WO2000073582A1 - Base paper as well as security paper - Google Patents

Base paper as well as security paper Download PDF

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Publication number
WO2000073582A1
WO2000073582A1 PCT/NL2000/000248 NL0000248W WO0073582A1 WO 2000073582 A1 WO2000073582 A1 WO 2000073582A1 NL 0000248 W NL0000248 W NL 0000248W WO 0073582 A1 WO0073582 A1 WO 0073582A1
Authority
WO
WIPO (PCT)
Prior art keywords
paper
glue
film
security
colorant
Prior art date
Application number
PCT/NL2000/000248
Other languages
German (de)
French (fr)
Inventor
Mark Dikken
Original Assignee
Security Transfer B.V.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Security Transfer B.V. filed Critical Security Transfer B.V.
Priority to AU41521/00A priority Critical patent/AU4152100A/en
Publication of WO2000073582A1 publication Critical patent/WO2000073582A1/en

Links

Classifications

    • 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
    • D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
    • D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
    • D21H21/30—Luminescent or fluorescent substances, e.g. for optical bleaching
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D21H19/828—Paper comprising more than one coating superposed two superposed coatings, the first applied being non-pigmented and the second applied being pigmented
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/84—Paper comprising more than one coating on both sides of the substrate

Definitions

  • the invention relates to a base paper comprising a layer of paper with a film of glue present on both sides thereof, to security paper and to the use of such security paper as printing paper for documents, such as documents for fi- nancial transactions, insurance policies or the like.
  • Insurance policies, documents for financial transactions, such as bank transfer forms, cheques and the like are usually manufactured by using standard paper, wherein a coating is applied to the layer of paper so as to improve the adhesion of ink when printing or writing thereon.
  • a coating is applied to the layer of paper so as to improve the adhesion of ink when printing or writing thereon.
  • a person who wishes to commit fraud to remove the data that are printed or written on the document by chemical or mechanical means and replace them with new data.
  • said processing usually takes place mechanically, whereby the documents are scanned and further processing takes place on the basis of the scanned data. It is important, therefore, to be able to detect possible fraud.
  • prior German patent application 198 32 900.8 discloses security paper wherein a col- orant , in particular an optical whitener, is incorporated in the layer of paper, which colorant generates fluorescence radiation upon being exposed to excitation radiation.
  • a special coating has been applied to the layer of paper, which provides a stronger bond to the characters and/or signs provided by printing or writing than that between the coating and the layer of paper, so that the coating will become detached from the layer of paper over a relatively large area upon manipulation.
  • the composition of the coating includes absorption pigments, which absorb the excitation radiation to a considerable extent. In the area where the coating has disappeared due to manipulation, fluorescence radiation can be generated through excitation with for example UV light, which makes it possible to recognise manipulated documents.
  • this prior art paper has the drawback that the presence of the coating leads to a colour difference between the two sides of the paper. This makes it easy for a person who wishes to commit fraud to establish that special paper has been used.
  • other security techniques are used with documents of this kind, wherein use is made of the fact that the paper does not contain an optical whitener and wherein the security elements light up upon being irradiated with a UV lamp. With said prior art paper, the use of such se- curity elements would not be possible on one side thereof.
  • the object of the invention is to provide a base paper of the kind referred to m the introduction, which can be used for manufacturing security paper which does not exhibit the aforesaid drawbacks .
  • the base paper according to the invention is characterized in that one of the films of glue includes a colorant, m particular an optical whitener, which generates fluorescence radiation under the influence of excitation radiation.
  • a base paper is obtained of which only one side includes a coating which contains a colorant, so that, once a coating of the above type has been applied, a security paper is obtained which exhibits the same colour one both sides.
