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EP1384595B2 - Method for printing latent images - Google Patents

Method for printing latent images Download PDF

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Publication number
EP1384595B2
EP1384595B2 EP02102063A EP02102063A EP1384595B2 EP 1384595 B2 EP1384595 B2 EP 1384595B2 EP 02102063 A EP02102063 A EP 02102063A EP 02102063 A EP02102063 A EP 02102063A EP 1384595 B2 EP1384595 B2 EP 1384595B2
Authority
EP
European Patent Office
Prior art keywords
printing method
ink
printing
pattern
relief printing
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
EP02102063A
Other languages
German (de)
French (fr)
Other versions
EP1384595A1 (en
EP1384595B1 (en
Inventor
François Veldeman
Marc Salade
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.)
BANQUE NATIONALE DE BELGIQUE SA
Original Assignee
BANQUE NATIONALE DE BELGIQUE SA
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=29797290&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP1384595(B2) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by BANQUE NATIONALE DE BELGIQUE SA filed Critical BANQUE NATIONALE DE BELGIQUE SA
Priority to ES02102063T priority Critical patent/ES2218507T5/en
Priority to DE60200552T priority patent/DE60200552T3/en
Priority to EP02102063A priority patent/EP1384595B2/en
Priority to AT02102063T priority patent/ATE267711T1/en
Publication of EP1384595A1 publication Critical patent/EP1384595A1/en
Application granted granted Critical
Publication of EP1384595B1 publication Critical patent/EP1384595B1/en
Publication of EP1384595B2 publication Critical patent/EP1384595B2/en
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
    • B41M3/06—Veined printings; Fluorescent printings; Stereoscopic images; Imitated patterns, e.g. tissues, textiles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/10—Intaglio printing ; Gravure printing
    • 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
    • B41M3/148—Transitory images, i.e. images only visible from certain viewing angles

Definitions

  • the invention relates to methods for preventing the fraudulent reproduction of authentic documents, such as identity documents, banknotes, credit cards, etc.
  • the invention more particularly relates to affixing a "latent image" to the surface of such documents.
  • latent image means an image that can not be detected under "normal” observation conditions, that is to say when the document carrying such a latent image is observed under an angle perpendicular to its surface, while latent images only appear when the document is viewed from a defined angle.
  • this effect is obtained by printing regular reliefs, obtained in particular by a support structure in light relief (printing intaglio).
  • the latent image appears by a simple parallax effect when the reliefs are observed from a point located near their axis of extension (or perpendicular to it).
  • the object of the invention is that the image obtained is impossible to reproduce.
  • Another object of the invention is that the method is simple to implement.
  • the pattern comprises an area comprising a first network of lines extending along a preferred axis and at least a second zone comprising a second network of lines extending along an axis different from the preferred axis, to produce a latent image on the document.
  • operation b can be preceded by a preliminary printing.
  • the operation b may also be preceded by the apposition of a preliminary element such as a hologram.
  • the printing process is preferably selected from the following methods: screen printing, flexography, gravure printing.
  • the polymerization accelerator is activated by an energy supply by electromagnetic radiation, selected from the following: infrared, UV, microwave.
  • the Fig. 1 shows how the method of the invention makes it possible to produce a conventional latent image.
  • a first pattern A consisting of spaced lines 1 is formed in relief by the method of the invention on a substrate 2.
  • the lines in relief 1 extend along a preferred axis ⁇ .
  • a second pattern B, also consisting of spaced lines 3 is carried on the same substrate.
  • the raised lines 3 extend along another preferred axis ⁇ , clearly differentiated from ⁇ , or even perpendicular thereto.
  • These methods include, typically, screen printing, flexography and gravure printing.
  • the current practice in printing is that, in order to obtain the maximum optical effect of the pigments dispersed in the ink, the ink layer is as thin as possible, and therefore practically two-dimensional.
  • a thin layer also, in general, has the advantage of better adhesion to the support.
  • the relief patterns A and B can be made over a conventional printed pattern, or even on a piece of data authenticating the document, such as a holographic image, which, by its very presence (even if it is a coarse fake) may be enough for an observer who pays little heed to the authenticity of a document.
  • the method of the invention also allows identification and authentication of the document by the touch, the relief giving the document a distinct tactile sensation.

