EP2004420B1 - Élément de sécurité et son procédé de fabrication - Google Patents

Élément de sécurité et son procédé de fabrication Download PDF

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Publication number
EP2004420B1
EP2004420B1 EP07723373.2A EP07723373A EP2004420B1 EP 2004420 B1 EP2004420 B1 EP 2004420B1 EP 07723373 A EP07723373 A EP 07723373A EP 2004420 B1 EP2004420 B1 EP 2004420B1
Authority
EP
European Patent Office
Prior art keywords
layer
security element
security
embossed
liquid crystal
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.)
Active
Application number
EP07723373.2A
Other languages
German (de)
English (en)
Other versions
EP2004420A1 (fr
Inventor
Winfried HOFFMÜLLER
Theodor Burchard
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.)
Giesecke and Devrient GmbH
Original Assignee
Giesecke and Devrient GmbH
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Publication date
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Publication of EP2004420A1 publication Critical patent/EP2004420A1/fr
Application granted granted Critical
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Active legal-status Critical Current
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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/29—Securities; Bank notes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/364—Liquid crystals
    • B42D2033/26—
    • B42D2035/24—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
    • B42D25/21—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose for multiple purposes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/355—Security threads
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/369—Magnetised or magnetisable materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/425—Marking by deformation, e.g. embossing
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24802—Discontinuous or differential coating, impregnation or bond [e.g., artwork, printing, retouched photograph, etc.]

