WO1992000415A1 - Papermaking belt and method of making the same using differential light transmission techniques - Google Patents
Papermaking belt and method of making the same using differential light transmission techniques Download PDFInfo
- Publication number
- WO1992000415A1 WO1992000415A1 PCT/US1991/004256 US9104256W WO9200415A1 WO 1992000415 A1 WO1992000415 A1 WO 1992000415A1 US 9104256 W US9104256 W US 9104256W WO 9200415 A1 WO9200415 A1 WO 9200415A1
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- WO
- WIPO (PCT)
- Prior art keywords
- reinforcing structure
- belt
- papermaking
- paper
- framework
- Prior art date
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Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F3/00—Press section of machines for making continuous webs of paper
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/10—Heating 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/14—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of indefinite length
- B29C39/148—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of indefinite length characterised by the shape of the surface
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
- B29C39/14—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of indefinite length
- B29C39/18—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor for making articles of indefinite length incorporating preformed parts or layers, e.g. casting around inserts or for coating articles
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/222—Compression 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C43/00—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor
- B29C43/22—Compression moulding, i.e. applying external pressure to flow the moulding material; Apparatus therefor of articles of indefinite length
- B29C43/28—Compression 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D29/00—Producing belts or bands
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F1/00—Wet end of machines for making continuous webs of paper
- D21F1/0027—Screen-cloths
- D21F1/0036—Multi-layer screen-cloths
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F11/00—Processes for making continuous lengths of paper, or of cardboard, or of wet web for fibre board production, on paper-making machines
- D21F11/006—Making patterned paper
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
- D21H27/02—Patterned paper
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C3/00—Packages of films for inserting into cameras, e.g. roll-films, film-packs; Wrapping materials for light-sensitive plates, films or papers, e.g. materials characterised by the use of special dyes, printing inks, adhesives
-
- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03C—PHOTOSENSITIVE MATERIALS FOR PHOTOGRAPHIC PURPOSES; PHOTOGRAPHIC PROCESSES, e.g. CINE, X-RAY, COLOUR, STEREO-PHOTOGRAPHIC PROCESSES; AUXILIARY PROCESSES IN PHOTOGRAPHY
- G03C5/00—Photographic processes or agents therefor; Regeneration of such processing agents
- G03C5/56—Processes using photosensitive compositions covered by the groups G03C1/64 - G03C1/72 or agents therefor
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C35/00—Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
- B29C35/02—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
- B29C35/08—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
- B29C35/0805—Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
- B29C2035/0827—Heating 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING 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
- B29K2105/00—Condition, form or state of moulded material or of the material to be shaped
- B29K2105/0002—Condition, form or state of moulded material or of the material to be shaped monomers or prepolymers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
- B29L2031/00—Other particular articles
- B29L2031/733—Fourdrinier belts
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S162/00—Paper making and fiber liberation
- Y10S162/90—Papermaking press felts
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S162/00—Paper making and fiber liberation
- Y10S162/901—Impermeable belts for extended nip press
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S162/00—Paper making and fiber liberation
- Y10S162/902—Woven fabric for papermaking drier section
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10S162/00—Paper making and fiber liberation
- Y10S162/903—Paper forming member, e.g. fourdrinier, sheet forming member
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
- Y10T428/24355—Continuous and nonuniform or irregular surface on layer or component [e.g., roofing, etc.]
- Y10T428/24446—Wrinkled, creased, crinkled or creped
-
- Y—GENERAL 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
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T442/00—Fabric [woven, knitted, or nonwoven textile or cloth, etc.]
- Y10T442/30—Woven fabric [i.e., woven strand or strip material]
- Y10T442/3179—Woven fabric is characterized by a particular or differential weave other than fabric in which the strand denier or warp/weft pick count is specified
- Y10T442/3195—Three-dimensional weave [e.g., x-y-z planes, multi-planar warps and/or wefts, etc.]
- Y10T442/3203—Multi-planar warp layers
Definitions
- the present invention 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 is concerned with papermaking belts comprised of a resinous framework and a reinforcing structure which have a texture on their machine-contacting side, or backside. The texture is imparted to the belt by applying a coating of photosensitive resinous material .to a reinforcing structure which has opaque portions, and then exposing the resinous material to light having an activating wavelength through the reinforcing structure so that the resinous material under the opaque portions of the reinforcing structure remains w ured. The uncured resin is then removed to leave passageways ii- .ne backside of the belt.
- 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.
- Paper products such as paper towels, facial tissues, 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 find wide acceptance, they, and the tissue paper webs from which they are made, must exhibit certain physical characteristics.
- 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 purposes.
- Absorbency is the characteristic of the paper which allows it to take up and retain fluids, particularly water and aqueous solutions and suspensions. In evaluating the absorbency 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 addition, 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 manufacturing of paper products for use in tissue, toweling and sanitary products generally involve the preparation of an aqueous slurry of paper fibers and then subsequently removing the water from the slurry while contemporaneously rearranging the fibers in the slurry to form a paper web.
- Various types of machinery can be employed to assist in the dewatering process.
- both types of machines After the initial forming of the paper web on the Fourdrinier wire or wires, both types of machines generally carry the paper
- the drying process(es) can involve mechanical compaction of the paper web, vacuum dewatering, drying by blowing heated air through the paper web, and other types of processes.
- papermaking belts or fabrics carry various
- 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
- Woven papermaking fabrics generally comprise a plurality of spaced
- Prior belts have included single layer (of warp and weft threads) fabrics, multilayered fabrics, and fabrics with several layers each of which comprises interwoven warp and weft threads.
- the threads of papermaking fabrics were made from wires comprised of materials such as phosphor bronze, bronze, stainless steel, brass or combinations thereof. Often various materials were placed on top of and affixed to the fabrics to attempt to make the dewatering process more efficient.
- synthetic materials may be used in whole or part to produce the underlying wire structures, which are superior in quality to the forming wires made of metal threads.
- Such synthetic materials have included Nylon, polyesters, acrylic fibers and copolymers. While many different processes, fabrics, and arrangements of these fabrics have been used, only certain of these processes, fabrics, and arrangements of these fabrics have resulted in commercially successful paper products.
- the resin framework was provided with a plurality of discrete, isolated, channels known as "deflection conduits.”
- the process in which this deflection member was used involved, among other steps, associating an embryonic web of papermaking fibers with the top surface of the deflection member and applying a vacuum or other fluid pressure differential to the web from the backside (machine-contacting side) of the deflection member.
- the papermaking belt used in this process was termed a "deflection member" because 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.
- the deflection 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 . , which is the incorporated by reference herein.
- the process described in the Johnson, et al . patent includes the steps of: 1) coating the fora inous woven element with a photosensitive resin; 2) controlling the thickness of the photosensitive resin to a preselected value; 3) exposing the resin to a light having an activating wave length through a mask having opaque and transparent regions; and 4) removing the uncured resin.
- This process produced a deflection member with a framework which had a paper web-con ncting surface and a machine-contacting surface that were each provided with a network pattern surrounding the conduits which was essentially onoplanar or smooth.
- the strength of the paper produced was increased as a result of the relatively high 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 was increased due to the fact that the overall density of the paper was reduced.
- 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 is, the machine "downtime") during the time a replacement belt is being fitted on the 5 papermaking machine.
- 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 caused by utilizing a papermaking belt made by the prior processes.
- the backside textured papermaking belt of the present invention is generally comprised of two primary elements: a framework and a reinforcing structure.
- a framework When the papermaking belt of the present invention is in its preferred form, it is an endless belt which has a paper-contacting side and a textured backside, opposite the paper-contacting side, which contacts the machinery employed in the papermaking process.
- the framework is preferably a cured 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 surface 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. A first portion of the reinforcing component has a first opacity, and a second portion of the reinforcing component has a second opacity which is less than the first opacity.
- the first opacity is sufficient to substantially prevent curing of the photosensitive resinous material which comprises the framework when the photosensitive resinous material is in its uncured state and the first portion of the reinforcing component is positioned between the photosensitive resinous material and an actinic light source.
- the second opacity is sufficient to permit curing of the photosensitive resinous material.
- the first portion defines a first projected area.
- the position of the passageways in the backside network of the framework relative to the reinforcing structure is such that the passageways are positioned predominately within the first projected area.
- coating being distributed so that at least a portion of the second surface of the coating is positioned adjacent the working surface of the forming unit, and portions of
- the process for making a strong, soft, absorbent paper web of the present invention comprises the steps of:
- FIG. 1 is a schematic representation of one embodiment of a continuous papermaking machine useful in carrying out the process of this invention.
- FIG. 1A is a simplified schematic representation of a cross-section which shows the partially-formed embryonic web of papermaking fibers prior to its deflection into a conduit of the papermaking belt of the present invention.
- FIG. IB is a simplified representation in cross-section of the portion of the embryonic web shown in FIG. 1A after the fibers of the embryonic web have been deflected into one of the conduits of the papermaking belt.
- FIG. 2 is a plan view of a portion of the preferred embodiment of the improved papermaking belt of the present invention.
- FIG. 3 is an enlarged cross-sectional view of the portion of the papermaking belt shown in FIG. 2 as taken along line 3 - 3.
- FIG. 4 is an enlarged cross-sectional view of the portion of the papermaking belt shown in FIG. 2 as taken along line 4 - 4. 15
- FIG. 5 is a plan view of a portion of an alternative embodiment of the papermaking belt of the present invention which has a monolayer reinforcing structure.
- FIG. 5A is a cross-sectional view of the portion of the 5 papermaking belt shown in FIG. 5 as taken along line 5A - 5A.
- FIG. 5B 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 multilayer reinforcing structure which can be used in the 10 papermaking belt of the present invention.
- FIG. 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.
- FIG. 9 is an extended sectional view of the reinforcing structure of FIG. 6 taken along line 9 - 9 of FIG. 6.
- FIG. 10 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 20 structure of FIG. 6 taken along line 11 - 11 of FIG. 6.
- FIG. 11A is a sectional view, similar to FIG. 8 but also showing a portion of the surrou ding framework, which illustrates
- FIG. 11B is a sectional view, similar to FIG. 11A, which illustrates another variation of one type of woven reinforcing structure in which every alternate bottom warp yarn is opaque.
- FIG. 11C is a plan view, similar to FIG. 6, which illustrates another variation of one type of reinforcing structure which can be used in the present invention, in which a pattern is printed on the surface of reinforcing structure with an opaque substance.
- 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.
- 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 p- an view of the reinforcing structure, similar to FIG. 6, which illustrates the projected reinforcing area of a portion of the reinforcing structure.
- FIG. 14 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. 15 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, similar to FIGS. 13 and 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 5 to the preceding plan views of the same, which illustrates some of e the projected knuckle areas of the reinforcing structure.
- FIG. 18B is an extended sectional view of the reinforcing structure, similar to FIG. 7, which illustrates some of the projected knuckle areas of the reinforcing structure from another 10 angle.
- 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 15 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 20 shown in FIGS. 2 through 4.
- FIG. 20 is an enlarged schematic representation of another preferred conduit opening geometry.
- FIG. 21 is a greatly enlarged and exaggerated schematic sectional view of a portion of the framework and reinforcing
- FIGS. 22A, B, and C are simplified schematic 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.
- FIG. 23A is an enlarged schematic representation of the problems which occurred when a papermaking belt without the improvements disclosed herein encountered the vacuum dewatering equipment during the papermaking process.
- 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 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. 25.
