EP0603117B1 - Procédé pour la fabrication des papiers de sécurité imprimés et colorés - Google Patents

Procédé pour la fabrication des papiers de sécurité imprimés et colorés Download PDF

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Publication number
EP0603117B1
EP0603117B1 EP93810796A EP93810796A EP0603117B1 EP 0603117 B1 EP0603117 B1 EP 0603117B1 EP 93810796 A EP93810796 A EP 93810796A EP 93810796 A EP93810796 A EP 93810796A EP 0603117 B1 EP0603117 B1 EP 0603117B1
Authority
EP
European Patent Office
Prior art keywords
colour
color
printing ink
formulation
printed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP93810796A
Other languages
German (de)
English (en)
Other versions
EP0603117A1 (fr
Inventor
Hanspeter Hauser
Werner Helmut Dr. Gerber
Abul Dr. Iqbal
Pierre Maurer
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Novartis AG
Original Assignee
Ciba Geigy AG
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 Ciba Geigy AG filed Critical Ciba Geigy AG
Publication of EP0603117A1 publication Critical patent/EP0603117A1/fr
Application granted granted Critical
Publication of EP0603117B1 publication Critical patent/EP0603117B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • 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
    • B41M3/144—Security printing using fluorescent, luminescent or iridescent effects
    • 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
    • G03C5/08—Photoprinting; Processes and means for preventing photoprinting

