EP3363652B1 - Matériau de transfert d'éléments de sécurité et son procédé de fabrication - Google Patents

Matériau de transfert d'éléments de sécurité et son procédé de fabrication Download PDF

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Publication number
EP3363652B1
EP3363652B1 EP18000151.3A EP18000151A EP3363652B1 EP 3363652 B1 EP3363652 B1 EP 3363652B1 EP 18000151 A EP18000151 A EP 18000151A EP 3363652 B1 EP3363652 B1 EP 3363652B1
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EP
European Patent Office
Prior art keywords
layer
security element
cutout
layers
composite
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German (de)
English (en)
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EP3363652B2 (fr
EP3363652A1 (fr
Inventor
Christian Fuhse
Josef Schinabeck
Björn Teufel
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Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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    • 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
    • B42D25/342—Moiré effects
    • 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
    • B42D25/346—Perforations
    • 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
    • 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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/373—Metallic 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
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • 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
    • 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
    • B42D25/45—Associating two or more layers
    • B42D25/455—Associating two or more layers using heat
    • 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
    • B42D25/45—Associating two or more layers
    • B42D25/46—Associating two or more layers using pressure
    • 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
    • B42D25/45—Associating two or more layers
    • B42D25/465—Associating two or more layers using chemicals or adhesives
    • B42D25/47—Associating two or more layers using chemicals or adhesives using adhesives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44C—PRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C1/00—Processes, not specifically provided for elsewhere, for producing decorative surface effects
    • B44C1/16—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like
    • B44C1/165—Processes, not specifically provided for elsewhere, for producing decorative surface effects for applying transfer pictures or the like for decalcomanias; sheet material therefor
    • B44C1/17—Dry transfer
    • B44C1/1712—Decalcomanias applied under heat and pressure, e.g. provided with a heat activable adhesive

Definitions

  • the invention relates to a security element transfer material, comprising: a security element layer composite which has a plurality of layers, including at least one feature layer developing an optically variable effect and an adhesive layer, the feature layer being the layer that is applied after a security element has been transferred a value document substrate faces a viewer; a carrier substrate which is detachably connected to the feature layer of the security element layer composite; a mask layer having at least one recess, which is such that the security element layer composite in the area of the at least one recess of the mask layer can be glued to the value document substrate by the action of pressure and possibly heat by means of the adhesive layer and then detached from the carrier substrate, in the area outside of the at least one recess in the mask layer, the security element layer composite is prevented from sticking to the value document substrate and the subsequent detachment of the security element layer composite from the carrier substrate is prevented.
  • the invention also relates to a method for producing the security element transfer material.
  • Valuables such as branded items or documents of value, in particular banknotes, are often equipped with security elements which allow the authenticity of the valuable object to be checked and which at the same time serve as protection against unauthorized reproduction.
  • the security elements used for this are often not individually but in shape provided by transfer tapes with a multiplicity of security elements designed as transfer elements. It is characteristic of transfer tapes that the security elements are prepared on a carrier layer, with the order of the layers of the transfer elements having to be reversed, as it should later be present on the object to be protected. During the transfer, the carrier layer is typically peeled off from the layer structure of the security elements.
  • the transfer tapes On the side opposite the carrier layer, the transfer tapes have an adhesive layer, usually made of a heat-sealing adhesive or heat-sealing lacquer, which melts during the transfer of the security elements and bonds the security elements to the object to be secured.
  • the transfer tape with the heat-sealing adhesive layer is placed on the object and pressed on by means of a heated transfer stamp or a transfer roller and transferred to the object in the shape of the heated transfer stamp.
  • Transfer elements, transfer belts and the transfer of transfer elements to target substrates are for example in the EP 0 420 261 B1 and the WO 2005/108108 A2 described.
  • transfer elements for example transfer patches
  • transfer elements do not tear off cleanly at the border of the heated area. This leads to unclean edges and possibly also to the fact that remnants of the film composite, which were torn from the layer composite in the non-bonded area, stick to the transferred patches. These residues are undesirable because they later loosen and, in the form of impurities, impair subsequent processing steps, e.g. printing processes.
