WO2005043254A1 - Method of personalizing metallic holographic layers applicable on substrates - Google Patents

Method of personalizing metallic holographic layers applicable on substrates Download PDF

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Publication number
WO2005043254A1
WO2005043254A1 PCT/IT2003/000701 IT0300701W WO2005043254A1 WO 2005043254 A1 WO2005043254 A1 WO 2005043254A1 IT 0300701 W IT0300701 W IT 0300701W WO 2005043254 A1 WO2005043254 A1 WO 2005043254A1
Authority
WO
WIPO (PCT)
Prior art keywords
layer
metallic
writable
microns
adhesive
Prior art date
Application number
PCT/IT2003/000701
Other languages
French (fr)
Inventor
Leo Vermeulen
Dino Radice
Luca Radice
Original Assignee
Centro Grafico Dg S.P.A.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Centro Grafico Dg S.P.A. filed Critical Centro Grafico Dg S.P.A.
Priority to PCT/IT2003/000701 priority Critical patent/WO2005043254A1/en
Priority to AU2003283822A priority patent/AU2003283822A1/en
Publication of WO2005043254A1 publication Critical patent/WO2005043254A1/en

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Classifications

    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/04—Processes or apparatus for producing holograms
    • G03H1/18—Particular processing of hologram record carriers, e.g. for obtaining blazed 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
    • B42D25/328—Diffraction gratings; Holograms
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H1/00—Holographic processes or apparatus using light, infrared or ultraviolet waves for obtaining holograms or for obtaining an image from them; Details peculiar thereto
    • G03H1/02—Details of features involved during the holographic process; Replication of holograms without interference recording
    • G03H1/0252—Laminate comprising a hologram layer
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03H—HOLOGRAPHIC PROCESSES OR APPARATUS
    • G03H2250/00—Laminate comprising a hologram layer
    • G03H2250/12—Special arrangement of layers