Definitions

  • the invention relates to a security element for security papers, documents of value and the like having a diffraction structure which has an embossed relief structure and a covering layer which increases the visibility of the diffraction effect of the embossed relief structure.
  • the invention also relates to a security paper and a value document with such a security element and to a method for producing such security elements.
  • Holograms, holographic grids and other hologram-like diffraction patterns are widely used to authenticate credit cards, value documents, product packaging and the like.
  • Such diffractive optical structures for security elements are for example in the document EP 0 330 733 A1 described.
  • holograms and hologram diffraction patterns have increasingly been used not only as security features but also purely decoratively in safety-critical applications, so that the observers' attention to holograms used as security features is waning.
  • the characteristic visual effect is often no longer perceived by the observers as a security feature, but merely as a design variant.
  • conventional embossed holograms have no special protection against counterfeiting.
  • the publication WO 2005/063495 A1 relates to a discrimination medium that is freely printable and not easily counterfeitable, whose authenticity can be easily distinguished by a specific appearance and that can be produced inexpensively.
  • a discriminating medium For example, a cholesteric liquid crystal layer, a multilayer film and a breakable pressure recording layer are laminated.
  • the multilayer film has a plurality of light-transmissive films laminated and having a different refractive index.
  • the distinguishing medium shows a specific appearance such as a letter, a symbol, a pattern or a figure formed by printing with a thermal printer or the like and changing color depending on the viewing angle.
  • the invention has for its object to provide a generic security element that avoids the disadvantages of the prior art and in particular has a high anti-counterfeiting security.
  • a method for producing such a security element is to be specified.
  • the relief structure is formed on the basis of a cholesteric liquid-crystalline material and that the cover layer contains a reflective and / or a high-index layer.
  • This design combines a prominent holographic effect with a striking and highly visible color-shift effect.
  • the relief structure is formed from a cholesteric liquid-crystalline polymer material.
  • the layer thickness The embossed relief structure is in this variant preferably between about 1.5 nm and about 4 microns.
  • the liquid-crystalline material of the relief structure is present in the form of pigments which are embedded in a binder matrix.
  • the binder expediently has thermoplastic properties.
  • the preferred layer thicknesses are therefore greater values in the range of about 3 microns to about 10 microns.
  • the liquid-crystalline material is in crosslinked form. This can be done, for example, by the Use of a UV-crosslinking liquid crystal system can be achieved, as described in more detail below.
  • a UV-crosslinking liquid crystal system can be achieved, as described in more detail below.
  • Such liquid crystal systems can be advantageously formed by combining a nematic liquid crystal system with a twisting device.
  • suitable UV-crosslinking liquid crystal systems are free-radically curing liquid crystal systems in which the UV crosslinkability via reactive double bonds, such as acrylate groups, is achieved.
  • the overall system is formulated so that buildup on the stamping tool can be avoided.
  • the choice of the binder is decisive for the structural stability of an embossment.
  • the binder is preferably thermoplastic.
  • PMMA thermoplastic binder PMMA into consideration.
  • a UV-crosslinking system can be used as a binder.
  • suitable UV-crosslinking systems are polyester acrylates, polyurethane acrylates, polyether acrylates and epoxy acrylates in conjunction with a suitable reactive diluent.
  • the liquid-crystal pigments are preferably formed by crosslinked liquid crystals which are temperature-stable.
  • the cover layer contains an at least partially present, reflective metal layer, which may have recesses in the form of patterns, characters or codes.
  • a high refractive index layer is advantageously arranged above the reflective layer. Both in cases where the high-index layer is combined with a reflective layer, as well as in cases where the cover layer contains only one high-index layer, it can be formed, for example, from ZnS or TiO 2 .
  • the liquid-crystalline material of the relief structure is preferably applied to a carrier film designed for aligning liquid crystals.
  • the carrier foil may also be provided with an alignment layer for aligning liquid crystals.
  • a smooth PET film of good surface quality can advantageously be used as the carrier film.
  • the carrier film may also comprise a plurality of partial layers, for example an above-mentioned alignment layer.