Definitions

  • the invention relates to a method for producing counterfeit-proof, i.e. Color printed products, in particular securities, which cannot be reproduced true to color by means of color copying machines.
  • Colored printed products that fluoresce when irradiated with UV light are known, for example, from AU-A-518,156. It is also known from GB-A-1,407,065 to print sensitive documents, including securities or banknotes, with a pair of metameric printing inks at least in regions, in such a way that the metameric colors are printed side by side on the document. These colors do not differ visually in daylight, but when illuminated with UV light the two colors appear different. It is also known from EP-A-0,428,828 to print a ticket with a fluorescent and a non-fluorescent color which practically does not differ visually in daylight. When trying to copy such tickets, the fluorescent color is falsified.
  • the documents can only be recognized as forgeries with the aid of technical aids (UV light) and can therefore only be assigned to recognition class 2 or 3, in which technical aids (eg UV light) are required in any case to distinguish a counterfeit or copy from the original.
  • technical aids eg UV light
  • the invention is now intended to show a possibility such as this misuse of color copiers, if not prevented, can be rendered useless.
  • this object is achieved in that the colored printed products, the falsification of which is to be prevented or made useless by means of copying machines, are printed with printing inks which cannot be easily reproduced with the conventional color copying machines.
  • the color copies made on the color copiers then differ in color, i.e. in terms of nuance, saturation and brightness clearly from the originals and are therefore easily recognizable as fakes.
  • the procedure is such that at least one characteristic area of the printed product is printed with a printing ink that is formulated from a single colorant or from a mixture of two or more colorants in order to achieve a desired default color so that between the visual color impression of the with this printing ink printed characteristic area of the original printed product and the visual color impression of the corresponding area of a color copy of the original printed product by means of a color copying machine, there is a visually clearly recognizable difference.
  • colorants are used for the formulation of the printing ink which have significantly different optical data than the optical data (absorption / scattering as a function of the wavelength) of the colorants (toners) usually used in color copiers.
  • Particularly suitable colorants are those of the applicant under the names "IRGAZIN Yellow 2RLT”, “IRGAZIN Yellow 3RLTN”, “CROMOPHTAL Orange 2G”, “CROMOPHTAL Brown 5R”, “CROMOPHTAL Orange GP”, “CROMOPHTAL Scarlet RN”, “CROMOPHTAL Red” G “,” CROMOPHTAL DPP Red BP “,” CROMOPHTAL Violet B “,” IRGALITH Green GLN “and” IRGALITH Green 6G ".
  • the formulation of the printing ink required to achieve a desired preset color is carried out in such a way that a reference or re-creation of the desired preset color is first created by either using the preset color in a Color copying machine is usually used or similar to these colorants or a color copy of the specified color is created by means of the color copying machine.
  • the printing ink is then formulated with the proviso that, based on two selected types of lighting, there is as large a metamerism as possible between the prescribed printing ink or the area of the original printed product printed with this printing ink on the one hand and the reference or re-adjustment of the default color on the other results in such a way that between the visual color impression of the characteristic area of the original printed product printed with this printing ink and the visual color impression of the corresponding area there is a visually clearly recognizable difference from the original printed product by means of a color copying device.
  • printing ink is understood to mean the physical color (liquid or pasty) which is applied to the substrate, usually special banknote paper, by means of a suitable printing process (gravure printing, offset printing, etc.).
  • Colorants are understood to mean the constituents of a printing ink which produce the color effect thereof; these are usually color pigments or soot (black colorants).
  • Color is the visual and colorimetrically detectable color impression that a printing ink or a substrate printed with it produces.
  • Formulation is understood to mean the composition of a printing ink according to the type and amount of colorants and the determination of the composition from a predetermined range of colorants which is necessary or suitable for the achievement (adjustment) of a desired default color (a desired color impression).
  • the colorants usually used in a color copier are for better differentiation hereinafter referred to as toner.
  • Color copiers usually work with three colored toners (yellow, cyan and magenta) and usually also with a black toner.
  • Known computer-assisted formulation systems are available for formulation, which have stored the optical data of the gamma of colorants used and which e.g. Using the spectrophotometer to simulate or specify the spectrum of the specified color using more or less sophisticated algorithms by combining the different colorants from the stored gamma with predeterminable accuracy.
  • the result of the formulation is the composition of the printing ink according to the type and proportion of the individual colorants.
  • a known formulation program of this type is the software issued by the applicant under the name "CGREC" and coordinated with the pigment program of the applicant, which software can optionally run on any personal computer in connection with a spectrophotometer.