Definitions

  • the present invention relates to a method of personalizing, by means of digital data, metallic holographic layers applied on paper, plastics substrates, glass, metal, wood, cotton etc., in correlation with the rest of the digital information printed in other areas of the document itself (data or pictures) .
  • the present invention aims to improve the level of security of documents to which it is applied, to provide for a method of productions that offers optimum versatility and to allow for personalization / securizing of the final document product. Moreover, the present invention provides for a method that renders impossible the falsification of personalized data. More specifically, the first level of security is improved: th ⁇ s means that somebody can verify visually and without any checking tool if the document and/o_r the product is genuine or not .
  • the method can be applied in particular to various substrates in the form of: ID cards, passports, D.L., visas, social cards, money or credit cards and all kind of documents or products that are subject to
  • the metallic holographic layers which can be personalized by means of a laser source, can be
  • the present invention comprises also a metallic
  • FIG. 1 shows a schematic representation of one o£ the preferred embodiments of the present invention
  • FIG. 2 shows a schematic example of a substrate on which the layer of the embodiment of figure 1 is applied;
  • FIG. 3 shows a schematic representation of a second preferred embodiment of the present invention
  • FIG. 4 shows a schematic representation of a third preferred embodiment of the present invention.
  • FIG. 5 shows an example of a holographic grating according to the present invention in which its maximum reflection intensity is seen at a certain angles from the vertical or from the horizontal of the document's surface to be protected.
  • metallic layer is transferred onto the substrate (paper used for money, checks, shares, certificates, plastics like pvc, ABS, pet, polycarbonate, photographic layers, ink-jet layers, glass, gelatin layers, wood, cotton) to protect by means of hot stamping transferring process.
  • substrate paper used for money, checks, shares, certificates, plastics like pvc, ABS, pet, polycarbonate, photographic layers, ink-jet layers, glass, gelatin layers, wood, cotton
  • the metallic writeable foil 10 is transferred onto the document's surface by a process of hot stamping, by means of a heated die or rubber die.
  • the writeable foil 10 is composed by the following layer structure: Layer 1, is a film carrier, namely a PET or pp, ' pvc, polycarbonate film (film carrier afterwards) , with thickness between 6 and 100, but preferably 19 microns or 23 microns.
  • Layer 2 is the releasing layer, with thickness from 0,001 to 2 microns, but typically 0,1 microns.
  • the releasing layer is composed of thermoplastic polymers that melt above the temperature of 80°C, releasing off the remaining layers from 3 to 5.
  • the releasing layer is between the film carrier layer 1 and the holographic grating layer 3, the latter being subsequently described.
  • Layer 3 is a layer with holographic grating recorded microstructure .
  • Layer 3 is composed by polymers that have a Tg above 150°C, with thickness ranging between 0,2 - 3 microns, but typically 0,6 - 0,7 microns.
  • the layer 3 has recorded on it, by means of mechanical embossing process, the holographic grating microstructure.
  • Layer 4 is a metallic layer.
  • the total thickness of the metallic layer 4 can vary from 10 to 2000 angstrom, depending on the type of metal layer (typically 400 for aluminium) .
  • Layer 5 is an irreversible heat activated adhesive.
  • the adhesive layer 5 is composed by polymers that have a thickness variable from 1 micron for plastic non porous substrates to 20 microns, depending on the substrate.
  • the adhesive is characterized by a Tg between 30 and 100°C but preferably 50°C.
  • the metallic writable foil 10 normally in roll format, is positioned under the heated die or roller (metallic or plastic type) ; the heated die or roller is brought into contact with the foil from the film carrier side, being applied also a pressure that forces the foil 10 to be in contact, with the adhesive layer 5, with the document/substrate surface.
  • the heat is then transferred through the layers from 1 to 5, activating the adhesive. All the layers from 2 to 5 are transferred onto the document/substrate where pressure and heat have been applied.
  • Figure 2 shows a schematic example of a substrate 11 on which the layer 13 of the embodiment of figure 1 is applied, while on area 12 digital printed variable data can be applied.
  • the area 12 is the area in which the writable metallic foil is transferred by means of hot stamping: the area 12 can also cover the entire document to protect .
  • a second embodiment of the present invention provides for the fact that the metallic layer is transferred onto the substrate to protect in a form of a sticker, namely a self adhesive label.
  • the writable foil 20 is composed by the following layer structure:
  • Layer 21 is the film carrier, of which various thicknesses are possible, from 6 to 150 microns.
  • Layer 22 is a layer with holographic grating recorded microstructure. This layer is composed by thermoplastic polymers that have a Tg above 100 but preferably 150°C, with thickness ranging between 0,2 - 3 microns, but tipically 0,6 - 0,7 microns.
  • Layer 22 has recorded, by means of mechanical embossing process, the holographic grating microstructure.
  • Layer 23 is a metallic layer.
  • the total thickness of the metallic layer 23 can vary form 10 to 2000 angstrom, depending on the type of metal layer (typically 400 for aluminium) .
  • Layer 24 is a pressure sensitive adhesive liner and layer 25 is a protection backing liner.
  • the stickers, in a roll form or in sheets, are removed from the backing liner 25 and applied on the documents/substrates to be protected. This can be done manually or by the use of automatic label application machines.
  • a third embodiment of the present invention provides for the fact that metallic layer is transferred onto the substrate to protect in a form of a laminate (film carrier + heat activated adhesive or wet gluing
  • the writable foil 30 is composed by the following layer structure :
  • Layer 31 is a plastic film carrier (pet, pp, pvc, petg, pc etc.) of various thicknesses possible from 6 to 175 microns, but preferably 23 microns.
  • Layer 32 is a layer with holographic grating recorded microstructure .
  • Layer 32 is composed by polymers that have a Tg above 100°C but preferably 150°C, with thickness ranging between 0,2 - 3, but typically 0,6 - 0,7 microns.
  • the layer has recorded, by means of mechanical embossing process, the holographic grating microstructure.
  • Layer 33 is a metallic layer. The total thickness of the metallic layer can vary from 10 to 2000 angstrom, depending on the type of metal layer (typically 400 for aluminium) .
  • Layer 34 can be a heat-activated adhesive, that, depending on the polymer type (normally PE, EVA copolymers, PVC) , can be applied by means of extrusion coating technique and after melted with heat and welded with the substrate of destination; layer 34 can be also be a 2K wet glue applied between layer 33 and the document/substrate. The thickness of this layer can vary from 20 to 150 (preferably 50) microns . Layer 34 is positioned under the metallic layer 33.
  • the metallic writable foil 30, normally in label format, is positioned under the heated die or roller (metallic or plastic type) : the heated die or roller is brought into contact with the foil from the carrier side, being applied also a pressure that forces the foil to be in contact with the adhesive layer with the document surface. The heat is then transferred through the layers (from 31 to 34) , activating the adhesive. The foil is welded with trie document.
  • the laminate can be applied to the document surface also gluing them together by means of two-components wet polyurethane glue .
  • the digital personalization process of the metallic layer can take place before or after the layer has been applied onto the document.
  • All the standard printed variable data and picture can be printed, in the correspondent area by mean of toner printing system, ink jet system, D2T2 (dye diffusion thermal transfer) , photographical techniques, wax printing (TTR ribbons) or laser engraving.
  • the laser beam passing trough all the top layers removes the metallic area where it is focalised .
  • the laser can remove the metallic layer in the areas interested reproducing digitally variable data (images or writings or combination of both) .
  • pictures and/or the name of the person who the document belongs to can be reproduced either in a positive or in negative mode.
  • the metallic layer can be composed by opaque metals such as aluminium, bismuth, copper or by a transparent layer (such as ZnS, ZrS, SiOx, TiOx, ) or by a multilayer mixed construction of the above materials.
  • the total thickness of the metallic layer can vary from 20 to 1000 angstrom.
  • the pattern of the hologram giving the best results are continuous and uniform gratings like rainbow patterns or even reflecting areas, best reflecting at different angles by rotating vertically or horizontally, but of course any type of pattern can be used.
  • This type of proposed hologram can be combined with any type of computer originated holograms (such as kinegram, exelgram, movigram, Swissgram) and/or traditional reflection/transmittance holograms or a combination of the techniques.
  • any type of computer originated holograms such as kinegram, exelgram, movigram, Swissgram
  • traditional reflection/transmittance holograms or a combination of the techniques.
  • Holographic grating can also be constructed in the way that its maximum reflection intensity is seen at a certain angles from the vertical or from the horizontal of the document's surface to be protected: for instance between 45°and 90° vertically, as shown schematically in Figure 5. So normally when looking at the document the observer does not see the holographic grating looking at it from the vertical, but the document has to be turned around its axis of at least 45°.

