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EP0349537A1 - Adhesive sheet material - Google Patents

Adhesive sheet material

Info

Publication number
EP0349537A1
EP0349537A1 EP88901283A EP88901283A EP0349537A1 EP 0349537 A1 EP0349537 A1 EP 0349537A1 EP 88901283 A EP88901283 A EP 88901283A EP 88901283 A EP88901283 A EP 88901283A EP 0349537 A1 EP0349537 A1 EP 0349537A1
Authority
EP
European Patent Office
Prior art keywords
image
sheet material
photograph
flexible sheet
sheet
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.)
Withdrawn
Application number
EP88901283A
Other languages
German (de)
French (fr)
Inventor
Graham Tremlett Ridout
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.)
De la Rue International Ltd
Original Assignee
Thomas De la Rue and Co Ltd
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 Thomas De la Rue and Co Ltd filed Critical Thomas De la Rue and Co Ltd
Publication of EP0349537A1 publication Critical patent/EP0349537A1/en
Withdrawn legal-status Critical Current

Links

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B42D15/00—Printed matter of special format or style not otherwise provided for
    • B42D15/02—Postcards; Greeting, menu, business or like cards; Letter cards or letter-sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/06—Embossing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • B42D25/40—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
    • B42D25/465—Associating two or more layers using chemicals or adhesives
    • B42D25/47—Associating two or more layers using chemicals or adhesives using adhesives
    • 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
    • G03H1/0005—Adaptation of holography to specific applications
    • G03H1/0011—Adaptation of holography to specific applications for security or authentication
    • 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
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
    • G09F3/02—Forms or constructions
    • G09F3/0291—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time
    • G09F3/0292—Labels or tickets undergoing a change under particular conditions, e.g. heat, radiation, passage of time tamper indicating labels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00—Coating on the layer surface
    • B32B2255/20—Inorganic coating
    • B32B2255/205—Metallic coating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/412—Transparent
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2425/00—Cards, e.g. identity cards, credit cards
    • B42D2033/04—
    • B42D2033/30—
    • B42D2033/32—
    • 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
    • B42D25/309—Photographs
    • 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
    • G03H2250/40—Printed information overlapped with the hologram

Definitions

  • This invention relates to an adhesive sheet material particularly for use in laminating images on identity documents.
  • the invention aims to provide an improved sheet material to prevent a successful exchange.
  • the invention provides a flexible sheet material comprising a transparent cover sheet, a transparent image layer adhered to the rear surface of the cover sheet, and an adhesive on the rear surface of the image layer, the latter surface carrying a metallised image such that the image can be seen from the front surface of the cover sheet.
  • the image is embossed and metallised lightly so that the image can be seen but the sheet material is still transparent.
  • the embossed image may be a holographic image.
  • the image layer is much thinner and more fragile than the cover sheet, but the adhesive on its rear surface is much stronger than the adhesion between the sheet and the layer.
  • the cover layer When used to laminate a photograph, the cover layer will peel off, leaving the - image irremovably on the photograph, if there is an attempt to tamper with it.
  • the image may be holographic or laser generated.
  • Fig. 1 shows the cross-section of an adhesive sheet material
  • Fig. 2 shows the cross-section of part of a photograph laminated onto a base.
  • the sheet material in Fig. 1 comprises a transparent cover layer 10,. for example polythene or polyester about 12 microns thick. On its rear or lower surface is a thin layer 11 of wax which serves as an adhesive. Applied to this is a further transparent image layer 12, much thinner than the cover layer 10, e.g. 2 microns.
  • the image layer 12 is a thermoplastic, the bottom or rear surface 13 of which is profiled by embossing so that it carries a relief pattern or image. This pattern is made visible by partial metallisation to form a further layer 14 which is microscopically thin, so thin in fact that it is still transparent.
  • a further pressure sensitive adhesive layer 17 is applied to rear the of the metallisation layer 14, and finally a protective or release sheet 18.
  • the sheet material is preferably produced by applying the wax layer 11 to the cover layer 10, and then coating the layer 11 with a lacquer in the form of a liquid emulsion of an acrylic or similar plastic. When this dries or sets, it forms a very thin thermoplastic layer. This is then machine embossed on surface 13 with a very fine shallow relief image, such as a holographic image, a diffraction pattern or a simple etched pattern done by hand.
  • the image might be embossed on a self-supporting thermoplastic sheet which is afterwards laminated with the wax and the cover layer 10.
  • the sheet material is used by first stripping off the sheet 18 to reveal the adhesive layer 17.
  • a photograph 20 is placed in position on a backing sheet 21 e.g. a page of a passport.
  • the sheet material with the layer 17 face down is placed over the photograph 20 and extending beyond its edges over the sheet 21.
  • Pressure is now applied o cause the layer 17 to adhere to the upper surfaces of both photograph 20 and sheet 21.
  • the effect is to lock the photograph 20 in place, laminated between the cover layer 10 and the backing sheet 21.
  • the photograph may itself be stuck directly to the backing sheet 21.
  • the photograph is still quite clear for comparison with the person presenting the document, but over its surface it carries a very slight glistening image as embossed on image layer 12. This is clearly visible to verify that the photograph has not been tampered with.
  • the cover layer 10 must inevitably be removed first, and it is arranged that whether or not heat is applied, it is inevitably the wax layer 11 which will separate before the adhesive layer 17. Consequently, the photograph retains the image layer 12, which cannot be parted from it without destroying it. Because layer 12 is so thin, it will be destroyed if there is an attempt to separate it also. When the substitute photograph is put in its place, it will inevitably lack the embossed image, and the fake will be easily recognised. If the image is a holographic one, this would be extremely difficult to simulate even if a substitute image of some sort could be contrived, since a holographic image is not copiable without access to the original master place.
  • the image is not actually embossed. It can be produced for example by simple masked metallisation of the surface. This is not quite so difficult to copy as a hologram, but would still require considerable work to forge. It may therefore provide sufficient security against fraud.
  • the invention can be applied to the provision of tamper-proof labels.
  • the label in this case, there is no need to see through the label which is simply applied to an article to be proved genuine.
  • the image may be embossed or not as before, and the metallisation may be full (i.e. opaque) or partial. The image needs only to be in some way difficult to reproduce.
  • Such a label when applied is then impossible to remove for illicit use, since the delicate image layer will be left behind and destroyed by any further tampering.

