from irregularity to i rregul ari ty .
The cross-sectional area of an irregularity Axj is also represented by a cross-hatched area in FIG. 21. The s cross-sectional area of an irregularity Axj is the area measured on a given cross-section, of the portion of the irregu~arity 38 which lies between an imaginary line which passes through the reference point 110 and the plane defined by the backside of the bel t Pb-lo The irregularities 38 also have a spacing sj between adjacent irregularities 38. As shown in FIG. 21, the spacing between irregularities 38 in a given direction s~ is the distance measured ~n the X-Y plane between the reference polnt 109 which lies on the coterminous side 67 of one irregularity 38 to the reference point 109 which 1 ies on the nearest coterminous side 67a of the next ~rregularity 38.
The overall pattern of spacing between the ~rregularities 38 determines the distribut~on of the irregularities 38. Like the passageways, the irreguiarities 38 can be distributed in an unl imited number of ways across the backside network 35a of the framework 32. The distribution of the irregularities 38 can be random, un~form, regular, or in some particular pattern. As used herein, the term auniform" means that the density (or number) of irregular~ties 38 is approximately the same over an entire surface, even though the irregularities 38 do not form any part~cular pattern. As used herein, the term "regular" means that the spacing between adjacent irregularit~es sj is approximately the same across the entire backside network 35a. In addit10n, as in the case of the F~ s?j ayS 37, the irregularities 38 may be distributed across "generally all" portions of the backside network 35a. When the irregularities 38 are distributed across generally all" of the backside network 35a, it is meant that while the irregularities 38 can be found at virtually any wo9~1004~6 PCI/US91~û42~;8 75 2~84999 particular place on the backside network 35a, the irregularities 38 do not necessarily cover the entire backside network 35a.
Examples of the various d~fferent distributions of the irregularities 38 are shown in the same figures of the accompanying drawings which show the co" e~ponding types of d~stributions of the passageways 37.
In addition to having the characteristics described above, the irregularities 38 may also be described as either projections or depressions in the backside network 35a of the framework 32.
As used herein, if an irregularity 38 is referred to as either a pro~ection or as a depression, the frame of reference being used to describe the irregularity 38 is the plane defined by the machine-facing side of the reinforcing structure Pk2. Any ~rregularity 38 which projects outward from this plane in the z-direction ~s a projection. Any irregularity 38 which lies inward in the z-direction from the plane Pk2, is a depression.
The particular characteristics of the textured backside 12 of the preferred embodiment of the papermaking belt 10 of the present invention depend upon the method used to make the belt 10. When the belt is provided with a backside texture by using a deformable cast~ng surface as described herein, the particular characterist~cs of the backside texture also depend on the characterist~cs of the deformable surface (such as the amount the surface will deform and the extent to which ~t will deform into the machine-facing side 52 of the reinforcing structure 33). The part~cular characteristics of a representat~ve belt made with the process described herein are shown in the enlarged photographs of FIGS. 35A-C, and will be d~scussed in conjunction with the descript~on of the various alternat~Ye versions of the method used to make the belt shown in the photographs. There are certain general characteristics, however, which are common to the belts which are made by the various alternatives of the basic method.
These characteristics are best described with reference to the schematic drawing figure 22B.
.

n ~ 76 . /~
20849~ FIG. 22B shows $chematically one alternative embodiment of the papermaking belt 10 of the present invention. In the alternative embodiment shown in FIG. 22B, all of the passageways 37 are disposed inward of the plane defined by the machine-facing s side of the reinforcing structure Pk2, and a multiplicity of the passageways 37 are disposed between the plane defined by the machine-facing side of the reinforcing structure Pk2 and the raised portions 120 of the structural components 40a. FIG. 22B
also shows that at least portions of a multiplicity of the passageways, such as 37 and 37', are positioned in the interstices 39 so that a portion of the projected area of the passageways 37 corresponds with the projected open area of the reinforcing structure 33. In addition, as shown in FIG. 22B, certain of the raised port10ns of the reinforcing structure 33, the inwardly-spaced raised portions 120', are spaced inward a greater distance from the plane defined by the machine-facing side Pk2 than other raised portions 120 and define a raised surface, and the portlons of the passageways 37 which are positioned in the interst~ces 3g (or at least in the projected interstitial areas) of the reinforcing structure 33 are positioned predominately between the plane defined by machine-facing side of the reinforcing structure Pk2 and the plane defined by the raised portions which form the raised surface. The backside surface 12 of the papermaking belt 10 has sufficient fluid passage capacity to permit at least about 1,800 standard cubic centimeters/minute of air to escape across the textured surface.
It is believed that the problems which developed when using the prior smooth backsided papermaking belts was at least partially the result of the extremely sudden applicat~on of Yacuum pressure which was imparted to the paper web when the paper web was carried by the prior belt over the vacuum dewatering machinery employed in the papermaking process. It is bel ieved that the prior smooth backsided papermaking belts would actually temporarily create a seal oYer these vacuum sources. Then, when the deflection conduits of the papermaking belt of the prior type WO 92100416 PCI`/US91~042:!i8 ~7 2084999 were encountered, the vacuum pressure would be appl ied in an extremely sudden fashion to the fibrous web situated on top of the resin framework. This sudden application of vacuum pressure is bel ieved to have caused a sudden deflection of the very mobile fibers in the fibrous belt which was sufficient to allow these mobile fibers to pass completely through the papermaking belt.
The difference between the deflection of fibers in the fibrous web when carried by a prior belt lOa and by the papermaking belt lO of the present invention is illustrated schematically in FIGS. 23A
and 23B and graphically in FIG. 24.
FIG. 23A is a representation of what was believed to occur when the prior papermaking belts IOa encountered the vacuum dewatering equipment employed in the papermaking process, such as vacuum box 24. FIG. 23B is a representation of what is believed to occur when the improved papermaking belt 10 of the present invention encounters such a vacuum box 24. FIG. 24 is a graphical representation of the vacuum pressure (differential pressure) which is applied to the fibers in the embryonic web 18 as the papermaking belts shown in FIGS. 23A and 23B move across the vacuum slot of the vacuum box.
While each of the papermaking belts IOa and I0, respectively shown in FIGS. 23A and 23B comprises a framework 32, having a first surface 34, a second surface 35, and a reinforcing structure 33, the belts differ in that the backside network 35a in the second surface 35 of the framework 32 of bel t I0 i s textured whereas the backside network 35a of the framework 32 of belt IOa is smooth. It should be understood, however, that there are numerous other differences between the papermaking belt 10 of the present invention and the prior belts (including, but not limited to the shape of the conduits and the particular type of - reinforcing structure used) which are not shown in FIGS. 23A and 23B. The purpose of FIGS. 23A and 23B is to show the differences in operation of the belts which results from the differences in wo 92/004t6 Pcr/US91Jo42 2084999 their backsides. For simplicity and clarity, the other d1fferences have been omitted from FIG5. 23A and 23B.
As shown in FIG5. 23A and 23B, both belts 10a and 10 carry an embryonic web 18 (having individual fibers designated 18a) on the first surface 34 of their respective frameworks 32. In the figures shown, a portion of each belt 10a and 10 passes over a single slot 24d of a vacuum box 24. The portion of the vacuum boxes shown also include a leading surface, vacuum box surface 24c1, which is first;'encountered when the papermaking belts travel in the machine direction (from left to right in the figures) in the papermaking process, and a trailing surface, vacuum box surface 24c2, which is the surface of the vacuum box 24 which is encountered after the papermaking belts pass over the vacuum slot 24d. In addition, at each of the surfaces 24c1 and 24C2, adjacent the top of the vacuum slot 24d, is a lip, such as leading vacuum box surface lip 24bl and trailing vacuum box surface lip 24b2. A
vacuum V is applied from a vacuum source (not shown), which exerts pressure on the belts and the embryonic webs 18 in the direction of the arrows shown. The vacuum V remoYes some of the water from the embryonic web 18 and deflects and rearranges the fibers 18a of the embryonic web into the conduits 36 of the framework 32.
In FIG. 23A, because of the smooth nature of the backside network 35a of the framework 32, it is believed that a vacuum seal is created between the second surface 35 of the framework 32 and the leading surface 24C1 of the vacuum box 24 at the place designated with reference letter 5. When the belt 10a travels to the right, the vacuum slot 24d is encountered, the seal is suddenly broken, and the vacuum pressure V is suddenly applied to the embryonic web 18. This causes a sudden deflection of the fibers 18a in the embryonic web 18 into the conduits 36, and some of the more mobile fibers, designated 18a', to pass entirely through the belt 10a and accumulate on the trailing lip 24b1 of the vacuum box 24. It has been found that these fibers 18a' will eventually accumulate until they build up into clumps of fibers on 79 208~999 the trailing surface 24c2 of the vatuum box, creating ridges for papermaking belt lOa to travel over.
In FIG. 23B. on the other hand, since the backside 12 (particularly the backside network 35a of the framework 32) of the s belt 10 is textured, there are passageways 37 through which air can enter between the backside surface 12 of the papermaking belt 10 and the leading surface 24Cl of the vacuum box 24 to eliminate the seal between backside network 35~ of the frameworx 32 and the leading surface 24C1 of the vacuum box 24. The entry of air is o shown schem~tically by the large arrows YL. As shown in FIG. 233, the entry of air VL permits a more incremental deflection of the fiber 18a in the embryonic web 18. Few if any fibers pass through the papermaking belt 10 to accumulate on the trailing vacuum box lip 24b2. In addition, it is believed that the te%tured backside network 3Sa of the papermaking belt 10 shown in FIG. 23B may also - serve a scrubbing or cleaning function to remove any such fibers which accumulate on the trailing Yacuum box lip 24b2.
2. Process for Makin~ the P~normakin~ 3elt As indic~tet above, the papermaking belt 10 can take ~
variety of forms. While the method of construction of the papermaking bQlt 10 is immaterial so long as it has the characteristics mentioned above, certain methods have been discovered to be useful. 3y way of background, a detailed description of the process of making the "deflection member' (or "foraminous memberaJ which does not h~ve the i~ . ts disclosed herein is set forth in U.S. Patent 4,514,345, entitled 'Method of M~king ~ Foraminous Membera which issued to Johnson, et al. on April 30, 1985. One process for :making the ~ ~ - vv-_d p~re~-k~ belt 10 of the present i~vention and several variation6 of the same, is described below .
B

WO 92/00416 PCl/US91/042!;8 - - ~ 80 2 ~ 8 4 9 9 9 A preferred embodiment of an apparatus which can be used to - construct a papermaking belt 10 of the present invention in the form of an endless belt is shown in schematic outline in FIG. 25.
In order to show an overall view of the entire apparatus for 5 constructing a papermaking belt in accordance with the present invention, FIG. 25 was simplified to a certain extent with respect to some of the details of the process. The details of this apparatus, and particularly the manner in which the p~CS?, ys 37 and the surface texture irregularities 38 are imparted to the backside network 35a of the second surface 35 of the framework 32 are shown in the figures which follow. It should be noted at this point that the scale of certain elements shown may be somewhat exaggerated i n the fol l owi ng drawi ng f i gures .
The oYerall process shown in FIG. 25 generally involves coating a reinforcing structure 33 with a liquid photosensitive polymeric resin 70 when the reinforcing structure 33 is traveling over a forming unit or table 71 which is provided with a deformable, constant volume working surface (or ~casting surface") ~2. As shown in FIG. 25 and in the figures which follow, the resin, or ~the coating" 70 is applied to at least one (and preferably both) sides(s) of the reinforcing structure 33 so the coating 70 substantially fills the void areas of the reinforcing structure 33 and forms a first surface 34' and a second surface 35'. The coating 70 is distributed so that at least a portion of the second surface 35' of the coating is pos~tioned adjacent the working surface 72 of the forming unit 71. The coating 70 is also distributed so that the paper-facing side 51 of the reinforcing structure 33 is positioned between the first and second surfaces 34' and 35' of the coating 70. The portion of the coating which ~s positioned between the first surface 34' of the coating and the paper-facing side 51 of the reinforcing structure 33 forms a resinous u~c.Lu,d~n to'. The thickness of the ~ .Lu,J~n to' is controlled to a preselected value. The machine-facing side 52 of the reinforcing structure 33 is pressed into the deformable, 35 constant volume, working surface 72. As shown in FIGS. 28 and 30, USgl/04258 Wo 92100416 Pcr~
81 2~84999 this causes portions of the working surface 72 of the forming unit 71 to deform and form protrusions 96a. The protrusions 96a exclude portions of the the coating along the second surface 35' to form excluded areas 97 in the second surface 35' of the coating 70 which are defined by the protrusions 96a. The liquid photosensitive resin 70 is then exposed to a light having an activating wavelength (light which will cure the photosensitive liquid resin) from a light source 73 through a mask 74 which has opaque regions 74a and transparent regions 74b. The portions 70a o of the resin which have been shielded or protected from l ight by the opaque regions 74a are not cured by the exposure to the light.
As shown generally in FIG. 25, this uncured resin is then removed to leave conduits 36 which pass through the cured resin framework 32. The exposure of the resin 70 to light of the activating wavelength creates pa~s-3 ays 37 which provide surface texture irregularities 38 in the backs~de network 35a of the framework 32 in those portions which correspond to the places where the second surface 35' of the coating 70 was defined by the protrusions 96a in the working surface 72 of the forming unit 71 (that is, in the excluded areas 97). The type of p?~sa3- ays 37 and irregularities 38 created in the bacl~side network 35a of the papermaking belt 10 are determined by the characteristics of the machine-facing side 52 of the reinforcing structure 33 and the characteristics of the deformable, constant volume, surface of the forming unit, particularly the extent to which the surface deforms into the machine-facing side 52 of the reinforcing structure 33.
For convenience, the stages in the overall process are broken down into a series of steps and examined in greater detail in the discussion which follows. It is to be understood, however, that the steps described below are intended to assist the reader in understanding the method of making the papermaking belt of the present ~nvention, and that the method described below is not limited to only a certain number or ar.un~. t of steps. In this regard, it is noted that it is possible to combine some of the 35 following steps so that they are performed , ~i.tly.