Landscapes

  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Textile Engineering (AREA)
  • Vascular Medicine (AREA)
  • Printing Methods (AREA)
  • Credit Cards Or The Like (AREA)
  • Photosensitive Polymer And Photoresist Processing (AREA)
  • Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)

Abstract

Printing a relief pattern on a printed document comprises printing at least one pattern of axial lines with a thick layer of ink containing a polymerizable material and a polymerization accelerator, and activating the polymerization accelerator by supplying energy.

Description

Domaine de 1 inventionField of invention

L'invention concerne les procédés destinés à empêcher la reproduction frauduleuse de documents authentiques, tels que les pièces d'identité, billets de banque, cartes de crédit, etc.The invention relates to methods for preventing the fraudulent reproduction of authentic documents, such as identity documents, banknotes, credit cards, etc.

L'invention concerne plus particulièrement l'apposition d'une "image latente" à la surface de tels documents.The invention more particularly relates to affixing a "latent image" to the surface of such documents.

Dans le secteur de l'imprimerie, on entend par "image latente" une image qui ne peut être détectée dans des conditions d'observation "normales", c'est-à-dire lorsque le document portant une telle image latente est observé sous un angle perpendiculaire à sa surface, alors que les images latentes n'apparaissent que lorsque le document est vu sous un angle défini.In the printing sector, the term "latent image" means an image that can not be detected under "normal" observation conditions, that is to say when the document carrying such a latent image is observed under an angle perpendicular to its surface, while latent images only appear when the document is viewed from a defined angle.

En imprimerie, cet effet est obtenu par l'impression de reliefs réguliers, obtenu notamment par une structure de support en léger relief (impression en taille douce). L'image latente apparaît par un simple effet de parallaxe lorsque les reliefs sont observés à partir d'un point situé près de leur axe d'extension (ou perpendiculairement à celui ci).In printing, this effect is obtained by printing regular reliefs, obtained in particular by a support structure in light relief (printing intaglio). The latent image appears by a simple parallax effect when the reliefs are observed from a point located near their axis of extension (or perpendicular to it).

Un des avantages de ces images latentes est qu'il est impossible de les reproduire à partir d'une copie simple (par photocopie ou par balayage électronique) d'un document authentique.One of the advantages of these latent images is that it is impossible to reproduce them from a simple copy (by photocopy or by electronic scanning) of an authentic document.

État de la techniqueState of the art

De nombreux procédés ont déjà vu le jour pour obtenir cet effet d'image latente. Comme signalé plus haut, on peut utiliser la taille douce (intaglio) pour marquer des reliefs sur le support du document.Many processes have already emerged to achieve this latent image effect. As mentioned above, you can use the intaglio to mark reliefs on the document support.

US 5,199,744 décrit un procédé où les reliefs sont réalisés par embossage. US 5,199,744 describes a method where the reliefs are made by embossing.

US 5,582,103 et US 4,033,059 décrivent un procédé où un support est marqué de reliefs dont soit les parties relevées, soit les parties abaissées sont ensuite imprimées. US5,582,103 and US 4,033,059 describe a method in which a support is marked with reliefs of which either the raised portions or the lowered portions are then printed.

Tous ces procédés du plus simple au plus complexe présentent un désavantage du point de vue de l'aménagement du relief requis pour obtenir l'effet d'image latente. La réalisation de ce relief implique en effet au minimum une opération avec matriçage, et de surcroît un alignement parfait de l'encrage avec les reliefs produits.All these processes from the simplest to the most complex present a disadvantage from the point of view of the development of the relief required to obtain the latent image effect. The realization of this relief implies in fact at least one operation with stamping, and moreover a perfect alignment of the inking with the reliefs produced.

Résumé de l'inventionSummary of the invention

On a cherché à réaliser un procédé permettant de réaliser les reliefs nécessaires à la production d'une image latente sur un support quelconque.It has been sought to provide a method for producing the reliefs necessary for the production of a latent image on any support.

Le but de l'invention est que l'image obtenue soit impossible à reproduire.The object of the invention is that the image obtained is impossible to reproduce.

Un autre but de l'invention est que le procédé soit simple à mettre en oeuvre.Another object of the invention is that the method is simple to implement.