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Toxicology (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Security & Cryptography (AREA)
  • Laminated Bodies (AREA)
  • Credit Cards Or The Like (AREA)
  • Holo Graphy (AREA)

Abstract

Un matériau en feuille flexible comprend une feuille de revêtement transparente, une couche image transparente adhérant au verso de la feuille de revêtement et un adhésif placé sur le verso de la couche image, la surface du verso portant une image métallisée visible depuis la surface du recto de la feuille de revêtement. L'image peut être gaufrée et métallisée seulement légèrement de façon à être visible, le matériau en feuille restant cependant transparent. Ce matériau peut être utilisé pour des documents d'identité, dans lesquels la photographie est recouverte par ledit matériau mais reste visible à travers l'image.Flexible sheet material includes a transparent cover sheet, a transparent image layer adhering to the back of the cover sheet and an adhesive placed on the back of the image layer, the surface of the back having a metallized image visible from the surface of the front of the covering sheet. The image can be embossed and metallized only slightly so as to be visible, the sheet material however remaining transparent. This material can be used for identity documents, in which the photograph is covered by said material but remains visible through the image.

Description

Adhesive Sheet Material
This invention relates to an adhesive sheet material particularly for use in laminating images on identity documents.
Passports and many other identity documents require a photograph of the owner to be securely affixed to prevent exchange of the photograph for fraudulent purposes. It is common practice to laminate a transparent sheet material over the photograph and the surrounding paper or card. However, it is known that forgers are able to lift the transparent sheet and exchange the photograph.
Attempts have been made to incorporate a message, such as the work 'VOID', in the adhesive of the sheet material, the word only appearing if the lamination is tampered with. This has been only partially successful. The invention aims to provide an improved sheet material to prevent a successful exchange.
Accordingly, the invention provides a flexible sheet material comprising a transparent cover sheet, a transparent image layer adhered to the rear surface of the cover sheet, and an adhesive on the rear surface of the image layer, the latter surface carrying a metallised image such that the image can be seen from the front surface of the cover sheet. Preferably, the image is embossed and metallised lightly so that the image can be seen but the sheet material is still transparent. The embossed image may be a holographic image.
Preferably, the image layer is much thinner and more fragile than the cover sheet, but the adhesive on its rear surface is much stronger than the adhesion between the sheet and the layer. When used to laminate a photograph, the cover layer will peel off, leaving the - image irremovably on the photograph, if there is an attempt to tamper with it.
To make the image virtually uncopiable, it may be holographic or laser generated.
In order that the invention shall be clearly understood, an exemplary embodiment thereof will now be described with reference to the accompanying drawings, in which:
Fig. 1 shows the cross-section of an adhesive sheet material;
Fig. 2 shows the cross-section of part of a photograph laminated onto a base.
The sheet material in Fig. 1 comprises a transparent cover layer 10,. for example polythene or polyester about 12 microns thick. On its rear or lower surface is a thin layer 11 of wax which serves as an adhesive. Applied to this is a further transparent image layer 12, much thinner than the cover layer 10, e.g. 2 microns. The image layer 12 is a thermoplastic, the bottom or rear surface 13 of which is profiled by embossing so that it carries a relief pattern or image. This pattern is made visible by partial metallisation to form a further layer 14 which is microscopically thin, so thin in fact that it is still transparent. A further pressure sensitive adhesive layer 17 is applied to rear the of the metallisation layer 14, and finally a protective or release sheet 18.
The sheet material is preferably produced by applying the wax layer 11 to the cover layer 10, and then coating the layer 11 with a lacquer in the form of a liquid emulsion of an acrylic or similar plastic. When this dries or sets, it forms a very thin thermoplastic layer. This is then machine embossed on surface 13 with a very fine shallow relief image, such as a holographic image, a diffraction pattern or a simple etched pattern done by hand.
In an alternative, the image might be embossed on a self-supporting thermoplastic sheet which is afterwards laminated with the wax and the cover layer 10.
The sheet material is used by first stripping off the sheet 18 to reveal the adhesive layer 17. Referring to Fig. 2, a photograph 20 is placed in position on a backing sheet 21 e.g. a page of a passport. The sheet material with the layer 17 face down is placed over the photograph 20 and extending beyond its edges over the sheet 21. Pressure is now applied o cause the layer 17 to adhere to the upper surfaces of both photograph 20 and sheet 21. The effect is to lock the photograph 20 in place, laminated between the cover layer 10 and the backing sheet 21. The photograph may itself be stuck directly to the backing sheet 21.
Visually, the photograph is still quite clear for comparison with the person presenting the document, but over its surface it carries a very slight glistening image as embossed on image layer 12. This is clearly visible to verify that the photograph has not been tampered with.
If substitution is attempted, the cover layer 10 must inevitably be removed first, and it is arranged that whether or not heat is applied, it is inevitably the wax layer 11 which will separate before the adhesive layer 17. Consequently, the photograph retains the image layer 12, which cannot be parted from it without destroying it. Because layer 12 is so thin, it will be destroyed if there is an attempt to separate it also. When the substitute photograph is put in its place, it will inevitably lack the embossed image, and the fake will be easily recognised. If the image is a holographic one, this would be extremely difficult to simulate even if a substitute image of some sort could be contrived, since a holographic image is not copiable without access to the original master place.
In a modification, the image is not actually embossed. It can be produced for example by simple masked metallisation of the surface. This is not quite so difficult to copy as a hologram, but would still require considerable work to forge. It may therefore provide sufficient security against fraud.
In a yet further modification, the invention can be applied to the provision of tamper-proof labels. in this case, there is no need to see through the label which is simply applied to an article to be proved genuine. The image may be embossed or not as before, and the metallisation may be full (i.e. opaque) or partial. The image needs only to be in some way difficult to reproduce. Such a label when applied is then impossible to remove for illicit use, since the delicate image layer will be left behind and destroyed by any further tampering.