... . . ....
84999 Likewise, it is possible to separate some of the following steps into two or more steps without departing from the scope of the present i nventi on .
First SteD
The first step of the process of the present inYentiOn is proYiding a forming unit 71 with a deformable, constant volume, working surface (or "deformable surface" for short) 72.
As described more fully below, there are various ways to provide a forming unit with a deformable, constant volume, working surface. These include, but are not limited to: (1) providing a deformable, constant volume, forming table, drum, or cyl inder (shown generally in FIG. 25); or, (2) (i) providing a forming unit, (ii) providing a deformable, constant volume, element having a working surface and a forming unit-contacting surface, and (iii) placing the forming unit-contacting surface of the element on the forming unit (two variations of which are shown in FIGS. 27-30).
Optionally, and preferably, as shown in FIG. 25, the basic ways of providing the forming unit 71 with a deformable, constant volume, working surface 72 set forth above additionally include a step of interposing a barrier film (or backing film) 76 between the reinforcing structure 33 and the working surface 72 of the forming unit during the casting process so that the barrier film 76 protects the forming unit 71 (or the element, as the case may be) from becoming contaminated with resin. FIGS. 29 and 30 show that in a most preferred embodiment of the process of the present invention, the deformable, constant volume, working surface is provided by an element as described in alternative (2) above, and the same element also serves as a barrier film which protects the forming unit from becoming contaminated with resin. The characteristics of the forming unit 71 and the components associated with the forming unit 71 are examined in greater detail bel ow.

WO 91100416 83 PCr~US9l/114,55 The forming unit 71 shown in FIG. 25 has working surface which is designated 72. In FIG. 25, the forming unit 71 appears as a circular element which is preferably a drum. The diameter of the drum and its length are selected for convenience. Its diameter should be great enough so that the barrier film 76 and the reinforcing structure 33 are not unduly curved during the process. It must also be large enough in diameter so there is sufficient distance of travel about ~ts surface so that the necessary steps can be accomplished as the drum is rotating. The lo length of the drum is selected according to the width of the papermaking belt 10 being constructed. The forming unit 71 is rotated by a conventional drive means which is not illustrated.
FlG. 27 is an enlarged schematic view of one alternative version of the casting process shown in FIG. 25. As shown in FIG.
27, the drum is provided with a deformable, constant volume, working surface 72 by a deformable, constant volume, element, such as deformable, constant volume, cover (or simply "deformable cover") 95. FIG. 27 also first illustrates that in the preferred embodiment of the present process, a hard rubber cover 91, preferably approximately one inch (2.54 cm) thick, is placed over the forming unit 71. The hard rubber cover 91 is for all practical purposes, /,o.~Lfol",dble. The deformable cover 95 has been slipped over the hard rubber cover 91. The deformable cover 95 has a working surface 95a and a forming unit-contacting surface 95b. The working surface 95a of the element and the working surface 72 of the forming unit 71 are the same in this case.
It is to be understood that utilizing a hard rubber cover 91 and placing a deformable cover 9S over the rubber cover 91 to provide the forming unit 71 with a deformable, constant volume, working surface 72 is merely one preferred embodiment of the process of the present invention. It is also possible to carry out the process of the present invention by eliminating the hard rubber cover 91, the separate deformable cover 95, or both. That is, provided that the surface of the remaining element (or WO 92/00416 PCI/US91/042~8 ~1,,' ``i`.' 84 208~999 - -elements) is a deformable, constant Yolume, surface. It should be understood that all of the various combinations of these elements, and the equivalents thereof, are within the scope of the present invention. However, in order to avoid presenting an undue multiplicity of relatively similar drawing figures, only the preferred embodiments of the present invention are shown.
I~evertheless, several of the possible combinations can be described with reference to the figures shown. For example, if the hard rub~be~r cover 91 is eliminated, the hard rubber cover 91 lo and the deformable cover 95 would appear as one and the same element in the drawings. If the deformable cover 95 is eliminated, a deformable, constant volume, hard rubber cover could be used instead of the combination of the separate deformable cover 95 and the hard rubber cover 91. If this is the case, the above two elements, 91 and 95 will also appear as one and the same element in the drawings. In another alternative, a deformable, constant volume forming unit 71 could be used, and both the hard rubber cover 91 and the separate deformable cover 95 could be eliminated. In this case, all three elements shown in the drawings, 71, 91, and 95, will appear as the same element.
Similarly, the barrier film 76 could be eliminated in which case it would not appear in the drawings.
As used herein with reference to the working surface 72 of the forming. unit 71, the deformable cover 95, and the like, the term ~deformable, constant volume" refers to an object which changes in shape under the application of forces or stresses, but has ~ total volume which remains the same. If one portion of the object is pressed inward, another portion will push out. In other words, the deformable, constant volume, working surface should be relattvely incompressible in the sense that such an inwardly-directed force will not cause the volume of the working surface, or any portions thereof to be appreciably condensed.
Thus, if the knuckles of the reinforcing structure 33 are pressed into the working surface, portions of the surface (the protrusions) will be pushed up toward the raised portions 120 of -WO 92/00416 PCI`~US91~
~ 85 20~999 the reinforcing structure 33 and into at least some of the interstices 39 of the reinforcing structure 33. The protrusions will take the path of least resistance to movement. In addition, it should be undetstood that when the terms "deformable, constant Yolume" are abbreviated herein as "deformable", it is meant that the element in issue also has a constant volume as described above .
In FIGS. 27-30, the deformed portions of the working surface 72 of the forming unit 71 are represented generally by reference number 96. The individual protrusions are designated 96a. The portions of the deformable surface which do not form protrusions and are pressed in by the reinforcing structure 33 (the "pressed-in portions") are designated 96b. As used herein, the term "protrusions~ refers to those portions of the working surface 72 which, either alone or in conjunction with portions of the barrier film 76, are disposed inward of the plane defined by the machine-facing side of the reinforcing structure Pk2 when the reinforcing structure 33 has been pressed into the working surface 72 of the forming unit 71 during the casting process described below. As used herein, the term "pressed-in portions" refers to those portions of the working surface 72 which, either alone, or in conjunction with portions of the barrier film 76, are disposed outward of the plane defined by the machine-facing side of the reinforcing structure Pk2 when the reinforcing structure 33 has been pressed into the working surface 72 of the forming unit 71.
Suitable deformable surfaces can have varying physical propert~ es, such as materi al or chemi cal compos i t i on, th i ckness, and compressive modulus. The only requirement is that the physical properties be such that the protrusions 96a formed in the surface be sufficient to impart the desired amount of backside texture to the papermaking belt 10 of the present invention after the steps outlined below are performed. It has been found that ~t is preferable to use surfaces which form relatively minute protrusions 96a under the conditions described herein so a certain WO 92100416 PCI~/US91/042~8 ~8~9~9 86 ~
amount of texturing will be imparted to generally all of the parts of the backside network 35a of the finished belt.
The deformable surface can be formed of any material which is sufficiently deformable to form the desired protrusions when the reinforcing structure 33 is pressed into the surface during the process of the present invention. As used herein, the term "desired protrusions" means protrusions sufficient to provide the cured belt with the desirable amount of backside texture after the remaining steps described below are carried out. Suitable materials incl~ù~ie various types of rubbers, including natural rubbers, silicone rubbers, and synthetic rubbers, as well as synthetic plastics, such as urethane and polyethylene.
The only limitation on the thickness of the deformable surface i s that i t be such that the deformabl e surface forms the desired protrusions when the reinforcing structure 33 is pressed into the surface during the process of the present ~nvention. The appropriate thickness will depend upon the material used for the deformable surface.
The compressive modulus of the material chosen for the deformable surface must also be such that the material is sufficiently deformable to form the desired protrusions. The particular material chosen for the deformable surface determines the general range within which the compressive modulus of the surface will fall. The compressive modulus of the deformable surface as measured by Shore hardness, is preferably between 30 Shore A and 90 Shore A. Most preferably, the Shore hardness is between 30 Shore A and 50 Shore A.
Preferably, the forming unit 71 is covered by a barrier film 76 which prevents the work~ng surface 72 from being contaminated with resin. The barrier film 76 also facilitates the removal of the partially completed papermaking belt 10' from the forming unit 71. Generally, when the deformable, constant volume, surface is WO 92100416 PCr~U591/042~;8 ~ 87 2084999 .
provided by one of the components other than the barrier film, the barrier film 76 can be any flexible, smooth, planar material which conforms to the working surface 72 of the forming unit 71. That is, the barrier film 76 should be flexible enough that it is capabl e of conformi ng to the character of the surface of the forming unit 71 so that the exposed surface of the barrier film 76 will have protrusions in roughly the same places as the protrusions 96a on the working surface 72 of the forming unit 71.
The barrier film 76 can be made from polypropylene, polyethylene, or polyester sheeting. Preferably, the barrier film is made from polypropylene and is from about 0.01 to about 0.1 millimeter (mm) thick. Preferably, the barrier film 76 also either absorbs light of the activating wavelength, or is sufficiently transparent to transmit such light to the working surface 72 of the forming unit 71, and the working surface 72 absorbs the light. The barrier film 76 is also typically chemically treated to prevent the resin from adhering to its surface and also to ensure that the resin spreads evenly across its surface. Preferably, this chemical treatment ~s a corona treatment. The corona treatment used in the preparation of the barrier film 76 involves apply an electrical d i scharge to the barri er f i l m 76 pri or to i ts i nstal l ati on i n the apparatus shown in FIG. 25.
As shown in FIG. 25, the barrier film 76 is introduced into the system from the barrier film supply roll 77 by unwinding it and causing it to travel in the direction indicated by directional arrow D2. After unwinding, the barrier film 76 contacts the working surface 72 of forming unit 71 and is temporarily constrained against the working surface 72 by the means discussed below. The barrier film 76 travels with the forming unit 71 as 30 the forming unit 71 rotates. The barrier film 76 is eventually separated from the working surface 72 of the forming unit 71 and travels to the barrier film take-up roll 78 to where it is rewound. In the embodiment of the process illustrated in FIG. 25, the barrier film 76 is designed for a single use after which it is 35 discarded. In an alternative ar, ~ t, the barrier film 76 can WO 92~00416 PCI/US91/04258 2 0 ~ 4 ~ 88 take the form of an endless be1t which traYels about a series of return rolls where it is cleaned and reused.
Preferably, the forming unit 71 is also provided with a means for insuring that barrier film 76 is mainta~ned in close contact 5 with its working surface 72. The barrier film 76 can be, for example, adhesively secured to working surface 72. Alternatively, the barrier film 76 can be secured to the working surface 72 by a vacuum appl i e,d through a p~ ural ~ ty of closely- spaced, smal l orifices distributed across the working surface 72 of the forming o unit 71. Preferably, the barrier film 76 is held against the working surface 72 by a conventional tensioning means which is not shown in FIG. 25.

FIGS. 29 and 30 show an espec~ally preferred means for providing the forming unit 71 with a deformable, constant volume, working surface 72. In FIGS. 29 and 30, the element which provides the forming unit 71 with a deformable, constant volume, working surface 72 also serves as a barrier film 76 which protects the forming unit 71 from becoming contaminated with resin. FIG.
29 is, therefore, an enlarged schematic view of another variation of the cast~ng process shown in FIG. 25. FIG. 30 is a further enlarged Yiew of the casting surface shown in FIG. 29. The alternative shown in FIGS 29 and 30 is preferred because with such an ~r, , t, it is not necessary for there to be a deformable, constant volume, surface on the drum which serYes as the forming unit, nor is it necessary for there to be a separate deformable, constant volume, element affixed to the forming unit (such as a separate deformable cover). In this especially preferred alternative, it is also not necessary that the barrier film 76 be conformable since the barrier film 76 is the element which provides the deformable, constant volume, surface.
Preferably, the barrier film 76 will not be planar either in this alternative (at least after the reinforcing structure 33 is pressed into 1t to cause it to deform). The other general characterlstics of the deformable, constant volume, barrier film, WO 921004~6 PCI`~US91J04258 89 2~8~999 however, are the same as those for the deformable, constant vol ume, surfaces descri bed above . Sui tabl e deformabl e, constant volume, barrier films include the same materials described above as being useful for forming the deformable surface.
s Second SteD
The second step of the process of the present invention is providing a reinforcing structure 33 for incorporation into the papermaking belt. The reinforcing structure 33 should have a paper-facing side 51, a machine-facing side 52 opposite the paper-facing side 51, interstices 3g, and a reinforcing component 40 comprised of a plurality of structural components 40a. In addition, portions of some of the structural components 40a should be disposed inward of the plane defined by the machine-facing side of the reinforcing structure Pk2 to form raised portions 120. A
section of such a reinforcing structure 33 is shown in FIGS. 28 and 30.
As noted above, the reinforcing structure 33 is the element about which the papermaking belt 10 is constructed. Any reinforcing structure disclosed in the preceding section of this specification can be used. Preferably, the reinforcing structure 33 is the woven, multilayer fabric shown in FIGS. 6 - 11 which is characteri~ed by warp yarns which are vertically stacked directly on top of one another.
Since the preferred papermaking belt 10 is in the form of an endless belt, the reinforcing structure 33 should also be an endless belt since the papermaking belt 10 is constructed around the reinforcing structure 33. As illustrated in FIG. 25, the reinforcing structure 33 which has been provided is arranged so that it travels in the direction indicated by directional arrow Dl about return roll 78a up, over, and around the forming unit 71 and around return rolls 78b and 78c. It is to be understood that in the apparatus used to make the papermaking belt of the present .