  • additional security elements can be applied to both sides of the document.
  • the invention furthermore provides a security paper wherein a security coating is present on the film of glue containing a colorant.
  • a security coating is present on the film of glue containing a colorant.
  • the thickness of the security coating is selected so that the fluorescence radiation gener- ated by the colorant m spite of the presence of the coating remains below a specific threshold value.
  • the security paper is advantageously used as printing paper for various documents, m particular for documents for financial transactions, such as bank transfer forms, cheques and the like, securities, insurance policies or other documents that are subject to fraud.
  • documents for financial transactions such as bank transfer forms, cheques and the like, securities, insurance policies or other documents that are subject to fraud.
  • Figure 1 is a very diagrammatic view of an embodiment of the base paper according to the invention.
  • Figure 2 is a very diagrammatic view of an embodiment of the security paper according to the invention.
  • Figure 3 shows an embodiment of a method of manufacturing the base paper according to the invention.
  • Figure 1 schematically shows a base paper 1 comprising a layer of paper 2 with a film of glue 3 and 4, respectively, applied to both sides thereof.
  • Film of glue 3 is of a usual composition, for example including native maize starch in an amount of 0.74 - 2.78 g/m 2 and a mixture of a partial methyl ester of copolymers of styrene and maleic acid anhydride in an amount of 0.0045 - 0.0168 g/m 2 and 2.2-dibromic-3-nitrile- propionic amide as a biocide in an amount of 0.0002 - 0.0007 g/m 2 .
  • Film of glue 4 contains a colorant, which generates fluorescence radiation under the influence of an excitation radiation, such as UV light, for example.
  • an excitation radiation such as UV light
  • an optical whitener such as anionic stilbene sul- phonic acid derivate is used as the colorant.
  • FIG 2 shows a security paper which has been obtained by applying a coating 5 to the film of glue 4 of the base paper 1 of Figure 1, which coating is described in more detail in the aforesaid prior German patent application 198 32 900.8.
  • Said coating 5 comprises titanium dioxide, for example, as the substance which absorbs the excitation radiation for the optical whitener, as a result of which both sides of the security paper are optically dead in undamaged condition of coating 5.
  • One characteristic of coating 5 is the fact that it bonds more strongly to the ink applied by printing or writing than to the film of glue 4. When a person who wishes to commit fraud attempts to remove characters and/or signs placed on the security paper, this will lead to coating 5 being damaged as well, as a result of which film of glue 4 will be exposed. Fraud can now be demonstrated by means of radiation with UV light, since the partially exposed film of glue 4 will light up.
  • anionic stilbene sulphonic acid derivate in an amount of 0.007 - 0.025 g/m 2 is used as the optical whit- ener.
  • This relatively small amount of optical whitener is sufficient for generating properly detectable fluorescence radiation if coating 5 has been partially removed due to manipulation, whilst the light cannot shine through coating 5 and layer of paper 2, respectively.
  • the security paper which is shown in Figure 2 is particularly suitable for use as printing paper for documents for financial transactions, such as bank transfer forms, cheques and the like, securities, insurance policies or other documents that are subject to fraud.
  • Figure 3 schematically shows apparatus 6 which is known per se, by means of which the written base paper 1 can be manufactured.
  • Apparatus 6 includes two glue reservoirs 7, 7 A wherein glue reservoir 7 contains the aforesaid glue composition, whilst glue reservoir 7' contains the glue composition that includes an optical whitener.
  • glue reservoir 7 contains the aforesaid glue composition
  • glue reservoir 7' contains the glue composition that includes an optical whitener.
  • the glue solutions are transferred to application rollers 14, 14' by means of glue transfer rollers 13, 13 A which application rollers 14, 14' apply films of glue 3 and 4, respectively, to a paper web 11.
  • Excess glue solution 8, 8 ' is collected in glue receptacles 9, 9' and discharged via drains 10, 10 A Paper web 11 is led through the apparatus 6 via guide rollers 12 and 16.
  • Films of glue 3, 4 are dried by means of a drying apparatus 15.
  • Said apparatus 15 is configured as an infrared drier, for example.