  • the individual transfer elements can also already be present on the transfer belt in the desired outline shape.
  • the prefabrication of separate individual security elements makes sense, for example, if the security elements have a layer structure that makes it difficult to sever the entire layer structure precisely during the transfer process. This is the case, for example, when the layer structure of the security element to be transferred contains a permanent carrier substrate, for example a plastic film. Carrier substrates within the layer structure of security elements are useful if the security elements have to be made particularly stable, for example if they have to be self-supporting because they are to be used to close a through opening in the object to be secured.
  • Security elements the layer structure of which comprises a stable carrier substrate, typically a plastic film, must be present on a transfer material as prefabricated individual elements, which means that the outline of the security elements must be precut in the security element material.
  • the pre-cutting can be carried out, for example, by means of a laser.
  • the depth of cut has to be controlled very precisely in order, on the one hand, to cut through the entire layer structure of the security element, but, on the other hand, not to damage the carrier material that is separated during the transfer.
  • Plastic films are usually used as carrier materials. Plastic films have a high tear resistance, but a low tear resistance. If they are cut, it can hardly be avoided that the security element transfer material present as a continuous material tears in some places in the course of the process of transferring the security elements to objects of value. It must also be taken into account that the layer structures to be cut or the carrier foils that are not to be cut are materials with thicknesses in the micrometer range.
  • the security element layer structures typically have thicknesses in the range from about 20 ⁇ m to 30 ⁇ m, and the carrier films typically have thicknesses in the range from 10 ⁇ m to 20 ⁇ m.
  • a security element transfer material in the form of a continuous material, in which the security elements are pre-cut in the desired outline shapes, and the pre-cut elements then without the risk of tearing the Carrier material can be transferred to products to be secured is from the WO 2010/031543 A1 known.
  • the security element transfer material is an endless material, in particular a tape with a length of several hundred meters and a width of a few millimeters / centimeters up to several meters.
  • the security element transfer material has a security element layer composite, ie the actual security element material, and a temporary carrier, ie the material on which the security elements are “stored”.
  • the temporary carrier is based on a carrier layer composite, consisting of a first and a second temporary carrier substrate, which are permanently bonded by means of an adhesive layer.
  • the security element layer composite is connected to a temporary carrier either directly or by means of a release layer.
  • the release layer is of a conventional type and facilitates the detachment of the security elements from the temporary carrier during the transfer process to an object of value.
  • the temporary carrier is located on the side of the security element layer composite which, after the transfer of the security elements, faces a viewer.
  • temporary carrier substrates expresses that, in contrast to the “permanent” carrier substrate, these carrier substrates are not part of the security elements.
  • the formation of the temporary carrier as a carrier layer composite prevents the stability of the temporary carrier from being impaired by cutting the temporary carrier when the contour shapes of the security elements are cut.
  • a comparable result cannot simply be achieved by making a single temporary carrier film correspondingly thicker, since plastic films have a low tear resistance, i.e. if a film is only slightly cut, it tears further and under certain circumstances completely.
  • Consists of a first and a second temporary carrier substrate which are permanently bonded by means of an adhesive layer: even if one of the temporary carrier substrates is completely severed, the further temporary carrier substrate (or possibly the further temporary carrier substrates) generally remains undamaged and accordingly stable.
  • the adhesive also forms an additional "buffer zone" between the temporary carrier substrates.
  • the one in the WO 2010/031543 A1 The method described consists of weeding the patch film before application.
  • the shapes of the patch are punched into the layers to be transferred with a punch, ie the layers are broken through with the punch.
  • these layers are then peeled off in the areas outside the patch, while they remain on the carrier film in the patch areas. This ensures that the patches have clean edges after application.
  • a disadvantage of this method is that the layer structure must have sufficient stability for weeding, which can be done, for example, by introducing a stabilizing film layer. However, this is again associated with an increase in the thickness of the finished patch, which is undesirable in practice.
  • the WO 2010/072339 A2 and the WO 2012/164011 A1 each describe a method for producing a security element and a transfer film.