WO 92/00416 PCI~/US91/042~8 "`r~ 90 ~,o8~9 invention, there are conventional guide rolls, return rolls, drive means, support rolls and the like to drive the reinforcing structure 33 which are not shown in FIG 25 .
Third SteD
-The third step in the process of the present invention is bringing at least a portion of the machine-facing side 52 of the reinforcing structure 33 into contact with the working surface 72 of the forming unit 71 (or more particularly in the case of the embodiment illystrated, traveling the reinforcing structure 33 over the working surface 72 of the forming unit ll) As noted above, preferably a barrier film 76 is used to keep the working surface 72 of the forming unit 71 free of resin 70 In this case, the third step will involve bringing at least a port~on of the machine-facing side 52 of the reinforcing structure 33 into contact with the barrier film 76 in such a way that the barrier film 76 is interposed between the re~nforcing structure 33 and the working surface 72 of the forming unit 71 The exact manner in which the reinforcing structure 33 is positioned relative to either the working surface 72 of the forming unit 71 or the barrier film 76 depends upon the specific design desired for the papermaking belt 10 The reinforcing structure 33 can be placed in direct contacting relation with barrier film 76 Alternatively, the reinforcing structure 33 can be spaced some finite distance from barrier film 76 Any convenient means can be used to space the reinforcing structure 33 away from the barrier film 76 For instance the l iquid photosens~tive resin 70 could be applied to the machine-facing side 52 of the reinforcing structure 33 so that a portion of the coating lies between the reinforcing structure 33 and the working surface 72 of the forming unit 71 Preferably, however, at least a portion of the machine-facing side 52 of the reinforcing stru~tu~ 33 ~e g, ~he machine ~ide ~nuckles) ~s pl~ed ~ir~tly US9~/042S8 WO 92~00416 PCl`~
91 208~999 in contact with the working surface 72 cf the forming unit 71 (or the barrier film 76 if one is used). The other portions of the reinforcing structure 33, such as raised portions 120, will be spaced away from the working surface 72 of the forming unit 71.
Fourth SteD
The fourth step in the process is applying a coating of l iquid photosensitive resin 70 to at least one side of the reinforcing structure 33.
Generally, the coating 70 is applied so that the coating 70 substantially fills the void areas 39a of the reinforcing structure 33 (the void areas are defined below). The coating 70 is also applied so that it forms a first surface 34' and a second surface 35'. The coating 70 is d~stributed so that at least a portion of the second surface 35' of the coating 70 is positioned adjacent the working surface 72 of the forming unit 71. The coating 70 is distributed so that the paper-facing side 51 of the reinforcing structure 33 is positioned between the first and second surfaces 34' and 35' of the coating 70. The portion of the coating which, is positioned between the first surface 34' of the coating and the paper-facing side 51 of the reinforcing structure 33 forms a resinous O~b-J~d~A to'.
In addition, as discussed in greater detail below, the step of applying the coating 70 can be preceded by the sixth step described herein (of pressing the machine-facing side 52 of the reinforcing structure 33 into the working surface 7Z). If the steps occur in this order, the protrusions 96a in the working surface 72 will exclude portions of the coating 70 from certain r areas along the second surface 35' of the coating 70 at the same time as the coating 70 is applied. The protrusions will exclude the coating 70 from some of the spaces which l ie between the plane defined by the machine-facing side of the reinforcing structure Pk2 and the raised porti :ns 120 of the reinforcing -2Q84g99 .
structure 33. The coating 70 will also be e~cluded from portions of at least some of the interstices 39 of the reinforcing structure 33. The protrusions 96a in doing so form excluded areas 97 in the second surface 35 of the coating. The (shape and dimensions of the) excluded areas 97 are defined by the protrusions 96a.
For coating the reinforcing structure 33 suitable photosensitive resins can be readily selected from the many available commercially. Resins which can be used are materials usually polymers which cure or cross-link under the influence of radiation usually ultraviolet (UV) light. References containing more information about l iquid photosensitive resins include Green et al . "Photocross-l inkable Resin Systemsn J. Macro-Sci . Revs.
Macro Chem. C21 (2) 187-273 (1981-82); Bayer "A Review of Ultraviolet Curing Technology~ T~ppi Paper Synthetics Conf.
Proc. Sept. 25-27 1978 pp. 167-172; and Schmidle ~Ultraviolet Curable Flexible Coatingsn J. of Coated Fabrics 8 10-20 (July 1978). Especially preferred liguid photosensitive re~ins are; nt~ ed in the Merigraph series o~ resins zo made by Hercules Incorporated, Wilmington, Delaware.
A mo~t preferred resin i8 Merigraph resin EPD 1616.
In th~ preferred process of c~rrying out the present ~nvention ~nt~oxidants are ~dded to the resin to protect the flnished p~perm~king belt 10 from oxtdation ~nd incre~se the life of the p~perm~king belt. Any suit~ble ~ntioxidants can be added to the resin. The preferred antioxidants are Cyanox 1790 which is avail~ble from Americ~n Cyanamid of Wayne New Jersey 07470 and Iraganox 1010 which is made by Ciba Geigy of Ardsley New York 10502. In the ~. efe. ~d process for m~king the papermaking belt 10 of the present invention both antioxidants are added to the resin. The antioxidants are ~dded in the following respective ~mounts Cyanox 1190 1/10 of lZ ~nd Ir~ganox 1010 8/10 of lX.
Both antioxid~nts ~re added so the p~permaking belt 10 of the B

PCI`~US 1~04258 93 208~999 present invention is protected from several different species of oxidizing agents.
Any technique by which the liquid material can be applied to the reinforcing structure 33 is suitable for applying the coating 70. As shown in FIG. 25, in the preferred method of carrying out the present invention, the l iquid photosensitive resin 70 is appl ied to the reinforcing structure 33 at two stages. The first stage occurs at the place indicated by extrusion header 79. The first stage is referred to as the "pre-fill~ stage because it takes place before the portion of the reinforcing structure 33 being coated is brought into contact with the working surface 72 of the forming unit 71. At the first stage, a first coating of liquid photosensitive resin is applied to at least the machine-facing side 52 of the reinforcing structure 33 by the extrusion header 79 to at least partially fill the void areas 39a of the reinforcing structure 33. Preferably, the first coating substantially fills the void areas 39a of the reinforcing structure 33. The void areas are shown best in FIG. 22D. As used herein, the term "void areas" (or "void volume~) refers to all of the open spaces of the reinforcing structure 33 which lie between the plane defined by the paper-facing side of the reinforcing structure Pkl and the plane defined by the machine-facing side of the reinforcing structure Pk2 (that is, those spaces between the two planes not occupied by the reinforcing component 40). The void areas 39a thus comprise the interstices 39 and any other open spaces which lie between the planes Pkl and Pk2-The application of resin 70 by the extrusion header 79 is employed in conjunction with the application of a second coating of liquid photosensitive resin 70 at a second stage by a nozzle 80 located adjacent to the place where the mask 74 is introduced into the system. The nozzle 80 applies the second coat~ng of liquid photosensitive resin 70 to the paper-facing side 51 of the reinforcing structure 33. It is necessary that l iquid photosensitive resin 70 be evenly applied across the width of ~o84993 reinforcing structure 33 and that the requisite quantity of material be worked through interstices 39 to substantially fill the void areas 39a of the reinforcing structure 33. The second coating is applied so that the first coat~ng together with the second coating forms a single coating, coating 70, which has the first surface 34 and the second surface 35 described above, and is distributed as described above. Thus, the single coating 70 is distributed so that: at least a portion of the second surface 35 of the coating is positioned adjacent the wQrking surface 72 of lo the forming unit 71; the paper-facing side 51 of the reinforcing structure 33 is positioned between the first and second surfaces 34 and 35 of the coating 70, and the portion of the coating which is posit~oned between the first surface 34 of the coating 70 and the paper-facing side SI of the reinforcing structure 33 forms a resinous o~ u,~ to . In addition, the excluded areas 97 described above are similarly formed in the second surface 35 of the single coating by the protrusions.
In the drawings, it is thus seen that the stages at which the liquid photosensit~ve resin 70 is applied to the reinforcing structure 33 do not necessarily always occur in time sequence immediately after the th~rd step (of bringing at least a portion of the relnforc~ng structure 33 into contact with the working surface 72 of the forming unit 71) set forth above. That is, if one is looking at a part~cular portion of the reinforcing structure 33 which is traveling around the reinforcjng structure return roll 78a toward the forming unit 717 the (first stage of the) coating step occurs before, not after, the machine-facing side 52 of the reinforcing structure 33 is brought into contact with the working surface 7Z of the forming unit 7I. On the other hand, if one is looking at the overa11 process of a~ssembling the apparatus shown in FIG. 25, it is apparent that at least a portion of the endless belt which comprises the reinforcing structure 33 would generally be placed in contact with the working surface 72 of the forming unit 7I before any coating :f the reinforcing wo s2/004t6 PCrtUssl~on~s 95 2u8~99~
structure 33 takes place. As described herein, howeYer, the process is generally examined from the former perspective.
In the embodiment shown in the drawings, the second stage ofapplying the photosensitive resin (or "post-fill stagen) occurs after the place where the reinforcing structure 33 first comes in contact with the forming unit 71 when it is traveling around the reinforcing structure return rollers. It is to be understood that these two events (that is, applying the coating to the reinforcing structure 33 and bringing the reinforcing structure 33 into contact with the working surface 72 of the forming unit 71) could ~nstead occur simultaneously, or that the photosensitive resin could be applied to the top surface (that ~s, the paper-facing side 51) of the reinforcing structure before the point where the reinforcing structure 33 is first brought into contact with the forming unit 71. The pro~ess of the present invention is intended to.include all possible arrangements and sequences of the basic`
steps described herein. Preferably, however, the coating of the reinforcing structure 33 takes place in the order shown in the drawi ngs .
Fifth SteD
The fifth step in the process of this invention is controlling the thickness of the o~L,I.urJ.r. to' of the resin coating 70 to a preselected Yalue. In the preferred embodiment of the belt making apparatus shown in the drawings, this step takes 2s place at approximately the same time, i.e., simultaneously, with the second stage of applying a coating of liquid photosensitiYe resin to the reinforcing structure 33.
The preselected Yalue of the thickness of the 0~6.1,u,~cr, corresponds to the thickness desired for the papermaking belt 10.
This thickness, also naturally, follows from the expected use of the papermaking belt. Ilhen the papermaking belt 10 is to be used in the papermaking process described hereinafter, it ~s preferred 208~ that the thickness. t, of the p-permaking belt 10 be from about 0.01 mm to about 3.0 mm. Other applications, of course, can require thicker papermaking belts which can be 3 centimeters thick or thicker.
Any suitable means for controlling the thickness can be used.
The means used for controlling the thickness of the o~ Lu,~ to' illustrated in FIG. 25 is the use of nip roll 81, which also serves as a mask guide roll. The c1earance between the nip roll 81 and the forming unit 71 can be controlled mechanically by any conventiona~ mèans which are not shown. The nip roll 81, in conjunction with the mask 74 and the mask guide roll 82, tends to smooth the surface of liquid photosensit~ve res~n 70 and to control its thickness.
Sixth SteD
The sixth step in the process of this invention is pressing the mach~ne-facing side 52 of the reinforcing structure 33 into the deformable, constant volume, working surface 72.
The step of pressing the machine-facing side 52 of the reinforcing structure 33 into the working surface 72 causes portlons of the working surface 72 of the forming unit 71 to deform and form protrusions 96a between the plane defined by the machine-facing side of the reinforcing structure Pk2 and some of the raised portions 120 of the structural components 40a. It also forms protrusions 96a which extend into at least portions of some of the interstices 39 of the reinforcing structure 33.
There are a number of ways to press the machine-facing side 52 of the reinforcing structure 33 into the working surface 72 of the forming unit 71. One way is to apply a force normal to the surface of the mask 74 in the direction of the working surface 72 to press both the o~e,Lu,~,, to~ and the reinforcing structure 33 toward the working surface 72. Preferably, however, the WO 92~00416 PCI/US91/04258 2U8gggg machine-facing side 52 of the reinforcing structure 33 is pressed into the working surface 72 by providing a forming unit 71 which comprises a drum having a circular cross-section as described above, and after bringing at least a portion of the machine-facing side 52 of the reinforcing structure 33 into contact with the working surface 72 of the forming unit 71, tensioning the reinforcing structure 33 so that forces are exerted by the reinforcing structure 33 in directions normal to the working surface 72 of the forming unit 7I which press the machine-facing lo side 52 of the reinforcing structure 33 into the working surface 72.
The preferred step of pressing the machine-facing side 52 of the reinforcing structure 33 into the working surface 72 by tensioning the reinforcing structure 33 is indicated in FIGS. 27 and 29 by arrows T. Any suitable means for applying tension can be used. The means used in the process of the present invention are conventional, and are, therefore, not shown in the drawing figures. The amount of tension T applied must be sufficient to cause the working surface 72 to deform and form the desired protrusions 96a. The amount of tension depends at least to some extent on the characteristics of the deformable surface (e.g., the material, thickness, and compressive modulus). Preferably, the amount of tension applied is d~p~oAillIdtely 10 to 20 pounds per lineal inch of the reinforcing structure 33.
The time sequence in which the step of pressing the machine-facing side 52 of the reinforcing structure 33 into the deformable surface 72 (nthe pressing step~) occurs in the process can vary as long as the pressing causes the working surface 72 of the forming unit 7I to form the desired protrusions 96a. The step of pressing the machine-facing side 52 of the reinforcing structure 33 into the deformable surface 72 can occur either before or after the step(s) of applying a coating of liquid photosensitive resin to the reinforcing structure 33. In addition, if the coating is applied in more than one stage, the O 92/00416 PCr/USgl/04258 ~08 step of pressing the machine-facing side 52 of the reinforcing structure 33 into the deformable surface 72 can occur between the stages of applying the coating. The process of the present invention is intended to include all possible a"_., ts and s sequences of the basic steps described herein. Preferably, however, the step of pressing the reinforcing structure 33 takes place in the order shown in the drawings.
As shown in FIGS. 28 and 30, the protrusions 96a formed when the machine-facing side 52 of the reinforcing structure 33 is 0 pressed into the working surface 72 of the forming unit 71 force portions of the coating 70 along the second surface 35' toward the raised portions 120 in the direction of the arrow. In doing so, the protrusions 96a exclude portions of the coatlng 70 from some of the spaces which lie between the plane defined by the machine-facing side of the reinforcing structure Pk2 and the raised portions 120 of the reinforcing structure 33 and also from at least some portions of the interstices 39 of the reinforcing structure 33 to form excluded area 97 in the second surface 35' of the coating 70 which are defined by the protrusions 96a. It is for this reason that the process of the present invention is sometimes referred to as '`resin exclusion casting". As shown in FIGS. 28 and 30, the movement of the protrusions continues until other structural components 40a of the reinforcing structure 33 are encountered. At this point, the protrusions 96a generally conform to the contour of the machine-facing side 52 of the reinforcing structure 33.
Seventh SteD
The seventh step in the process of this invention can be considered as either a single step or as two separate steps, which comprise: (1) proYiding a mask 74 having opaque 74a and transparent regions 74b in which the opaque regions 74a together with the transparent regions 74b define a preselected pattern in the mask; and (2) positioning the mask 74 bet.een t~e coating of W /00416 PCT/US9~/0425~