L'objet de l'invention est un procédé d'impression en reliefs, entre autres pour l'impression d'images latentes, sur un document, qui comprend les opérations suivantes :

  1. a) sélectionner un substrat
  2. b) sélectionner une encre contenant un matériau polymérisable et un accélérateur de polymérisation
  3. c) sélectionner un procédé d'impression permettant le transfert d'encre en couche épaisse
  4. d) imprimer au moins un motif formé de lignes espacées s'étendant suivant au moins un axe préférentiel avec cette encre à l'aide de ce procédé
  5. e) activer l'accélérateur de polymérisation par un apport énergétique ad hoc pour faire polymériser l'encre en couche épaisse
The object of the invention is a relief printing method, among other things for the printing of latent images, on a document, which comprises the following operations:
  1. a) select a substrate
  2. b) selecting an ink containing a polymerizable material and a polymerization accelerator
  3. c) select a printing process for the transfer of ink in a thick layer
  4. d) printing at least one pattern of spaced lines extending along at least one preferential axis with this ink using this method
  5. e) activate the polymerization accelerator by an ad hoc energy supply to polymerize the ink in a thick layer

Suivant une forme de réalisation avantageuse, le motif comprend une zone comprenant un premier réseau de lignes s'étendant suivant un axe préférentiel et au moins une deuxième zone comprenant un deuxième réseau de lignes s'étendant suivant un axe différent de l'axe préférentiel, de façon à produire une image latente sur le document.According to an advantageous embodiment, the pattern comprises an area comprising a first network of lines extending along a preferred axis and at least a second zone comprising a second network of lines extending along an axis different from the preferred axis, to produce a latent image on the document.

Dans ce procédé, l'opération b peut être précédée d'une impression préliminaire. Suivant une variante de réalisation, l'opération b peut aussi être précédée de l'apposition d'un élément préliminaire tel qu'un hologramme.In this method, operation b can be preceded by a preliminary printing. According to an alternative embodiment, the operation b may also be preceded by the apposition of a preliminary element such as a hologram.

Le procédé d'impression est de préférence sélectionné parmi les procédés suivants : la sérigraphie, la flexographie, l'héliogravure.The printing process is preferably selected from the following methods: screen printing, flexography, gravure printing.

De façon avantageuse, l'accélérateur de polymérisation est activé par un apport énergétique par rayonnement électromagnétique, sélectionné parmi les suivants : infrarouges, UV, micro ondes.Advantageously, the polymerization accelerator is activated by an energy supply by electromagnetic radiation, selected from the following: infrared, UV, microwave.

D'autres particularités et avantages de l'invention ressortiront de la description ci après de modes de réalisation particuliers de l'invention, référence étant faite aux dessins annexés dans lesquels :

  • La Fig. 1 est une vue en perspective, avec dimensions exagérées, d'un substrat imprimé suivant le procédé de l'invention.
Other features and advantages of the invention will emerge from the following description of particular embodiments of the invention, reference being made to the appended drawings in which:
  • The Fig. 1 is a perspective view, with exaggerated dimensions, of a printed substrate according to the method of the invention.

La Fig. 1 montre comment le procédé de l'invention permet de réaliser une image latente classique.The Fig. 1 shows how the method of the invention makes it possible to produce a conventional latent image.

Un premier motif A constitué de lignes espacées 1 est formé en relief par le procédé de l'invention sur un substrat 2.A first pattern A consisting of spaced lines 1 is formed in relief by the method of the invention on a substrate 2.

Les lignes en relief 1 s'étendent suivant un axe préférentiel α.The lines in relief 1 extend along a preferred axis α.

Un deuxième motif B, également constitué de lignes espacées 3 est porté sur le même substrat.A second pattern B, also consisting of spaced lines 3 is carried on the same substrate.

Les lignes en relief 3 s'étendent suivant un autre axe préférentielle β, nettement différencié de α, voire perpendiculaire à celui ci.The raised lines 3 extend along another preferred axis β, clearly differentiated from α, or even perpendicular thereto.

Par effet de parallaxe, un observateur regardant le document suivant l'axe préférentiel α éprouvera l'impression que le motif A est moins dense que le motif B. L'intervalle e entre deux lignes 1 apparaît en effet dans toute sa largeur (typiquement, l'intervalle e présente une largeur de l'ordre de 0,1 à 0,2 mm, du même ordre que la largeur des lignes 1 et 3), alors qu'il est partiellement masqué entre les lignes 3. Le phénomène s'inverse évidemment lorsque le document est regardé suivant l'autre axe préférentiel β.By parallax effect, an observer looking at the document along the preferred axis α will experience the impression that the pattern A is less dense than the pattern B. The interval e between two lines 1 indeed appears in all its width (typically the interval e has a width of the order of 0.1 to 0.2 mm, of the same order as the width of the lines 1 and 3), while it is partially hidden between the lines 3. The phenomenon s' obviously inverse when the document is viewed along the other preferential axis β.