  • formulation systems generally supply several formulations with possibly different colorants, all of which match the specified color within the specified tolerance. The selection of the most suitable formulation is then made on the basis of further considerations which are not relevant here.
  • Some formulation systems also allow the determination of the metamerism between the specified color and the formulated colorant mixture, that is to say the adjustment of the specified color.
  • Metamerism with regard to two defined types of lighting is qualitatively known to mean the color difference between two physical colors (e.g. printing inks or printed surfaces or the like) for one of the defined types of lighting if the same two physical colors have no color difference for the other of the two defined types of lighting.
  • the metamerism can be clearly determined quantitatively using known calculation methods (e.g. according to DIN 6172) from the spectra of the two colors for the two defined types of lighting.
  • Spectrophotometers can be used to determine the spectra; the calculation of the metamerism is advantageously carried out according to the known formulas using the calculation programs available for this purpose.
  • the most common types of lighting are daylight (D65) and incandescent light (A) in accordance with the standards of the CIE.
  • Colored securities for example banknotes and the like, usually have some characteristic colored areas in their motif or are characteristic as a whole in narrow spaces Boundaries of constant colors printed.
  • these characteristic color areas may not be reproduced true to the original with the color copying machine, ie they may be reproduced true to color.
  • these areas of the security are now printed with special printing inks which cannot be reproduced or at least only very poorly by means of the usual color copying machines, so that the copies produced in this way can therefore be colored, ie with regard to shade / hue, saturation and Clearly differentiate brightness from the original printed product and can be identified as counterfeit.
  • these special printing inks starting from the respective default colors, are mixed (formulated) from different colorants (pigments) in such a way that the colorants involved in the respective formulation are as far as possible with regard to their spectral properties (absorption and scattering as a function of the wavelength) far from the colorants (toners) commonly used in color copiers.
  • the reference R mentioned can be produced most simply by copying the preset color V, which is present as a physical pattern, by means of the color copying machine.
  • the color copy produced in this way is then directly the reference R, from the spectrum of which the metamerism or the metamerism index can then be determined together with the (calculated) spectrum of the respective printing ink formulation in the manner already known per se.
  • the reference can also be determined by formulating (adjusting) the specified color using the toners used in the color copying machine using a known formulation system which contains the spectral data of the toners stored.
  • the spectrum of the toner formulation determined in this way can either be taken directly from the formulation system or determined by measuring a color sample produced with this toner formulation.
  • substitute colorants which are as close as possible to them, in particular those from the same range as that from which the colorants originate for the formulation of the printing inks, can be used instead of the toners. In this case, too, the greatest color deviation occurs when copying if the metamerism mentioned is the greatest between the respective ink formulation and the reference.
  • the printing inks are formulated with the purest possible colorants (pigments) that are as far as possible from the toners in terms of their optical data.
  • fluorescence effect pigments such as "IRGAZIN Fluorescent Yellow 8501B"
  • the effect achieved can be further enhanced, particularly in the yellow-red area and in the yellow-green area.
  • the blunting black component
  • the black component is formulated using an anisotropic colorant such as the pigment "GRAPHITAN 7700" mentioned.
  • the metamerism is usually determined for the CIE lighting types D65 (daylight) and A (incandescent light). Of course, other types of lighting that may be more suitable for special cases can also be used.
  • the formulation and determination of the metamerism is preferably carried out using a suitably programmed computer.
  • a green is selected as the desired default color V.
  • the percentages in brackets behind the respective pigments mean that the pigment is not in pure form, but rather that the percentage (weight percent) of a nitrocellulose clearcoat added in brackets has been added to the pure pigment.
  • the nitrocellulose clearcoat that is added to the pure pigments is the same nitrocellulose clearcoat that is used as a component for formulation P i .
  • the nitrocellulose clear coat can be composed as follows: 8% nitrocellulose A 250 (18% dibutyl phthalate), Union Carbide 1% Ehtocel 7cp, DOW 6% synthetic resin AFS, Hommes 20% ethoxypropanol 20% ethyl acetate 45% ethanol
  • the color coordinates L, a, b of the formulations P i in the L, a, b color space are: Formulation P 1 : 83.8 (L coordinate), -41.9 (a coordinate), 30.8 (b coordinate) Formulation P 2 : 82.6 (L coordinate), -44.5 (a coordinate), 32.7 (b coordinate) Formulation P 3 : 81.4 (L coordinate), -40.9 (a coordinate), 32.6 (b coordinate) Formulation P 4 : 80.2 (L coordinate), -40.9 (a coordinate), 32.9 (b coordinate)
  • the reference R of the above specified color green with the L, a, b color coordinates 76.4 (L coordinate), -37.5 (a coordinate), 33.1 (b coordinate), the template on which the Color is printed, copied using the color copier (eg CANON CL 200).
  • the reference R then has the L, a, b color coordinates 73.6 (L coordinate), -31.5 (a coordinate), 25.3 (b coordinate).