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  • Paper (AREA)

Abstract

A base paper comprises a layer of paper with a film of glue present on both sides thereof. One of the films of glue includes a colorant, in particular an optical whitener, which generates fluorescence radiation under the influence of excitation radiation. A security coating is applied to the film of glue containing a colorant that is present on security paper which has been obtained by means of said base paper. The security paper is advantageously used as printing paper for various documents, in particular for documents for financial transactions, securities, insurance policies or other documents that are subject to fraud.

Description

Base paper as well as security paper
The invention relates to a base paper comprising a layer of paper with a film of glue present on both sides thereof, to security paper and to the use of such security paper as printing paper for documents, such as documents for fi- nancial transactions, insurance policies or the like.
Insurance policies, documents for financial transactions, such as bank transfer forms, cheques and the like are usually manufactured by using standard paper, wherein a coating is applied to the layer of paper so as to improve the adhesion of ink when printing or writing thereon. In practice it is easily possible for a person who wishes to commit fraud to remove the data that are printed or written on the document by chemical or mechanical means and replace them with new data. Because of the large number of documents that are to be processed, said processing usually takes place mechanically, whereby the documents are scanned and further processing takes place on the basis of the scanned data. It is important, therefore, to be able to detect possible fraud. To this end, prior German patent application 198 32 900.8 discloses security paper wherein a col- orant , in particular an optical whitener, is incorporated in the layer of paper, which colorant generates fluorescence radiation upon being exposed to excitation radiation. A special coating has been applied to the layer of paper, which provides a stronger bond to the characters and/or signs provided by printing or writing than that between the coating and the layer of paper, so that the coating will become detached from the layer of paper over a relatively large area upon manipulation. The composition of the coating includes absorption pigments, which absorb the excitation radiation to a considerable extent. In the area where the coating has disappeared due to manipulation, fluorescence radiation can be generated through excitation with for example UV light, which makes it possible to recognise manipulated documents.
Although a good protection against fraud is achieved in this manner, this prior art paper has the drawback that the presence of the coating leads to a colour difference between the two sides of the paper. This makes it easy for a person who wishes to commit fraud to establish that special paper has been used. Moreover, generally also other security techniques are used with documents of this kind, wherein use is made of the fact that the paper does not contain an optical whitener and wherein the security elements light up upon being irradiated with a UV lamp. With said prior art paper, the use of such se- curity elements would not be possible on one side thereof.
The object of the invention is to provide a base paper of the kind referred to m the introduction, which can be used for manufacturing security paper which does not exhibit the aforesaid drawbacks . In order to accomplish that objective, the base paper according to the invention is characterized in that one of the films of glue includes a colorant, m particular an optical whitener, which generates fluorescence radiation under the influence of excitation radiation. In this way a base paper is obtained of which only one side includes a coating which contains a colorant, so that, once a coating of the above type has been applied, a security paper is obtained which exhibits the same colour one both sides. Moreover, additional security elements can be applied to both sides of the document.
The invention furthermore provides a security paper wherein a security coating is present on the film of glue containing a colorant. Preferably, the thickness of the security coating is selected so that the fluorescence radiation gener- ated by the colorant m spite of the presence of the coating remains below a specific threshold value.