  • the invention is based on the object of providing a method for transferring a transfer element, for example a transfer patch, in which, on the one hand, a small thickness of the finished patch and, on the other hand, a reliable transfer of the patch with clean edges can be achieved.
  • the carrier substrate of the security element transfer material is in particular a film.
  • the carrier substrate of the security element transfer material can, however, also be a carrier layer composite consisting of a first film and a second film, which are permanently glued by means of an adhesive layer.
  • viewing in incident light is illumination of the document of value from one side and viewing of the document of value from the same side. Viewing in incident light is thus present, for example, when the front of the document of value is illuminated and also viewed.
  • viewing in transmitted light is illumination of a document of value from one side and viewing of the document of value from another side, in particular the opposite side. Viewing in transmitted light is thus present, for example, when the back of the document of value is illuminated and the front of the document of value is viewed. The light thus shines through the value document.
  • a value document within the meaning of the invention can be, for example, banknotes or identity documents, but also shares, certificates, postage stamps, checks, tickets, tickets, flight tickets, ID cards, visa stickers or the like, as well as labels, seals, packaging or other elements.
  • the simplifying term “document of value” therefore always includes documents of the type mentioned in the following.
  • the term value document also includes security paper for the production of bank notes.
  • bank note includes in particular one Paper bank note, a polymer bank note, or a film composite bank note.
  • the transfer element i.e. the security element to be transferred
  • the invention is described in the following detailed description using the example of a transfer patch, and is therefore not to be construed as being restricted to a patch.
  • the functional layer can be a single (functional) layer or several (functional) layers.
  • Transfer patches are used, for example, in the first series of EURO banknotes, e.g. in the form of the hologram patch applied to the EURO 50 banknote.
  • a transfer material can be realized in accordance with the following preferred embodiment:
  • the starting point is a conventional transfer film structure, such as that used, for example, for the application of transfer strips.
  • a structure is based on a carrier film, one or more functional layers on it and a heat-sealing lacquer layer.
  • the Functional layers provide optically variable security features, for example embossed holograms, micromirror elements, subwavelength structures and the like.
  • the optically variable security features are generally provided by an embossed lacquer, for example a UV embossed lacquer, with microstructures embossed therein and a metallization that is present at least in some areas.
  • additional layers for example protective lacquers or primers, which are then followed by the heat-sealing lacquer at the end.
  • the heat-sealing lacquer layer can actually also consist of several layers of different lacquers.
  • the functional layers have only weak adhesion to the carrier film, which can be achieved, for example, by poor adhesion of the embossing lacquer to the carrier film or by introducing a special separating layer.
  • a perforated mask is applied to the above-mentioned transfer film structure.
  • the perforated mask can in particular be provided by a perforated film from which the shapes of the desired patches are punched out.
  • a perforated film is advantageously laminated or glued onto the transfer film structure. This can be done with a laminating adhesive or simply by using the adhesive strength of the heat seal lacquer that is already present.
  • the side facing the heat-sealing lacquer can be provided beforehand with a primer which enables the perforated film and functional layers to be bonded better. Perforated film and functional layers can also only be glued in areas.
  • the perforated film can only stick to the functional layers when the heat-sealing lacquer is melted on during application. In practice, however, it is advantageous to prevent the perforated film from slipping by gluing at least in certain areas.
  • the patch is heated as usual, the heat-sealing lacquer melting on and adhering to the (value document) substrate.
  • the (value document) substrate can be, for example, a paper or polymer substrate or a paper / polymer composite substrate.
  • the heating can take place in certain areas (i.e. in an area that is slightly larger than the patch itself) or over the entire surface. If the film structure is then separated from the (value document) substrate, the functional layers remain in the patch area on the (value document) substrate, since the heat seal lacquer to the paper ensures stronger adhesion than the adhesion between the carrier film and the functional layers. The functional layers remain on the carrier film in the area outside the patch.
  • Micromirrors, hologram structures, subwavelength structures or (for example embedded) microlenses, for example, can be incorporated in the functional layers.