- FIG. 27 is an enlarged schematic representation of a process for making the papermaking belt of the present invention by casting photosensitive resin on a woven multilayer reinforcing structure which has opaque yarns.
- FIG. 28 is an enlarged schematic sectional view taken along line 28-28 of FIG. 27 showing a portion of the casting surface and those portions of the photosensitive resin which remain uncured to provide surface texture irregularities in the backside of the papermaking belt of the present invention.
- FIG. 29 is an enlarged schematic sectional view of a portion of the casting surface shown in FIG. 27, generally similar to FIG.
- FIG. 28 which shows an alternative embodiment of the reinforcing structure shown in FIG. 28.
- FIG. 30 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. 31 is a schematic side view of the testing apparatus shown in FIG. 31.
- FIG. 32 is a graphical representation of the calibration of the flow meter used in the apparatus shown in preceding two figures.
- FIG. 33A is a plan view photograph, enlarged about 25 times actual size, of the top side of a papermaking belt which does not contain the improvements disclosed herein.
- FIG. 33B is a plan view photograph, enlarged about 25 times actual size, of the backside of a papermaking belt which does not contain the improvements disclosed herein.
- FIG. 34A is a photograph, enlarged about 25 times, of the top side of a papermaking belt made in accordance with the method of the present invention. 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. 34B is a photograph, enlarged about 25 times, of the backside of the papermaking belt shown in FIG. 34A. The photograph was taken at an angle of approximately 35 degrees relative to an imaginary line drawn normal to the surface of the backside.
- FIG. 34C is a cross-machine direction view photograph, enlarged about 25 times, of the papermaking belt shown in FIGS. 34A and 34B.
- the specification contains the following, in order: a detailed description of the papermaking belt of the present invention; the method of making this papermaking belt; and a detailed description of the process for making paper according to the present invention.
- the papermaking belt of the present invention takes the form of an endless belt, papermaking belt 10.
- the papermaking belt 10 carries a paper web (or "fiber web") in various stages of its formation and travels in the direction indicated by directional arrow B around the papermaking belt return rolls 19a and 19b, impression nip roll 20, papermaking belt return rolls 19c, 19d, 19e and 19f, and emulsion distributing roll 21.
- the loop the papermaking belt 10 travels around includes a means for applying a fluid pressure differential to the paper web, such as vacuum pickup shoe 24a and ultislot vacuum box 24.
- the papermaking belt also travels around a predryer such as blow-through dryer 26, and passes between a nip formed by the impression nip roll 20 and a Yankee dryer drum 28.
- 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, stationary 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 papermaking belt 10 of the present invention is generally comprised of two primary elements: a framework 32 (preferably, a hardened polymeric photosensitive resin framework) and a reinforcing structure 33.
- a framework 32 preferably, a hardened polymeric photosensitive resin framework
- a reinforcing structure 33 preferably, a hardened polymeric photosensitive resin framework
- 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 12 of the belt 10 contacts the machinery employed in the papermaking operation, such as vacuum pickup shoe 24a and multislot vacuum box
- the framework 32 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 32 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. 2 shows that the network 32a comprises the solid portion of the framework 32 which surrounds the conduits 36 defines a net-like pattern. As shown in FIG.
- FIG. 2 shows that the first surface 34 of the framework 32 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.
- 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.
- FIGS. 3 and 4 show that the reinforcing structure 33 of the papermaking belt 10 of the present invention, in general, is at least partially surrounded by and enveloped (or embedded, or encased) in the framework 32.
- 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. 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.
- the reinforcing structure 33 has interstices 39 and a reinforcing component 40.
- the reinforcing component 40 comprises the portions of the reinforcing structure exclusive of the interstices 39 (that is, the solid 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 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 passageways 37 allow air to enter between the backside surface 12 of the papermaking belt
- the surface texture irregularities 38 provide an uneven surface for contacting the machinery employed in the papermaking operation.
- 1-4 is the surface of the papermaking belt 10 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 23
- 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 as the paper-contacting side 11 is also consistently
- the paper-contacting side 11 of the belt 10 may also be referred to as the "top surface” or the "embryonic
- 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 paper-contacting side 11 of the belt 10 is generally formed entirely by the first surface 34 of the framework 32.
- the opposed surface of the belt 10, the backside 12, is the surface which travels over and is generally in
- FIG. 1 shows that the side of the belt 10 referred to
- the backside 12 can be distinguished from the paper-contacting side 11 because the backside 12 never contacts a
- papermaking belt 10 of the present invention 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 is the surface of the belt which is subjected to the abrasive action of
- the backside 12 of the belt 10 may be referred to as the bottom surface, the orientation of the backside 12 may be such that it is facing upward on the return path in a papermaking machine when the belt 10 is in the configuration of an endless belt.
- 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 framework 32, although such an embodiment may not occur often in the papermaking belt 10 of the present invention.
- 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 backside network 35a of the framework 32 and partially by the machine-facing side 52 of the reinforcing structure 33. It is 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 the papermaking belt 10 of the present invention, is shown in FIGS. 2-4.
- the reinforcing 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 partially-formed webs of paper, and to permit water removed from the paper web to pass through the papermaking belt 10.
- the reinforcing structure 33 can take any number of different forms.
- the reinforcing structure 33 can comprise a woven element (also sometimes referred to herein as a woven “fabric"), 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 suitable material) with a plurality of holes punched or drilled in it provided the reinforcing structure 33 adequately reinforces the framework 32 and has sufficient projected open area for the purposes specified above.
- the reinforcing structure 33 comprises a woven element (or more particularly, a foraminous woven element) such as that shown in FIGS. 2-4.
- the reinforcing structure 33 comprises a reinforcing component 40 and a plurality of interstices (or "fine foramina") 39.
- the reinforcing component 40 is the portion of the reinforcing structure 33 exclusive of the
- the reinforcing component 40 is the solid portion of the reinforcing structure 33.
- reinforcing component 40 is comprised of one or more structural components 40a.
- structural components refers to the individual structural elements that comprise the
- 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
- FIG. 2 shows that typically, each interstice 39 is only a fraction of the size of a conduit opening 42, but the alternate
- 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”) 25 generally designated 52, opposite 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
- T reinforcing structure 33 are consistently referred to by these names even prior to the incorporation of the reinforcing structure
- 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 will always be opposite the machine-facing side 52.
- 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 individual yarns which are woven together to form the woven element comprise the structural components 40a of the reinforcing structure 33. If the reinforcing structure 33 comprised a nonwoven element, the individual fibers forming the nonwoven element would comprise the 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 is a plate with a plurality of holes punched in it, there will be only one structural component 40a (the plate), and this will comprise the reinforcing 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, filaments, and threads are synonymous 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.) could comprise not only onofilament elements, but also multifilament elements.
- the reinforcing structure 33 comprises a woven element, as shown in FIGS. 2 - 4, some of the individual structural components 40a comprise machine-direction warp yarns, generally designated 53, and some comprise cross-machine direction weft yarns, generally designated 54.
- machine-direction warp “warp”, and “load-bearing warp” are synonymous and refer to yarns which are generally oriented in the machine direction when the papermaking belt 10 of the present
- warp 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 invention is installed in a
- machine direction refers to that direction which is parallel to the flow of the paper web through the equipment.
- cross-machine direction (CD) is perpendicular to the machine direction.
- 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 20 is being woven in a loom.
- whether a yarn is referred to as a warp or a weft depends in part upon whether the fabric is an endless woven fabric that does not have to be seamed into a loop to form an endless belt, or whether it is a flat woven fabric which must be seamed into a loop to form an endless belt. 25
- warp threads in the loom will extend crosswise in a papermaking machine.
- the threads which are referred to as warp threads in the loom will extend in
- % 30 the machine direction in a papermaking machine.
- warp yarns and “weft yarns” refer to the orientation
- warp yarns means machine-direction ?arp yarns
- weft yarns means cross-machine direction weft yarns when the papermaking belt of the present invention is installed on a papermaking machine.
- FIGS. 2-4 also show that in a woven reinforcing structure 33, some of the yarns will cross to form knuckles 105 in the fabric.
- 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 over a weft yarn which lies in the plane of one of the surfaces (that is, either the paper-facing side 51, or the machine-facing 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 105j.
- Knuckles which lie in the machine-facing side 52 are designated 1052-
- These knuckles 105 may be further classified herein and referred to as either “warp knuckles”, or “weft knuckles”.
- 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).
- 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 105a ⁇
- warp knuckles which lie in the machine-facing side 52 are designated 105a2-
- weft knuckles The knuckles formed by a portion of a weft yarn that passes over a warp yarn are referred to herein as "weft knuckles".
- Several such weft knuckles are shown as 105b in FIGS. 2 and 3.
- FIG. 3 shows that the weft knuckles, like the warp knuckles, can either lie in the paper-facing side 51 of the reinforcing structure 33, such as weft knuckle 105b ⁇ , or they can lie in the machine-facing side 52 of the reinforcing structure 33, such as weft knuckle 105b2- 29
- Suitable woven elements include foraminous monolayer woven elements (having a single set of strands running in each 5 direction and a plurality of openings therebetween) such as the reinforcing structure 33 shown in FIGS. 5, 5A, and 5B, multilayer
- composite papermaking belt refers to a belt which is comprised of a framework and a reinforcing structure.
- a multilayer woven element preferably has some type of structure which provides for reinforcement of its machine direction yarns 53 in order to reduce the aforementioned stretching problem.
- the multilayer fabric must have increased fabric stability in the
- the arrangement of the warp yarns 53 should be such that any additional reinforcement of the warp yarns does not y reduce the projected open area of the reinforcing structure 33.
- 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 reinforcing structure is shown as A 0 in FIG. 12 of the accompanying drawings.
- 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.
- 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.
- the x, y, and z directions are orientations relating to the papermaking belt of the present invention (or portions thereof) in a Cartesian coordinate system.
- 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
- the z axis is perpendicular to the plane defined by the x and y axes.
- 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).
- 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 ft.2 of its surface at a pressure differential of 100 pascals.
- the composite belt should have an air permeability in the range of about 300 cfm to about 600 cfm.
- the preferred air permeability for the composite belt is about 500 cfm.
- the projected open area A 0 of the reinforcing structure 33 not be reduced below about 30%, and most preferably that the projected open area not be reduced below about 40% to about 50%.
- a preferred reinforcing structure 33 is a multilayer woven 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.
- the first direction is the cross-machine direction.
- the single layer of yarns which extend in the first direction comprise the weft yarns 54.
- 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.
- 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.
- the preferred multilayer reinforcing structure 33 has warp yarns 53 which are vertically stacked directly on top of one another.
- the weft yarns 54 are preferably arranged in such a manner that they maintain and stabilize the warp yarns 53 in a vertically-stacked arrangement.
- the weft yarns 54 may also be vertically stacked, or they may be in some other relationship. Numerous variations 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. 2-4.
- 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.
- 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.
- the multilayer fabric described herein is preferably used in conjunction with a framework of some type.
- 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.
- 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 vertically-stacked superposed position one over the other. These 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 pair E; warp yarns 53b and 53f define stacked warp yarn pair F; warp yarns 53c and 53g define stacked warp yarn pair G; and, warp yarns 53d and 53h define stacked warp pair H.
- the adjacent stacked warp yarn pairs are spaced apart in the cross-machine direction to provide the desired fabric open area.
- 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.
- 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 wars 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 individual 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.
- 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 after every group of four threads).
- the specific pattern of weaving the warp yarns 53 is shown best 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.