  • an alignment layer for example, a layer of a linear photopolymer, a finely structured layer or a trained by exerting shear forces layer is possible.
  • a suitable finely structured layer can be produced for example by embossing, etching or scoring.
  • the security element may include an absorbing background area for viewing the diffraction effect and the color shift effect.
  • the background region is formed in particular by a dark, for example black, printing layer and may also contain other security features, such as magnetic or electrically conductive feature substances.
  • the security element may also contain one or more further layers of liquid-crystalline material.
  • the diffraction structures form a matt structure and thus a matt, preferably silvery matt appearance.
  • the relief structures of the diffraction structures in this case contain a grid pattern influencing electromagnetic radiation, which is characterized by the parameters orientation, curvature, spacing and profiling and for which at least one of these parameters varies randomly over the area of the grid area, ie is subject to a statistical distribution.
  • the described security element may in particular be a security strip, a security thread, a label or a transfer element for application to a security paper, value document and the like.
  • the invention also encompasses a security paper for the production of security documents, such as banknotes, identity cards or the like, which is equipped with a security element described above, as well as a value document equipped with a security element described above, such as a banknote.
  • the layer is printed in step a) on the basis of the cholesteric liquid-crystalline material, wherein the printing method is selected according to the requirements of the paint system used.
  • the layer applied in step a) can be precured in the manner described in more detail below.
  • the applied layer in the embossing in step b) is suitably radiation-cured at least to the extent that the embossed structures do not flow during the subsequent process steps. Curing during embossing is effected in particular by applying the applied layer with UV radiation or electron radiation. This application can be carried out through the carrier film or through the embossing tool.
  • the embossed layer is advantageously cured, in particular by exposure to UV radiation or electron radiation.
  • this step forms the main cure, as described in more detail below.
  • the embossed layer is provided in step c) first at least partially with a reflective metal layer.
  • the metal layer can also be generated in this step with recesses in the form of patterns, characters or codes, including, for example, from the publication WO 99/23257 A1 known washing process can be used.
  • a high-index layer is advantageously applied in step c).
  • the high-index layer is vapor-deposited by a vacuum vapor method.
  • Fig.1 shows a schematic representation of a banknote 10, which is provided with two security elements 12 and 16 according to embodiments of the invention.
  • the first security element represents a security thread 12 which at certain window areas 14 on the surface of the banknote 10, while being embedded in the intervening areas inside the banknote 10.
  • the second security element is formed by a glued transfer element 16 of any shape.
  • Fig. 2 schematically shows the layer structure of a security element according to the invention 20 in cross section, wherein only the elements of the layer structure required for the explanation of the principle of operation are shown.
  • a lacquer layer 24 made of a cholesteric liquid crystal material which exhibits the desired color-shift effect is printed on a plastic carrier foil 22.
  • a printing process it is possible to use all processes known to the person skilled in the art and tailored to the requirements of the coating system used.
  • the orientation of the liquid-crystalline material is preferably carried out directly over the carrier film.
  • the liquid-crystal lacquer layer 24 can first be pre-cured.
  • the lacquer may contain, for example, two photoinitiators which can be activated at different UV wavelengths.
  • the first photoinitiator may be UV-activatable while the second photoinitiator is activated by electron beam irradiation. In both designs, the first photoinitiator is used for the pre-cure, which can be carried out, for example, to the gel point of the paint.
  • the desired relief pattern 26 is embossed into the pre-cured or non-pre-cured lacquer layer 24. If the lacquer layer is not pre-cured, it is hardened during the embossing either through the carrier foil 22 or through the embossing tool with radiation to the extent that a flow of the structures is excluded in the context of the process.
  • the curing can be done by UV radiation or by electron beam.
  • the embossing tool may be made of a UV transparent material, such as quartz or a suitable polymer, to allow the lacquer layer to be exposed by the embossing tool.
  • a transparent plastic film is used as a carrier film, UV curing can also take place through the film.