  • Microlenses can in particular be present in combination with microimages formed in a separate plane and in this way generate optically variable security features in the form of so-called moiré magnifiers, modulo mappers, tilt images and the like.
  • Security features based on microlenses in combination with microimages are, for example, from the WO 2006/087138 A1 known.
  • Micromirrors, hologram structures, etc. are usually coated with a metallization that is present at least in some areas, which can consist of a metal, e.g. Al or Ag, a high-index coating, e.g. ZnS or TiO 2 , or a color-changing three-layer reflector / dielectric / absorber system (e.g. a Al / SiO2 / Cr structure).
  • a metal e.g. Al or Ag
  • a high-index coating e.g. ZnS or TiO 2
  • a color-changing three-layer reflector / dielectric / absorber system e.g. a Al / SiO2 / Cr structure
  • the heat-sealing gel lacquer It is essential for the heat-sealing gel lacquer that at the end of the application it ensures the desired adhesion through pressure and possibly increased temperature.
  • the heat can melt it and / or activate it.
  • the perforated film is preferably as thin as possible. Films with thicknesses in a range from 4.5 ⁇ m to 19 ⁇ m can be used with advantage.
  • a polyethylene terephthalate (PET) film is preferably used as the film.
  • Thicker films, for example a 19 ⁇ m thick PET film, are preferably used as carrier films. In the embodiments in which the functional layers are punched into by means of punching, something is generally also punched into the carrier film. It must be ensured here that the carrier film does not tear after the patch has been applied to the (value document) substrate.
  • a laminating composite consisting of two films, as is the case with the WO 2010/031543 A1 is known (e.g. a 12 ⁇ m thick film and a 19 ⁇ m thick film that are glued together): then only one of the two films is punched out during punching, while the second film remains undamaged.
  • a single punched film tears more easily than a laminated composite, since the "tear" of a film requires more force than tearing it further.
  • embossed structure that can be used according to the invention is in particular embossed into an embossed lacquer.
  • optically variable effect includes not only holograms but also hologram-like diffraction structures, that is to say, for example, structures that do not produce a defined image but rather a blurred colored impression.
  • optical variable effect also subsumes diffraction patterns, structures with a color shift effect, cinema forms, structures with a microlens effect, structures with isotropic or anisotropic scattering effects or with other interference effects, sub-wavelength structures, moth-eye structures, microlens structures and microstructures for moire magnifiers or modulo mappers , Micromirror structures and microprismatic structures.
  • the multilayer structure capable of interference when viewing the front side in reflected light and a second appearance of the multilayer structure capable of interference when viewing the front side in transmitted light, e.g. by means of cutouts in the reflective layer and / or the semitransparent layer Layer.
  • a film security element with different reflected-light / transmitted-light appearances is from WO 2009/149831 A2 known.
  • the semitransparent layer can have a multiplicity of cutouts arranged in a grid-like manner, which in their entirety result in a character, an image or a pattern. The pattern created in this way is visible in incident light and disappears in transmitted light.
  • a different reflected-light / transmitted-light appearance of the multilayer structure can be achieved by combining the structure with a relief structure, in particular a diffractive relief structure, a micro-optical relief structure or a sublambda structure.
  • Further preferred reflective embossed structures contain, for example, a liquid crystal layer which shows a different color when viewed in incident light than when viewed in transmitted light.
  • a different reflected-light / transmitted-light appearance can be achieved by combining the liquid crystal layer with a relief structure, in particular a diffractive relief structure, a micro-optical relief structure or a sublambda structure.
  • Further preferred reflective embossed structures contain, for example, a printed layer with an effect pigment composition which when viewed in reflected light shows a different color than when viewed in transmitted light, in particular a gold / blue color change, a gold / violet color change, a green-gold / Magenta color change, a purple / green color change or a silver / opaque color change.
  • Such printing inks are, for example, in the WO 2011/064162 A2 described.
  • a different reflected-light / transmitted-light appearance can be achieved by combining the printing layer with a relief structure, in particular a diffractive relief structure, a micro-optical relief structure or a sublambda structure.