- 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. 7) 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 - 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 woven 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.
- 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.
- the neighboring weft yarns are woven around the warp yarns 53 in the same manner.
- the adjacent weft yarns such as weft yarn 54b, is displaced a pair of warps from that of the first weft yarn.
- 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 third stacked pair, and under the fourth stacked pair of warp yarns.
- 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 fourth weft yarn. As shown in 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.
- the first two cross-over points 55 are in a straight diagonal line.
- the third cross-over point 55 is shifted over a third warp yarn to a fourth warp yarn and the fourth cross-over point 55 shifted over a third warp yarn to a fourth warp yarn and then the cross-over point 55 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.
- 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.
- 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 yarns 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 different layers and yarn systems are constructed of essentially the same material.
- any convenient cross-sectional dimensions (or size) of the yarns can be used as long as the flow of air and water through the conduits 36 is not significantly hampered during the 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 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.
- yarns of the warp system C and the weft system 54 are identical, and the yarns of the warp system D are different.
- 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.
- the yarns in each of the warp system C, warp system D, and the weft system can be different.
- a preferred range of yarn diameters 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. 37
- 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 cross-sections include round, oval, square, and rectangular shapes.
- the cross-sectional shapes of the yarns in the different layers and yarn systems can also vary between the layers and yarn systems.
- both the warp yarns 53 and the weft yarns 54 have round cross-sections.
- a first portion Poi of the reinforcing component 40 which comprises the reinforcing structure 33 has a first opacity Oj
- a second portion P02 of the reinforcing component 40 has a second opacity 02-
- the two opacities 0 ⁇ and O2 are related such that the second opacity O is less (that is, relatively less opaque) than the first opacity Oi.
- the first opacity Oi should be sufficient to substantially prevent the curing of the photosensitive resinous material which comprises the framework 32 when that photosensitive resinous material is in its uncured state and the first portion Poi is positioned between the photosensitive resinous material and an actinic light source. It should be understood that only a portion of this photosensitive resinous material is positioned on the opposite side of the first portion Poi with respect to the light source. The rest of the resinous material will be in other locations.
- the purpose of the first portion (or "the opaque portion") Poi is to prevent the portion of the resinous material which is positioned on the other side of the first portion Poi from curing during the method of making the papermaking belt 10 of the present invention.
- the characteristics and the dimensions of the first portion P ⁇ i should be such that the passageways 37 and surface texture irregularities 38 created by the removal of the uncured resin provide the desired amount of backside texture to the finished belt (as hereinafter described).
- the first portion Poi should generally be located near or on the machine-facing side 52 of the reinforcing structure 33. Such a location will ensure that the resin which is prevented from curing lies generally along the second surface 35 of the framework 32 of the belt, rather than in the interior portion of the framework 32.
- interior portion is that portion of the framework 32 which lies between the first and second surfaces 34 and 35. If the first portion Poi is not so located, an excessive amount of resin between the first and second surfaces 34 and 35 of the framework 32 will remain uncured. This will greatly weaken the framework 32 and will also weaken the bond between the framework 32 and the reinforcing structure 33.
- the first portion Poi can be any portion of the reinforcing component 40 provided that it prevents the resin from curing sufficiently to form the desired passageways 37 and surface texture irregularities 38 in the backside network 35a.
- the first portion Poi can comprise a portion or portions of one or more of the structural components 40a.
- the reinforcing structure 33 comprises a woven element
- the first portion Poi can, for example, be a portion or portions of a single yarn, a portion or portions of several yarns, an entire yarn, several entire yarns, or any combination of the same.
- the first portion Poi comprises an entire warp yarn or yarns. It is generally preferable that the warp yarns 53, rather than the weft yarns 54, comprise the first portion Poi.
- the reason for this preference is that in the preferred woven reinforcing structures, the weaving pattern of the warp yarns 53 will cause them to be generally disposed closer to what will become the second surface 39
- the reinforcing structure 33 comprises the preferred multilayer woven element having vertically-stacked warp yarns described above, and the first portion Poi comprises at least some of the
- first portion Poi is described as comprising at least some of the warp yarns 53 in the second warp layer D, the first portion Poi can, for instance, comprise every alternating warp yarn (as shown in FIG. 11B), or
- the first portion Poi comprises an opaque coating Co which has been applied to at least a portion of one of the sides of the reinforcing structure 33.
- the opaque coating is
- the opaque coating Co can be applied in any particular manner or pattern to the machine-facing side 52 of the reinforcing structure 33 as long as the desired passageways 37 and surface texture irregularities 38 are formed in the backside network 35a.
- the opaque coating Co can be applied randomly, uniformly, regularly, or in some particular pattern.
- the opaque coating Co can be applied to the reinforcing structure 33 by any means known in the art for coating articles.
- the first portion Pol is generally provided with the first
- Suitable opaque materials include those which either absorb, scatter, or reflect actinic light. Examples of materials which absorb actinic light include organic dyes and carbon black. An example of a material which scatters actinic light is Ti 02- Materials which reflect actinic light can include metal (s) which are deposited on, or included in the fabric. The same materials are also suitable for use in the opaque coating described above.
- the opaque material used is opaque to light having a wavelength of between about 200 and 400 nanometers.
- 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
- 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 area); projected knuckle areas, including projected machine side knuckle areas; and, a first and a second projected area.
- the projected interstitial areas are shown in FIG. 12 as Api.
- the term "projected interstitial areas" refers to the individual projected areas defined by the projection of the interstices 39 of the reinforcing structure 33.
- each interstice 39 will provide direct lines of sight through the reinforcing structure which constitute the projected interstitial areas Ap-j.
- the projected structural component area A$c is shown in FIG.
- projected structural component area refers to the area defined by the projection of an individual structural component 40a of the reinforcing structure 33.
- projected structural component areas shall mean the area defined by the projection of more than one, but not all of the structural components 40a of the reinforcing structure 33.
- the term "projected reinforcing area” shall mean the area defined by the projection of the reinforcing component 40. As shown in FIGS. 12 and 13, the projected reinforcing area A " R 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.
- the term "projected warp area" A W p refers to the area defined by the projection of the individual warp yarns 53 of the reinforcing structure 33.
- the projected warp areas A W p are shown as the cross-hatched areas which lie between the dotted lines. These dotted lines could also extend above the paper-facing side 51 of the reinforcing structure 33.
- 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.
- the passageway or irregularity will generally lie between the paper-facing side 51 of the reinforcing structure 33 and a plane defined by the backside 12 of the belt 10.
- a passageway or a surface texture irregularity "lies within” the projected warp areas shown in FIGS. 14 and 15, it can be any place within the areas that are shaded in FIG. 14, or cross-hatched in FIG. 15.
- a W po which comprises the total for the entire fabric of the individual projected warp areas.
- the projected weft areas A w t are shown in FIGS. 16 and 17.
- the term "projected weft area” A w t refers to the area defined by the projection of the individual wefts 54 of the reinforcing structure 33.
- the projected weft area A w t there is an "overall projected weft area” A w to (a portion of which is shown in FIGS. 16 and 17) which comprises the total of the individual projected weft areas A w t or the entire reinforcing structure.
- the term "projected knuckle area" of the reinforcing structure 33 refers to the area defined by the projection of one of the knuckles 105 of a woven reinforcing structure. As shown in FIGS. 18A - 18C, a projected knuckle area AK is the portion of the reinforcing structure 33 where a warp yarn and a weft yarn overlap which blocks out lines of sight through the reinforcing structure 33.
- the projected knuckle areas can be further classified as projected warp knuckle areas A wp (the projected area formed by a warp yarn passing over a weft yarn) or projected weft knuckle areas A
- the projected warp knuckle areas A «wp and the projected weft knuckle areas A ⁇ w can be further classified as projected paper (or paper-facing) side warp knuckle areas A «wpl or weft knuckle areas A ⁇ wtl > and projected machine-facing (or machine side) warp knuckle areas A
- a portion of the first projected area Aj and a portion of the second projected area A are shown as cross-hatched areas in FIGS. 11A and 11B, respectively.
- first projected area Ai is the area defined by the projection of the first portion Poi of the reinforcing structure 33 which has the first opacity Oi-
- the remainder of the reinforcing structure 33 generally has the second opacity O2 and defines the second projected area A2.
- FIGS. 11A and 11B show that the passageways 37 in the backside network 35a of the framework 32 are positioned predominately within the first projected area A] (whether the first portion Poi be formed by every warp yarn 53 or every alternating warp yarn, or by some other portion of the reinforcing structure 33).
- the other primary element of the papermaking belt 10 of the present invention is the framework 32.
- the overall characteristics of the framework 32 are shown in FIGS. 2-4.
- 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.
- the material 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.
- the material must be manipulated so that the second surface 35 of the framework 32 has a backside network 35a with passageways 37, distinct from the conduits 36, that provide surface texture irregularities 38 in the backside network 35a.
- the mass of material which is manipulated to form the framework 32 can be any suitable material, including 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.
- 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 will depend on the material 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 light of an activating wavelength.
- 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 FIGS. 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 the framework 32. That is, the first surface 34 of the framework
- the second surface 35 of the framework 32 of the papermaking belt 10 of the present invention does not necessarily always form the backside 12 of the papermaking belt 10. Since the reinforcing structure 33 is positioned 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 portion of the reinforcing structure 33; or, cover no portions of the reinforcing structure 33 and lie entirely within the interstices 39 of the reinforcing structure 33. In the first case, the second surface
- the backside 12 of the papermaking belt 10 will be comprised partially of the second surface 35 of the framework 32 and partially of the exposed portion of the reinforcing structure 33.
- the backside 12 of the papermaking belt 10 will also be comprised partially 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.
- FIG. 2 shows that the first surface 34 of the framework 32 (and the paper-contacting side 11 of the papermaking belt 10) is comprised of a portion of a network which is designated 32a.
- the term "network” refers to the portions of the framework 32 which surround the conduits 36 and define a net-like pattern.
- the network 32a is the solid portion of the framework 32.
- the network 32a has two network surfaces 34a and 35a.
- the term "network surface” refers to one of the surfaces of the network 32a which surrounds the conduits 36.
- 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 also used in the patents issued 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 referenced is the “paper side network surface” or the “backside network surface”.
- the term “paper side network surface”, (or “paper side network” for short) refers to the solid portion of the framework on the top, or the first surface 34 of the framework 32.
- the surface of the framework which is referred to as the "network surface” in the patents which are incorporated by reference herein generally corresponds to the paper side network surface in the present specification.
- the paper side network surface is represented by reference numeral 34a in the drawings.
- backside network surface 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.
- the first surface 34 of the framework 32 comprises both the paper side network surface 34a, and first conduit openings 42.
- the first conduit openings 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.
- the backside network surface 35a and the second conduit openings 43 will likewise be described herein as complementary.
- 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.
- 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 “essentially” 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 performance 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 essentially 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 performance of the product made on the papermaking belt 10.
- conduits 36 which pass from the first surface 34 of the framework 32 to the second surface 35 of the framework 32 are shown in FIGS. 2-4.
- Each conduit 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 foramina”), such as first conduit opening 42 formed along the first surface 34 of the framework 32; a mouth, or conduit opening, such as second conduit opening 43 formed generally along the second surface 35 of the framework 32; and, 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 lies between the first and second surfaces 34 and 35).
- the walls 44 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.
- 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.
- portions 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 conduit openings 43 in the second surface 35 of the framework 32 are also of basically the same geometry as the first conduit openings 42.
