FR2671032A1 - INFALSIFIABLE DOCUMENT LAMINATED WITH HOLOGRAM AND METHOD FOR MANUFACTURING SUCH A DOCUMENT. - Google Patents

Abstract

The invention relates to the protection of documents against forgery. It relates more particularly to a laminated forgery-proof document comprising a support (1) having a marking zone (2) having two faces (2a and 2b) bearing information (3b) forming reliefs (3a) on one of its faces ( 2a) and hollows (3b) on the other of its faces (2b) and comprising a hologram (4) carrying a holographic interference pattern, at least partially covering the marking area (2). The hologram (4) is fixed on the face (2b) of the marking zone (2) carrying the information forming the hollows. A layer of adhesive (5) secures the hologram 4 on the marking area (2).

Description

The invention relates to security documents such as cards

  of identity, passports, bank notes, credit cards etc that are manufactured or processed from

  so as to be made tamper-proof and be authenticated.

  Holographic films are now commonly affixed to numerous documents (credit cards, passports, banknotes, etc.) which they make very difficult to counterfeit. They include the recording of an interference figure which it is impossible to reproduce. without having the original matrix They are therefore in themselves tamper-proof In addition, known techniques have been associated with holography (hot stamping films, methods of making security stickers,) to achieve the affixing of

holograms on these documents.

  We can for example heat transfer a

  hologram, stamped on a document or object.

  The hologram is then perfectly secured to its support and cannot be dissociated from it without deterioration. The holograms can also be stamped on very fragile films which do not allow the holograms to be moved.

without being destroyed.

  Certain documents such as for example credit cards carry information in relief whose

  protection presents particular difficulties.

  Indeed, a certain number of falsifications were noted by de-embossing of the cards, this operation making disappear the initial information and re-embossing so as to record new information. The object of the invention is to make it impossible

type of forgery.

  To this end, the invention relates to a forgery-resistant laminated document comprising a support having a marking area having two faces, carrying information forming reliefs on one of its faces and hollows on the other of its faces and comprising a hologram. overlapping

  at least partially the marking area.

  According to the invention, the hologram is fixed to the face of the marking zone carrying the intaglio information and it comprises an adhesive layer ensuring the fixing of

  the hologram on the marking area.

  According to a preferred embodiment the hologram of the tamper-evident document includes an index layer

  bearing the figure of holographic interference.

  This layer is preferably associated with a layer of varnish and can be covered with a layer of

plastic protection.

  The invention also relates to a method of manufacturing a laminated unforgeable document comprising a support having a marking zone having two faces carrying information forming reliefs on one of its faces and recesses on the other of its faces and comprising a hologram carrying a holographic interference figure according to the invention:

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  the information is recorded on the support then the hologram is fixed on the face of the support on which the information forms hollows at

using a layer of adhesive.

  The invention will be described in more detail with reference to the drawings in which: Figure 1 is a front view of a credit card according to the invention Figure 2 is a partial sectional view AA of the credit card shown in Figure 1 in a first embodiment Figure 3 is a partial sectional view AA of the credit card shown in Figure 1 according to a

second embodiment.

  Credit cards have elements

relief information.

  They are generally recorded on a medium 1

  by stamping, embossing or stamping.

  More precisely by such a method a marking area 2 of a support 1 is deformed on one of its faces 2 has the information 3 forms the reliefs 3 a while on the other face 2 b these same information forms

hollow 3 b.

  Different materials can be used to form the support 1 Generally synthetic materials called plastics are used to make it This support can itself be laminated and carry other information recorded by different means (printed information, magnetic information). The information 3 is generally readable by observation of the face of the card 2 a on which the

information forms reliefs.

  A hologram 4 is fixed on the face 2b of the support 2 in which the recording of information has formed

  hollows 3 b & using a layer of adhesive 5.

  Thus, by this arrangement, any attempt to de-emboss the card which would lead to the elimination of the reliefs 3 a on the face 2 a, followed by a re-embossing operation necessary to give the card a classic appearance would induce deformation of the hologram 4

  producing its irreversible destruction.

  Thus, surprisingly this arrangement of the hologram on the credit card considerably increases its reliability and makes it possible to avoid a form

particular falsification.