  • PET films starting from the visible spectral range, down to about 310 nm are transparent.
  • commercially available UV sources can be used.
  • the lacquer layer 24 is cured in order to ensure tack-free and mechanical stability.
  • “Tack-free” means that the lacquer layer is substantially tack-free in terms of a substantially non-sticky surface, so that under a certain weight load stacked, coated pieces of film can subsequently be separated from each other again without damage.
  • this second cure is the "main cure” that is triggered by excitation of the second photoinitiator.
  • the activation of the first and second photoinitiator can be effected by different UV wavelengths, or by UV radiation (first photoinitiator) and electron radiation (second photoinitiator).
  • a metal layer 28 with recesses 30 in the form of patterns, characters or codes is produced on the cured liquid-crystal lacquer layer 24.
  • these recesses 30 are often designed in the form of negative writing.
  • Such negative-type metal layer can be obtained, for example, by means of the reference in the publication WO 99/23257 A1 demetallticiansvons described be generated.
  • the desired patterns, characters or codes are printed on the cured lacquer layer 24 with a high pigment ink. Due to the high pigment content, the ink forms a porous, sublime color after drying.
  • the printed lacquer layer is then provided with a thin metal layer which, in the area of the paint application, only partially covers the color body because of its large surface area and the porous structure.
  • the paint application and the overlying metal layer can then be washed out with a suitable solvents are removed, so that recesses 30 are generated in the metal layer in the originally printed areas.
  • a high-index ZnS layer 32 is vapor-deposited over its entire area onto the previously obtained layer sequence.
  • the absorbent background may be a separate object held behind the security element.
  • a dark, in particular black imprint can be provided elsewhere on the banknote, over which a security element present in a window area of the banknote can be laid by bending the banknote.
  • the absorbing background may be formed by a background area integrated in the security element itself, as now with reference to FIGS FIGS. 3 and 4 described.
  • a lacquer layer 44 of a cholesteric liquid crystal material having a desired color-shift effect was printed on a carrier foil 42 and a desired relief pattern 46 in FIG the lacquer layer 44 embossed.
  • a high-index ZnS layer 48 was then vapor-deposited over the whole area and the resulting layer sequence was coated with a black printing ink 50 or a black magnetic ink.
  • the layer sequence 40 When used as a security element, the layer sequence 40 is transferred via a heat seal system (primer / heat sealing lacquer) or a laminating adhesive, for example, to banknote paper or a security thread structure, and the carrier film 42 is peeled off. Also in the embodiment of Fig. 3 in which a metal layer is omitted, both the hologram contained in the relief pattern 46 and the color-shift effect of the liquid crystals of the resist layer 44 appear brilliantly by the refractive index jump between ZnS layer 48 and liquid crystal resist 44 against the dark background of the black ink 50 ,
  • the embossing may or may not be associated with UV curing.
  • UV-curable cholesteric liquid-crystal mixtures can, as mentioned above, also be suitably precured, so that although hot-stamping is still possible, bleeding of the structure formed is precluded.
  • the UV-curable cholesteric liquid-crystal mixtures can also be printed from a solvent, in particular ethers, ketones or aromatics, and crosslinked after thermal solvent drying by radiation (UV or electron beam).
  • Fig. 4 instead of lacquer layers of liquid crystal polymers, it is also possible to use effect lacquers 62 in which the cholesteric liquid crystal material is present in the form of pigments 66 embedded in a binder matrix 64.
  • the binder 64 preferably behaves thermoplastic during embossing.
  • the pigments 66 may even be substantially larger in size than the embossed structure, as long as they are only transparent. Namely, the holographic effect does not depend on the size of the pigments, but rather arises from the embossing of the (thermoplastic) binder and the cover layer arranged behind it, as seen by the observer, which contains a high-index and / or a metallic layer.
  • the cover layer consists only of a high refractive index ZnS layer 68.
  • a black print layer 70 is also provided as a background layer in this embodiment.
  • Fig. 4 shows the representation of Fig. 4 the layer sequence of the security element 60 after the transfer to a target substrate, in the exemplary embodiment a banknote paper 72.
  • the layer sequence was applied to the banknote paper 72 by means of a laminating adhesive 74 and the carrier film required for the production of the security element using a release or release layer, for example, a wax layer, detached.