- the 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.
- the shape and arrangement of the conduits 36 shown in FIG. 2 are in an especially preferred form.
- the shape of the conduit openings, 42 and 43, depicted in these figures is referred to herein as being in a "linear Idaho" pattern.
- the linear Idaho conduits are roughly in the shape of modified parallelograms in cross-section.
- the shape of the conduits 36 is described as resembling modified parallelograms because in this plan view, each conduit 36 has four sides in which each pair of opposite sides are parallel, the angle between adjacent sides are not right angles, and the corners formed between adjacent sides are rounded.
- the linear Idaho conduit openings may also be described as parallelograms having rounded corners.
- FIG. 19 The details of the construction of these linear Idaho conduits 36 are shown in FIG. 19. Only a portion of the framework 32 of the papermaking belt 10 showing the repeating pattern of conduits 36 is shown in FIG. 19. In addition, only the paper side network surface 34a on all but one of the conduits is shown for clarity of illustration. The particular shape of the conduits 36 is arrived at in the manner described below. As will be apparent, however, it is possible to vary the sequence of the steps and arrive at the same result. It is also apparent that the points, lines, 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.
- two points, Pi and P2 are selected which lie a certain distance, di, apart from one another.
- the line connecting the two points, Pi and P2 will be referred to as the machine direction axis, or longitudinal axis AL, of the conduit.
- the distance, di, between the two points, Pi and P (which is equal to the length of the longitudinal axis Aj , is preselected.
- a circle of a given radius, R ⁇ is drawn.
- a line A ⁇ is drawn perpendicular to the longitudinal axis AL of the conduit.
- This next line A ⁇ is drawn through the longitudinal axis AL, SO that it bisects the longitudinal axis AL- TWO points, P3 and P4, are then placed equidistant from the longitudinal axis AL on the second line A ⁇ .
- the distance, d2, between points P3 and P4 is also preselected.
- the line connecting points P3 and P4, A ⁇ will be referred to as the cross-machine direction axis or transverse axis of the conduit.
- R2 At both points P3 and P4, a circle of a given radius R2 is drawn. Although the latter radius, R , does not have to be equal to the radius i of the circle drawn earlier, in the preferred pattern shown in FIG. 19, R equals R2.
- tangent lines Li, 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 portions of the circles which are farthest away from the intersection of the longitudinal axis AL and the transverse axis A ⁇ .
- the line which passes around the perimeter of the shape thus described forms the walls 44 of the linear Idaho conduit 36.
- the sides of the first conduit openings are designated 45a, 45b, 45c, and 45d, and the rounded corners between adjacent sides are designated 46.
- the corresponding sides of the second conduit openings 43 are designated 45e, 45f, 45g, and 45h.
- the corresponding corners of the second conduit openings 43 are designated 46a.
- conduits 36 in the framework 32 of the papermaking belt 10 of the present invention include, but 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.
- 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 inch of the total surface area of the framework 32.
- 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.
- 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 referred to herein as the "knuckle areas" of the respective surfaces of the framework 32. These knuckle areas are shown as A ' NI and AN2 > respectively, in FIGS. 19A and 19B.
- the paper side knuckle area (or first surface knuckle area) ARI shaded in FIG.
- the proportionate amount of space occupied by the conduit openings can be derived from the amount of space occupied by the knuckle areas of the framework 32. Since the area occupied by the openings of the conduits and the area occupied by the respective network surfaces are complementary, the total of the two percentages is equal to 100%. 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 30% and about 80% of the total surface area of the framework 32. In other words, the first surface 34 of the framework 32 has about 20% - 70% knuckle 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 30% 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.
- FIG. 2 The particular arrangement of the individual conduits 36 and spacings between the conduits 36 shown in FIG. 2 is but one possible arrangement of the conduits 36. There are a number of preferred arrangements of the individual conduits 36 and spacings between the conduits 36. Several of these preferred arrangements and spacings are set forth in the discussion in Col. 8, lines 35 - 58 of U.S. Patent 4,528,239, entitled “Deflection Member", which issued to Paul D. Trokhan on July 9, 1985, which discussion is incorporated by reference herein.
- a particularly preferred arrangement of conduits 36 and spacings between conduits 36 is the bilaterally staggered array of openings shown in FIG. 2. In FIG. 2, it is shown that in this particularly preferred arrangement and spacing, the openings 42 of the conduits
- first conduit openings 42 are of sufficient size and spacing that, in any direction, the edges of the conduits 36 extend past one another.
- the parameters of the conduits 36 are designated herein as a "300 linear Idaho with 35% knuckle area" pattern.
- the first number of the above designation represents the number of conduits 36 present in the framework 32 per square inch.
- the framework 32 has
- the second number refers to the approximate surface area, or knuckle area, of the paper side network surface 34a.
- the papermaking belt is constructed so the surface area, or knuckle area, of the backside network surface 35a is approximately 65%.
- conduits in the 300 linear Idaho 35% knuckle area pattern are shown in FIG. 19.
- the following lengths and radiuses are used: di is .0425 inches (1.0795) mm, d2 is
- a is 1.6892 millimeters (.066506 inch), b 1.2379 mm (0.048737 inch), c 0.28153 mm (.011084 inch), d 0.92055 mm (.036242 inch), and e 0.30500 mm (.012008 inch).
- the conduits 36 have a channel portion 41 which lies between the conduit openings 42 and 43. These channel portions 41 are defined by the walls 44 of the conduits 36. The overall characteristics of these channel portions 41 and the walls 44 are shown in FIGS. 2 - 4.
- FIGS. 2 - 4 show that the holes or channels
- conduits 36 are generally discrete.
- discrete it is meant that the conduits 36 form separate channels, which are separated from each other by the framework 32.
- the separation of the conduits 36 is particularly evident in the plan view of Figure 2.
- the conduits 36 are described as being “generally” discrete, however, because as shown in FIG. 34B, for example, the conduits 36 may not be completely separated from each other along the second surface 35 of the framework 32 when passageways 37 are present in the backside network 35a.
- the conduits 36 are also shown to be isolated in that there is no connection within the body of the papermaking belt 10 between one conduit 36 and another. This isolation of one conduit 36 from another is particularly evident in the cross-sectional views of FIGS. 3 and
- FIGS. 3 and 4 show the orientation of the conduits 36 in the framework 32.
- the conduits 36 have a vertical axis which is designated Ay.
- the vertical axis Ay 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 A v determines the orientation of the conduits 36 in the framework 32 relative to the surfaces 34 and 35 of the framework 32.
- the vertical axis Ay does not always have a truly vertical orientation; it is merely relatively vertical with respect to the longitudinal and transverse axes AL and A ⁇ of the conduits 36.
- the orientation of the vertical axis A v of the conduits 36 can range widely from an orientation in which the vertical axis Ay 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 Ay is oriented such that the conduits 36 are formed at an angle in the framework 32.
- the vertical axis A v of the conduits 36 is generally approximately perpendicular to the first and second surfaces 34 and 35 of the framework 32.
- the walls 44 of the conduits 36 can be relatively straight, curved, partially curved and partially straight, or irregular when viewed in cross-section. It should be noted that in the drawing figures other than FIG. 21 which show the walls 44 of the conduits 36, the walls 44 of the conduits 36 are shown schematically as
- the profile of the walls 44 of the conduits 36 may be nonlinear from the top surface 34 of the framework 32 to the bottom surface 35 of the framework 32.
- 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 approximately at the points which have been marked with reference numeral 48.
- the points marked with reference numeral 48 are the
- 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 » 3 o photosensitive resin into the framework 32.
- the ultraviolet light used to cure the resin is supplied by light sources which are ' positioned above the paper-facing side 51 of the reinforcing structure and the liquid photosensitive resin coating on top of the paper facing side 51.
- the light rays diffuse or scatter to a 5 certain extent when they encounter the strands of the reinforcing structure 33 causing the photosensitive resin to cure in an irregular manner.
- 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 can vary from cases in which the walls 44 are parallel to each other to cases in which the walls 44 are tapered either outwardly or tapered inwardly from the top surface 34 of the framework 32 to the bottom surface 35 of the framework 32.
- 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 also be tapered.
- the term “outwardly” refers to the relationship in which the distance between the opposed walls 44, or interior walls 4 * 4a changes from a lesser value to a greater value.
- the term “inwardly” refers- to the opposite relationship (that is, a relationship in which the distance between the walls 44, or interior walls 44a changes from a greater to a lesser value).
- FIGS. 1A and B show one embodiment of the conduits 36 in which the walls 44 of the conduits 36 are parallel to each other.
- FIGS. 2-4 show a preferred embodiment of the present invention in which the walls 44 forming the inside of the conduits 36 are tapered inwardly from the top surface 34 of the framework 32 to the bottom surface 35 of the framework 32.
- the interior walls 44a of the framework 32 will bear the opposite relationship to each other.
- 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.
- 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
- the interior walls 44a are tapered such that the surface area of the
- paper side network 34a (first surface knuckle area ANI) is approximately 35% of the total surface area of the framework, and the surface area of the backside network 35a (second surface knuckle area AN2) s approximately 65% of the total surface area of the backside 12 of the papermaking belt 10 of the present
- the angle of the taper, a ⁇ shown in FIG. 21, of the walls 44 of the conduits 36 is approximately 15 degrees from vertical .
- FIGS. 3 and 4 The relationship between the framework 32 and the reinforcing structure 33 is shown in FIGS. 3 and 4. As shown in FIGS. 3 and 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
- reinforcing structure 33 is located more near the backside 12 of the papermaking belt 10.
- the portion of the resin framework 32 covering the reinforcing structure 33 is referred to as "the overburden" and is designated as t 0 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.
- 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 overburden t 0 is between about 4 mils and about 30 mils (.102 mm and .762 mm).
- 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 overburden t 0 be between about 2 mils and about 250 mils thick (.051 mm and 6.35 mm). 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 and the second surface 35 of the framework.
- 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.
- backside texturing or “backside texture”
- 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 10 such a planar surface.
- FIGS. 22A through 22C show that a backside texture can be provided by different portions of a papermaking belt when the belt comprises a framework and a reinforcing structure. It should be understood, however, that the particular types of backside texture
- FIGS. 22A through 22C will not necessarily be found in the papermaking belt 10 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, 11A, 11B, and in some of the other figures which follow.
- 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 33; or, by both the passageways 37
- passageways means spaces through which air may pass.
- the term “passageways” shall not be construed to include spaces which are of any particular shape and size.
- the passageways 37 described herein are not limited to spaces which resemble tunnels and the like in shape.
- the term "surface texture 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 in such a surface.
- the irregularities 38 comprise those portions which constitute nonregular or uneven portions in the backside network 35a of the second surface 35 of the framework 32.
- the surface texture irregularities 38 can be any discontinuities, or breaks in the resinous material 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.
- FIGS. 22A through 22C 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.
- the structural components 40a such as the knuckles and yarns of the woven reinforcing structure define 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 P .
- the plane P D 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 machine-facing side 52 of the reinforcing structure 33 (such as backside knuckles 105 D 2) define a plane which is designated * P 2-
- ⁇ 2 is referred to herein as "the plane defined by the machine-facing side of the reinforcing structure.”
- machine-facing side 52 of the reinforcing structure 33 cross-section has a specific contour or shape.
- the contour of the machine-facing side 52 of a woven reinforcing structure 33 is defined by some of the warp yarns 53 and some of the weft yarns 54 (which comprise the structural
- FIGS. 22A, B, and C show that portions of some of the warp yarns
- raised portions 120 refers to those portions of the
- 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).