  • the relief structure forming a diffractive structure is in particular a hologram structure.
  • the dimensions of the structural elements of the diffractive structure are preferably in the order of magnitude of the light wavelength, more preferably in a range that is greater than 100 nm and less than 1 ⁇ m, a range greater than 300 nm and less than 1 ⁇ m being particularly preferred.
  • the relief structure forming a micromirror arrangement is also referred to herein as a micro-optical relief structure.
  • the production of a micro-optical relief structure is known in the prior art (see e.g. WO 2014/060089 A2 ).
  • the dimensions of the structural elements of the micromirror arrangement are preferably in a range that is greater than 1 ⁇ m and less than 40 ⁇ m, a range greater than 1 ⁇ m and less than 30 ⁇ m being particularly preferred.
  • the dimensions of the structural elements of the micromirror arrangement have, for example, one Height up to 15 ⁇ m and a lateral extension up to 30 ⁇ m. Both the height and the lateral extent of the structural elements of the micromirror arrangement are preferably greater than 1 ⁇ m.
  • the reflective microstructure has the form of a mosaic made up of a large number of reflective mosaic elements, which are characterized by the parameters size, outline shape, relief shape, reflectivity and spatial orientation and which form a predetermined motif by different groups of mosaic elements with different characteristic parameters incident light in reflect different spatial areas, and in which the mosaic elements have a lateral dimension below the resolution limit of the eye.
  • Figures 1 and 2 illustrate the production of a transfer material according to the invention according to a first embodiment.
  • a transfer film structure is provided.
  • the transfer film structure is based on a carrier film 1, one or more functional layers 2 located thereon and a heat-sealing lacquer layer 3.
  • the functional layers 2 provide optically variable security features, for example embossed holograms, micromirror elements, subwavelength structures and the like.
  • the optically variable security features are generally provided by an embossed lacquer, for example a UV embossed lacquer, with microstructures embossed therein and a metallization that is present at least in some areas.
  • the functional layers 2 have only weak adhesion to the carrier film 1, which can be achieved, for example, by poor adhesion of the embossing lacquer to the carrier film 1 or by introducing a special separating layer.
  • a perforated mask 4 is applied to the transfer film structure shown.
  • the perforated mask 4 can in particular be provided by a perforated film from which the shapes of the desired patches are punched out.
  • Such a perforated film 4 is advantageously laminated onto the transfer film structure. This can be done with a additional laminating adhesive (in the Figure 2 not shown) or simply by using the adhesive strength of the heat-sealing lacquer 3 which is already present.
  • the side facing the heat-sealing lacquer 3 can advantageously be provided beforehand with a primer which enables the perforated film 4 and functional layers 2 to be better bonded.
  • Perforated film 4 and functional layers 2 can also only be glued in areas.
  • Figures 3 and 4 illustrate the application of a transfer patch according to the first embodiment to a value document substrate, in the present example a security paper for the production of banknotes.
  • the patch is heated as usual, the heat-sealing lacquer 3 melting on and glued to the paper substrate 5 (see FIG Figure 3 ).
  • the heating can take place in areas (ie in an area that is slightly larger than the patch itself) or over the entire area.
  • the film structure 6 is then separated from the paper substrate 5.
  • the functional layers 2 remain in the patch area on the paper substrate 5, since the heat-sealing lacquer 3 to the paper 5 ensures stronger adhesion than the adhesion between carrier film 1 and functional layers 2.
  • the functional layers 2 remain on the carrier film 1 outside the patch.
  • Figures 5 to 8 illustrate the production of a transfer material according to the invention according to a second embodiment.
  • a transfer film structure is provided.
  • the transfer film structure is based on a carrier film 7, one or more functional layers 8 thereon and a heat-sealing lacquer layer 9.
  • the functional layers 8 provide optically variable security features, for example embossed holograms, micromirror elements, subwavelength structures and the like.
  • the optically variable security features are generally provided by an embossed lacquer, for example a UV embossed lacquer, with microstructures embossed therein and a metallization that is present at least in some areas.