  The process for manufacturing a laminated tamper-proof document of the type described above comprises a first phase according to which the information 3 is recorded on the support. This recording is

  generally made by embossing, hot or cold.

  Then and therefore only after the information 3 has been recorded the hologram 4 is fixed on the face 2 b of the support 1 on which the previously recorded information forms hollows 3 b. This fixing is carried out using a layer of adhesive. Different types of 4 holograms can be

  used for the production of the unforgeable document.

  Here we call a hologram an object generally made up of several layers, one of which carries a figure

holographic interference.

  The carrier layer of the holographic interference figure can be either a transparent layer 6 called the index layer because its refractive index is different from at least one of the layers with which

she is in touch.

  Thus deformations produced by stamping on this index layer allows the production of a hologram.

says stamped hologram.

  It can also be a metallized layer (most often of aluminum) also deformed by stamping. The stamping can be carried out directly on the index layer or on the metallization layer 6; according to another manufacturing process the hologram comprises a layer of varnish 7 This layer is stamped and then covered with the index layer or the metallization which then adopt the shape of the surface of the layer of

stamped varnish.

  In order to improve the resistance of the hologram 4 during normal use of the credit card, it is advantageously covered with a protective layer 8 of plastic material. This protective layer 8 can for example be a plastic material of the type polyvinyl chloride or polyester It can also contribute to

  ensure the flatness of the hologram.

  When this protective layer 8 is not on the surface of the document, the hologram is preferably covered with an additional layer of varnish.

protection 10.

  The forgery-proof document described above is of excellent quality and the tests that have been carried out do not allow us to imagine how information elements 3 initially recorded could be modified or replaced by other information elements

by forgers.

  However, it may be considered useful to introduce into the hologram 4 a layer called the detachment layer 9 which has the effect that any attempt to modify the information leads to a very apparent destruction of

hologram 4.

  This release layer 8 is generally placed between the varnish layer and the protective layer.

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  Such a wax-based layer is known in itself. It does not reduce the resistance, for example the abrasion resistance of the hologram 4 during normal use of the card, but will produce the detachment of the layer. protective 8 when trying to modify

3 recorded information.

Claims (9)

  1 Falsifiable laminated document comprising a support (1) having a marking area (2) having two faces (2 a and 2 b) carrying information (3 b) forming reliefs (3 a) on one of its faces ( 2 a) and recesses (3 b) on the other of its faces (2 b) and comprising a hologram (4) carrying a holographic interference pattern, at least partially covering the marking area (2) characterized in that the hologram (4) is fixed to the face (2b) of the marking area (2) carrying the information forming recesses, and that it comprises a layer of adhesive (5) ensuring the fixing of hologram 4 on the area of marking (2).   2 laminable tamper-evident document according to claim 1 characterized in that the support (1) is in plastic material.   3 Falsifiable document laminated according to claim 2 characterized in that the information (3)   are recorded on the support (1) by stamping.   4 Falsifiable document stratified according to one   any one of claims 1 to 3 characterized in that   the hologram (4) comprises an index layer (6) bearing   the holographic interference figure.   5 Falsifiable document stratified according to one   any one of claims 1 to 3 characterized in that   the hologram (4) comprises a metallized layer carrying the   holographic interference pattern.   6 Falsifiable document stratified according to one   any one of claims 4 or 5 characterized in that   the hologram (4) comprises a layer of varnish (7).   7 Falsifiable document stratified according to one   any one of claims 4 to 6 characterized in that   the hologram (4) comprises a protective layer (8) in plastic material.   8 Falsifiable document stratified according to one   any one of claims 4 to 8 characterized in that   the hologram (4) has a release layer (9).   9 Method for manufacturing a laminated unforgeable document comprising a support (1) having a marking area (2) having two faces (2 a and 2 b) carrying information (3) forming reliefs (3 a) on the one of its faces (2 a) and hollows (3 b) on the other of its faces (2 b) and comprising a hologram (4) carrying a holographic interference pattern characterized in that: the information (3) on the support (1) the hologram (4) is then fixed on the face (2b) of the support on which the information forms hollows using a layer of adhesive.