- the raised portions 120 in FIGS. 22A-22C are more specifically shown to be 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, such as knuckles 105b2-
- 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 interwoven 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 same yarns which form the machine-side knuckles 1052- In addition, as shown in FIG.
- the reinforcing structure 33 when the reinforcing structure 33 is comprised of yarns having round cross-sections, and the bottoms of the yarns may lie in the plane Pfc > 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 A wp of the warp yarns 53 in the second warp layer D.
- FIGS. 22A-22C also show that certain of the raised portions, 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 Pj ⁇ 2 than other raised portions 120.
- FIGS. 22A-C show that in 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 .”» which defines a plane P r .
- the plane P r is referred to as the plane defined by the raised portions which form the raised surface.
- 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 variation of the reinforcing structure 33 depicted in FIG. 22D, the warp yarns 53 in the second warp layer D may even lie in the same plane as the plane defined by the machine-facing side of the reinforcing structure P ⁇ - In that case, they will not be inwardly-spaced at all.
- FIGS. 22A-22C The alternative ways in which the passageways 37, the surface texture irregularities 38 and the characteristics of the machine-facing side 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.
- the texture is provided entirely by the passageways 37 that provide surface texture irregularities 38 in the backside network 35a 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 issue when they are so positioned even though there are portions of the reinforcing structure 33 which lie within the conduits 36, and as a result will not have a resinous material on either side.
- the backside texture can be provided partially by the passageways 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 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.
- 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 texture”; and a combination of both "positive and negative backside texture”.
- positive backside texture it is meant that the passageways 37 extend from the plane P D defined by the backside 12 of the belt 10 toward the plane defined by the machine-facing side of the reinforcing structure P
- FIG. 22A 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 P
- the passageways 37 are positioned outward of the plane defined by the machine-facing side of the reinforcing structure P ⁇ .
- the surface texture irregularities 38 extend outward from the plane defined by the machine-facing side of the reinforcing structure Pfc -
- negative backside texture it is meant that the passageways 37 extend inward from the plane defined by the machine-facing side of the reinforcing structure Pt ⁇ ? toward the plane defined by the paper-facing side of the reinforcing structure Py.
- ⁇ 2 will be the same.
- positive and negative backside texture By “positive and negative backside texture”, as shown in FIG. 22C, it is meant that both types of passageways described above are present. Thus, some of the passageways 37 are disposed inward of the plane defined by the machine-facing side of the reinforcing structure P
- the wear surface of belts which have a positive backside texture will (at least at first) be comprised entirely of a resinous material.
- 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 combination of the machine-facing side 52 of the reinforcing structure 33 and the resin from the framework 32 which has been worn to a level even with the plane Pt ⁇ - 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.
- 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.
- the 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.
- negatively textured belts may have passageways 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.
- belts having a negative backside texture will generally continue to allow air to escape across their backside 12 to a certain extent after having become worn.
- 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.
- the wear surface as in the case of the belt shown in FIG. 22A, will, become virtually the same as the plane defined by the machine-facing side of the reinforcing structure P ⁇ .
- One difference between the belts shown in FIGS. 22A and 22C, however, is that because of the negative texturing there will still be passageways 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 the present invention to preserve a textured wear surface on the backside after the initial texture has been worn down.
- the texture is formed on the backside 12 of the papermaking belt 10 by exposing the liquid photosensitive resin to light of an activating wavelength through the reinforcing structure 33.
- the first portion Poi of the reinforcing component 40 prevents portions of the photosensitive resinous material from curing to form passageways 37 and surface texture irregularities 38 in the backside network 35a of the second surface 35 of the framework 32.
- the location, characteristics, and distribution of the passageways 37 and the irregularities 38 in the papermaking belt are, therefore, generally described with respect to the reinforcing structure 33.
- the definitions of several terms will be provided which will serve as references when describing the location, characteristics, and distribution of the passageways 37 and the surface texture irregularities 38 with respect to the reinforcing structure 33.
- 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 passageways 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.
- the projected area of a passageway 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 Ai-
- the projected area of a surface texture irregularity 38 refers to the area defined by the projection of the irregularity
- 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 z-direction.
- 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 projected area, or, even partially above, and partially below the element.
- 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 passageways 37 and the surface texture irregularities 38 described above. Examining FIGS. 12 and 12A from left to right, the first passageway 37 shown lies partially within a projected warp area A W p. Part of this passageway 37 also lies outside of the projected warp area A W p. To the right of the first passageway 37 is an irregularity 38. The irregularity 38 shown in FIGS. 12 and 12A lies within a projected warp area A W p. To the right of the irregularity 38 is a third passageway 37. The third passageway lies entirely within a projected interstitial area A p j. A fourth passageway 37 is shown to the right of the third passageway 37. The fourth passageway 37 lies entirely within a projected warp area A W p.
- the second factor results from the fact that the position of the passageways 37 and the surface texture irregularities 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 direction of the light source may be slightly different from the projection of the same areas in the z-direction.
- the passageways 37 are openings for fluid, or more specifically, air, or air and water, to pass along the second surface 35 of the framework 32.
- the irregularities 38 are the portions of the backside network 35a of the framework 32 which surround the passageways 37.
- the passageways 37 themselves comprise surface texture irregularities because they are also discontinuities or irregularities in the backside network 35a of the framework 32.
- both the passageways 37 and the irregularities 38 are distinct from the conduits 36 which pass through the framework 32.
- distinct from the conduits, it is 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.
- the holes 41 formed by the conduits 36 are not intended to be classified as passageways or surface texture irregularities.
- FIG. 21 is an exaggerated schematic view of a portion of a papermaking belt which shows passageways 37 and surface texture irregularities 38 of a variety of different shapes.
- FIG. 21 is an exaggerated schematic view of a portion of a papermaking belt which shows passageways 37 and surface texture irregularities 38 of a variety of different shapes.
- the particular backside texturing shown in FIG. 21 may not actually be found in the 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 invention 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.
- the passageways 37 can have sides, which * are designated generally by reference numeral 66. These sides can be
- the sides 66 of the passageways 37 can range from relatively vertical (i.e., oriented in the z-direction) to relatively horizontal (oriented in the x and y directions).
- the angle that a side 66 forms relative to the z-direction has been designated as a s in FIG. 21. It is to be understood,
- angle a s will vary depending on the reference points used to measure the angle a s formed by the side 66.
- each passageway 37 can have various numbers of
- the number of sides 66 can vary from essentially one continuous curved wall to virtually 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.
- passageways 37 which have relatively vertical walls 66a will have a side which resembles a roof, 66b.
- One side of the passageways 37 will always be open.
- the open sides are designated 66c in FIG. 21.
- the passageways 37 are generally -> 30 extremely minute, they have a finite height hp, width Wp, spacing s p , and cross-sectional area A xp .
- the height h p of a passageway 37 is the distance, measured in the z-direction, from the plane defined by the backside of the belt P to a point, such as 66d, on the interior of the passageway 37.
- the height h p of different portions of an individual passageway 37 may vary across the width of the passageway 37.
- 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 w p 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 curved surface, the width p of the passageway is the distance 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 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 A X p is represented by a cross-hatched area in FIG. 21.
- the cross-sectional area of a passageway A p 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 A p ⁇ of the individual passageways 37 is important in that it is these- areas through which air escapes when the papermaking belt of the present invention 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 s p 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
- 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 passageways 37, shown by the arrow in FIG. 21, is the distance 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 to the next adjacent reference point 109 which lies on the opposite coterminous side 67a of the same i ' rregularity 38.
- the overall 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 distribution 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.
- 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.
- regular means that the spacing between adjacent passageways s p is approximately the same across the entire backside network 35a.
- An example of regularly-spaced passageways 37 are the passageways 37 of the belt 10 shown in FIGS. 3 and 4. The belt 10 shown in FIGS.
- FIGS. 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 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" portions 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 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 reinforcing area AR or in the projected open area A 0 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 is meant that while the passageways 37 can be found at virtually any particular place on the backside network
- the passageways 37 do not necessarily cover the entire backside network 35a.
- the surface texture irregularities 38 of the present invention can have sides 67 with an infinite number of different shapes.
- the sides 67 of the irregularities 38 can be curved or relatively straight when viewed in cross-section, or partially curved and partially straight. Oftentimes, however, the sides 67 of the irregularities 38 are so irregular that they are not capable of precise definition.
- the sides 67 of the irregularities 38 can range from relatively vertical (i.e., sloped in the z-direction) 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-direction has been designated as ai in FIG. 21.
- the angle ai will depend on the reference points used to measure the angle ai formed by the side 67 of the irregularity 38.
- 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.
- the side(s) 67 of the irregularity 38 will appear as one continuous curved line when viewed in cross-section.
- 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 sides 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 independently-formed sides of the irregularities 38, and are designated 67b in the drawings. Oftentimes, these independently-formed sides 67b of the irregularities 38 will comprise a portion of the wear surface on the backside 12 of the belt 10.
- the irregularities 38 are generally extremely minute, they also have a finite height hi, width wi, spacing Si, and cross-sectional area A x ⁇ . As shown in FIG. 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 A x i of an irregularity 38 may be difficult to express.
- 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 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.
- the height hi 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.
- the height hi of different portions of an individual irregularity 38 may vary across the width of the irregularity 38.
- the height hi of the various irregularities 38 in the backside network 35a can vary from irregularity to irregularity.
- the width wi of an irregularity 38 is the distance, measured in the either the x-direction 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.
- the width wi of the irregularity is the distance 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 vary depending on the portion of the irregularity 38 at which the width is measured. In addition, the width of the various irregularities 38 in the backside network 35a can vary from irregularity to irregularity.
- the cross-sectional area of an irregularity A x i is also represented by a cross-hatched area in FIG. 21.
- the cross-sectional area of an irregularity A X i is the area measured on a given cross-section, of the portion of the irregularity 38 which lies between an imaginary line which passes through the reference point 110 and the plane defined by the backside of the belt b-
- the irregularities 38 also have a spacing si between adjacent irregularities 38. As shown in FIG. 21, the spacing between irregularities 38 in a given direction Si is the distance measured in the X-Y plane between the reference point 109 which lies on the coterminous side 67 of one irregularity 38 to the reference point
- the overall pattern of spacing between the irregularities 38 determines the distribution of the irregularities 38.
- the irregularities 38 can be distributed in an unlimited number of ways across the backside network 35a of the framework 32.
- the distribution of the irregularities 38 can be random, uniform, regular, or in some particular pattern.
- the term "uniform” means that the density (or number) of irregularities 38 is approximately the same over an entire surface, even though the irregularities 38 do not form any particular pattern.
- regular means that the spacing between adjacent irregularities si is approximately the same across the entire backside network 35a.
- the irregularities 38 may be distributed across "generally all" portions of the backside network 35a.
- 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 particular place on the backside network 35a, the irregularities 38 do not necessarily cover the entire backside network 35a. Examples of the various different distributions of the irregularities 38 are shown in the same figures of the accompanying drawings which show the corresponding types of distributions of the passageways 37.
- the irregularities 38 may also be described as either projections or depressions in the backside network 35a of the framework 32.
- an irregularity 38 is referred to as either a projection 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 P ⁇ . Any irregularity 38 which projects outward from this plane in the z-direction is a projection. Any irregularity 38 which lies inward in the z-direction from the plane
- 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.