  • the functional layers 8 have only weak adhesion to the carrier film 7, which can be achieved, for example, by poor adhesion of the embossing lacquer to the carrier film 7 or by introducing a special separating layer.
  • the transfer composite shown is provided with a lamination adhesive 10 in the areas outside of the later patch (the lamination adhesive 10 is not absolutely necessary; alternatively, the already existing heat-sealing lacquer 9 could be melted or activated in areas) and then glued with a film 11. Due to the positioning tolerances of the gluing and die cut, it is advantageous to let the gluing end at a sufficient distance from the patch.
  • the patch shapes are then punched out (the solid lines 12 illustrate the punching tool) and the film 11 is removed in the areas of the holes, for example by means of compressed air or by pulling over a sharp edge.
  • a major advantage of this variant is that the patches do not have to be torn out of the functional layer assembly after application to the value document substrate (i.e. a break within the functional layers must occur), but the functional layers at the edge of the patch are already cleanly cut through by punching (see those in the Figure 8 Punched lines shown in dashed lines 13). This results in very clean patch edges.
  • Figures 9 and 10 illustrate the application of the transfer patch according to the second embodiment to a value document substrate, in the present example a security paper for the production of banknotes.
  • the patch is heated as usual, the heat-sealing lacquer 9 melting on and glued to the paper substrate 14 (see FIG Figure 9 ).
  • the heating can take place in areas (ie in an area that is slightly larger than the patch itself) or over the entire area.
  • the film structure 15 is then separated from the paper substrate 14.
  • the functional layers 8 remain in the patch area on the paper substrate 14, since the heat-sealing lacquer 9 to the paper 14 ensures stronger adhesion than the adhesion between carrier film 7 and functional layers 8.
  • the functional layers 8 remain on the carrier film 7 outside the patch.

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Claims (10)

  1. Matériau de transfert pour élément de sécurité, comprenant
    - un composite de couches pour élément de sécurité, ayant une pluralité de couches à laquelle appartiennent au moins une couche caractéristique (2, 8) déployant un effet optiquement variable et une couche de colle (3, 9), cependant que la couche caractéristique est la couche qui, après une transposition d'un élément de sécurité sur un substrat pour document de valeur, est tournée vers un observateur ; et
    - un substrat porteur (1, 7) joint de manière séparable à la couche caractéristique (2, 8) du composite de couches pour élément de sécurité ;
    caractérisée en ce que le matériau de transfert pour élément de sécurité comprend en outre :
    - une couche de masquage (4, 11) comprenant au moins un évidement, laquelle est telle que le composite de couches pour élément de sécurité, dans la zone du au moins un évidement de la couche de masquage (4, 11), par l'effet de pression et éventuellement de chaleur, peut être collé avec le substrat pour document de valeur (5, 14) au moyen de la couche de colle (3, 9) et ensuite détaché du substrat porteur (1, 7), cependant que, dans la zone à l'extérieur du au moins un évidement de la couche de masquage (4, 11), un collage du composite de couches pour élément de sécurité avec le substrat pour document de valeur (5, 14) et un détachement subséquent du composite de couches pour élément de sécurité du substrat porteur (1, 7) est empêché.
  2. Matériau de transfert pour élément de sécurité selon la revendication 1, cependant que la couche de masquage (4, 11) est constituée par une feuille.
  3. Matériau de transfert pour élément de sécurité selon la revendication 1 ou 2, cependant que la couche caractéristique (2, 8) déployant un effet optiquement variable repose sur une structure gaufrée réfléchissante.
  4. Matériau de transfert pour élément de sécurité selon la revendication 3, cependant que la structure gaufrée réfléchissante est telle que suit : (a) une structure diffractive réfléchissante ou (b) une microstructure réfléchissante sous forme d'une mosaïque en une pluralité d'éléments de mosaïque réfléchissants qui sont caractérisés par les paramètres taille, forme de contours, forme de relief, réflectivité et orientation spatiale et qui constituent un motif prédéterminé, ce qui a lieu en ce que différents groupes d'éléments de mosaïque ayant différents paramètres caractéristiques réfléchissent de la lumière incidente dans différentes zone spatiales, et dans lequel les éléments de mosaïque ont une dimension latérale en-dessous de la limite de résolution de l'œil humain.