According to the invention the security paper is advantageously used as printing paper for various documents, m particular for documents for financial transactions, such as bank transfer forms, cheques and the like, securities, insurance policies or other documents that are subject to fraud. When the security paper according to the invention is used for this purpose, reliable detection of manipulations carried out on the document is possible.
The invention will be explained in more detail hereafter with reference to the drawings, which show exemplary embodiments of the base paper and the security paper according to the invention.
Figure 1 is a very diagrammatic view of an embodiment of the base paper according to the invention.
Figure 2 is a very diagrammatic view of an embodiment of the security paper according to the invention. Figure 3 shows an embodiment of a method of manufacturing the base paper according to the invention.
Figure 1 schematically shows a base paper 1 comprising a layer of paper 2 with a film of glue 3 and 4, respectively, applied to both sides thereof. Film of glue 3 is of a usual composition, for example including native maize starch in an amount of 0.74 - 2.78 g/m2 and a mixture of a partial methyl ester of copolymers of styrene and maleic acid anhydride in an amount of 0.0045 - 0.0168 g/m2 and 2.2-dibromic-3-nitrile- propionic amide as a biocide in an amount of 0.0002 - 0.0007 g/m2. Film of glue 4 contains a colorant, which generates fluorescence radiation under the influence of an excitation radiation, such as UV light, for example. For the rest the composition of film of glue 4 is identical to that of film of glue 3. Preferably, an optical whitener such as anionic stilbene sul- phonic acid derivate is used as the colorant. By using films of glue of this kind it is achieved that one side of the base paper, on which film of glue 3 is present, is optically dead, whilst the other side of the base paper 1, on which film of glue 4 is present, is optically active. Figure 2 shows a security paper which has been obtained by applying a coating 5 to the film of glue 4 of the base paper 1 of Figure 1, which coating is described in more detail in the aforesaid prior German patent application 198 32 900.8. Said coating 5 comprises titanium dioxide, for example, as the substance which absorbs the excitation radiation for the optical whitener, as a result of which both sides of the security paper are optically dead in undamaged condition of coating 5. One characteristic of coating 5 is the fact that it bonds more strongly to the ink applied by printing or writing than to the film of glue 4. When a person who wishes to commit fraud attempts to remove characters and/or signs placed on the security paper, this will lead to coating 5 being damaged as well, as a result of which film of glue 4 will be exposed. Fraud can now be demonstrated by means of radiation with UV light, since the partially exposed film of glue 4 will light up.
Preferably, anionic stilbene sulphonic acid derivate in an amount of 0.007 - 0.025 g/m2 is used as the optical whit- ener. This relatively small amount of optical whitener is sufficient for generating properly detectable fluorescence radiation if coating 5 has been partially removed due to manipulation, whilst the light cannot shine through coating 5 and layer of paper 2, respectively. The security paper which is shown in Figure 2 is particularly suitable for use as printing paper for documents for financial transactions, such as bank transfer forms, cheques and the like, securities, insurance policies or other documents that are subject to fraud. Figure 3 schematically shows apparatus 6 which is known per se, by means of which the written base paper 1 can be manufactured. Apparatus 6 includes two glue reservoirs 7, 7 A wherein glue reservoir 7 contains the aforesaid glue composition, whilst glue reservoir 7' contains the glue composition that includes an optical whitener. As is schematically indicated at 8 and 8 A the glue solutions are transferred to application rollers 14, 14' by means of glue transfer rollers 13, 13 A which application rollers 14, 14' apply films of glue 3 and 4, respectively, to a paper web 11. Excess glue solution 8, 8 ' is collected in glue receptacles 9, 9' and discharged via drains 10, 10 A Paper web 11 is led through the apparatus 6 via guide rollers 12 and 16. Films of glue 3, 4 are dried by means of a drying apparatus 15. Said apparatus 15 is configured as an infrared drier, for example. The invention is not restricted to the above- described embodiment, which can be varied in several ways without departing from the scope of the claims.

