WO1996017729A1 - Imprint sheets of a self-copy set - Google Patents
Imprint sheets of a self-copy set Download PDFInfo
- Publication number
- WO1996017729A1 WO1996017729A1 PCT/EP1995/004685 EP9504685W WO9617729A1 WO 1996017729 A1 WO1996017729 A1 WO 1996017729A1 EP 9504685 W EP9504685 W EP 9504685W WO 9617729 A1 WO9617729 A1 WO 9617729A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- color developer
- recording
- sheet
- color
- sheet according
- Prior art date
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/124—Duplicating or marking methods; Sheet materials for use therein using pressure to make a masked colour visible, e.g. to make a coloured support visible, to create an opaque or transparent pattern, or to form colour by uniting colour-forming components
- B41M5/132—Chemical colour-forming components; Additives or binders therefor
- B41M5/155—Colour-developing components, e.g. acidic compounds; Additives or binders therefor; Layers containing such colour-developing components, additives or binders
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M3/00—Printing processes to produce particular kinds of printed work, e.g. patterns
- B41M3/14—Security printing
- B41M3/142—Security printing using chemical colour-formers or chemical reactions, e.g. leuco-dye/acid, photochromes
Definitions
- the invention relates to a recording sheet of a carbon copy set with a layer applied to one of its sides, in which there is a color developer which is used to react with colorless dye precursors.
- Recording sheets of the type specified at the outset are known and are used in particular in pressure-sensitive copy sets.
- a recording sheet provided with a color developer layer on its top forms the end sheet in a pressure-sensitive copy set.
- Such a bow is referred to below as a CF bow.
- the color developer layer of the CF sheet is in contact with the underside of a further sheet which has a layer on the rear side which contains the color formers which are intended to react with the color developer of the CF sheet.
- Such bows are called CB bows.
- CB bows To avoid early contact with the color developers it is established that the dye precursors are dissolved in a suitable solvent and sealed in microcapsules.
- CFB sheets can be used as interleaves in pressure-sensitive carbon copy sets, each of which has a CF coating on the top and a CB coating on the back.
- Transfer sheets in which the dye precursors are not in encapsulated form are also known from the prior art.
- DE-A-22 19 527 the use of unencapsulated dye precursors is known, with crystal violet lactone on a neutral pigment, e.g. As calcium carbonate, is adsorbed and is applied to one side of a sheet, the other side of which has a microcapsule coating with a color former solution contained therein.
- a neutral pigment e.g. As calcium carbonate
- the common arrangement of color former and color developer or color acceptor on one side of a sheet is not disclosed.
- DE-A-31 02 472 discloses a pressure-sensitive recording sheet in which a color precursor together with neutral clay, calcium carbonate or titanium dioxide is contained in the form of an encapsulated form in the layer of the recording material.
- a typeface is created by printing a layer on the underside of another sheet, which contains a color acceptor in addition to wax, is transferred to the base sheet containing the color precursor.
- Sheet-like recording materials in which the color formers are arranged together with neutral pigment in an encapsulated form in a layer are known from DE-A-29 52 445.
- DE-A-41 03 966 describes a solid color former which is enclosed in a first shell made of water-soluble, non-ionic polymer and a second shell made of a crosslinked polymer.
- aqueous dispersion of the color former preparation is mixed with a likewise aqueous developer dispersion and applied to a paper.
- An unencapsulated color former which together with a mixture of different ester compounds, waxes and plastics as well as fillers such.
- B. CaC0 3 , BASO4 or Ti ⁇ 2 is provided to form a CB layer, is from EP-A- 0 059 679 known.
- a security document is known e.g. B. known for use as a credit card or ticket.
- This document also describes the problem that a ticket purchased for a nearby travel destination is forged by specifying a travel destination further away.
- the substrate surface is provided with a composition of the type normally used in the production of pressure-sensitive recording papers.
- the pressure-sensitive recording surface formed lies in the same plane (coplanar) as the rest of the surface of the substrate and is covered with a transparent protective layer. If the protective layer is removed with the aim of falsifying data, there is easily detectable damage to the substrate and, in addition, a step or shoulder at the point where the original transparent protective layer is replaced.
- EP-A-0 237 226 discloses a pressure-sensitive recording material in which a dye precursor in solid form on a substrate and a color developer for the dye precursor and microcapsules containing a solvent on a further substrate which is intended for contact with the first substrate for the dye precursor are arranged. None of the documents discussed above disclose the presence of a solid and unencapsulated dye precursor together with a reactive color developer in a single layer of pressure sensitive recording material.
- Copy sets are also known from the prior art which are composed of the known pressure-sensitive CB sheets, CF sheets and one or more CFB sheets.