  5. Matériau de transfert pour élément de sécurité selon la revendication 3 ou 4, cependant que la structure gaufrée réfléchissante (i) comporte comme couches de réflexion des couches opaques de métal, ou comporte (ii) comme couches de réflexion des couches transparentes à indice de réfraction élevé, ou comporte (iii) comme couches de réflexion des éléments en couche mince à effet de changement des couleurs par basculement, en particulier avec une couche réfléchissante et une couche semi-transparente et une couche diélectrique agencée entre elles, ou comporte (iv) comme couches de réflexion des couches en matériau cristaux liquides, en particulier en matériau cristaux liquides cholestérique, ou comporte (v) comme couches de réflexion des couches imprimées sur la base de compositions de pigments à effets à effet dépendant de l'angle d'observation ou à couleurs différentes lors d'une observation en lumière incidente et lors d'une observation en lumière transmise, ou comporte (vi) comme couches de réflexion la disposition multicouche suivante : deux couches semi-transparentes et une couche diélectrique agencée entre les deux couches semi-transparentes, cependant que la disposition multicouche présente, lors d'une observation en lumière incidente d'une part, et lors d'une observation en lumière transmise d'autre part, différentes teintes.
  6. Procédé de fabrication d'un matériau de transfert pour élément de sécurité selon une des revendications de 1 à 5, comprenant
    a) la mise à disposition d'un substrat porteur (1, 7)
    b) le placement, sur le substrat porteur (1, 7), d'un composite de couches pour élément de sécurité ayant une pluralité de couches à laquelle appartiennent au moins une couche caractéristique (2, 8) déployant un effet optiquement variable et une couche de colle (3, 9), cependant que la couche caractéristique (2, 8) est la couche qui, après une transposition d'un élément de sécurité sur un substrat pour document de valeur, est tournée vers un observateur, cependant que le substrat porteur (1, 7) est joint de manière séparable à la couche caractéristique (2, 8) du composite de couches pour élément de sécurité ;
    c) la mise à disposition distincte d'une couche de masquage (4, 11) comprenant au moins un évidement ;
    d) le collage de la couche de masquage avec le composite de couches pour élément de sécurité obtenu à l'étape b), de telle sorte qu'un matériau de transfert pour élément de sécurité est obtenu, dans lequel le composite de couches pour élément de sécurité, dans la zone du au moins un évidement de la couche de masquage (4, 11), par l'effet de pression et éventuellement de chaleur, peut être collé avec un substrat pour document de valeur au moyen de la couche de colle (3, 9) et ensuite détaché du substrat porteur (1, 7), cependant que, dans la zone à l'extérieur du au moins un un évidement de la couche de masquage (4, 11), un collage du composite de couches pour élément de sécurité avec le substrat pour document de valeur et un détachement subséquent du composite de couches pour élément de sécurité du substrat porteur (1, 7) est empêché.
  7. Procédé de fabrication d'un matériau de transfert pour élément de sécurité selon une des revendications de 1 à 5, comprenant
    a) la mise à disposition d'un substrat porteur (1, 7)
    b) le placement, sur le substrat porteur (1, 7), d'un composite de couches pour élément de sécurité ayant une pluralité de couches à laquelle appartiennent au moins une couche caractéristique (2, 8) déployant un effet optiquement variable et une couche de colle (3, 9), cependant que la couche caractéristique (2, 8) est la couche qui, après une transposition d'un élément de sécurité sur un substrat pour document de valeur, est tournée vers un observateur, cependant que le substrat porteur est joint de manière séparable à la couche caractéristique (2, 8) du composite de couches pour élément de sécurité ;
    c) l'application d'une feuille adaptée à la génération d'une couche de masquage (4, 11) comportant au moins un évidement sur le composite de couches pour élément de sécurité obtenu à l'étape b), cependant que la feuille est collée au composite de couches pour élément de sécurité seulement dans la zone à l'extérieur du au moins un évidement à générer et n'est pas collée au composite de couches pour élément de sécurité dans la zone du au moins un évidement à générer ;
    d) la génération d'au moins un évidement dans la feuille obtenue à l'étape c) afin de, de cette façon, générer une couche de masquage (4, 11), de telle sorte qu'un matériau de transfert pour élément de sécurité est obtenu, dans lequel le composite de couches pour élément de sécurité, dans la zone du au moins un évidement de la couche de masquage (4, 11), par l'effet de pression et éventuellement de chaleur, peut être collé avec un substrat pour document de valeur au moyen de la couche de colle (3, 9) et ensuite détaché du substrat porteur (1, 7), cependant que, dans la zone à l'extérieur du au moins un évidement de la couche de masquage (4, 11), un collage du composite de couches pour élément de sécurité avec le substrat pour document de valeur (5, 14) et un détachement subséquent du composite de couches pour élément de sécurité du substrat porteur (1, 7) est empêché.