- the particular characteristics of the backside texture also depend on the characteristics of the opaque first portion Poi-
- the particular characteristics of a representative belt made with the process described herein are shown in the enlarged photographs of FIGS. 34A-C, and will be discussed in conjunction with the description 5 of the method used to make the belt shown in the photographs.
- FIGS. 11A and 11B the passageways 37 are positioned predominantly in the first projected area A] formed by the projection of the opaque first portion Poi.
- FIGS. 11A and 1IB also show that the plane defined by the backside of the belt Pb and the plane defined by the machine-facing side of the
- FIGS. 11A and 11B also show that the heights of the passageways 37 extend inward from the plane defined by the machine-facing side of the reinforcing structure Pfc2 to the bottom of the structural components 40a which comprise the first
- FIG. 23A is a representation of what was believed to occur when the prior papermaking belts 10a 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.
- each of the papermaking belts 10a and 10, 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 belt 10 is textured whereas the backside network 35a of the framework 32 of belt 10a is smooth.
- 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 their backsides. For simplicity and clarity, the other differences have been omitted from FIGS. 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.
- 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 24c ⁇ , 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.
- a lip such as leading vacuum box surface lip 24b 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 removes some of the water from the embryonic web 18 and deflects and rearranges the fibers 18a of the embryonic web into the conduits 35 of the framework 32.
- the textured backside network 35a 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 vacuum box lip 24b -
- the papermaking belt 10 can take a variety of forms. While the method of construction of the papermaking belt 10 is immaterial so long as it has the characteristics mentioned above, certain methods have been discovered to be useful. By way of background, a detailed description of the process of making the "deflection member" (or “foraminous member") which does not have the improvements disclosed herein is set forth in U.S. Patent 4,514,345, entitled
- FIG. 25 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.
- 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 passageways 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 in the following drawing figures.
- the overall 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 (or “casting surface") 72.
- 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 t-he coating is positioned 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 coating 70 is distributed so portions of the second surface 35' of the coating are positioned between the opaque first portion Poi of the reinforcing component 40 and the working surface 72 of the forming unit 71.
- 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 overburden t 0 '.
- the thickness of the overburden t 0 ' is controlled to a preselected value.
- 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 and through the reinforcing structure 33.
- the portions of the resin which have been shielded or protected from light by the opaque regions 74a of the mask 74 and by the first portion oi of the reinforcing structure 33 are not cured by the exposure to the light.
- the remaining portions of the resin are cured.
- conduits 36 which pass through the cured resin framework 32, and passageways 37 that provide surface texture irregularities 38 in the backside network 35a which correspond to those portions of the second surface 35' of the coating 70 which were prevented from curing by the first portion Poi of the reinforcing structure 33.
- the first step of the process of the present invention is providing a forming unit 71 with a working surface 72.
- the forming unit 71 shown in FIG. 25 has working surface which is designated 72.
- 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 its surface so that the necessary steps can be accomplished as the drum is rotating.
- the 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.
- FIG. 27 is an enlarged schematic view of one alternative version of the casting process shown in FIG. 25.
- FIG. 27 also first illustrates that in the preferred embodiment of the present 0 process, a hard rubber cover 91, preferably approximately one inch
- the forming unit 71 is covered by a barrier film 76 which prevents the working surface 72 from being contaminated with resin.
- the barrier film 76 also facilitates the removal of 5 the partially completed papermaking belt 10' from the forming unit
- the barrier film 76 can be any flexible, smooth, planar material.
- the barrier film 76 can be made from polypropylene, polyethylene, or polyester sheeting.
- the barrier film is made from polypropylene and is from about 0.01 0 to about 0.1 millimeter (mm) thick.
- the barrier film is made from polypropylene and is from about 0.01 0 to about 0.1 millimeter (mm) thick.
- 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 5 chemically treated to prevent the resin from adhering to its surface and also to ensure that the resin spreads evenly across its surface.
- this chemical treatment is a corona treatment.
- the corona treatment used in the preparation of the barrier film 76 involves apply an electrical discharge to the Q barrier film 76 prior to its installation in the apparatus 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 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 discarded. In an alternative arrangement, the barrier film 76 can take the form of an endless belt which travels about a series of return rolls where it is cleaned and reused.
- the forming unit 71 is also provided with a means for insuring that barrier film 76 is maintained in close contact with its working surface 72.
- the barrier film 76 can be, for example, adhesively secured to working surface 72.
- the barrier film 76 can be secured to the working surface 72 by a vacuum applied through a plurality of closely-spaced, small orifices distributed across the working surface 72 of the forming unit 71.
- the barrier film 76 is held against the working surface 72 by a conventional tensioning means which is not shown in FIG. 25.
- the second step of the process of the present invention is providing a reinforcing structure 33, which has certain elements and characteristics (described below), for incorporation into the papermaking belt.
- FIG. 27 shows that the reinforcing structure 33 has a paper-facing side 51, a machine-facing side 52 opposite the paper-facing side 51, interstices 39, and a reinforcing component 40 comprised of a plurality of structural components 40a.
- a first portion Poi of the reinforcing component 40 has a first opacity Oi and a second portion P02 of the reinforcing component 40 has a second opacity 02 less than the first opacity Oi.
- the first opacity Oi is sufficient to substantially prevent curing of the photosensitive resinous material when the photosensitive resinous material is in its uncured state and the first portion is positioned between the photosensitive resinous material and an actinic light source 73.
- the second opacity O2 is sufficient to permit curing of the photosensitive resinous material.
- the first portion Poi defines a first projected area Ai, a portion of which is shown in FIG. 27.
- 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.
- the reinforcing structure 33 is the woven, multilayer fabric shown in FIGS. 6 - 11 which is characterized by warp yarns which are vertically stacked directly on top of one another, and the first portion Poi comprises at least some of the warp yarns 53 in the second warp layer D.
- 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 DI 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 invention, there are conventional guide rolls, return rolls, drive means, support rolls and the like which are not shown in FIG. 25. Third Step
- 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 illustrated, traveling the reinforcing structure 33 over the working surface 72 of the forming unit 71).
- the third step will involve bringing at least a portion 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 reinforcing structure 33 and the forming unit 72..
- 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.
- 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.
- the liquid photosensitive 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.
- At least a portion of the machine-facing side 52 of the reinforcing structure 33 (e.g., the machine side knuckles) is placed directly in contact with the working surface 72 of 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.
- the fourth step in the process is applying a coating of liquid photosensitive resin 70 to at least one side of the reinforcing structure 33.
- 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 distributed 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 overburden t 0 '.
- the coating 70 is also distributed so that portions of the second surface 35' of the coating 70 are positioned between the first portion Poi of the reinforcing component 40 and the working surface 72 of the forming unit 71.
- 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.
- UV ultraviolet
- References containing more information about liquid photosensitive resins include Green et al . , "Photocross-linkable Resin Systems", J. Macro-Sci . Revs. Macro Chem. C21 (2), 187-273 (1981-82); Bayer, "A Review of Ultraviolet Curing Technology", Tappi Paper Synthetics Conf.
- antioxidants are added to the resin to protect the finished papermaking belt 10 from oxidation and increase the life of the papermaking belt.
- Any suitable antioxidants can be added to the resin.
- the preferred antioxidants are Cyanox 1790, which is available from American Cyanamid of Wayne, New Jersey 07470, and Iraganox 1010, which is made by Ciba Geigy of Ardsley, New
- both antioxidants are added to the resin.
- the antioxidants are added in the following respective amounts, Cyanox 1790 1/10 of 1%, and Iraganox 1010 8/10 of 1%. Both antioxidants are added so the papermaking belt 10 of the present invention is protected from several different species of oxidizing agents.
- the liquid photosensitive resin 70 is applied 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 "prefill" 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.
- a first coating of liquid photosensitive resin is applied to at least the machine-fac ng 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.
- the first coating substantially fills the void areas 39a of the reinforcing structure 33.
- the void areas are shown best in FIG. 22D.
- the term "void areas" 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 P
- the void areas 39a thus comprise the interstices 39 and any other open spaces which lie between the planes Pfci and P ⁇ -
- 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 coating of liquid photosensitive resin 70 to the paper-facing side 51 of the reinforcing structure 33. It is necessary that liquid photosensitive resin 70 be evenly applied across the width of 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 coating 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.
- the single coating 70 is distributed so that: at least a portion of the second surface 35' of the coating is positioned adjacent the working surface 72 of the forming unit 71; the paper-facing side 51 of the reinforcing structure 33 is positioned between the first and second surfaces
- the stages at which the liquid photosensitive resin 70 is applied to the reinforcing structure 33 do not necessarily always occur in time sequence immediately after the third step set forth above. That is, 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 72 of the forming unit 71 if one is looking at a particular portion of the reinforcing structure 33 which is traveling around the reinforcing structure return roll 78a toward the forming unit 71. On the other hand, if one is looking at the overall process of assembling the apparatus shown in FIG.
- the second stage of applying the photosensitive resin 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 and bringing the reinforcing structure 33 into contact with the working surface 72 of the forming unit 71) could instead occur simultaneously, or that the photosensitive resin could be applied to the top surface (that is, the paper-facing side 51) of the reinforcing structure before the point where the reinforcing structure 33 is first placed in contact with the forming unit 71.
- the process 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 drawings.
- the fifth step in the process of this invention is controlling the thickness of the overburden t 0 ' of the resin coating 70 to a preselected value.
- this step takes place at approximately the same time, i.e., simultaneously, with the second stage of applying a coating of liquid photosensitive resin to the reinforcing structure 33.
- the preselected value of the thickness of the overburden corresponds to the thickness desired for the papermaking belt 10. This thickness, also naturally, follows from the expected use of the papermaking belt. When the papermaking belt 10 is to be used in the papermaking process described hereinafter, it is preferred
- the thickness, t, of the papermaking belt 10 be from about
- Any suitable means for controlling the thickness can be used.
- Ths means used for controlling the thickness of the overburden illustrated in FIG. 25 is the use of nip roll 81, which also serves as a mask guide roll.
- the clearance between the nip roll 81 and the forming unit 71 can be controlled mechanically by any conventional means which are not shown.
- the sixth step in the process of this invention can be 25 considered as either a single step or as two separate steps which comprise: (1) providing 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 between the coating of ⁇ 30 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 photosensitive resin 70.
- the mask 74 can, alternatively, 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 actinic light source. Naturally, if certain areas are shielded, it follows that certain areas are not shielded and that liquid photosensitive resin 70 in those unshielded areas will be exposed later to activating light and will be cured. After the steps described herein are performed, 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 suitable for use as a mask 74.
- the flexible film can be polyester, polyethylene, or cellulosic or any other suitable material.
- the opaque regions 74a should be opaque to light which will cure the photosensitive liquid resin.
- the opaque regions 74a should be opaque to light having a wavelength of between about 200 and about 400 nanometers.
- the opaque regions 74a can be applied to mask 74 by any convenient means such as by a blue printing (or ozalid processes), or by photographic or gravure processes, flexographic processes, or rotary screen printing processes.
- 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 from one supply roll transverse through the system to a takeup roll, neither of which is shown in the illustration 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.
- the control of the thickness of the resin 70 and the positioning of the mask 74 occur simultaneously.