Landscapes

  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Printing Methods (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Credit Cards Or The Like (AREA)

Claims (3)

  1. Procédé de fabrication de produits imprimés en couleur, en particulier de titres de valeur, présentant une sécurité à l'égard d'une falsification, c'est-à-dire non reproductibles, avec fidélité des couleurs, au moyen de photocopieuses couleur, dans le cas duquel on imprime au moins une zone caractéristique du produit imprimé avec une encre dont, pour obtenir une couleur prescrite désirée (V), la formule est établie à partir d'un unique colorant ou à partir d'un mélange de deux ou plusieurs colorants, caractérisé par le fait que l'on établit tout d'abord une référence (R) ou reproduction de la couleur prescrite désirée (V), en ce sens que l'on reproduit la couleur prescrite (V) au moyen des colorants (Ti) habituellement employés dans une photocopieuse couleur ou de colorants semblables à ceux-ci ou bien que l'on fait une photocopie couleur de la couleur prescrite (V) au moyen de la photocopieuse couleur, la formulation, nécessaire pour obtenir la couleur prescrite désirée, de l'encre se faisant avec l'intention d'obtenir, rapporté à deux modes d'éclairement choisis, une métamérie (M) la plus grande possible entre l'encre ainsi formulée (Pi) ou la zone, imprimée avec cette encre, du produit imprimé original (O), d'une part, et la référence (R) ou reproduction de la couleur prescrite (V) d'autre part, de façon qu'une différence nettement visible à l'oeil apparaisse entre l'impression donnée à l'oeil par la couleur de la zone caractéristique, imprimée avec cette encre, du produit imprimé original (O) et l'impression donnée à l'oeil par la couleur de la zone correspondante d'une photocopie couleur (C) obtenue, à partir du produit imprimé original, au moyen d'une photocopieuse couleur.
  2. Procédé selon la revendication 1, caractérisé par le fait que pour la formulation de l'encre, on emploie, ou on emploie également, un colorant noir non amorphe ou anisotrope.
  3. Procédé selon l'une des revendications 1 ou 2, caractérisé par le fait que pour la formulation de l'encre, on emploie, ou on emploie également, un colorant à effet, en particulier un colorant à effet fluorescent.
EP93810796A 1992-12-03 1993-11-16 Procédé pour la fabrication des papiers de sécurité imprimés et colorés Expired - Lifetime EP0603117B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
EP92810951 1992-12-03
EP92810951 1992-12-30

Publications (2)

Publication Number Publication Date
EP0603117A1 EP0603117A1 (fr) 1994-06-22
EP0603117B1 true EP0603117B1 (fr) 1996-12-27

Family

ID=8212043

Family Applications (1)

Application Number Title Priority Date Filing Date
EP93810796A Expired - Lifetime EP0603117B1 (fr) 1992-12-03 1993-11-16 Procédé pour la fabrication des papiers de sécurité imprimés et colorés

Country Status (6)

Country Link
US (1) US6013307A (fr)
EP (1) EP0603117B1 (fr)
JP (1) JPH06210944A (fr)
KR (1) KR940013870A (fr)
CA (1) CA2110425A1 (fr)
DE (1) DE59304894D1 (fr)