- pressure-sensitive carbon copy sets are used as tickets or tickets in public transport, there is the disadvantage of insufficient counterfeit security. It has been shown that the typefaces produced on the recording layer can be removed by treatment with suitable solvents and can be replaced by false information.
- the present invention has for its object to provide a recording sheet for use in a pressure-sensitive copy set, in which it is easily possible to recognize the removal of data by using organic solvents.
- the invention provides a recording sheet Copy set, which has a recording layer applied to one of its sides, in which there is a color developer which is used to react with colorless dye precursors, the combination of the following features:
- the recording layer contains one or more oil-soluble dye precursors in solid form
- the dye precursor (s) are freely accessible and are not isolated from the color developer;
- the proportion of dye precursors, based on color developer, is 0.1 to 1 wt.%.
- recording layer used in patent claims and description is to be understood not only as a recording sheet provided with a CF layer, but also as a so-called SC (soap-containing) sheet, in which color developers and encapsulated dye precursor solutions are present in one layer or in several superimposed layers on one side of a sheet.
- organic color developer generally encompasses the known acidic resins such as phenolic resins of the novolac type, salicylic acid derivatives and their metal salt compounds.
- customary color formers in particular fluoranes, are suitable for the purposes of the present invention.
- ⁇ soluble is to be understood that the dye precursors are soluble in the organic solvents known as core solvents or capsule oil, but also in solvents such as acetone, ethanol and toluene.
- the dye precursor contained in the recording layer is at least partially dissolved and, in cooperation with the color developer, depending on the type of dye precursor used, a z. B. blue or red coloring, which clearly indicates the removal of the original data when checked.
- the relatively small amount of dye precursor which is added in relation to the color developer present at the same time, quasi in the "subcritical range", ensures that there is no premature discoloration of the recording layer.
- a print caused, for example, by a pen does not yet lead to the creation of a typeface on the recording layer of the recording sheet according to the invention, because between that in the solid Form present dye precursor and the color developer no reaction takes place.
- the proportion of the dye precursor, based on the color developer present in the recording layer is below the minimum amount of 0.1% by weight provided by the invention, treatment with solvent does not lead to a sufficiently deep coloring, so that the detection of a forgery is made more difficult.
- the amount of dye precursor used, based on acidic clay as color developer is as is usually the case for producing a clearly visible typeface is used, approx. 5% by weight, while in the case of organic acceptors approx. 25 to 30% by weight are required.
- the color developer layer is in a basis weight of 4 to 8 g / m 2 , 45 to 65% by weight of color developer being contained in the recording layer.
- organic Color developers prefer an applied basis weight of 4 to 6 g / m 2 .
- the recording sheets according to the invention and their use in carbonless records are not restricted to specific uses for the carbonless records.
- the recording sheets according to the invention can be used as an insert sheet in printed duplicate sets which are used as waybills.
- the recording sheets according to the invention are very particularly preferably used as an intermediate sheet in sets of flight or ticket forms, in particular if these are filled in by hand. Because these tickets are often only issued during the journey and careful handling of the form sets cannot always be guaranteed, a CB and CF sheet, preferably combined with a CFB sheet, are preferably used for such form sets , since it has been shown that the use of SC-bows can lead to unwanted premature discoloration for this purpose.
- a CF sheet according to the invention is produced by one on one side of a wood-free coating base paper with a basis weight of 50 g / m 2, which is conventional per se for this purpose
- Recording layer is applied with a mass per unit area of 7 g / m 2 , in which an acid clay is present as the color developer and, based on the acid clay, 0.8% by weight of crystal violet lactone is added.
- the proportion of the acidic clay in the recording layer is 3.9 g / m 2
- the recording layer contains the usual coating aids and a binder made from butadiene-styrene latex, which, based on the acidic clay, are present in an amount of 30% as further constituents .% is present.
- the CF sheet After drying, the CF sheet is satinized and combined with a commercially available CB sheet to form a set of forms that can be used as a ticket after appropriate printing. If a handwritten entry is made on the CB sheet and an attempt is made to remove the copy made on the CF sheet by careful treatment with ethanol with the aim of replacing the original entry with another one, one clearly forms on the CF sheet recognizable blue coloration, which is caused by the solution of the crystal violet lactone caused by ethanol. The resulting blue color indicates an attempt to fake it.