Pour obtenir le relief particulier du dispositif de l'invention, on utilise une encre contenant, outre les pigments et une certaine quantité de solvants, des matériaux polymérisables ("vernis", monomères), que l'on dépose sur le substrat approprié en utilisant un procédé d'impression permettant le transfert d'une couche d'encre épaisse et l'utilisation de pigments de grandes dimensions.To obtain the particular relief of the device of the invention, an ink containing, in addition to the pigments and a certain quantity of solvents, polymerizable materials ("varnishes", monomers), which are deposited on the appropriate substrate using a printing process for the transfer of a thick ink layer and the use of large pigments.

Parmi ces procédés, on peut citer, typiquement, la sérigraphie, la flexographie et l'héliogravure.These methods include, typically, screen printing, flexography and gravure printing.

La pratique courante en imprimerie veut que, pour tirer un maximum d'effet optique des pigments dispersés dans l'encre, la couche d'encre soit aussi mince que possible, et donc pratiquement bidimensionnelle. Une couche mince offre également, en général, l'avantage d'une meilleure adhérence sur le support.The current practice in printing is that, in order to obtain the maximum optical effect of the pigments dispersed in the ink, the ink layer is as thin as possible, and therefore practically two-dimensional. A thin layer also, in general, has the advantage of better adhesion to the support.

Ce résultat est généralement obtenu par un séchage classique.This result is generally obtained by conventional drying.

Tout à l'opposé de cette pratique, dans le procédé de l'invention, on procède à un séchage bref avec apport énergétique intense, de façon à obtenir une polymérisation presque instantanée de la couche d'encre, pratiquement sans réduction de volume. En conséquence, on obtient des lignes 1,3 à extension tridimensionnelle (de l'ordre d'une dizaine de µm). Cet apport énergétique peut être réalisé notamment par élévation de la température, par rayonnement électromagnétique, par faisceau d'électrons.Quite the opposite of this practice, in the process of the invention, a brief drying with intense energy supply is carried out so as to obtain an almost instantaneous polymerization of the ink layer, practically without any reduction in volume. As a result, 1.3 lines with three-dimensional extension (of the order of ten μm) are obtained. This energy supply can be achieved in particular by raising the temperature, electromagnetic radiation, electron beam.

Par ailleurs, les motifs en relief A et B peuvent être réalisés par dessus un motif imprimé classique, voire même sur une donnée authentifiant le document, comme une image holographique, qui, par sa seule présence (même s'il s'agit d'un faux grossier) peut suffire à un observateur peu attentif à conclure à l'authenticité d'un document. On notera que le procédé de l'invention permet également une identification et une authentification du document par le toucher, le relief conférant au document une sensation tactile distincte.Furthermore, the relief patterns A and B can be made over a conventional printed pattern, or even on a piece of data authenticating the document, such as a holographic image, which, by its very presence (even if it is a coarse fake) may be enough for an observer who pays little heed to the authenticity of a document. Note that the method of the invention also allows identification and authentication of the document by the touch, the relief giving the document a distinct tactile sensation.

Claims (5)

  1. Relief printing method for printing latent images on a document for preventing the fraudulent reproduction of authentic documents, characterized in that it comprises the following operations:
    a) selecting a substrate (2);
    b) selecting an ink containing a curable material and a cure accelerator;
    c) selecting a printing method allowing transfer of ink as a thick film;
    d) printing at least one pattern (A, B) formed from spaced-apart lines extending along at least one preferential axis with this ink using this method; and
    e) activating the cure accelerator by injecting energy specifically in order to make the ink cure as a thick film, the pattern comprising a region comprising a first array of lines extending along a preferential axis and at least one second region comprising a second array of lines extending along an axis different from the preferential axis, so as to produce a latent image on the document.
  2. Relief printing method according to Claim 1, characterized in that operation B is realised above a classically printed pattern constituting a preliminary printing step.
  3. Relief printing method according to Claim 1, characterized in that operation B is realised above an affixed element constituting a preliminary element.
  4. Relief printing method according to Claim 3, characterized in that the preliminary element is a hologram.
  5. Relief printing method according to any one of the preceding claims, characterized in that the cure accelerator is activated by injecting energy via electromagnetic radiation selected from the following: infrared, UV and microwave.
EP02102063A 2002-07-26 2002-07-26 Method for printing latent images Expired - Lifetime EP1384595B2 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
ES02102063T ES2218507T5 (en) 2002-07-26 2002-07-26 PRINTING PROCEDURE OF LATENT IMAGES.
DE60200552T DE60200552T3 (en) 2002-07-26 2002-07-26 Procedure to print latent images
EP02102063A EP1384595B2 (en) 2002-07-26 2002-07-26 Method for printing latent images
AT02102063T ATE267711T1 (en) 2002-07-26 2002-07-26 METHOD FOR PRINTING LATENT IMAGES