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  • Accounting & Taxation (AREA)
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  • Crystallography & Structural Chemistry (AREA)
  • Credit Cards Or The Like (AREA)

Claims (25)

  1. Elément de sécurité (20) pour papiers de sécurité, documents de valeur et analogues comprenant une structure à diffraction qui présente une structure en relief gaufrée (24, 26) et une couche de couverture (28, 32) augmentant la visibilité de l'effet de diffraction de la structure en relief (24, 26) gaufrée, caractérisé en ce que la structure en relief (24, 26) est formée à base d'un matériau cristal liquide cholestérique et que la couche de couverture (28, 32) contient une couche réfléchissante (28) et/ou une couche à indice de réfraction élevé (32).
  2. Elément de sécurité (20) selon la revendication 1, caractérisé en ce que la structure en relief (24) est formée dans un matériau polymère cristal liquide cholestérique.
  3. Elément de sécurité (20) selon la revendication 2, caractérisé en ce que la structure en relief (24, 26) gaufrée présente une épaisseur de couche entre environ 1,5 µm et environ 4 µm.
  4. Elément de sécurité (20) selon la revendication 1, caractérisé en ce que le matériau cristal liquide de la structure en relief (62) est sous forme de pigments (66) enchâssés dans une matrice de liant (64).
  5. Elément de sécurité (20) selon la revendication 4, caractérisé en ce que le liant (64) présente des propriétés thermoplastiques.
  6. Elément de sécurité (20) selon la revendication 4 ou 5, caractérisé en ce que la structure en relief (62) gaufrée présente une épaisseur de couche entre environ 3 µm et environ 10 µm.
  7. Elément de sécurité (20) selon au moins l'une des revendications 1 à 6, caractérisé en ce que le matériau cristal liquide est sous forme réticulée.
  8. Elément de sécurité (20) selon au moins l'une des revendications 1 à 7, caractérisé en ce que la couche de couverture contient une couche de matériau (28) réfléchissante présente au moins par zones.
  9. Elément de sécurité (20) selon au moins l'une des revendications 1 à 8, caractérisé en ce qu'une couche (32) à indice de réfraction élevé est disposée dans la couche de couverture au-dessus de la couche réfléchissante (28).
  10. Elément de sécurité (20) selon au moins l'une des revendications 1 à 9, caractérisé en ce que le matériau cristal liquide de la structure en relief est appliqué sur un film support (22) conçu pour orienter les cristaux liquides ou sur un film support doté d'une couche d'orientation pour orienter les cristaux liquides.
  11. Élément de sécurité (20) selon au moins l'une des revendications 1 à 10, caractérisé en ce que l'élément de sécurité (20) contient une zone de fond (50 ; 70) absorbante pour observer l'effet de diffraction et l'effet de changement de couleur.
  12. Élément de sécurité (20) selon la revendication 11, caractérisé en ce que la zone de fond est formée par une couche d'impression (50 ; 70) foncée, en particulier noire.
  13. Élément de sécurité (20) selon la revendication 11 ou 12, caractérisé en ce que la zone de fond (50 ; 70) présente une caractéristique de sécurité supplémentaire, en particulier une substance caractéristique magnétique ou conductrice électriquement.
  14. Élément de sécurité (20) selon au moins l'une des revendications 1 à 13, caractérisé en ce que l'élément de sécurité (20) contient une ou plusieurs couche(s) supplémentaire(s) de matériau cristal liquide.
  15. Élément de sécurité (20) selon au moins l'une des revendications 1 à 14, caractérisé en ce que l'élément de sécurité (20) est une bande de sécurité, un fil de sécurité, une étiquette ou un élément de transfert destiné à être appliqué sur un papier de sécurité, un document de valeur ou analogues.
  16. Papier de sécurité pour la fabrication documents de sécurité comme des billets de banque, cartes d'identité ou analogues, doté d'un élément de sécurité (20) selon au moins l'une des revendications 1 à 15.
  17. Document de valeur (10) comme un billet de banque, un chèque, un document officiel, une carte d'identité ou analogues, doté d'un élément de sécurité (20) selon au moins l'une des revendications 1 à 15.
  18. Procédé de fabrication d'un élément de sécurité (20) selon au moins l'une des revendications 1 à 15, dans lequel
    a) une couche à base d'un matériau cristal liquide cholestérique est appliquée sur un film support (22),
    b) la couche appliquée est gaufrée en une structure en relief (24, 26) d'une structure à diffraction souhaitée, et
    c) la couche gaufrée (24, 26) est dotée d'une couche de couverture (28, 32) augmentant la visibilité, laquelle contient une couche réfléchissante (28) et/ou une couche à indice de réfraction élevé (32).
  19. Procédé selon la revendication 18, caractérisé en ce que la couche à matériau cristal liquide cholestérique est imprimée à l'étape a).
  20. Procédé selon la revendication 18 ou 19, caractérisé en ce que la couche appliquée à l'étape a) est prédurcie avant le gaufrage de l'étape b).
  21. Procédé selon au moins l'une des revendications 18 à 20, caractérisé en ce que la couche appliquée lors du gaufrage de l'étape b) est au moins durcie au point que, en particulier par application de rayonnement UV ou faisceau électronique, que les structures gaufrées ne coulent pas lors des étapes de procédé suivantes.
  22. Procédé selon la revendication 21, caractérisé en ce que l'application à l'étape b) s'effectue à travers le film support (22) ou à travers l'outil de gaufrage.
  23. Procédé selon au moins l'une des revendications 18 à 22, caractérisé en ce que la couche gaufrée (24, 26) est durcie avant l'application de la couche de couverture (28, 32) à l'étape c), en particulier par application de rayonnement UV ou faisceau électronique.
  24. Procédé selon au moins l'une des revendications 18 à 23, caractérisé en ce que la couche gaufrée (24, 26) à l'étape c) est dotée d'une couche métallique (28) réfléchissante au moins par zones.
  25. Procédé selon au moins l'une des revendications 18 à 24, caractérisé en ce qu'à l'étape c), une couche à indice de réfraction élevé (32) est appliquée, en particulier est vaporisée par un procédé de vapeur à vide.
EP07723373.2A 2006-03-31 2007-03-19 Élément de sécurité et son procédé de fabrication Active EP2004420B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102006015023A DE102006015023A1 (de) 2006-03-31 2006-03-31 Sicherheitselement und Verfahren zu seiner Herstellung
PCT/EP2007/002406 WO2007115648A1 (fr) 2006-03-31 2007-03-19 Élément de sécurité et son procédé de fabrication

Publications (2)

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Also Published As

Publication number Publication date
CN101410257B (zh) 2012-11-14
US8968856B2 (en) 2015-03-03
CN101410257A (zh) 2009-04-15
EP2004420A1 (fr) 2008-12-24
WO2007115648A1 (fr) 2007-10-18
US20090115185A1 (en) 2009-05-07
DE102006015023A1 (de) 2007-10-04

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