liquid photosensitive resin 70 and an actinic light source 73 so that the mask 74 is in contacting relation with the first surface 34' of the coating of liquid photosensltive resin 70. The mask 74 can be positioned so that it is positioned a finite distance away from the first surface 34' of the coating 70. Preferably, however, for the reasons described below, it is in contact with the first surface 34' of the coating 70.
The purpose of the mask 74 is to protect or shield certain areas of the liquid photosensitive resin 70 from exposure to light from the acttnic light source. Naturally, if certain areas are sh i el ded, i t fol l ows that certa i n areas are not sh i el ded and that liquid phûtosensitive resin 70 in those unshielded areas will be exposed later to activating light and will be cured. After the steps described herein are p~rru,, ~, the shielded regions will normally comprise the preselected pattern formed by the conduits 36 in the hardened resin framework 32.
The mask 74 can be made from any suitable material which can be provided with opaque regions 74a and transparent regions 74b.
A material in the nature of a flexible photographic film is 2û suitable for use as a mask 74. The flexible film can be polyester, polyethylene, or cellulos~c or any other suitable material. The opaque regions 74a should be opaque to light which will cure the photosensitive liquid resin. For the preferred liquid photosensitive resin used herein, the opaque regions 74a should be opaque to light having a wavelength of between about 20û
and about 4ûO nanometers. The opaque regions 74a can be appl ied to mask 74 by any convenient means such as by a blue printing (or ozal id processes), or by photographic or gravure processes, flexographic processes, or rotary screen printing processes.
3û Preferably, the opaque regions 74b are applied to the mask by a blueprinting (on ozalid) process.
The mask 74 can be an endless loop (the details of which are conventional, and are, therefore, not shown) or it can be supplied WO 92/00416 PCI`/US91/04258 100 ~
l20849~9 from one supply rol l transverse through the system to a takeup roll, neither of which is shown in the ~llustration since they are also conventional. The mask 74 travels in the direction indicated by directional arrow D3, turns under nip roll 81 where it is brought into contact with the surface of liquid photosensitive resin 70, and then travels to mask guide roll 82 in the vicinity of which it is removed from contact with the resin 70. In this partlcular embodiment, the control of the thickness of the resin 70 and the positioning of the mask 74 occur simultaneously.
~ Eiqhth SteD
, The eighth step of the process of this invention comprises curing the unshielded portions of liquid photosensitive resin tn those regions left unprotected by the transparent regions 74b of the mask 74 and leaving the shielded portions uncured by exposing the coating of liquid photosensitive resin 70 to light of an activating wavelength through the mask 74 to form a partially-formed composite belt 10'.
In the embodiment illustrated in FIG. 25, the barrier film 76, the reinforcing structure 33, the liquid photosensitive resin 70, and the mask 74 all form a unit which travels together from nip roll 81 to the vicinity of mask guide roll 82. Intermediate the nip roll 81 and the mask guide roll 82 and positioned at a location where the barrier film 76 and the reinforcing structure 33 are still adjacent the forming unit 71, the liquid photosensitive resin 70 is exposed to light of an act1vating wavelength which is supplied by an exposure lamp 73.
The exposure lamp 73, in general, is selected to provide illumination primarily within the wavelength which causes curing of the liquid photosensitlYe resin 70. That wavelength is a characteristic of the I iqu~d photosensitive resin 70. Any suitable source of illumination, such as mercury arc, pulsed xenon, electrodeless, and fluorescent lamps, can be used. As PCT`/US9~J04258 WO 92~00416 IOl 208.4999, described above, when the 1 iquid photosensitive resin 70 is exposed to light of the appropriate wavelength, curing is induced in the exposed portions of the resin 70. Curing is generally manifested by a solidification of the resin in the exposed areas.
Conversely, the ~ PYposed regions remain fluid.
In addition to inducing the curing of the photosensitive liquid resin 70 in those areas which are unshielded by the transparent regions 74b of the mask 74, as will be seen in conjunction with the description of the figures which follow, in lo this step, exposing the coating of photosensitive resin 70 to light having an activating wavelength also induces the curing of those portions of the liquid photosensitive resin along the second surface 35' of the coating 70 which are defined by the protrusions 96a in the working surface 72 of the forming unit 7~. These portions will then be cured into a shape defined by the protrusions. The portions cured into the shape defined by the protrusions will comprise the passageways 37 and surface texture irregularit~es 38 in the backside network 35a of the second surface 35 of the resinous framework 32.
The intensity of the illumination and its duration depend upon the degree of curing required in the exposed areas. The absolute va~ues of the exposure intensity and time depend upon the chemical nature of the resin, its photo characteristics, the thickness of the resin coating, and the pattern selected. For the preferred resin, Merigraph resin EPD 1616, this amount ranges from approximately 100 to approximately 1,000 millijoules/cm2, with the preferred range being between approximately 300 and approximately 800 mill i joules/cm2, and the most preferred range being between approximately 500 and approximately 800 mi 11 i joul es/cm2 .
The intensity of the exposure and the angle of incidence of the l ight can have an important effect on the presence or absence of taper in the walls 44 of the conduits 36. In addition to WO 92/004t6 ~CI/US91/04258 -, 49,9~9 102 ~
having an effect on the tapering of the walls 44 of the conduits 36, the intensity of the exposure and the angle of incidence of the light will affect the permeability of the hardened framework 32 to air. This permeability to air ("air permeabilityn) is of importance to the use of the papermaking belt of the present invention in blow-through drying papermaking processes. It is apparent that if there is a high degree of collimation of the light of the activating wavelength, the walls 44 of the conduits 36 will be less tapered. Less tapered (or more nearly vertical) o conduit wall~s will provide the papermaking belt with a higher air permeability than inwardly tapered walls (for a given first surface knuckle area) because the total area of the papermaking belt through which the air can flow is greater when the walls 44 of the conduits 36 are not tapered inwardly.
In the preferred embodiment of the present i~vention, the angle of incidence of the light is colllmated to better cure the photosensitive resin in the desired areas, and to obtain the desired angle of taper in the walls 44 of the finished papermaking belt. Other means of controlling the direction and intensity of the curing rad~ation, include means which employ refractive devices (i.e., lenses), and reflective devices (i.e., mirrors).
The preferred embodiment of the present invention employs a subtractive collimator (i.e., an angular distribution filter or a collimator which filters or blocks UV light rays in directions other than those desired). Any suitable device can be used as a subtractive collimator. A dark colored, preferably black, metal device formed in the shape of a series of channels through which light directed in the desired direction may pass is preferred. In the preferred embodiment of the present invention, the collimator is of such dimensions that it transmits light so the resin network when cured has a projected surface area of 35% on the topside of the papermaking belt, and 65% on the backside.
N i nth Ste~

WO 92/00416 PCr/US91~04258 103 2~8~9g The ninth step in the process in the present invention is removing substantially all of the uncured liquid photosensitiYe resin from the partially-formed composite belt 10' to leave a hardened resin framework 32 around at least a portion of the reinforcing structure 33.
In this step, the resin which has been shielded from exposure to light is removed from the partially-formed composite belt 10' in the manner described below to provide the framework 32 with a plurality of conduits 36 in those regions which were shielded from the l ight rays by the opaque regions 74a of the mask 74 and passageways 37 that provide surface texture irregularities 38 in the backside network 35b of the framework 32 corresponding to the places where the second surface 35' of the coating penetrated 70 was defined by the protrusions 96a in the working surface 72 of the forming unit 71.
In the: '~'i~ t shown in FIG. 25, at a point in the vicinity of the mask guide roll 82, the mask 74 and the barrier f~lm 76 are physically separated from the partially-formed composite belt 10' which comprises the reinforcing structure 33 and the now partly-cured resin 70, along with a certain amount of uncured resin. The composite of the reinforcing structure 33 and the partly cured resin 70a travels to the vicinity of the first resin removal shoe 83a. A vacuum is applied to one side of the composite belt 10' at the first resin removal shoe 83a so that a substantial quantity of the uncured liquid photosensitive resin is removed from the composite belt 10'.
As the composite belt 10' travels farther, it is brought into the vicinity of resin wash shower 84 and resin wash station drain 85 at which point the composite belt 10' is thoroughly washed with . 30 water or other suitable liquid to remove essentially all of the remaining uncured liquid photosensitive resin which is discharged from the system through resin wash stat~on drain 85. At the second resin removal shoe 83b, any residual wash liquid and WO 92/OW16 PCr/US91/042S8 o~4999 104 ~
uncured liquid resin is removed from the composite belt 10' by the application of vacuum. At this point, the composite belt 10' now comprises the reinforcing structure 33 and the associated hardened resin framework 32 and represents the papermaking belt 10 which is the product of this process.
Optionally, and preferably, as shown in FIG. 25, there can be a second exposure of the resin to activating light (hereinafter sometimes referred to as the "post-cure step") so as to complete the curing of the resin and to increase the hardness and lo durability of the cured resin framework 32. The post-cure step takes place ?t the place designated by the reference to the following FIG. 26. FIG. 26 is an enlarged schematic representation of this post-cure step.
As shown in FIG. 26, the composite belt IO' is subjected to a second exposure of light of the activating wavelength by post cure UV light source 73a. This second exposure, however, takes place when the composite belt 10' is submerged under water 86. In order to submerge the composite belt IO', as shown in FIG. 26, the composite belt IO' is diverted somewhat from the path it had been traveling along by rollers 87a, 87b, 87c, and 87d ~nto the water 86 provided by water bath 88. It has been found that it is important that the composite belt 10' be submerged for this post-cure exposure; otherwise, the finished belt IO will be inordinately st~cky or tacky. In addition, it has also been found necessary to add Sodium Sulfite ~Na2 503) to remove as much of the dissolved Oxygen from the water as possible to aid in the complete polymerization of the resin. Sodium Sulfite is added in the approximate amount of 2X or less by weight of the water in the post cure water bath 88.
In addition, FIG. 26 shows that a mirror 89 is placed on the bottom surface 90 of the water bath 88 in this post-cure process.
The mirror 89 serves to reflect the UV light which reaches the wo 92/00416 PcrJl~sst~o42~8 loS 2 0 8 4 99 9 mirror 89 back onto the underside or backside 12 of the composite belt 10'. This step is particularly important in fully curing the portion of the resin which forms the passageways and irregularities in the backside network 35a of the second surface s 35 of the framework 32 of the finished papermaking belt 10. As shown in the preceding figure, all of the UV light has been supplied from sources located above the top side of the composite belt 10'. The amount of UY light which is supplied during this post-cure process, again is dependent upon the particular resin involved, as well as the depth and pattern of curing desired. For the preferred resin, Merigraph resin EPD 1616, the dosages specified above for the pre-cure step are also suitable for the post-cure step. It is not necessary, however, to collimate the light in the post-cure stage because the conduits or channels have already been suitably formed in the framework.
The process continues until such time as the entire length of retnforcing structure 33 has been treated and converted into the papermaking belt 10 Should it be desired to construct a papermaking belt having different patterns superimposed one on another or having patterns of different thicknesses, the reinforcing structure can be subjected to multiple passes through the process. Multiple passes through the process of this invention can also be used to construct papermaking belts of relativelr great thickness.
3. The PAnermakinq Process The papermaking process which util izes the improved papermaking belt 10 of the present invention is described below, although it is contemplated that other processes may also be used to make the paper products described herein. 8y way of ` 30 background, a process for making paper which does not include the Im ,~-~ ts of the present process or utilize the improved papermaking belt 10 of the present invention is set out in detail 106 208~99g .
in U.S. Patent 4,529,480, entitled "Tissue Paper"
which issued to Paul D. Trokhan on July 16, 1985.
The; __..v~ -ts to the proceas described in the Trokhan patent are provided below.