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP02102063A EP1384595B2 (en) 2002-07-26 2002-07-26 Method for printing latent images

Publications (3)

Publication Number Publication Date
EP1384595A1 EP1384595A1 (en) 2004-01-28
EP1384595B1 EP1384595B1 (en) 2004-05-26
EP1384595B2 true EP1384595B2 (en) 2011-08-31

Family

ID=29797290

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02102063A Expired - Lifetime EP1384595B2 (en) 2002-07-26 2002-07-26 Method for printing latent images

Country Status (4)

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EP (1) EP1384595B2 (en)
AT (1) ATE267711T1 (en)
DE (1) DE60200552T3 (en)
ES (1) ES2218507T5 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2942811B1 (en) 2009-03-04 2011-05-06 Oberthur Technologies SECURITY ELEMENT FOR DOCUMENT-VALUE.
GB201117523D0 (en) 2011-10-11 2011-11-23 Rue De Int Ltd Security devices and methods of manufacture thereof
NO2750604T3 (en) 2015-06-25 2018-03-03
PT3415316T (en) 2017-06-13 2020-05-06 Hymmen Gmbh Maschinen & Anlagenbau Method and device for producing a structured surface
DE102019206431A1 (en) 2019-05-03 2020-11-05 Hymmen GmbH Maschinen- und Anlagenbau Method for producing a structure on a surface

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033059A (en) † 1972-07-06 1977-07-05 American Bank Note Company Documents of value including intaglio printed transitory images
WO1987007221A1 (en) † 1986-05-20 1987-12-03 Seri-Print International As Print type with raised characters, as well as a method and print dye to produce print type
EP0432093A1 (en) † 1989-12-07 1991-06-12 Sicpa Holding S.A. Highly reactive printing inks
US5460679A (en) † 1994-02-03 1995-10-24 Triad Technologies International, Inc. Method for producing three-dimensional effect

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5199744A (en) 1988-09-09 1993-04-06 De La Rue Plc Security device
JP2615401B2 (en) 1992-06-04 1997-05-28 大蔵省印刷局長 Anti-counterfeit latent image pattern forming body and method of manufacturing the same
FR2720976B1 (en) * 1994-06-08 1996-07-12 Pechiney Emballage Alimentaire Rotogravure printing process with solvent-free inks.
US6120946A (en) * 1994-10-17 2000-09-19 Corning Incorporated Method for printing a color filter
GB2360250A (en) * 2000-03-17 2001-09-19 Arc Screen Print Ltd Printing whereby different images are discernable at different angles of view

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4033059A (en) † 1972-07-06 1977-07-05 American Bank Note Company Documents of value including intaglio printed transitory images
WO1987007221A1 (en) † 1986-05-20 1987-12-03 Seri-Print International As Print type with raised characters, as well as a method and print dye to produce print type
EP0432093A1 (en) † 1989-12-07 1991-06-12 Sicpa Holding S.A. Highly reactive printing inks
US5460679A (en) † 1994-02-03 1995-10-24 Triad Technologies International, Inc. Method for producing three-dimensional effect

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
R.H.LEACH AND R.J. PIERCE: "The printing ink manual", 1993, KLUWER, article "pp 74-75,78,475,603-604,665", pages: 641 - 642 †

Also Published As

Publication number Publication date
DE60200552T3 (en) 2012-02-09
ATE267711T1 (en) 2004-06-15
ES2218507T3 (en) 2004-11-16
ES2218507T5 (en) 2011-11-21
EP1384595A1 (en) 2004-01-28
EP1384595B1 (en) 2004-05-26
DE60200552T2 (en) 2005-06-02
DE60200552D1 (en) 2004-07-01

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