Claims

1. A base paper comprising a layer of paper with a film of glue present on both sides thereof, characterized in that one of the films of glue includes a colorant, in particular an optical whitener, which generates fluorescence radiation under the influence of excitation radiation.
2. A base paper according to claim 1, wherein one film of glue comprises an anionic stilbene sulphonic acid derivate as the optical whitener.
3. A base paper according to claim 2, wherein one film of glue comprises 0.007 - 0,025 g/m2 of anionic stilbene sulphonic acid derivate as the optical whitener.
4. A safety paper characterized by base paper according to any one of the preceding claims, wherein a security coating is present on the film of glue containing a colorant, which security coating contains a substance which absorbs the excitation radiation for the colorant.
5. A safety paper according to claim 4, wherein the thickness of the security coating is selected so that the fluorescence radiation generated by the colorant in spite of the presence of the security coating remains below a specific threshold value.
6. Use of safety paper according to claim 4 or 5 as printing paper for documents for financial transactions.
PCT/NL2000/000248 1999-05-27 2000-04-17 Base paper as well as security paper WO2000073582A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU41521/00A AU4152100A (en) 1999-05-27 2000-04-17 Base paper as well as security paper

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NL1012168 1999-05-27
NL1012168A NL1012168C2 (en) 1999-05-27 1999-05-27 Basic paper, as well as security paper.

Publications (1)

Publication Number Publication Date
WO2000073582A1 true WO2000073582A1 (en) 2000-12-07

Family

ID=19769269

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NL2000/000248 WO2000073582A1 (en) 1999-05-27 2000-04-17 Base paper as well as security paper

Country Status (3)

Country Link
AU (1) AU4152100A (en)
NL (1) NL1012168C2 (en)
WO (1) WO2000073582A1 (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1021956C2 (en) 2002-11-20 2004-05-24 Security Transfer B V Security paper, method for manufacturing a security paper, as well as method and device for detecting forgeries and / or counterfeiting of documents printed on security paper.

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1239818A (en) * 1967-08-03 1971-07-21 Geigy Ag J R Polysulfonated bis-s-triazinylamino-stilbene-2,2'-disulfonic acids
GB1254730A (en) * 1969-02-13 1971-11-24 Vyzk Ustav Organ Syntez A process for isolating reactive dyestuffs, or reactive optical brightening agents.
GB2299036A (en) * 1995-03-22 1996-09-25 Coated Papers Limited Coated Paper
GB2300596A (en) * 1995-05-10 1996-11-13 Portals Ltd Fluorescent security feature for cheques and banknotes

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1239818A (en) * 1967-08-03 1971-07-21 Geigy Ag J R Polysulfonated bis-s-triazinylamino-stilbene-2,2'-disulfonic acids
GB1254730A (en) * 1969-02-13 1971-11-24 Vyzk Ustav Organ Syntez A process for isolating reactive dyestuffs, or reactive optical brightening agents.
GB2299036A (en) * 1995-03-22 1996-09-25 Coated Papers Limited Coated Paper
GB2300596A (en) * 1995-05-10 1996-11-13 Portals Ltd Fluorescent security feature for cheques and banknotes

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
NATEROVA A ET AL: "EFFECTIVENESS OF FLUORESCENT BRIGHTENERS IN SURFACE SIZING", November 1987, ABSTRACT BULLETIN OF THE INSTITUTE OF PAPER CHEMISTRY,US,THE INSTITUTE OF PAPER CHEMISTRY-LIBRARY. APPLETON, VOL. 58, NR. 5, PAGE(S) 670, XP000031293 *

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL1021956C2 (en) 2002-11-20 2004-05-24 Security Transfer B V Security paper, method for manufacturing a security paper, as well as method and device for detecting forgeries and / or counterfeiting of documents printed on security paper.
WO2004045864A1 (en) 2002-11-20 2004-06-03 Security Transfer B.V. A security paper, a method for manufacturing security paper, as well as a method and a device for detecting falsfication and/or forgery of documents printed on said security paper
AU2003282622B2 (en) * 2002-11-20 2006-05-25 Security Transfer B.V. A security paper, a method for manufacturing security paper, as well as a method and a device for detecting falsification and/or forgery of documents printed on said security paper
AU2003282622B8 (en) * 2002-11-20 2006-07-06 Security Transfer B.V. A security paper, a method for manufacturing security paper, as well as a method and a device for detecting falsification and/or forgery of documents printed on said security paper

Also Published As

Publication number Publication date
NL1012168C2 (en) 2000-11-28
AU4152100A (en) 2000-12-18

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