  8. Procédé selon la revendication 7, cependant que, à l'étape d), la génération d'au moins un évidement dans la feuille obtenue à l'étape c) a lieu par découpe, et que le matériau de feuille découpé est enlevé.
  9. Procédé selon la revendication 8, cependant que, à l'étape de la découpe, non seulement la feuille à faire insérer dans une couche de masquage (4, 11) est pourvue de lignes de découpe, mais aussi le composite de couches pour élément de sécurité à transférer est pourvu de lignes de découpe.
  10. Procédé de fabrication d'un matériau de transfert pour élément de sécurité selon une des revendications de 1 à 5, comprenant
    a) la mise à disposition d'un substrat porteur (1, 7)
    b) le placement, sur le substrat porteur (1, 7), d'un composite de couches pour élément de sécurité ayant une pluralité de couches à laquelle appartiennent au moins une couche caractéristique (2, 8) déployant un effet optiquement variable et une couche de colle (3, 9), cependant que la couche caractéristique (2, 8) est la couche qui, après une transposition d'un élément de sécurité sur un substrat pour document de valeur, est tournée vers un observateur, cependant que le substrat porteur est joint de manière séparable à la couche caractéristique (2, 8) du composite de couches pour élément de sécurité ;
    c) le placement, sur le composite de couches pour élément de sécurité obtenu à l'étape b), d'une couche de masquage (4, 11) comportant au moins un évidement, cependant que la couche de masquage (4, 11) est générée par impression au moyen d'un vernis, de telle sorte qu'un matériau de transfert pour élément de sécurité est obtenu, dans lequel le composite de couches pour élément de sécurité, dans la zone du au moins un évidement de la couche de masquage (4, 11), par l'effet de pression et éventuellement de chaleur, peut être collé avec un substrat pour document de valeur au moyen de la couche de colle (3, 9) et ensuite détaché du substrat porteur (1, 7), cependant que, dans la zone à l'extérieur du au moins un évidement de la couche de masquage (4, 11), un collage du composite de couches pour élément de sécurité avec le substrat pour document de valeur et un détachement subséquent du composite de couches pour élément de sécurité du substrat porteur (1, 7) est empêché.
EP18000151.3A 2017-02-17 2018-02-15 Matériau de transfert d'éléments de sécurité et son procédé de fabrication Active EP3363652B2 (fr)

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DE102019006255A1 (de) * 2019-09-04 2021-03-04 Giesecke+Devrient Currency Technology Gmbh Gegen Spaltung geschütztes Sicherheitspapier und Wertdokument
CN114556460B (zh) * 2019-10-23 2024-05-28 日本瑞翁株式会社 液晶固化层转印贴签、液晶固化层转印物、以及液晶固化层转印贴签的真实性判定方法
DE102019008642A1 (de) * 2019-12-13 2021-06-17 Giesecke+Devrient Currency Technology Gmbh Verfahren zur Herstellung von plättchenförmigen Effektpigmenten

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EP1940618B1 (fr) 2005-10-27 2016-08-17 OVD Kinegram AG Procede de transfert d'un corps multicouche et feuille de transfert
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