Abstract

Method of personalizing metallic holographic layers (10, 20, 30) applicable on substrates (11) comprising the steps of transferring onto said substrate by means of an appropriate transferring process a writeable foil comprised at least by a first layer (1, 21, 31)composed of a film carrier, a second layer (3, 22, 32) with a holographic grating recorded microstructure, a third layer (4, 23, 33) composed by a metallic layer and at least a suitable adhesive layer (5, 24, 33), wherein a digital personalization phase of the metallic layer is provided for printing data and/or pictures in the correspondent area by memorizing metallic areas and a step of digital personalization acting on said metallic writable layer by means of at least a laser beam is also provided. The present invention comprises also a metallic writable layer product applicable on substrates.

Description

"Method of personalizing metallic holographic layers applicable on substrates" * * * *
FIELD OF THE INVENTION The present invention relates to a method of personalizing, by means of digital data, metallic holographic layers applied on paper, plastics substrates, glass, metal, wood, cotton etc., in correlation with the rest of the digital information printed in other areas of the document itself (data or pictures) .
The present invention aims to improve the level of security of documents to which it is applied, to provide for a method of productions that offers optimum versatility and to allow for personalization / securizing of the final document product. Moreover, the present invention provides for a method that renders impossible the falsification of personalized data. More specifically, the first level of security is improved: th±s means that somebody can verify visually and without any checking tool if the document and/o_r the product is genuine or not . The method can be applied in particular to various substrates in the form of: ID cards, passports, D.L., visas, social cards, money or credit cards and all kind of documents or products that are subject to
forgery attempts.
The metallic holographic layers, which can be personalized by means of a laser source, can be
applied as self-adhesive sticker, as a laminated overall layer or as a hot stamping transfer layer.
After the laser exposure the photo and/or name/ox data of the person or product will be visualized as a
personalized hologram and of course due to the fact that the metallic layer is destroyed modifications o_r falsifications of the holographic personalized area
is impossible.
Said purposes are achieved, according to the present invention, by a method of personalizing metallic holographic layers applicable on substrates according to the appended claims.
The present invention comprises also a metallic
writable layer product applicable on substrates. DESCRIPTION OF THE DRAWINGS
- Figure 1 shows a schematic representation of one o£ the preferred embodiments of the present invention;
- Figure 2 shows a schematic example of a substrate on which the layer of the embodiment of figure 1 is applied; - Figure 3 shows a schematic representation of a second preferred embodiment of the present invention;
- Figure 4 shows a schematic representation of a third preferred embodiment of the present invention; and
- Figure 5 shows an example of a holographic grating according to the present invention in which its maximum reflection intensity is seen at a certain angles from the vertical or from the horizontal of the document's surface to be protected. DETAILED DESCRIPTION
We now describe a first preferred embodiment of the invention, whereby the component layers are globally identified in Figure 1 by the reference numeral 10. In this first case metallic layer is transferred onto the substrate (paper used for money, checks, shares, certificates, plastics like pvc, ABS, pet, polycarbonate, photographic layers, ink-jet layers, glass, gelatin layers, wood, cotton) to protect by means of hot stamping transferring process.
The metallic writeable foil 10 is transferred onto the document's surface by a process of hot stamping, by means of a heated die or rubber die. The writeable foil 10 is composed by the following layer structure: Layer 1, is a film carrier, namely a PET or pp,' pvc, polycarbonate film (film carrier afterwards) , with thickness between 6 and 100, but preferably 19 microns or 23 microns.
Layer 2 is the releasing layer, with thickness from 0,001 to 2 microns, but typically 0,1 microns. The releasing layer is composed of thermoplastic polymers that melt above the temperature of 80°C, releasing off the remaining layers from 3 to 5.
The releasing layer is between the film carrier layer 1 and the holographic grating layer 3, the latter being subsequently described.
Layer 3 is a layer with holographic grating recorded microstructure .
Layer 3 is composed by polymers that have a Tg above 150°C, with thickness ranging between 0,2 - 3 microns, but typically 0,6 - 0,7 microns. The layer 3 has recorded on it, by means of mechanical embossing process, the holographic grating microstructure.
Layer 4 is a metallic layer. The total thickness of the metallic layer 4 can vary from 10 to 2000 angstrom, depending on the type of metal layer (typically 400 for aluminium) .
Layer 5 is an irreversible heat activated adhesive.
The adhesive layer 5 is composed by polymers that have a thickness variable from 1 micron for plastic non porous substrates to 20 microns, depending on the substrate. The adhesive is characterized by a Tg between 30 and 100°C but preferably 50°C. In the first embodiment of the method of the present invention, the metallic writable foil 10, normally in roll format, is positioned under the heated die or roller (metallic or plastic type) ; the heated die or roller is brought into contact with the foil from the film carrier side, being applied also a pressure that forces the foil 10 to be in contact, with the adhesive layer 5, with the document/substrate surface. The heat is then transferred through the layers from 1 to 5, activating the adhesive. All the layers from 2 to 5 are transferred onto the document/substrate where pressure and heat have been applied.