Abstract
Description
Claims
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU41766/96A AU690783B2 (en) | 1994-12-08 | 1995-11-29 | Imprint sheets of a self-copy set |
SI9530225T SI0796173T1 (en) | 1994-12-08 | 1995-11-29 | Imprint sheets of a self-copy set |
DE59504843T DE59504843D1 (en) | 1994-12-08 | 1995-11-29 | DOCUMENTARY OF A COPY RATE |
CZ971739A CZ173997A3 (en) | 1994-12-08 | 1995-11-29 | Record sheet of tracing set of papers |
EP95940255A EP0796173B1 (en) | 1994-12-08 | 1995-11-29 | Imprint sheets of a self-copy set |
PL95320633A PL320633A1 (en) | 1994-12-08 | 1995-11-29 | Copied characters receiving sheet in a set of self-copying sheets |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DEP4443660.2 | 1994-12-08 | ||
DE4443660A DE4443660C1 (en) | 1994-12-08 | 1994-12-08 | Copy sheet of a carbon copy |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996017729A1 true WO1996017729A1 (en) | 1996-06-13 |
Family
ID=6535238
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/EP1995/004685 WO1996017729A1 (en) | 1994-12-08 | 1995-11-29 | Imprint sheets of a self-copy set |
Country Status (9)
Country | Link |
---|---|
EP (1) | EP0796173B1 (en) |
AU (1) | AU690783B2 (en) |
CZ (1) | CZ173997A3 (en) |
DE (2) | DE4443660C1 (en) |
ES (1) | ES2128108T3 (en) |
IL (1) | IL116181A0 (en) |
PL (1) | PL320633A1 (en) |
WO (1) | WO1996017729A1 (en) |
ZA (1) | ZA9510065B (en) |
Families Citing this family (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CA2926436A1 (en) | 2013-10-07 | 2015-04-16 | Judith Murrah | Multimode image and spectral reader |
US10745825B2 (en) | 2014-03-18 | 2020-08-18 | Apdn (B.V.I.) Inc. | Encrypted optical markers for security applications |
CN106103121B (en) * | 2014-03-18 | 2019-12-06 | 亚普蒂恩(B.V.I.)公司 | Encrypted optical marker for security applications |
WO2018156352A1 (en) | 2017-02-21 | 2018-08-30 | Apdn (B.V.I) Inc. | Nucleic acid coated submicron particles for authentication |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2518871A1 (en) * | 1974-04-26 | 1975-11-13 | Portals Ltd | SECURITY DOCUMENTS |
DE2722427A1 (en) * | 1977-05-18 | 1978-11-30 | Juergen Dethloff | Cheques with forgery proof coding zones - are for visual and automatic reading using pressure sensitive capsules containing chemicals |
DE3038178C1 (en) * | 1980-10-09 | 1982-06-09 | GAO Gesellschaft für Automation und Organisation mbH, 8000 München | Security paper protected against erasing |
EP0156618A2 (en) * | 1984-03-20 | 1985-10-02 | John Tythe | Security documents |
-
1994
- 1994-12-08 DE DE4443660A patent/DE4443660C1/en not_active Expired - Fee Related
-
1995
- 1995-11-27 ZA ZA9510065A patent/ZA9510065B/en unknown
- 1995-11-28 IL IL11618195A patent/IL116181A0/en unknown
- 1995-11-29 PL PL95320633A patent/PL320633A1/en unknown
- 1995-11-29 CZ CZ971739A patent/CZ173997A3/en unknown
- 1995-11-29 AU AU41766/96A patent/AU690783B2/en not_active Ceased
- 1995-11-29 EP EP95940255A patent/EP0796173B1/en not_active Expired - Lifetime
- 1995-11-29 DE DE59504843T patent/DE59504843D1/en not_active Expired - Fee Related
- 1995-11-29 ES ES95940255T patent/ES2128108T3/en not_active Expired - Lifetime
- 1995-11-29 WO PCT/EP1995/004685 patent/WO1996017729A1/en not_active Application Discontinuation
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE2518871A1 (en) * | 1974-04-26 | 1975-11-13 | Portals Ltd | SECURITY DOCUMENTS |
DE2722427A1 (en) * | 1977-05-18 | 1978-11-30 | Juergen Dethloff | Cheques with forgery proof coding zones - are for visual and automatic reading using pressure sensitive capsules containing chemicals |
DE3038178C1 (en) * | 1980-10-09 | 1982-06-09 | GAO Gesellschaft für Automation und Organisation mbH, 8000 München | Security paper protected against erasing |
EP0156618A2 (en) * | 1984-03-20 | 1985-10-02 | John Tythe | Security documents |
Also Published As
Publication number | Publication date |
---|---|
DE4443660C1 (en) | 1995-10-26 |
EP0796173B1 (en) | 1999-01-13 |
ES2128108T3 (en) | 1999-05-01 |
AU690783B2 (en) | 1998-04-30 |
PL320633A1 (en) | 1997-10-13 |
IL116181A0 (en) | 1996-01-31 |
EP0796173A1 (en) | 1997-09-24 |
DE59504843D1 (en) | 1999-02-25 |
CZ173997A3 (en) | 1997-11-12 |
ZA9510065B (en) | 1996-06-29 |
AU4176696A (en) | 1996-06-26 |
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