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US5667317A (en) * 1995-08-29 1997-09-16 Ncr Corporation Fluorescent security system for printed transaction records
KR100303131B1 (ko) * 1999-08-17 2001-09-24 한용택 인장의 위조방지방법 및 위조방지처리된 서류
US6712894B2 (en) 2001-05-09 2004-03-30 Cabot Corporation Method of producing secure images using inks comprising modified pigment particles
US7536553B2 (en) * 2001-05-10 2009-05-19 Pitney Bowes Inc. Method and system for validating a security marking
DE10129938B4 (de) * 2001-06-20 2005-05-25 Ovd Kinegram Ag Als Echtheitsmerkmal auf einem Dokument angeordnetes optisch variables Flächenmuster
US20030221806A1 (en) * 2002-05-30 2003-12-04 Naumann Larry J. Dyed or tinted paper and method of making same
GB0228303D0 (en) 2002-12-04 2003-01-08 Rue De Int Ltd Security device and method
WO2004102195A1 (fr) * 2003-05-14 2004-11-25 Index Pharmaceuticals Ab Methode d'identification d'agents de regulation de tff2 et agents identifies au moyen de ladite methode
US20050166781A1 (en) * 2004-02-04 2005-08-04 Fritz Terry-Lee M. Uses of metamerism in printing
AT500777B1 (de) * 2004-09-14 2008-09-15 Oesterreichische Banknoten U S Sicherheitsmerkmal
AU2006204813A1 (en) * 2005-01-14 2006-07-20 Cabot Corporation Security features, their use, and processes for making them
US20080087189A1 (en) * 2005-10-03 2008-04-17 Sun Chemical Corporation Security pigments and the process of making thereof
WO2007041579A2 (fr) * 2005-10-03 2007-04-12 Sun Chemical Corporation Pigments de securite et procede de fabrication
US8277908B2 (en) * 2006-05-11 2012-10-02 Xerox Corporation Substrate fluorescence mask for embedding information in printed documents
US8283004B2 (en) * 2006-05-11 2012-10-09 Xerox Corporation Substrate fluorescence pattern mask for embedding information in printed documents
US8790459B2 (en) * 2006-05-31 2014-07-29 Cabot Corporation Colored reflective features and inks and processes for making them
US9533523B2 (en) 2006-05-31 2017-01-03 Sicpa Holding Sa Reflective features with co-planar elements and processes for making them
US20070279718A1 (en) * 2006-05-31 2007-12-06 Cabot Corporation Reflective features with co-planar elements and processes for making them
US20070281177A1 (en) * 2006-05-31 2007-12-06 Cabot Corporation Colored Reflective Features And Inks And Processes For Making Them
US8070186B2 (en) 2006-05-31 2011-12-06 Cabot Corporation Printable reflective features formed from multiple inks and processes for making them
US20070281136A1 (en) * 2006-05-31 2007-12-06 Cabot Corporation Ink jet printed reflective features and processes and inks for making them
WO2008110563A1 (fr) * 2007-03-15 2008-09-18 Akzo Nobel Coatings International B.V. Peinture à couleur non constante
US8821996B2 (en) * 2007-05-29 2014-09-02 Xerox Corporation Substrate fluorescent non-overlapping dot patterns for embedding information in printed documents
US8460781B2 (en) * 2007-06-05 2013-06-11 Xerox Corporation Infrared encoding of security elements using standard xerographic materials
US8455087B2 (en) * 2007-06-05 2013-06-04 Xerox Corporation Infrared encoding of security elements using standard xerographic materials with distraction patterns
US8009329B2 (en) * 2007-11-09 2011-08-30 Xerox Corporation Fluorescence-based correlation mark for enhanced security in printed documents
ITMO20090201A1 (it) * 2009-08-03 2011-02-04 Cavallini Eugenio Proprieta Al 70 Metodo anticontraffazione applicato a prodotti cartacei e prodotto cartaceo inglobante un codice di autenticazione anticontraffazione
RU2636088C1 (ru) * 2016-07-01 2017-11-20 Дмитрий Николаевич Задорин Контрастный многослойный пигмент и способ его получения
RU2631297C1 (ru) * 2016-08-26 2017-09-20 Дмитрий Николаевич Задорин Прозрачный субстрат, содержащий метамерный пигмент или метамерное сочетание пигментов, и многослойный пигмент на его основе
CN111304934A (zh) * 2020-04-03 2020-06-19 晋江市祺烽线带有限公司 一种涤纶纱的染色方法
CN113580806B (zh) * 2021-07-21 2022-08-19 中钞印制技术研究院有限公司 防伪元件和安全文件

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US4066280A (en) * 1976-06-08 1978-01-03 American Bank Note Company Documents of value printed to prevent counterfeiting
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ATE142360T1 (de) * 1988-04-05 1996-09-15 Zeneca Ltd Sicherheitskodierung
DE3938603A1 (de) * 1989-11-21 1991-05-23 Jung Bayropa Gmbh Verfahren zum erkennen von kopien

Also Published As

Publication number Publication date
DE59304894D1 (de) 1997-02-06
EP0603117A1 (fr) 1994-06-22
KR940013870A (ko) 1994-07-16
CA2110425A1 (fr) 1994-06-04
US6013307A (en) 2000-01-11
JPH06210944A (ja) 1994-08-02

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