Figure 2 shows a schematic example of a substrate 11 on which the layer 13 of the embodiment of figure 1 is applied, while on area 12 digital printed variable data can be applied.
The area 12 is the area in which the writable metallic foil is transferred by means of hot stamping: the area 12 can also cover the entire document to protect . A second embodiment of the present invention provides for the fact that the metallic layer is transferred onto the substrate to protect in a form of a sticker, namely a self adhesive label. The writable foil 20 is composed by the following layer structure: Layer 21 is the film carrier, of which various thicknesses are possible, from 6 to 150 microns. Layer 22 is a layer with holographic grating recorded microstructure. This layer is composed by thermoplastic polymers that have a Tg above 100 but preferably 150°C, with thickness ranging between 0,2 - 3 microns, but tipically 0,6 - 0,7 microns. Layer 22 has recorded, by means of mechanical embossing process, the holographic grating microstructure. Layer 23 is a metallic layer. The total thickness of the metallic layer 23 can vary form 10 to 2000 angstrom, depending on the type of metal layer (typically 400 for aluminium) .
Layer 24 is a pressure sensitive adhesive liner and layer 25 is a protection backing liner. The stickers, in a roll form or in sheets, are removed from the backing liner 25 and applied on the documents/substrates to be protected. This can be done manually or by the use of automatic label application machines. A third embodiment of the present invention provides for the fact that metallic layer is transferred onto the substrate to protect in a form of a laminate (film carrier + heat activated adhesive or wet gluing
layer ) . The writable foil 30 is composed by the following layer structure :
Layer 31 is a plastic film carrier (pet, pp, pvc, petg, pc etc.) of various thicknesses possible from 6 to 175 microns, but preferably 23 microns. Layer 32 is a layer with holographic grating recorded microstructure .
Layer 32 is composed by polymers that have a Tg above 100°C but preferably 150°C, with thickness ranging between 0,2 - 3, but typically 0,6 - 0,7 microns. The layer has recorded, by means of mechanical embossing process, the holographic grating microstructure. Layer 33 is a metallic layer. The total thickness of the metallic layer can vary from 10 to 2000 angstrom, depending on the type of metal layer (typically 400 for aluminium) .
Layer 34 can be a heat-activated adhesive, that, depending on the polymer type (normally PE, EVA copolymers, PVC) , can be applied by means of extrusion coating technique and after melted with heat and welded with the substrate of destination; layer 34 can be also be a 2K wet glue applied between layer 33 and the document/substrate. The thickness of this layer can vary from 20 to 150 (preferably 50) microns . Layer 34 is positioned under the metallic layer 33.
The metallic writable foil 30, normally in label format, is positioned under the heated die or roller (metallic or plastic type) : the heated die or roller is brought into contact with the foil from the carrier side, being applied also a pressure that forces the foil to be in contact with the adhesive layer with the document surface. The heat is then transferred through the layers (from 31 to 34) , activating the adhesive. The foil is welded with trie document.
The laminate can be applied to the document surface also gluing them together by means of two-components wet polyurethane glue . The digital personalization process of the metallic layer can take place before or after the layer has been applied onto the document.
All the standard printed variable data and picture can be printed, in the correspondent area by mean of toner printing system, ink jet system, D2T2 (dye diffusion thermal transfer) , photographical techniques, wax printing (TTR ribbons) or laser engraving.
At the same time or in a second phase the metallic writable layer is digitally personalized by means of a infrared (1064 nm) or green (432 nm) or uv Nd/Yag (wave length = 355 nanometer or uv 266 nanometer) laser beams but preferably 355 nm.
The laser beam passing trough all the top layers removes the metallic area where it is focalised . Moving from point to point the laser can remove the metallic layer in the areas interested reproducing digitally variable data (images or writings or combination of both) . In this way for example , pictures and/or the name of the person who the document belongs to, can be reproduced either in a positive or in negative mode.
The metallic layer can be composed by opaque metals such as aluminium, bismuth, copper or by a transparent layer (such as ZnS, ZrS, SiOx, TiOx, ) or by a multilayer mixed construction of the above materials. The total thickness of the metallic layer can vary from 20 to 1000 angstrom.
The pattern of the hologram giving the best results are continuous and uniform gratings like rainbow patterns or even reflecting areas, best reflecting at different angles by rotating vertically or horizontally, but of course any type of pattern can be used.
This type of proposed hologram can be combined with any type of computer originated holograms (such as kinegram, exelgram, movigram, Swissgram) and/or traditional reflection/transmittance holograms or a combination of the techniques.
Holographic grating can also be constructed in the way that its maximum reflection intensity is seen at a certain angles from the vertical or from the horizontal of the document's surface to be protected: for instance between 45°and 90° vertically, as shown schematically in Figure 5. So normally when looking at the document the observer does not see the holographic grating looking at it from the vertical, but the document has to be turned around its axis of at least 45°.
The present invention is subject to numerous modifications and variations, all falling within the inventive concept expressed in the attached claims, while the technical details can vary according to specific requirements.