- the seventh step of the process of this invention comprises curing the unshielded portions of liquid photosensitive resin in those regions left unprotected by the transparent regions 74b of the mask 74 and curing those portions of the coating 70 that the second portion P02 of the reinforcing structure 33 permits the curing of, and leaving the shielded portions and those portions of the coating positioned between the first portion Poi of the reinforcing structure 33 and the working surface 72 of the forming unit 71 uncured by exposing the coating of liquid photosensitive resin 70 to light of an activating wavelength from the light source 73 through the mask 74 to form a partially-formed composite belt 10'.
- 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.
- the liquid photosensitive resin 70 is exposed to light of an activating 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 photosensitive resin 70. That wavelength is a characteristic of the liquid photosensitive resin 70. Any suitable source of illumination, such as mercury arc, pulsed xenon, electrodeless, and fluorescent lamps, can be used. As described above, when the liquid 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 unexposed regions remain fluid.
- the intensity of the illumination and its duration depend upon the degree of curing required in the exposed areas.
- the absolute values 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.
- Merigraph resin EPD 1616 this amount ranges from approximately 100 to approximately 1,000 millijoules/cm 2 , with the preferred range being between approximately 300 and approximately 800 millijoules/cm 2 , and the most preferred range being between approximately 500 and approximately 800 mill ijoules/cm 2 .
- the intensity of the exposure and the angle of incidence of the light can have an important effect on the presence or absence of taper in the walls 44 of the conduits 36. In addition to 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
- air permeability This permeability to air (air permeability) 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) conduit walls 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.
- the angle of incidence of the light is collimated 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 radiation 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).
- 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.
- 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.
- the eighth step in the process in the present invention is removing substantially all of the uncured liquid photosensitive 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.
- 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 light 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 which correspond to the portions of the second surface 35' of the coating which were prevented from curing by the first portion PQI of the reinforcing structure 33.
- the mask 74 and the barrier film 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 70 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'.
- 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 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 station drain 85.
- the composite belt 10' At the second resin removal shoe 83b, any residual wash liquid and uncured liquid resin is removed from the composite belt 10' by the application of vacuum.
- 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.
- post-cure step 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 durability of the cured resin framework 32.
- the post-cure step takes place at the place designated by the reference to the following FIG. 26.
- FIG. 26 is an enlarged schematic representation of this post-cure step.
- the composite belt 10' is subjected to a second exposure of light of the activating wavelength by post cure
- 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 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 35 of the framework 32 of the finished papermaking belt 10.
- all of the UV light has been supplied from sources located above the top side of the composite belt 10'.
- the amount of UV 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.
- the dosages specified above for the precure 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 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 relatively great thickness.
- 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.
- each step will be discussed in detail in reference to FIG. 1. It is to be understood, however, that the steps described below are intended to assist the reader in understanding the process of the present invention, and that the invention is not limited to processes with only a certain number or arrangement of steps. In this regard, it is noted that it is possible to combine the following steps so that they are performed concurrently. Likewise, it is possible to separate the following steps into two or more steps without departing from the scope of this invention.
- FIG. 1 is a simplified, schematic representation of one embodiment of a continuous papermaking machine useful in the practice of the papermaking process of the present invention.
- the papermaking belt 10 of the present 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 arrangement of its belts to the papermaking machine disclosed in U.S. Patent No. 3,301,746, issued to Sanford and Sisson on January 31, 1967, which is incorporated by reference herein.
- the first step in the practice of the papermaking process of the present invention is the providing of an aqueous dispersion of papermaking fibers 14.
- the equipment for preparing the aqueous dispersion of papermaking fibers 14 is well-known and is therefore not shown in FIG. 1.
- the aqueous dispersion of papermaking fibers 14 is provided to a headbox 13.
- a single headbox is shown in FIG. 1.
- the headbox(es) and the equipment for preparing the aqueous dispersion of papermaking fibers are preferably of the type disclosed in U.S. Patent No. 3,994,771, issued to Morgan and Rich on November 30, 1976, which is incorporated by reference herein.
- the preparation of the aqueous dispersion and the characteristics of the aqueous dispersion are described in greater detail in U.S. Patent 4,529,480 issued to Trokhan on July 16, 1985, which is incorporated herein by reference.
- the aqueous dispersion of papermaking fibers 14 supplied by the headbox 13 is delivered to a forming belt, such as the Fourdrinier wire 15 for carrying out the second step of the papermaking process.
- the Fourdrinier wire 15 is supported by a breast roll 16 and a plurality of return rolls designated 17 and
- the Fourdrinier wire 15 is propelled in the direction indicated by directional arrow A by a conventional drive means which is not shown in FIG 1.
- 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.
- the second step in the papermaking process is forming an embryonic web 18 of papermaking fibers on a foraminous surface from the aqueous dispersion 14 supplied in the first step.
- the Fourdrinier wire 15 serves as the foraminous surface in the papermaking machine shown in FIG. 1.
- the "embryonic web” is the web of fibers which is subjected to rearrangement on the papermaking belt 10 of the present invention during the course of the papermaking process.
- the embryonic web 18 is formed from the aqueous dispersion of papermaking fibers 14 between breast roll 16 and return roll 17 by depositing the aqueous dispersion 14 onto the Fourdrinier wire 15, and removing a portion of the aqueous dispersing medium.
- Conventional 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.
- 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.
- This third step is to bring the embryonic web
- the embryonic web 18 is brought into contact with the papermaking belt 10 of the present invention 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.
- 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 and 19b, impression 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.
- water showers 102 and 102a 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 in the papermaking process.
- Associated with the papermaking belt 10 of the present invention, and also not shown in FIG. 1 are various additional support rolls, return rolls, 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 will be discussed in conjunction with the third step for convenience.
- the emulsion distributing roll 21 and the emulsion bath 23 continuously apply an effective amount of a chemical compound (or compounds) to the belt 10 during the. papermaking process.
- the chemical compounds can be applied to the papermaking belt 10 at any point during the papermaking process, although it is preferred the chemicals be added to the paper-contacting side 11 of the belt 10 at a particular point in the belt's revolution when the belt 10 is not carrying a paper web.
- the chemical compound or compounds are preferably applied to the papermaking belt 10 in the form of an emulsion, such as by emulsion 22 shown in FIG. 1.
- emulsion 22 shown in FIG. 1.
- These compound(s) serve the dual purpose of: (1) 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) treating 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 antioxidant).
- the chemical compound(s) are applied uniformly to the paper-contacting side 11 of the belt 10 so substantially the entire paper-contacting side 11 benefits from the chemical treatment.
- the preferred emulsion 22 is primarily comprised of five compounds, although it is contemplated that other or additional suitable compounds could be used.
- the preferred composition contains water, a high-speed turbine oil known as "Regal Oil”, Dimethyl distearyl am oniu chloride, cetyl alcohol, and an antioxidant.
- the term "Regal Oil” refers to the compound which is comprised of approximately 87% saturated hydrocarbons and approximately 12.6% aromatic hydrocarbons with traces of additives, which is manufactured as product number R & 068 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.
- ADOGEN is used in the emulsion as a surfactant to emulsify or stabilize the oil particles (of the Regal Oil) in the water.
- 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.
- cetyl alcohol refers to a C ⁇ 6 linear fatty alcohol. Cetyl alcohol is manufactured by The Procter & Gamble
- Cetyl Alcohol like ADOGEN is used as a surfactant in the emulsion utilized in the present invention.
- antioxidant refers to a compound, which when applied to the surface of an article, the surface of which is subject to oxidation, reduces the article's tendency to oxidize (i.e., combine with oxygen).
- antioxidant refers to compounds which reduce the tendency of the cured resin network of the papermaking belt 10 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 fourth step in the papermaking process involves 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 fibers in the embryonic web 18 into the desired structure.
- a fluid pressure differential (or "differential fluid pressure"), as will also be more fully described herein, is by disposing the embryonic web 18 in such a way that the web is exposed to the vacuum through the conduits 36 by the application of vacuum from the backside 12 of the papermaking belt 10 of the present invention.
- this preferred method is illustrated by the use of vacuum pickup shoe 24a and the multislot vacuum box 24.
- 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.
- the fluid pressure differential will typically be a negative pressure (i.e., less than atmospheric pressure), and the suitable fluid is air.
- positive pressure in the form of air or steam pressure can be applied through Fourdrinier wire 15 to the embryonic web 18 in the vicinity of pickup shoe 24a or vacuum box 24.
- the means for applying such a positive pressure are conventional, and are, therefore, not shown in FIG. 1.
- FIG. 1A 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.
- the embryonic web 18 is still in contact with the Fourdrinier wire 15 (or more specifically, sa ' ndwiched between the Fourdrinier wire 15 and the papermaking belt 10 of the present invention).
- FIG. 1A only one conduit.36 is shown and the embryonic web 18 is shown associated with the paper side network surface 34a of the framework 32 papermaking belt 10.
- IB 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 embodiment of the present invention as described above, the profile of the walls 44 of the conduits is somewhat more complex.
- the opening of conduit 36 in the first surface 34, first conduit opening 42, and its opening in second surface 35, second conduit opening 43 are shown essentially equal in size and shape when in the preferred embodiment of the present invention the openings of the conduits in the second surface 35 will be smaller than the openings of the conduits in the first surface 34 of the framework 32.
- FIG. IB like FIG.
- FIG. 1A is a simplified cross-sectional view of a portion of the papermaking belt 10. This view, however, illustrates the transformation of the embryonic web 18 into intermediate web 25 by the deflection of the fibers of the embryonic web 18 into the conduit 36 under the application of a fluid pressure differential.
- FIG. IB shows that a substantial portion of the fibers in embryonic web 18 and, thus, embryonic web 18 itself, has been displaced into the conduit 36 below the paper side network surface 34a into conduit 36 to form the intermediate web 25. Rearrangement of the individual fibers in embryonic web
- FIG IB also shows that at the point when the fibers in the embryonic web 18 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 15 immediately after leaving the vicinity of the pickup shoe 24a.
- conduits 36 Water removal occurs under the action of the fluid pressure differential. It is important, however, that there be essentially no water removal from the embryonic web 18 prior to the deflection of the fibers into the conduits 36. As an aid in achieving this condition, at least those portions of the conduits 36 surrounded by the paper side network 34a, are generally isolated from one another. This isolation, or compartmentalization, of conduits 36 is of importance to insure that the force causing the deflection, such as an applied vacuum, is applied relatively suddenly and in a sufficient amount to cause deflection of the fibers.
- the fifth step is traveling the papermaking belt 10 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 10 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 10 is generally in contact with the surface of the vacuum source as the belt 10 travels over the vacuum source.
- the step of traveling the papermaking belt 10 of the present invention over the vacuum source reduces the undesirable accumulation of paper fibers on the vacuum box lips. While 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 suddenness of the deflection during the preceding step.
- the deflection of the fibers is controlled by using a papermaking belt which has a 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 backside 12 is in contact with the surfaces of the pickup shoe 24a and the vacuum box 24.
- the backside network 35a of the belt 10 has passageways 37 which provide spaces through which at least some of the air leakage can enter.
- 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.
- these passageways 37 which provide surface texture irregularities 38 in the backside 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 action is believed to occur when the vacuum source has at least one- surface that the papermaking belt travels over during the deflection step.
- the cleaning of the surfaces of the vacuum dewatering equipment may be a step which inherently occurs in conjunction with the fifth step, or it may be considered to be a separate step. If considered as an additional step, this step would comprise contacting 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.
- the embryonic web 18 is in a state in which it has been subjected to a fluid pressure differential and deflected but not fully dewatered, thus it is now referred to as the
- the sixth step in the papermaking process is an optional step which comprises drying the intermediate web 25 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.