The overall papermaking process which uses the papermaking belt of the present invention comprises a number of steps or operations which occur in the general time sequence as noted below, In the following paragraphs, each step will be discussed o in detail in reference to FIG. 1. It is to be understood, however~ tha=t the steps described below are intended to assist the reader in understanding the process of the present inventicn, and that the invention is not limited to processes with only a certain number or ~ .., t of steps. In th~s reg~rd, it is noted that it is possible to combine the following steps so that they are p~. ru. i ,~ ly. Likewise, it is possible to sep~rate the following steps into two or more steps without departing from the scope of this invention.
flG. l is a simplified, schematic representation of one zo embodiment of a continuous papermaking machine useful in the pract1ce of the paperm~king process of the present invention. The papermaking belt 10 of the pres~nt invention is shown in the form of an endless belt. The particular papermaking machine illustrated in FIG. 1 is a Fourdrinier wire machine which is generally similar in configuration and in the ar, r, t of its belts to the paperm~king machine disclosed in U.S. Patent No.
3,301,746, issued to Sanford and Sisson on ~January 31, 1967.
It is al60 contemplated that the twin wire pap~ k; n~ machine illustrated in FIG . 1 of tl . S .
Patent No. g,102,737, issued to Morton on July 25, 1978 could be used to practice the present invention.
I~ the twin wire p~r~ =k;ng ~achine disclosed in U . S . Patent B

~07 2084g99
4 102.73~. Morton is used to practice the present invention the p~permaking belt of the present invention would replace the drying/imprinting fabric represented by reference numeral ~ in the drawing figures of the Morton patent. All remaining references to drawing figures however will be to the drawings which accompany the present spec1fication.
First SteD
The first step in the practice of the papermaking process of the present invention is the providing of an aqueous dispersion o of papermaking fibers 14.
The equipment for preparing the aqueous dispersion of papermak1ng fibers 14 is well-known and is therefore not shown in flG. 1. The aqueous dispersion of paperm~k1ng f1bers 14 is provided to ~ headbox 13. A s1ngle he~tbox is shown in FIG. 1.
However ~t is to be understood th-t there may be multiple h~h^Yo in ~ltern~t~ve a, . _ ls of the papermaking process of the present invent~on. The headbox(es) and the equipment for prepar~ng the aqueous dispersion of p~permak1ng fibers are prefer~bly of the type d~sclosed in U.S. Patent No. 3 994 771 issued to Morg~n and R~ch on November 30 1976 which is incorporated by reference herein. The preparat10n of the aqueous dispers~on ~nd the characteristics of the aqueous d1spersion are descr~bed in gre~ter det~il in U.S. Patent 4 529 48û issued to Trokh~n on July 16 1985.

The ~queous d1spersion of paperm~king f~bers 14 supplied by the he~dbox 13 is del ~vered to ~ forming belt such as the fourdrin~er wire 15 for c~rrying out the second step of the paperm~king process. The fourdr~n~er wire 15 ~s supported by a bre~st roll 16 and ~ plur~lity of return rolls design~ted 17 ~nd 17~. The fourdrinier wire 15 is propelled in the direction 1ndic~ted by direction~l arrow A by a conventional drive means B

WO 92/00416 PCI~/US91~04258 ,~ 108 ~~ which is not shown in FIG 1. There may also be associated with the papermaking machine shown in FIG. 1 optional auxiliary units and devices which are commonly associated with papermaking machines and with fourdrinier wires, including forming boards, hydrofoils, vacuum boxes, tension rolls, support rolls, wire cleaning showers, and the like, which are conventional, and are, therefore, also not shown in FIG. 1.
Second Step The second step in the papermaking process is forming an embryon~c web 18 of papermaking fibers on a foraminous surface from the aqueous dispersion 14 supplied in the f~rst step. The Fourdrinier wire 15 serves as the foraminous surface in the papermaking machine shown in FIG. 1. As used herein, the embryonic web is the web of fibers which is subjected to redr, 1.~3 t on the papermaking belt 10 of the present ~nvention during the course of the papermaking process.
.

The characterist~cs of the embryonic web 18 and the various possible techniques for forming the embryonic web 18 are described in U.S. Patent 4,529,480 which is incorporated by reference herein. In the case of the process shown in FIG. 1, the embryonic web 18 is formed from the aqueous dispers~on of papermaking fibers 14 between breast roll 16 and return roll 17 by depositing the aqueous dispers~on 14 onto the Fourdrinier wire 15, and removing a portion of the aqueous dispersing medium. Convent~onal vacuum boxes, forming boards, hydrofoils, and the like which are not shown in FIG. 1 are useful in effecting the removal of water from the aqueous dispersion 14.
After the embryonic web 18 is formed, it travels with Fourdrinier wire 15-about the return roll 17 and is brought into the proximity of a second papermaking belt, the papermaking belt 10 of the present invent~on.

WO 921004t6 PCl-/US91~04258 2~;8~999 Th i rd SteD
The third step in the papermaking process is contacting (or associating) the embryonic web 18 with the paper-contacting side 11 of the papermaking belt 10 of the present invention.
The purpose of this third step is to bring the embryonic web 18 into contact with the paper-contacting side of the papermaking belt 10 on which the embryonic web 18, and the individual fibers therein, will be subsequently deflected, rearranged, and further dewatered. The embryonic web 18 is brought into contact with the lo papermaking belt 10 of the present inYention by the Fourdrinier wire 15. The Fourdrinier wire 15 brings the embryonic web 18 into contact with, and transfers the embryonic web 18 to the papermaking belt 10 of the present invention in the vicinity of vacuum pickup shoe 24a.
In the embodiment illustrated in FIG. 1, the papermaking belt 10 of the present invention travels in the direction indicated by directional arrow B. The papermaking belt 10 passes around the papermaking belt return rolls 19a ang 19b, ~mpression nip roll 20, papermaking belt return rolls 19c, 19d, 19e and 19f, and emulsion distributing roll 21 (which distributes an emulsion 22 onto the papermaking belt 10 from an emulsion bath 23). The loop that the papermaking belt 10 of the present invention travels around also includes a means for applying a fluid pressure differential to the paper web, which in the preferred embodiment of the present invention, comprises vacuum pickup shoe 24a and a vacuum box such as multislot vacuum box 24. Also on the loop is a predryer 26.
In addition, in between papermaking belt return rolls 19c and 19d, and also in between papermaking belt return rolls 19d and 19e, are water showers 102 and 102a, respectively. The purpose of the water showers 102 and 102a is to clean the papermaking belt 10 of any paper fibers, adhesives, and the like, which remain attached to the section of the papermaking belt 10 which has traveled through the final step ~n the papermaking process. Associated .

' ? .' ;~, f.' 110 20849~ with the papermaking belt 10 of the present invention, ~nd also not shown in FiG. 1 are various additional support rolls, return ro~ls, cleaning means, drive means, and the like commonly used in papermaking machines and all well known to those skilled in the art .
The function of the emulsion distributing roll 21 and emulsion bath 23 wil~ be discussed in con,funct~on wfth the third step for convenience. The emulsion distributing roll 21 and the emulsion bath 23 continuously apply an effective amount of a o chemical compound (or compoundsl to the belt 10 during the papermaking process. The chemical compounds can be applied to the papermaking belt 10 at any po~nt during the papermaking process, al though i t i s preferred the chemical s be added to the paper-contact~ng side ll of the belt 10 at a particular point in the belt's revolution whQn the belt 10 is not carrying a paper web. This norma11y will be after (as will be described more fully herein) the predried paper web 27 has been Lr~.~sr~,., i off the papermaking belt 10 to the surface of the Yankee dryer drum 28 and the belt lO is returning to contact another embryonic web 18 (~.e., in the vicinity of emulsion dlstribution ro11 21).
The chemical compound or compounds are preferably applied to the papermaking belt 10 in the form of an emulsion, such as by emulsfon 22 shown in FIG. 1. These compound(s) serve the dual purpose of: (I) acting as a release agent, or release emulsion (a coating on the papermaking belt 10 of the present invention so the paper releases from and does not stick to the belt after the steps of the papermaking process have been performed on the paper web);
and, (2) treattng the belt to extend its useful life by reducing the tendency of the resinous framework 32 to degrade due to oxidation (that is, the emulsion 22 also serves as an ant~oxidant). Preferably, the chemical compound(s) are applfed uniformly to the paper-contacting side 11 of the be~t 10 so substantially the entire paper-contacting side 1I benefits from the chemical treatment.

WO 9~/00416 PCI/US91/04258 111 ~1~84999 The preferred emulsion 22 is primarily comprised of five compounds, although it is contemplated that other or additionil suitable compounds could be used. The preferred composition contains water, a high-speed turbine oil known as "Regal Oil", Dimethyl distearyl ammoniumchloride, cetyl alcohol, and an ant i oxi dant .
As used herein, the term "Regal Oil" refers to the compound which is comprised of approximately 87X saturated hydrocarbons and approximately 12.6% aromatic hydrocarbons with traces of additives, which is manufactured as product number R ~ 0 68 Code 702 by the Texaco Oil Company of Houston, Texas. The purpose of the Regal Oil in the composition described above is to provide the emulsion with properties which allow it to act as a release agent.
Dimethyl distearyl ammoniumchloride is sold under the tradename ADOGEN TA 100 by the Sherex Chemical Company, Inc., of Rolling Meadows, Illinois. Hereinafter, Dimethyl distearyl ammoniumchloride will be referred to as ADOGEN for convenience.
ADOGEN is used in the emulsion as a surfactant to emulsify or stabilize the oil particles (of the Regal Oil) in the water. As referred to herein, the term "surfactant" refers to a surface active agent, one end of which is hydrophilic, and the other end of which is hydrophobic, which migrates to the interface between a hydrophilic substance and a hydrophobic substance to stabilize the two substances.
As used herein, "cetyl alcohol" refers to a C16 linear fatty alcohol. Cetyl alcohol is manufactured by The Procter ~ Gamble Company of Cincinnati, Ohio. Cetyl Alcohol, like ADOGEN is used as a surfactant in the emulsion utilized in the present invention.
As used herein, the term "antioxidant" refers to a compound, which when applied to the surface of an article, the surface of which is sub~ect to oxidation, reduces the article's tendency to oxidize (i.e., combine with oxygen). In particular, in this WO 92tO0416 . PCI'/US91/~4258 2~8~9~9 specification, the term "antioxidant" refers to compounds which reduce the tendency of the cured resin network of i:he papermaking belt I0 of the present invention to oxidize. A preferred antioxidant is Cyanox 1790 which can be purchased from American Cyanamid of Wayne, New Jersey 07470.
The r~elative percentages of the compounds as used in the emulsion~ are set out in the following table:
Component Volume l/eight ~qal . ) ~ l bs . ) Water 518 4,320.0 REGAL OIL 55 421.8 ADOGEN N/A* 24 Cetyl Al cohol N/A* 16 Cyanox 1790 N/A* 5 . 8 * N/A - Component is added in solid form Fourth Step The fourth step in the papermaking process inYolves applying a fluid pressure differential of a suitable fluid to the embryonic web 18 with a vacuum source to deflect at least a portion of the papermaking fibers in the embryonic web 18 into the conduits 36 of the papermaking belt 10 and to remove water from the embryonic web 18 through the conduits 36 to form an intermediate web 25 of papermaking fibers. The deflection also serves to rearrange the 0 fibers in the embryonic web 18 into the desired structure.
The preferred method of apply~ng a fluid pressure differential (or "differential fluid pressuren), as wil~ also be more fully described herein, is by disposing the embryonic web 18 jn such a way that the web is exposed to the vacuu~ through the conduits 36 by the appl ication of vacuum from the backside 12 of the papermaking belt 10 of the present invention. In FIG. I, this USgl/0425 WO 92/00416 Pcr~
~ 113 208~999 preferred method is illustrated by the use of vacuum pickup shoe 24a and the multislot vacuum box 24. Preferably, a vacuum pressure of between approximately 8 and 12 inches (20.32 cm and 30.48 cm) of mercury is applied at the vacuum pickup shoe 24a and a vacuum pressure of between approximately 15 and 20 inches (38.1 cm and 50.8 cm) of mercury is applied at the multislot vacuum box 24. In the preferred embodiment of the present process, therefore, the fluid pressure differential will typically be a negat~ve pressure (i.e., less than atmospheric pressure), and the suitable fluid is air. Alternatively, or additionally, positive pressure in the form of air or steam pressure can be appl ied through Fourdrinier wire 15 to the embryonic web 18 in the vicinity of pickup shoe 24a or vacuum box Z4. The means for applying such a positive pressure are conventional, and are, therefore, not shown in FIG. 1.
the deflection of the fibers into the conduits 36 is illustrated in FIGS. IA and 18. FIG. lA is a simplified representation of a cross-section of a portion of a papermaking belt 10 and embryonic web 18 after the embryonic web 18 has been associated with the papermaking belt 10, but before the deflection of the fibers into conduits 36 occurs. As shown in FIG lA, the embryonic web 18 is still in contact with the Fourdrinier wire 15 (or more specifically, sandwiched between the Fourdrinier wire 15 and the papermaking belt 10 of the present invention). In FlG.
lA, only one conduit 36 is shown and the embryonic web 18 is shown associated with the paper side network surface 34a of the r. .k 32 papermaking belt 10.
The portion of the papermaking belt depicted in FIGS. lA and 18 has been simplified by omitting the reinforcing structure which is generally part of the preferred embodiment of the papermaking belt of the present invention, and also by showing the walls 44 of the conduits 36 as straight vertical lines in cross-section, when in the preferred - -ii -t of the present invention as described above, the profile of the walls 44 of the conduits is somewhat WO 92/00416 PCllUS91/04258 , more complex. In additton, the opening of conduit 36 in the f~rst 84999 surface 34, first conduit opening 42, and its opening in second surface 35, second conduit opening 43 are shown essentially equal 1n size and shape when in the preferred embodiment of the present lnvention the openings of the conduits 1n the second surface 35 w1~1 be smaller than the openings of the conduits in the first surface 34 of the framework 32.
FIG. lB, like FIG. IA, is a simplified cross-sectional Yiew of a portion of the papermaking belt 10. This v1ew, howeYer, illustrates the transformation of the embryon1c web 18 into intermediate web 25 by the deflect10n of the fibers of the embryonic web 18 into the conduit 36 under the appl ication of a fluid pressure d1fferential. fIG. lB shows that a substantial port~on of the fibers in embryonic web 18 and, thus, embryonic web 18 itself, has been displaced into the conduit 36 below the paper s1de network surface 34a into condu1t 36 to form the intermediate web 25. Rear, ~, t of the individual fibers 1n ~embryonic web 18 (the details of which are not shown) occurs dur1ng deflection.
FIG lB also shows that at the po1nt when the ~ibers in the embryonic web lB have been deflected into the conduit 36 and rearranged, the embryonic web 18 is no longer in contact with the Fourdrinier wire 15. As shown in FIG. 1, the web 18 becomes separated from the Fourdrinier wire l5 immediately after leaving the vic1nity of the pickup shoe 24a.
Either at the time the fibers are def~ected into the conduits 36 or after such deflection occurs, water is removed from the embryonic web 18 through the conduits 36. Water removal occurs under the action of the fluid pressure different1al. lt is important, however, that there be essent1ally no water removal from the embryonic web 18 prior to the deflection of the fibers 1nto the conduits 36. As an aid 1n achieving this condit10n, at least those portions of the conduits 36 511l l uL~Id~d by the paper s1de network 34a, are generally isolated from one another. This WO 92~00416 PCI~/US91/04258 11S 208~999 t` .~
1solation, or compartmentalization, of conduits 36 is of importance to ~nsure that the force causing the deflectlon, such as an applied vacuum, is applied relative~y suddenly and in a sufficient amount to cause deflection of the fibers. This is to be contrasted with the situation in which the conduits 36 are not isolated. In this latter situation, vacuum will encroach from adjacent conduits 36 which will result in a gradual application of the vacuum and the removal of water without the accompanying deflection of the fibers.
In the machine illustrated in FIG. I, water removal initially occurs at the pickup shoe 24a and vacuum box 24. Since the conduits 36 are open through the thickness of a papermaking belt 10, water withdrawn from the embryonic web 18 passes through the conduits 36 and out of the system. Water removal continues until the consistency of the web associated with conduits 36 is 1ncreased to from about 20% to about 35%.
Fifth SteD
The fifth step is traveling the papermaking belt I0 and the embryonic web 18 over the vacuum source described in the forth step. Preferably, the fifth step will occur while the fourth step is taking place. The belt lO carries the embryonic web 18 on its paper-contacting side 11 over the vacuum source. At least a portion of the textured backside 12 of the belt lO is generally in contact with the surface of the vacuum source as the belt lO
travels over the Yacuum source.
The step of traveling the papermaking belt lO of the present inYention over the vacuum source reduces the undesirable accumulation of paper fibers on the vacuum box lips. ~Jhile not wishing to be bound by any particular theory, it is believed that one of the keys in achieving this reduction in the process of the present invention is controlling the relative suddern~ss of the deflection during the preceding step. The deflection of the fibers is controlled by using a papermaking belt which has a .