Claims

1. Method of personalizing metallic holographic layers applicable on substrates, comprising the steps of transferring onto said substrate by means of a appropriate transferring process a writeable foil comprised at least by a first layer composed of a film carrier, a second layer with a holographic grating recorded microstructure, a third layer composed by a metallic layer and at least a suitable adhesive layer, whereby a digital personalization phase of the metallic layer is provided for printing data and/or pictures in the correspondent area and a phase of digital personalization acting on said metallic writable layer by means of a laser beam, is also provided.
2. Method according to Claim 1, whereby said metallic writable foil is positioned under a heated die or roller and said heated die or said roller is brought into contact with the foil from said film carrier side, being applied also a pressure that forces said metallic writable foil to be in contact, by means of said adhesive layer, with the document surface, the heat being transferred through said layers, thus activating the adhesive. 3. Method according to any of the preceding claims, whereby said adhesive layer is an irreversible heat activated adhesive layer composed by polymers that have a thickness between 1 micron and 20 microns.
4. Method according to any of the preceding claims, whereby the thickness of the layer of the film carrier is comprised between 6 and 100 microns .
5. Method according to any of the preceding claims, whereby a releasing layer is further provided, said releasing layer having thickness from 0,001 to 2 microns and being composed of thermoplastic polymers able to release off said- irreversible adhesive layer, said metallic layer and said holographic grating layer.
6. Method according to Claim 1, whereby said metallic layer is transferred onto said substrate in a form of a sticker and said sticker, in a roll form or in sheets, is removed from the backing liner and applied on the documents to be protected 8. Method according to Claim 6, whereby said metallic layer is transferred onto the document substrate by means of a pressure sensitive adhesive layer composed by an adhesive and a protective backing liner. 8. Method according to claims 6 or 7, whereby the thickness of the layer of the film carrier is comprised between 6 and 150 microns.
9. Method according to Claim 1, whereby said metallic layer is transferred onto said substrate in a form of a laminate that comprises said film carrier and a heat activated adhesive or a wet gluing layer. 10. Method according to Claim 9, whereby the metallic writable foil is positioned under an heated die or roller and the heated die or roller is brought into contact with the foil from the carrier side, being applied also a pressure that forces the foil to be in contact with the adhesive layer with the document surface and then transfers the heat through the layers, activating the adhesive.
11. Method according to claims 9 or 10, whereby the thickness of said heat activated layer can vary from 20 to 150 microns and said heat activated layer is composed by thermoplastic high cohesive polymers that can be melted by heat and welded with the substrate of destination.
12. Method according to any of the claims from 9 to 11, whereby the metallic writable foil can be applied to said substrate also gluing them together by means of two-components wet polyurethane glue.
13. Method according any of the claims from 9 to 12, whereby the thickness of said film carrier layer is comprised from 6 to 175 microns.
14. Method according to any of the preceding claims, whereby the total thickness of the metallic layer can be chosen between 10 and 2000 angstrom, depending on the type of metallic layer. 15. Method according to any of the preceding claims, whereby the layer with holographic grating recorded microstructure is composed by thermoplastic polymers that have a Tg above 100°C but preferably 150°C, with thickness ranging between 0,2 - 3 microns, but typically between 0,6 - 0,7 microns.
16. Method according to any of the preceding claims, whereby said metallic writable layer is digitally personalized by means of a infrared or green or uv Nd/Yag laser beam. 17. Method according to any of the preceding claims, whereby said metallic writable layer is composed by opaque metals such as aluminium, bismuth, copper or by a transparent layer (such as ZnS, ZrS, SiOx, TiOx, ) or by a multilayer mixed construction of the above materials.
18. Metallic writable layer product applicable on substrates, whereby said metallic writable layer comprises at least a first layer composed of a film carrier, a second layer with a holographic grating recorded microstructure, a third layer composed by a grating recorded microstructure, a third layer composed by a metallic layer and at least a suitable adhesive layer.
19. Metallic writable layer product according to Claim 18, whereby said adhesive layer is an irreversible heat activated adhesive layer composed by acrylic polymers that have a thickness between 1 micron and 20 microns.
20. Metallic writable layer product according to Claim 18 and 19, whereby a releasing layer is further provided, said releasing layer having thickness from 0,001 to 2 microns and being composed of thermoplastic polymers able to release off said irreversible adhesive layer, said metallic layer and said holographic grating layer.
21. Metallic writable layer product according to Claim 18, whereby said adhesive layer is a pressure sensitive adhesive layer composed by an adhesive and a protection backing liner. 22. Metallic writable layer product according to claim 18, whereby it comprises an heat activated layer composed by thermoplastic high cohesive polymers that can be melted by heat and welded with the substrate of destination.
PCT/IT2003/000701 2003-10-30 2003-10-30 Method of personalizing metallic holographic layers applicable on substrates WO2005043254A1 (en)