- flow-through dryers, nonthermal, capillary dewatering devices, and Yankee dryers are satisfactory.
- FIG. 1 A preferred method of drying the intermediate web 25 is illustrated in FIG. 1.
- 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.
- predried web 27 exiting the predryer 26 has a consistency of from about 30% to about 98%.
- 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 roll 20.
- 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.
- 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.
- 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.
- the eighth step in the papermaking process is drying the imprinted web 29.
- the imprinted web 29 separates from the papermaking belt 10 of the present invention 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 p.asses around papermaking belt 10 return rolls 19c, 19d, 19e, and 19f 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.
- 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.
- foreshortening refers to the reduction in length of a dry paper web which occurs when energy is applied 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 29 is adhered to a surface and then removed from that surface with a doctor blade 30. 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.
- creping adhesives can include any suitable glue, such as those based on polyvinyl alcohol. Specific examples of suitable adhesives are described in U.S. Pat. No. 3,926,716 issued to Bates on December 16, 1975, incorporated by reference herein.
- 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 particular means of glue application and the technique for applying the glue used in the practice of the present invention are conventional, 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.
- 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.
- the amount and character of backside texturing which must be present for the desired results 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.
- 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.
- 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
- FIG. 30 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. 30 for simplicity. These hoses and tubes are best seen in the side view of the device shown in FIG. 31.
- 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 59 in the first plate 58; a liquid-filled vacuum gauge 62; and, a flow meter 63.
- the plate which forms the top of the stand i.e., the first plate 58
- 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).
- a circle approximately 3.5 inches (8.89 cm) in diameter is inscribed 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 over 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 inches (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 5 to retain the sample of the belt which is being tested on the stand without unduly compressing the same.
- an adapter 61 fits inside the hole 59 in the first plate 58 so a tube or hose can be inserted into the hole 59 and retained therein.
- the adapter 61 has a short tube 64 which 10 extends from at least one of its ends. This tube 64 extends toward the opening of the hole 59 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 is 0.312 inches (0.793 cm).
- a hose 65a runs from the the other end of the adapter 61 to the bottom 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 150. As with most flow
- a suitable flow meter is one which is marked FM 102-05 manufactured by the Cole Par er 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 direction of the arrow V ⁇ .
- % source itself is conventional, and is, therefore, not shown in
- FIG. 31 There are several branches of the tube 68 which runs t 30 from the hose 65b to the vacuum source. Included on these branches are a shut-off valve 69a, a coarse adjustment valve 69b, and a fine adjustment valve 69c, as well as the liquid-filled vacuum gauge 62 which is calibrated for pressures of between 0 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.
- a section of the papermaking belt 10 is placed across the top of the hole 59 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
- 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 FIGS. 30 and 31, however, for purposes of illustration. In 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 plate 60 is then placed on top of the paper-contacting side 11 of the papermaking belt 10 to hold the belt in place and to cover 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 applied and the valves 69a, 69b, and 69c are adjusted so that the pressure differential measured by the vacuum gauge 62 is preset at approximately 7 inches (17.78 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 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 following 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
- the number which is read directly from the flow meter 63 is a measure of the X-Y leakage across the backside 12 of the section of the papermaking belt 10, or more particularly, of the volume of air which enters around the circumference of the second plate 60 (such as in the direction indicated by arrows L) and moves across the backside 12 of the section of the papermaking belt 10 being tested.
- the units of this reading have been named "Marlatts" after Henry Marlatt of
- the fluid passage capacity (or amount of air leakage measured using the test described above) should not be 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.
- the passageways 37 in the second surface 35 of the framework 32, together with the other elements which comprise the backside texture should be sufficient in size, or capacity, to permit at least about 1,800 standard cc/min.
- the amount of air leakage which is present in papermaking belts which will perform 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 450-550 cfm air permeability, the preferred minimum range of air permeabilities for the composite belt.
- 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 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 great as 250 Marlatts (approximately 8,400 standard cc/min.), or more.
- FIGS. 34A-C are enlarged photographs of an example of a papermaking belt 10 made according to the process of the present invention.
- the photograph of the belt shown in FIGS. 34A-C can be compared to the photographs of the prior smooth backsided belt shown in FIGS. 33A and B.
- the portions of the belts shown in the 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 believed to be fairly representative of the characteristics of the entire belt. This does not mean, however, that sections of the belt which are more representative of the overall characteristics of the entire belt than the portions of the belts depicted in the photographs, do not exist.
- the portions of the belts shown in the photographs will more than likely not correspond identically with the portions of the belt shown in the other photographs taken from different angles due to the difficulty of examining and photographing the minute features of such an article under magnification.
- the portions of the belt which form the paper-contacting side 11 and the backside 12 may not actually lie directly above and below each other in the belt 10.
- the cross-section photograph of the belt may not be a cross-section of the same portion of the belt shown in the top and bottom side photographs.
- FIGS. 33A and 33B are plan view photographs, each enlarged about 25 times actual size, of the paper-contacting side 11a and the backside 12a, respectively, of a papermaking belt 10a which does not contain the improvements disclosed herein.
- the belt shown in FIGS. 33A and 33B differs somewhat in dimensions from the belt formed by the process of the present invention because the belt shown in FIGS. 33A and 33B is a 711 linear Idaho belt.
- the belt shown in FIGS. 33A and B therefore, has smaller-sized conduits 36, and a greater number of conduits per square inch.
- the belt 10a shown in FIGS. 33A and B also differs in that it has a onolayer reinforcing structure.
- the backside 12a of the belt 10a shown in FIG. 33B shows one of the problems which occurred in casting belts having smaller conduits.
- the conduits 36 tended to close up on the backside 12a.
- the backside 12a of the belt 10a in FIG. 33B should appear nearly identical to the paper-contacting side 11a shown in
- FIG. 33A If the walls 44 of the conduits 36 are tapered, in the backside the conduits 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 imperfections in the belt which appeared to be greatly exaggerated in these photographs.
- backside 12 of the belt 10a shown in FIG. IB is examined macroscopically, the conduit openings in the backside 12a of the belt 10a appear to be very similar to the conduit openings in the paper-contacting side 11a of the belt 10a. However, such an examination of the belt 10a reveals that a very thin film of resinous material covers the conduits which may at least partially account for the differences in the appearance of the backside 12a of the belt 10a.
- FIGS. 34A-C depict a 300 linear Idaho 35% knuckle area belt which was made in accordance with the process of the present invention.
- the backside texture of the belt shown in these figures was created by giving all of the warp yarns 53 in the second warp layer D a first opacity 0 ⁇ .
- the first opacity O was provided to the warp yarns 53 in the second warp layer D by coating the individual yarns with an organic dye. More specifically, the coating was applied with a black ink marking pen. All of the photographs have been enlarged about 25 times the actual size of the belt 10.
- FIG. 34A is a photograph of the paper-contacting side 11 of the belt 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).
- FIG. 34B is a photograph of the backside 12 of the belt 10 shown in FIG. 34A.
- FIG. 34C is a cross-machine direction sectional view of the belt 10 shown in FIGS. 34A and 34B.
- FIG. 34A shows that the paper side network (upon which the paper web will be carried) is macroscopically monoplanar, patterned and continuous. As show in FIG. 34A, the paper side network 34a is also microscopically monoplanar, patterned and continuous at the level of magnification at which the photograph was taken.
- 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.
- the reinforcing structure 33 is the preferred multilayer reinforcing structure which has vertically stacked warp yarns 53. As shown in FIG. 34A, the interstices 39 are generally several times smaller than the conduits 36.
- the reinforcing structure 33 strengthens the framework 32 without interfering with the drainage of wa-ter and the passage of air through the conduits 36.
- FIGS. 34B and 34C shows the backside texturing which is formed by the process of the present invention. As shown in FIGS. 34B and 34C, the backside network 35a is discontinuous. Without the backside texturing formed by the process of the present invention, the backside network 35a would appear very similar to the paper side network 34a.
- the backside texturing produced by the process of the present invention comprises passageways 37 that provide surface texture irregularities 38 in the backside network 35a of the framework 32.
- the backside texture appears as a plurality of discontinuities in the backside network 35a. These discontinuities comprise the passageways 37.
- the passageways 37 are distributed fairly regularly and in a general pattern.
- the passageways 37 are positioned predominately over the warp yarns 53 which comprise the first portion oi of the reinforcing structure 33 (in other words, in the projected warp areas).
- the first portion Poi comprises the warp yarns 53 in the second warp layer D
- the first projected area Ai and the projected warp area will be the same.
- FIG. 34B also shows that a multiplicity of the passageways 37 are positioned in and adjacent to the projected machine side weft knuckle areas A( ⁇ W t2 and adjacent the knuckles 105b2 formed in the machine-facing side 52 of the reinforcing structure 33 by the weft yarns 54.
- This is believed to be due at least in part to the fact that the machine side weft knuckles 105b2 comprise the portion of the reinforcing structure 33 which is in direct contact with the working surface of the forming unit during the casting process, and as a result, no resinous material will lie between these knuckles and the working surface. This causes these knuckles to be exposed in the finished belt 10.
- FIG. 34C shows that the heights of the passageways 37 extend inward from the plane defined by the machine-facing side of the reinforcing structure Pt ⁇ j to the bottom sides of the structural components 40a which comprise the opaque first portion Poi-
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP91913639A EP0536320B1 (en) | 1990-06-29 | 1991-06-14 | Papermaking belt and method of making the same using differential light transmission techniques |
DE69103752T DE69103752T2 (en) | 1990-06-29 | 1991-06-14 | Ribbon for paper manufacture and process for its manufacture using techniques based on different light transmission. |
KR1019920703390A KR100218034B1 (en) | 1990-06-29 | 1991-06-14 | Papermaking belt and method of making the same using differential light transmission techniques |
BR919106606A BR9106606A (en) | 1990-06-29 | 1991-06-14 | PAPER MANUFACTURING BELT, PROCESS TO PRODUCE A PAPER MANUFACTURING BELT, TEXTURED REAR SIDE PAPER BELT, PROCESS TO PRODUCE AN ABSORBING, SOFT, RESISTANT PAPER TEXTURE AND BRAIDED PAPER MAKING TISSUE |
AU82340/91A AU663467B2 (en) | 1990-06-29 | 1991-06-14 | Papermaking belt and method of making the same using differential light transmission techniques |
FI925890A FI97552C (en) | 1990-06-29 | 1992-12-28 | Paper-making strap and method for making it using differential light transmission technology |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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US54663390A | 1990-06-29 | 1990-06-29 | |
US546,633 | 1990-06-29 |
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PCT/US1991/004256 WO1992000415A1 (en) | 1990-06-29 | 1991-06-14 | Papermaking belt and method of making the same using differential light transmission techniques |
Country Status (17)
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US (5) | US5334289A (en) |
EP (1) | EP0536320B1 (en) |
JP (1) | JP3145115B2 (en) |
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CN (1) | CN1026510C (en) |
AT (1) | ATE110808T1 (en) |
AU (2) | AU663467B2 (en) |
BR (1) | BR9106606A (en) |
CA (3) | CA2083600C (en) |
DE (1) | DE69103752T2 (en) |
DK (1) | DK0536320T3 (en) |
ES (1) | ES2061261T3 (en) |
FI (1) | FI97552C (en) |
IE (1) | IE64594B1 (en) |
MX (1) | MX9100035A (en) |
PT (1) | PT98152B (en) |
WO (1) | WO1992000415A1 (en) |
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