.

WO 92/00416 PCr/l~ssl/042~8 - ' 116 ~
2Q84999 textured backside 12. The textured backside surface allows a certain amount of air to enter across the backside 12 of the papermaking belt 10 when the backs~de 12 is in contact w1th the surfaces of the pickup shoe 24a and the vacuum box 24. The backside network 35a of the be1t 10 has passageways 37 which provide spaces through which at least some of the this air can enter. This is to be contrasted with the prior deflection member which was provided with bottom surface which was relat1vely pl anar. The pl anar surface tended to form a seal on the vacuum lo box used to deflect the fibers of the embryonic web, resulting in an extremely sudden appl icat10n of vacuum pressure when the seal was broken. Thus, controlling the deflection of the fibers in the embryonic web 18 may be a step which inherently occurs in conjunction with the fifth step, or it may be considered to be a separate step.
It is also believed that these passageways 37, which provide surface texture irregularities 38 in the backs1de 12 of the papermaking belt 10 have a cleaning effect on the lips or surfaces of the vacuum dewatering equipment used in the papermaking process. This cleaning action tends to remove any undesirable accumulation of papermaking fibers on this vacuum equipment. This cleaning actton is believed to occur when the vacuum source has at least one surface that the papermaking belt travels over during the deflect10n step. Thus, the cleaning of the surfaces of the vacuum dewatering equipment may be a step which inherently occurs 1n conjunction with`the fifth step, or it may be considered to be a separate step. If considered as an add1tional step, this step would comprise contact1ng the surface of said vacuum source with the textured backside 12 of the belt 10 to clean off any papermaking fibers which have accumulated on the surface of said vacuum source.
Following the application of the vacuum pressure and the traveling of the papermaking belt 10 and the embryonic web 18 over the vacuum source, the embryonic web 18 is in a state in which it has been sub~ected to a fluid pressure d1fferent1al and deflected WO 92/00416 PCr/US91/0425g 117 20849gg . , . ~, ,, but not ful ly dewatered, thus i t i s now referred to as the aintermediate web 25."
Sixth SteD
The sixth step in the papermaking process is an optional step which comprises drying the intermediate web Z5 to form a predried web of papermaking fibers. Any convenient means conventionally known in the papermaking art can be used to dry the intermediate web 25. For example, flow-through dryers, nonthermal, capillary dewatering devices, and Yankee dryers, alone and in combination, are satisfactory.
A p~ ~r~ i method of drying the intermediate web 25 is illustrated in FIG. 1. After leaving the vicinity of vacuum box 24, the intermediate web 25, which is associated with the papermaking belt 10, passes around the papermaking belt return roll 19a and travels in the direction indicated by directional arrow B. The intermediate web 25 then passes through optional predryer 26. This predryer 26 can be a conventional flow-through dryer (hot air dryer) well known to those skilled in the art.
The quant~ty of water removed in predryer 26 is controlled so that predried web 27 exiting the predryer 26 has a consistency of from about 30X to about 98X. Predried web 27, which is still associated with the papermaking belt 10, passes around papermaking belt return roll 19b and travels to the region of impression nip rol l 20 .
Seventh SteD
The seventh step in the papermaking process is impressing the paper side network 34a of the papermaking belt 10 of the present invention into the predried web by interposing the predried web 27 between the papermaking belt 10 and an impression surface to form an imprinted web of papermaking fibers.

WO 92/00416 PCI'/US91/04258 2~49~9 If the intermediate web 25 was not subjected to the optional sixth predrying step, this seventh step will be performed on the intermediate web 25.
The seventh step is carried out in the machine illustrated in FIG. 1 when the predried web 27 then passes through the nip formed between the impression nip roll 20 and the Yankee drier drum 28.
As the predried web 27 passes through this nip, the network pattern formed by the paper side network 34a on the paper-contacting side 11 of the papermaking belt 10 is impressed into predried web 27 to form imprinted web 29.
Eiqhth SteD
The eighth step in the papermaking process is drying the ~mprinted web 29. The imprinted web 29 separates from the papermaking belt 10 of the present invent~on after the paper side network 34a is impressed into the web to from imprinted web 29.
As the imprinted web 29 separates from the papermaking belt 10 of the present invention, it is adhered to the surface of Yankee dryer drum 28 where it is dried to a consistency of at least about 95% .
The section of the belt 10 which has been carrying the web passes around papermaking belt 10 return rolls 19c, 19d, 19e, and l9f and through showers 102 and 102a located therebetween where it is cleaned. From the showers, the section of the belt moves on to the emulsion roll 21 where it receives another application of emulsion 22 prior to contacting another portion of the embryonic web 18.
Ninth SteD
The ninth step in the papermaking process is the foreshortening of the dried web (imprinted web 29). This ninth step is an optional, but highly preferred, step.

As used herein, foreshortening refers to the reduction in length of ~ dry paper web which occurs when energy is ~pplied to the dry web in such a way that the length of the web is reduced and the fibers in the web are rearranged with an accompanying disruption of fiber-fiber bonds. Foreshortening can be accomplished in any of several well-known ways. The most common.
and preferred, method is creping.
In the creping operation, the dried web 2g is adhered to a surface and then removed from that surface with a doctor blade 30.
o As shown in FIG. 1, the surface to which the web is usually adhered also functions as a drying surface. Typically, this surface is the surface of a Yankee dryer drum 28 as shown in FIG.
1.
The ~ -r~n;~ of the imprinted web 29 to the surface of Yankee dryer drum 28 is facilitated by the use of a creping adhesive, Typical creping ~dhesives can include any suitable glue, such as those based on polyYinyl alcohol. Specific examples of suitable adhesives are described in U.S. Pat. No. 3,926,716 i ssued to B~tes on December 16, 1975 .
The adhesive is applied either to predried web 27 immediately prior to its passage through the above described nip, or more preferably to the surface of Yankee dryer drum 28 prior to the point at which the web is pressed against the surface of Yankee dryer drum 28 by the impression nip roll 20. The p~rticular means of glue appl ication and the technique for applying the glue used in the practice of the present invention are convention~l, and are, therefore. now shown in FIG. 1. Any technique for applying the creping adhesives known to those skilled in the art, such as spraying, can be used.
In gener~l, only the nondeflected portions of the web 29 which h~ve been associated with paper side network 34a on the paper-contacting side 11 of the papermaking belt 10 are directly adhered to the surface of Yankee dryer drum 28. The pattern of the paper side 34a network and its orientation relative to the B

120 2~8~g99 doctor blade 30 will in major part dictate the extent and the character of the creping imparted to the web.
The physical characteristics of the paper weo 31 which is made by the process of the present invention are described in the aforementioned U.S. Patent 4,529,480 entitled ~Tissue Paper", which issued to Trokhan on July 16, 1985.
The network regi on and the plurality of domes in the paper web 31, however, will be formed into l inear Idaho pattern" rather than in the hexagon pattern lo shown in the drawings of U.S. Patent 4,5Z9,480 due to the difference in the shape of conduits in the preferred embodiment of the papermaking belt 10 of the present invention.
The paper web 31, which is the product of this invention, can be optionally calendered and is either rewound with or without differential speed rewinding or is cut and stacked all by conventional means which are not illustrated in FIG. 1. The paper web 31 is then ready for use.
4. Test Methods It has been found that belts with a certain amount of zo backside texture will achieve the desired goals of reducing the undesirable accumulation of paper fibers on the surfaces of the vacuum dewatering equipment and controlling the other problems associated with the fiber accumul~tion. The amount and character of backside texturing which must be present for the desired re5ults to be obtained when using the papermaking belt 10 of the present invention is a quality of the belt which is referred to as the fluid passage capacity of the belt, or more particularly. of the textured backside surface 12 of the belt. As used herein, the term "fluid passage capacity~ refers to a measurement of the air which travels (or "air leakage~) across the backside 12 of the papermaking belt 10 under the conditions of the test described below which has been developed for this particular purpose.
B

-WO 92/00416 PCI~/US91~04258 121 208~99~
The air leakage across the backside 12 of the papermaking belt 10 will hereinafter sometimes be referred to as the "X-Y" air leakage. The "X-Y" language is derived from the fact that if the papermaking belt 10 of the present invention were placed in a Cartesian coordinate system with the backside 12 of the papermaking belt 10 lying in the plane formed by the x and y axes, the air leakage which is of interest would be that which passes along the backside 12 surface of the belt 10 in any direct~on in the X-Y plane.
The X-Y or backside air leakage test utilizes a deYice which is depicted schematically in FIGS. 31 and 32. FIG. 31 is a schematic plan view of the top surface of the backside leakage testing device 56. All of the hoses and tubing generally associated with the testing device have been omitted from FIG. 31 for simplicity. These hoses and tubes are best seen in the side view of the device shown in FIG. 32. As shown in these figures, the backside leakage testing device 56 has as its basic components, a stand 57, which includes a first plate 58 having a hole 59 in the center; a smooth round second plate 60 separate from the stand, which can be placed over the hole 5~ in the first plate 58; a liquid-filled vacuum gauge 62; and, a flow meter 63.
In its preferred form, the plate which forms the top of the stand (i.e., the first plate 58) is square, 8 inches by 8 inches (20.32 cm x 20.32 cm), and 1/2 inch (1.27 cm) thick. The first plate 58 provides a flat, nondeformable, and fluid-impervious (i.e., impervious to gases and liquids) surface. It is preferably made of stainless steel with a mirrored finish and an extremely smooth surface. It is particularly important that there be no scratches or other defects on the surface of this plate to obtain accurate readings. Such surface defects will allow additional air leakage to occur which will result in higher readings than if the first plate 58 did not have such defects. The diameter of the hole in the center of this plate is 1.0 inch (2.54 cm). In addition, in the stand used for the test described herein, a WO 92~00416 PCI'/US91/04258 9 circle approximately 3.5 inches (8.89 cm) in diameter is inscribed 20~499 into the first plate 58 which is centered around the hole 59. The purpose of this circle is to provide a guideline for centering the second plate 60 oYer the hole 59. It is not believed that this circle has an effect on the accuracy of the readings.
The round second plate 60 which is not a part of the stand is, in its preferred form, also made of stainless steel, and is 3 ~nches (7.62 cm) in diameter, and 1/2 inch (1.27 cm) thick. The second plate 60 weighs 405 grams. The weight must be sufficient to retain the sample of the belt which is being tested on the stand without unduly compressing the same.
.
As shown in FIG. 32, an adapter 61 fits inside the hole 59 in the first plate 58 so a tube or hose can be inserted ~nto the hole 59 and retained therein. The adapter 61 has a short tube 64 which extends from at least one of ~ts ends. This tube 64 extends toward the open~ng of the hole S9 along the surface of the first plate 58 on which the section of the belt being tested rests. The inside diameter of the tube 64 which extends from the adapter 61 ls 0.312 inches (0.793 cm).
A hose 65a runs from the the other end of the adapter 61 to the botto~ of a flow meter 63. The flow meter 63 is used to measure the rate of air flow through the portion of the papermaking belt 10 being tested. The flow meter 63 has a numbered scale which runs between 0 and lS0. As with most flow meters, no specific untts are ind~cated on the scale. Therefore, as will be described more fully below, the flow meter 63 has been calibrated to some known unit. A suitable flow meter is one which is marked FM 102-05 manufactured by the Cole Parmer Company, Chicago, IL 60648.
Another hose 65b runs from the top of the flow meter 63 to a tube 68 which is ultimately connected to a vacuum source which pulls a vacuum in the direct~on of the arrow VT. The vacuum , .