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Cited By (4)

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FR2908223A1 (en) * 2006-11-07 2008-05-09 Hologram Ind Sarl METHOD FOR MANUFACTURING SECURE PROTECTIVE FILMS AND RELATED FILMS FOR THE PROTECTION OF IDENTITY DOCUMENTS
EP1956414A1 (en) 2007-02-09 2008-08-13 Leo Vermeulen Consulting LVC Lenticular foils or linear Fresnel lenses provided with a highly refractive layer
ITMI20090931A1 (en) * 2009-05-27 2010-11-28 Ct Grafico Dg S P A ANTI-COUNTERFEITING DEVICE FOR VALUE DOCUMENTS AND ITS SAFETY SUPPORT
US10112434B2 (en) 2008-05-16 2018-10-30 Entrust Datacard Corporation Shadow image security feature

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US5759683A (en) * 1994-04-04 1998-06-02 Novavision, Inc. Holographic document with holographic image or diffraction pattern directly embossed thereon

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US4856857A (en) * 1985-05-07 1989-08-15 Dai Nippon Insatsu Kabushiki Kaisha Transparent reflection-type
US5331443A (en) * 1992-07-31 1994-07-19 Crown Roll Leaf, Inc. Laser engraved verification hologram and associated methods
US5759683A (en) * 1994-04-04 1998-06-02 Novavision, Inc. Holographic document with holographic image or diffraction pattern directly embossed thereon

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2908223A1 (en) * 2006-11-07 2008-05-09 Hologram Ind Sarl METHOD FOR MANUFACTURING SECURE PROTECTIVE FILMS AND RELATED FILMS FOR THE PROTECTION OF IDENTITY DOCUMENTS
EP1956414A1 (en) 2007-02-09 2008-08-13 Leo Vermeulen Consulting LVC Lenticular foils or linear Fresnel lenses provided with a highly refractive layer
US10112434B2 (en) 2008-05-16 2018-10-30 Entrust Datacard Corporation Shadow image security feature
ITMI20090931A1 (en) * 2009-05-27 2010-11-28 Ct Grafico Dg S P A ANTI-COUNTERFEITING DEVICE FOR VALUE DOCUMENTS AND ITS SAFETY SUPPORT
WO2010137049A1 (en) * 2009-05-27 2010-12-02 Centro Grafico Dg S.P.A. Anti-counterfeit device for valuable documents

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