Wo 92/00416 Pcr/Ussl~04258 123 20849,~9 source itself is conventional, and is, therefore, not shown in FIG. 32. There are seYeral branches of the tube 68 which runs from the hose 65b to the vacuum source . Incl uded on these branches are a shut-off valve 69a, a coarse adjustment va1ve 69b, and a fine adjustment valve 69c, as well as the liquid-filled vacuum gauge 62 which is calibrated for pressures of between O and 30 inches (0-76.2 cm) of mercury. Any gauge which accurately measures vacuum in inches of mercury is suitable. An example of such a vacuum gauge is a model which is marked AISI 316 Tube &
socket No . 250. 2274A manufactured under the trademark Ashcroft Duragauge in Stratford, CT.
In operation, a section of the papermaking belt 10 is placed across the top of the hole S9 in the plate 58 of the X-Y leakage test stand 57. The section of the papermaking belt 10 is placed on the plate 58 with its paper-contacting side 11 up (i.e., facing away from the plate 58) and its backside 12 directly on the plate 58. The section of the papermaking belt 10 should be sufficient in size so that it is at least larger than the round second plate 60 in all dimensions. Only a portion of the piece of the papermaking belt 10 is shown in FlGS. 31 and 32, however, for purposes of illustration. ln addition, it should also be noted that for purposes of illustration, the portion of the papermaking belt 10 shown in these figures has been greatly exaggerated relative to the size of the leakage tester 56.
The second pl ate 60 i s then pl aced on top of the paper-contacting side 11 of the papermaking belt 10 to hold the belt in place and to coYer the conduits 36 of the portion of the papermaking belt 10 being tested to prevent the air from entering through the conduits 36. Vacuum pressure is appl ied and the valves 69a, 69b, and 69c are adjusted so that the pressure differential measured by the vacuum gauge 62 is preset at apu,uxi,,,~.tely 7 inches (1~.78 cm) of mercury. Readings have, however, been taken when the vacuum gauge 62 was preset at 5 inches (12.7 cm) of mercury before a completely standardized WO 92/00416 PCI/US91/042~8 2~8~ procedure was established. The readings taken at 5 inches (12.7 cm) of mercury can be converted to readings taken at 7 inches of mercury by inserting the readings taken at 5 inches (12.7 cm) of mercury into the fo110wing equation where x is the reading taken at 5 inches (12.7 cm) of mercury and y is the corresponding reading at 7 inches (17.7 cm) of mercury:
y - 2.6720 + 1.2361x When vacuum pressure has thus been applied, a direct reading is taken on the flow meter 63. The number which is read directly 0 from the flow meter 63 is a measure of the X-Y 1eakage across the backside 12 of the section of the papermaking belt 10, or more particularly, of the volume of air wh~ch enters around the cir. re~ ce of the second plate 60 (such as in the direction indicated by arrows L) and moves across the backs~de 12 of the section of the papermaking belt 10 being tested. The units of this reading have been named "Marlatts" after Henry Marlatt of Mehoopany, Pennsylvania, an individual responsible for obtaining some of the readings of air leakage using the above-described test. A conversion from Marlatts into standard cubic centimeters/minute can be made by inserting the reading measured in Marlatts into the following equation where x is the reading in Marlatts ~nd y is the CG~ lng value in standard cc/minute:
y - 36 . 085 + 52 . 583x - . 07685x2 .
This equation for converting Marlatts into standard cc/min.
was developed by calibrating the flow meter to standard cc/min.
using a 8uck Optical Soap Bubble Meter. The relationship between the direct readings taken on the flow meter 63 in Marlatts and the corresponding reading in standard cc/min is depicted graphically in FIG. 33.
Preferably, the fluid passage capacity (or amount of air leakage measured using the test described above) should not be WO 9?/OOql6 PCI~/US91/04~58 125 2~8~999 less than about 35 Marlatts (approximately 1,800 standard cc/min.). Belts having a fluid passage capacity of 35 Marlatts begin to achieve some of the benefits of reducing the accumulation of paper fibers in the vacuum dewatering equipment used in the papermaking process. In other words, the passageways 37 in the second surface 35 of the framework 32, together with the other elements which comprise the ba~kside texture, should be sufficient in size, or capacity, to permit at least about 1,800 standard cc/min. of air or other fluid to travel (or escape) across the 0 textured backside surface of the belt when the backside 12 of the belt ~0 is placed in contact with a flat, rD i for",dble, fluid-impervious surface and the conduits 36 are covered to prevent the air or fluid from escaping through the conduits 36, and a fluid pressure differential of approximately 7 inches (17.78 L5 cm) of mercury less than atmospheric pressure is applied to the backside 12 of the belt 10.
The amount of air leakage which is present in papermaking belts which will pe;form at an acceptable level in the papermaking process is an air leakage of generally greater than approximately 40 Marlatts (approximately 2,000 standard cc/min.) at 450-SS0 cfm air permeability, the preferred minimum range of air permeabilities for the composite belt. Preferably, a belt should have an air leakage reading of at least approximately 70 Marlatts (approximately 3,300 standard cc/min.), and most preferably, the belt should have an air leakage reading of at least approximately 100 Marlatts (approximately 4,500 standard cc/min.) under the same conditions (450-550 cfm air permeability).
The upper limit on the desirable amount of backside texturing is that amount of texturing which would permits the maximum amount of air to travel across the backside 12 of the papermaking belt 10 without the undesirable result of decreasing the vacuum pressure differential below that amount necessary to cause the fibers of the paper web to be deflected into the conduits 36 of the papermaking belt 10. It is believed that this amount could be as ~ . . ,`~ 126 2~9g9 great as 250 Marlatts (approximately 8,400 standard cc/min.), or more .
FIGS. 35A-C are enlarged photographs of an example of a papermaking belt I0 made according to the process of the present lnvention. The photograph of the belt shown in flGS. 35A-C can be compared to the photographs of the prior smooth backsided belt shown in FIGS. 34A and 34 B.
Several matters should be noted when examining the enlarged photographs of these belts. First, ~t should be apparent that due lo to the level of magnificat~on used, the portions of the belts shown in thè photographs are generally very small portions of those belts. The portions of the belts which are shown in the photographs (and particularly the backside texturing on those belts) are bel ieved to be fa~rly representative of the characteristics of the entire belt. Th~s does not mean, however, that sect~ons of the belt which are more representative of the overall characterist~cs of the entire belt than the port~ons of the belts depicted in the photographs, do not exist.
In addition, it should be noted that the port~ons of the belts shown in the photographs will more than likely not correspond identically with the port~ons of the belt shown in the other photographs taken from di fferent angl es due to the difficulty of examining and photographing the minute features of such an art~cle under magnification. In other words, the portions f the belt which form the =paper-contacting side 11 and the backside 12 may not actually 11e directly above and below each other in the belt I0. Likewise, the cross-section photograph of the belt may not be a cross-sect~on of the same portion of the belt shown in the top and bottom side photographs. With this is mind, the enlarged photographs of the belts will now be examined.
FIGS. 34A and 348 are plan view photographs, each enlarged about 25 times actual size, of the paper-contacting side 11a and WO 9~004~6 PCI/US9t~042~;8 ~49g~
the backside 12a, respectively, of a papermaking belt 10a which does not contain the improvements disclosed herein. The belt shown in FIGS. 34A and 34B differs somewhat in dimensions from the belt formed by the process of the present invention because the s belt shown in FIG5. 34A and 34B is a 711 linear Idaho belt. The belt shown in FIGS. 34A and 34B, therefore, has smaller-sized conduits 36, and a greater number of conduits per square inch.
The belt lOa shown in FIGS. 34A and 34B also differs in that it has a monolayer reinforcing structure.
The backside 12a of the belt 10a shown in FIG. 34B shows one of the problems which occurred in casting belts having smaller conduits. The conduits 36 tended to close up on the backside 12a.
Ideally, the backside 12a of the belt 10a in FIG. 34B should appear nearly identical to the paper-contacting side 11a shown in FIG. 33A. If the walls 44 of the conduits 36 are tapered, the openings of the conduits in the backside should appear smaller and the area of the backside network surface should be greater. The departure from the hypothetical ideal belt is also caused partially by minor imperfect~ons in the belt which appear to be greatly exaggerated in these photographs. When backside 12 of the belt IOa shown in FIG. 34B is examined macroscopically, the conduit openings in the backside 12a of the belt lOa appear to be very similar to the conduit openings in the paper-contacting side lla of the belt 10a. However, such an examinat~on of the belt 10a reveals that a very thin film of resinous material covers the conduits which may at least partlally account for the differences ln the appearance of the backside 12a of the belt 10a.
The photographs of the belt 10 shown in FIGS. 35A-C depict a 300 linear Idaho 35% knuckle area belt wh~ch was made in accordance with the process of the present invention. The backside texture of the belt shown in these figures was created by utilizing one of the preferred materials listed above as the deformable, constant volume, casting surface. All of the photographs have been enlarged about 25 times the actual siz~ of ZQ84999 128 ~
the belt 10. FIG. 35A is a photograph of the paper-contacting side 11 of the bel t 10 taken at an angle of approximately 35 degrees relative to an imaginary line drawn normal to the surface of the paper-contacting side (i.e., relative to the z-direction).
S FIG. 35B is a photograph of the backside l2 of the belt 10 shown ln FIG. 35A. FIG. 35C is a sectional view of the belt 10 shown in FIGS. 35A and 35B taken looking in the machine direction.
FIG. 35A shows that the paper side network 34a (upon which the paper web will be carried) is macroscopically monoplanar, o patterned and continuous. The paper side network 34a surrounds and defines the openings 42 of a plurality of conduits 36 into which the fibers in the embryonic web 18 can be deflected and rearranged into the form of the improved paper web. The reinforcing structure 33 can be seen in the holes or openings 41 found by the conduits 36. The reinforcing structure 33 is comprised of a plurality of machine direction warp yarns 53 which are interwoven with a plurality of cross-machine direction weft yarns 54 to leave interstices 39 therebetween. As shown best in FIG. 35C, portions of the structural components 40a (i.e., the warp yarns 53 and the weft yarns 54) which comprise reinforcing component 40 of the reinforcing structure 33 are disposed inward of the plane defined by the machine-facing side of the reinforcing structure Pk2. The reinforcing structure 33 is the preferred multilayer reinforcing structure which has vertically stacked warp yarns 53. As shown in FIG. 35A, the interstices 39 of the reinforcing structure 33 are generally several times smaller than the conduits 36. The reinforcing structure 33 strengthens the framework 32 without interfering with the drainage of water and the passage of air through the conduits 36.
The backside 12 of the belt 10 is shown in FIG. 35B and 35C.
FIGS. 35B and 35C show the backside texturing which is formed by the process of the present invention. As shown in FIGS. 35B and 35C, the backside network 35a is discontinuous. Without the WO 9VO0416 PCI`/US91/042~8 129 2~8~99~
backside texturing formed by the process of the present invention, the backside network 35a would appear very similar to the paper side network 34a. FIG. 35B shows that the backside texturing produced by the process of the present inYention comprises passageways 37 that provide surface texture irregularities 38 in the backside network 35a of the framework 32. The backside network 35a is interrupted by a plurality of discontinuities.
These discontinuities comprise the passageways 37.
FIG. 35C shows some of the general characteristics of the passageways 37 in the backside network 35a of the papermaking belt 10 formed by the process of the present invention. As shown in FIG. 35C, the (heights of the) passageways 37 are disposed inward of the plane defined by the machine-facing side of the reinforcing structure Pk2. In addition, a multiplicity of passageways 37 (have heights which) are disposed between the plane defined by the machine-facing side of the reinforcing structure Pk2 and the raised portions 120 of the structural components 40a. FIG. 35C
also shows that at least a portion of a multlplicity of the passageways 37 are pos~tioned in the interstices 39 of the reinforcing structure 33 (or, at least in the proiected interstitial areas) so that a portion of the projected area of these passageways 37 c~, . e~pOI~ds with a portion of the projected open area of the reinforcing structure 33.
More specifically, when, as shown in FIG. 35C, the reinforcing structure 33 comprises the preferred multilayer woven reinforcing structure having vertically stacked warp yarns 53, the raised portions 120 of the structural components 40a are generally formed by those portions of the warp yarns 53 and the weft yarns 54 which lie in the machine-facing side 52 of the reinforcing structure 33 between the machine side knuckles lO5b.
The inwardly-spaced raised portions 120' are formed by the warp yarns 53 in the second warp l~yer D. The points 53' which form WO 92/00416 Pcr/US9VO4258 '' ' 130 ~4999 the bottom of these warp yarns 53 form a surface, the "raised ? surfacen, which defines a plane Pr.
FIG. 35C shows that the portions of the passageways 37 which are positioned in the interstices 39 of the reinforcing structure
5 33 are positloned predominately between the plane defined by the machine-facing side of the reinforcing structure Pk2 and the plane Pr defined by the (inwardly-spaced raised portions which form the raised surface. It is believed that these passageways 37 are so positioned because at least in the particular belt shown, the raised surface formed by the bottoms of these warp yarns 53 preYents the protrusions 96a of the deformable surface 72 from deforming further inward into the machine-facing side 52 of the reinforcing structure 33 and thereby excluding resin from other portions of the interstlces 39.
FIG. 35C also shows that some of the passageways 37 appear to be located under the raised portions lZ0 formed by the weft yarns, such as weft yarn ~54. These passageways, designated 37' ', are generally triangular-shaped in the cross-sectlon shown in FIG.
35C. The width of these passageways 37" extends from the knuckl es 10Sb2 formed by the weft yarns 54 to the adjacent warp yarns 53. In other words, these passageways 37'' are located in portions of the projected weft areas. More particularly, the passageways 37'' fall in those parts of the projected weft areas th?t are between the machine side weft knuckles 10Sb2 and the adjacent warp yarns 53 in the second warp layer D. The heights of these particular passageways 37'' extends inward to the raised portions 120 defined by the weft yarns 54. The passageways 37 and 37' ' are thus distributed fairly regularly and in a general pattern .
While particular embodiments of the present invention have been illustrated and described, it would be obvious to those skilled in the art that various other changes and modifications can be made without departing from the spirit and scope of the US91~04258 Wo 9~/00416 Pcr/
131 2Q8499~
invention. lt is therefore intended to cover in the appended Claims all such changes and modifications that are within the scope of this invention.
What is claimed is:

~ . ,.. _,

Claims (22)

THE EMBODIMENTS OF THE INVENTION IN WHICH AN EXCLUSIVE
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A papermaking belt having a paper-contacting side and a textured backside opposite said paper-contacting side, said papermaking belt comprising:
a framework having a first surface defining said paper-contacting side of said belt, a second surface opposite said first surface, and conduits extending between said first surface and said second surface, said first surface having a paper side network defining said conduits, said second surface having a backside network with passageways, distinct from said conduits, that provide surface texture irregularities in said backside network;
a reinforcing structure positioned between said first surface and at least a portion of said second surface, said reinforcing structure having a paper-facing side, a machine-facing side opposite said paper-facing side, interstices, a reinforcing component comprised of a plurality of structural components, a projected open area defined by the projection of the areas defined by said interstices, and a projected reinforcing area defined by the projection of said reinforcing component, wherein portions of some of said structural components are disposed inward of the plane defined by the machine-facing side of said reinforcing structure to form raised portions; and said passageways are disposed inward of the plane defined by the machine-facing side of said reinforcing structure, and a multiplicity of passageways are disposed between the plane defined by said machine-facing side of said reinforcing structure and said raised portions of said structural components, and said backside surface has sufficient fluid passage capacity to permit at least about 1,800 standard cubic centimeters/minute of air to escape across said textured surface.
2. The papermaking belt of Claim 1 wherein at least portions of a multiplicity of said passageways are positioned in said interstices so that a portion of the projected area of said passageways corresponds with a portion of the projected open area of said reinforcing structure.
3. The papermaking belt of Claim 2 wherein said reinforcing structure comprises a woven element having structural components comprising a plurality of machine-direction warp yarns interwoven with a plurality of cross-machine direction weft yarns to form said interstices between said warp yarns and said weft yarns, paper side knuckles at those locations where said warp yarns and said weft yarns intersect in the plane defined by the paper-facing side of said reinforcing structure, and machine side knuckles at those locations where said warp yarns and said weft yarns intersect in the plane defined by the machine-facing side of said reinforcing structure; said raised portions of said structural components being formed by those portions of said warp yarns and said weft yarns which lie in the machine-facing side of said reinforcing structure between said machine side knuckles.
4. The papermaking belt of Claim 3 wherein said reinforcing structure comprises a multilayer woven element, said machine-direction warp yarns are disposed in a first layer and in a second layer, said warp yarns in said first and second layers being arranged in a generally vertically stacked relationship with each other, said first layer together with said interwoven weft yarns forming said paper-facing side of said reinforcing structure, and said second layer together with said interwoven weft yarns forming said machine-facing side of said reinforcing structure.
5. The papermaking belt of Claim 4 wherein certain of said raised portions of the reinforcing structure form a raised surface, wherein said portions of said passageways which are positioned in said interstices of said reinforcing structure are positioned predominately between the plane defined by the machine-facing side of said reinforcing structure and the plane defined by said raised portions which form said raised surface.
6. The papermaking belt of Claim 1, 2, 3, 4, or 5 wherein said framework comprises photosensitive resin.
7. The papermaking belt of Claim 6 wherein said paper side network is macroscopically monoplanar, patterned and continuous.
8. The papermaking belt of Claim 7 wherein said conduits have walls which extend between said first surface and said second surface, said walls defining both the interior portion of said conduits and the interior walls of said framework, said interior walls being tapered outwardly from said first surface of said framework to said second surface of said framework so that the surface area of the paper side network is less than about 70 percent of the total surface area of said framework, and the surface area of the backside network is at least about 45 percent of the total surface area of said framework.
9. A method of making a papermaking belt having a textured backside, said papermaking belt comprising a reinforcing structure and a resinous framework having a first surface, a second surface opposite said first surface, and conduits extending between said first surface and said second surface, said first surface having a paper side network formed therein defining said conduits, said second surface having a backside network with passageways, distinct from said conduits, that provide surface texture irregularities in said backside network, the method comprising the steps of:

(a) providing a forming unit with a deformable, constant volume, working surface;
(b) providing a reinforcing structure having a paper-facing side, a machine-facing side opposite said paper-facing side, interstices, and a reinforcing component comprised of a plurality of structural components, portions of some of said structural components being disposed inward of the plane defined by the machine-facing side of said reinforcing structure to form raised portions;
(c) bringing at least a portion of said machine-facing side of said reinforcing structure into contact with said working surface of said forming unit;
(d) pressing said machine-facing side of said reinforcing structure into said deformable, constant volume, working surface to cause portions of said working surface of said forming unit to deform and form protrusions between the plane defined by the machine-facing side of the reinforcing structure and some of said raised portions of said structural components and in some of said interstices;
(e) applying a coating of liquid photosensitive resin to at least one side of said reinforcing structure so that said coating substantially fills the void areas of said reinforcing structure and forms a first surface and a second surface, said coating being distributed so that at least a portion of said second surface of said coating is positioned adjacent said working surface of said forming unit, said paper-facing side of said reinforcing structure is positioned between said first and second surfaces of said coating, and the portion of said coating which is positioned between said first surface of said coating and said paper-facing side of said reinforcing structure forms a resinous overburden, wherein said protrusions in said working surface exclude portions of said coating along said second surface of said coating from some of the spaces which lie between the plane defined by the machine-facing side of said reinforcing structure and said raised portions and also from portions of at least some of said interstices to form excluded areas in said second surface of said coating which are defined by said protrusions;
(f) controlling the thickness of said overburden to a preselected value;
(g) providing a mask having opaque and transparent regions, said opaque regions together with said transparent regions defining a preselected pattern in said mask;
(h) positioning said mask between said coating of liquid photosensitive resin and an actinic light source so that said mask is in contacting relation with said first surface of said coating, said opaque regions of said mask shielding a portion of said coating from the light rays of said light source and said transparent regions leaving other portions of said coating unshielded;
(i) curing said unshielded portions of said coating of liquid photosensitive resin and leaving said shielded portions uncured by exposing said coating of liquid photosensitive resin to said light source through said mask to form a partially-formed composite belt; and (j) removing substantially all uncured liquid photosensitive resin from said partially-formed composite belt to leave a hardened resin framework around at least a portion of said reinforcing structure, which framework has a plurality of conduits in those regions which were shielded from said light rays by the opaque regions of the mask and passageways which provide surface texture irregularities in the backside network of said framework in those portions of said backside network which correspond to the places where the second surface of the coating was defined by the protrusions in the working surface of the forming unit.
10. The method of Claim 9 additionally comprising the step of applying a coating of liquid photosensitive resin to at least said machine-facing side of said reinforcing structure prior to pressing said machine-facing side into said deformable, constant volume, working surface.
11. The method of Claim 9 wherein step (a) of providing a forming unit with a deformable, constant volume, working surface comprises (i) providing a forming unit comprising a drum having a circular cross-section, and (ii) providing said drum with a deformable, constant volume, working surface, and wherein step (d) of pressing said machine-facing side of said reinforcing structure into said deformable, constant volume, working surface comprises tensioning said reinforcing structure so that forces are exerted by said reinforcing structure in directions normal to the working surface of said forming unit which press said machine-facing side of said reinforcing structure into said working surface.
12. The method of Claim 11 wherein step (a)(ii) of providing said drum with a deformable, constant volume, element having a working surface and a forming unit-contacting surface comprises (1) providing a deformable, constant volume, element having a working surface and a forming unit-contacting surface, and (2) placing said forming unit-contacting surface of said element on said forming unit.
13. The method of Claim 12 wherein said deformable, constant volume, element comprises a barrier film which protects said forming unit from becoming contaminated with resin.
14. The method of Claim 9 additionally comprising the step of interposing a conformable barrier film between said reinforcing structure and said working surface so that said barrier film protects said working surface from becoming contaminated with resin.
15. The method of Claim 12 additionally comprising the step of placing a conformable barrier film over said working surface of said element so that said barrier film protects said element from becoming contaminated with resin.
16. A method of making a papermaking belt having a textured backside, said papermaking belt comprising a reinforcing structure and a resinous framework having a first surface, a second surface opposite said first surface, and conduits extending between said first surface and said second surface, said first surface having a paper side network formed therein defining said conduits, said second surface having a backside network with passageways, distinct from said conduits, that provide surface texture irregularities in said backside network, the method comprising the steps of:
(a) providing a forming unit which comprises a drum having a circular cross-section, said forming unit being provided with a deformable, constant volume, working surface;
(b) providing a reinforcing structure having a paper-facing side, a machine-facing side opposite said paper-facing side, interstices, and a reinforcing component comprised of a plurality of structural components, portions of some of said structural components being disposed inward of the plane defined by the machine-facing side of said reinforcing structure to form raised portions;

(c) applying a first coating of liquid photosensitive resin to at least said machine-facing side of said reinforcing structure to at least partially fill the void areas of said reinforcing structure;
(d) bringing at least a portion of said machine-facing side of said reinforcing structure into contact with said working surface of said forming unit;
(e) applying a second coating of liquid photosensitive resin to said paper-facing side of said reinforcing structure so that said first coating together with said second coating forms a single coating which has a first surface and a second surface and said coating substantially fills the void areas of the reinforcing structure, said coating being distributed so that at least a portion of said second surface of said coating is positioned adjacent said working surface of said forming unit, and said paper-facing side of said reinforcing structure is positioned between said first and second surfaces of said coating, wherein the portion of said coating positioned between said first surface of said coating and the paper-facing side of said reinforcing structure forms a resinous overburden;
(f) controlling the thickness of said overburden to a preselected value;
(g) pressing said machine-facing side of said reinforcing structure into said deformable, constant volume, working surface by tensioning said reinforcing structure so that forces are exerted by said reinforcing structure in directions normal to the working surface of said forming unit which press said machine-facing side of said reinforcing structure into said working surface causing portions of the working surface of the forming unit to deform and form protrusions both between the plane defined by the machine-facing side of the reinforcing structure and some of said raised portions of said structural components and in some of said interstices, so that said protrusions force portions of said coating along said second surface toward said raised portions thereby excluding portions of said coating from some of the spaces which lie between the plane defined by the machine-facing side of said reinforcing structure and said raised portions and also from at least some portions of said interstices to form excluded areas in said second surface of said coating which are defined by said protrusions;
(h) providing a mask having opaque and transparent regions, said opaque regions together with said transparent regions defining a preselected pattern in said mask;
(i) positioning said mask between said coating of liquid photosensitive resin and an actinic light source so that said mask is in contacting relation with said first surface of said coating, said opaque regions of said mask shielding a portion of said coating from the light rays of said light source, and said transparent regions leaving other portions of said coating unshielded;
(j) curing said unshielded portions of liquid photosensitive resin and leaving said shielded portions uncured by exposing said coating of liquid photosensitive resin to light having an activating wavelength through said mask to form a partially-formed composite belt; and, (k) removing substantially all uncured liquid photosensitive resin from said partially-formed composite belt to leave a hardened resin framework around at least a portion of said reinforcing structure, which framework has a plurality of conduits in those regions which were shielded from 1ight rays by the opaque regions of the mask and passageways which provide surface texture irregularities in the backside network of said framework in those portions of said second surface of said resinous coating which were defined by the protrusions in said working surface.
17. The method of Claim 16 wherein the part of step (a) which comprises providing said forming unit with a deformable, constant volume, working surface comprises (i) providing a deformable, constant volume, element having a working surface and a forming unit-contacting surface, and (ii) placing said forming unit-contacting surface of said element on said forming unit.
18. The method of Claim 17 wherein said deformable, constant volume, element comprises a barrier film which protects said forming unit from becoming contaminated with resin.
19. The method of Claim 16 additionally comprising the step of interposing a conformable barrier film between said reinforcing structure and said working surface so that said barrier film protects said working surface from becoming contaminated with resin.
20. The method of Claim 17 additionally comprising the step of placing a conformable barrier film over said working surface of said element so that said barrier film protects said element from becoming contaminated with resin.
21. A process for making a strong, soft, absorbent paper web comprising the steps of:
(a) providing an aqueous dispersion of papermaking fibers (b) forming an embryonic web of papermaking fibers from said dispersion on a foraminous surface;
(c) contacting said embryonic web with the paper-contacting side of a papermaking belt made according to Claim 1, 2, 4, 5 or 7;
(d) traveling said papermaking belt and embryonic web over a vacuum source and applying a fluid pressure differential to said embryonic web with a vacuum source such that the fluid pressure differential is applied from the backside of said papermaking belt through the conduits of said papermaking belt to deflect at least a portion of the papermaking fibers in said embryonic web into the conduits of said papermaking belt, and to remove water from said embryonic web through said conduits, and rearrange said papermaking fibers in said embryonic web to form an intermediate web from said papermaking fibers under such conditions that said deflecting is initiated no later than the initiation of the water removal from the embryonic web;
(e) impressing said paper side network into said intermediate web by interposing said intermediate web between said papermaking belt and an impression surface to form an imprinted web of papermaking fibers; and, (f) drying said imprinted web.
22. The method of Claim 21 comprising the additional step of predrying said intermediate web in association with said papermaking belt to a consistency of from about 30% to about 98% to form a predried web of papermaking fibers prior to the step (f) of impressing said paper side network into said web.
CA002084999A 1990-06-29 1991-06-14 Papermaking belt and method of making the same using a deformable casting surface Expired - Lifetime CA2084999C (en)

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