Claims

Claims
1. A flexible sheet material comprising a transparent cover sheet, a transparent image layer adhered to the rear surface of the cover sheet, and an adhesive on the rear surface of the image layer, the latter surface carrying a metallised image such that the image can be seen from the front surface of the cover sheet.
2. A flexible sheet material as claimed in Claim 1 wherein the adhesive on the rear surface has much stronger adhesion than that between the sheet and the image layer.
3. A flexible sheet material as claimed in Claim 1 or 2 wherein the image layer is relatively thinner and more fragile than the cover sheet.
4. A flexible sheet material as claimed in any of Claims 1 to 3 wherein the image is embossed before being metallised.
5. A flexible sheet material as claimed in Claim 4 wherein the image is a holographic image.
6. A flexible sheet material as claimed in any of the Claims 1 to 5 wherein the metallisation is only partial so that the image can be seen but the sheet material is still transparent.
7. A flexible sheet material as claimed in any preceding Claim wherein the attachment between the sheet and the image layer is produced by a wax.
8. A flexible sheet material as claimed in any preceding Claim wherein the adhesive on the rear surface is covered by a release sheet.
9. An identity document in which a photograph is covered by a flexible sheet material, as defined in Claim 6, which extends beyond the edges of the photograph so that the adhesive on the rear surface thereof adheres to the document, the photograph being 0 visible through the partially metallised image.
10. An identity document as claimed in Claim 9, wherein removal of the cover sheet leaves the image layer firmly attached to the photograph. 5
11. An identity document as claimed in Claim 10 wherein the image layer is too fragile to be removed intact from the photograph.
:0 12. A method of manufacturing a flexible sheet material as claimed in any of Claims 1 to 8 which includes the steps of applying a wax layer to a self- supporting sheet of plastics material, coating the wax with a liquid emulsion of a plastics material, and 5 allowing the emulsion to dry out to form a further but relatively thinner plastic sheet.
EP88901283A 1987-02-05 1988-02-01 Adhesive sheet material Withdrawn EP0349537A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB878702573A GB8702573D0 (en) 1987-02-05 1987-02-05 Adhesive sheet material
GB8702573 1987-02-05

Publications (1)

Publication Number Publication Date
EP0349537A1 true EP0349537A1 (en) 1990-01-10

Family

ID=10611756

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88901283A Withdrawn EP0349537A1 (en) 1987-02-05 1988-02-01 Adhesive sheet material

Country Status (10)

Country Link
EP (1) EP0349537A1 (en)
JP (1) JPH02502616A (en)
KR (1) KR890700480A (en)
AU (1) AU1229288A (en)
DK (1) DK554588D0 (en)
FI (1) FI893666A0 (en)
GB (2) GB8702573D0 (en)
IE (1) IE880304L (en)
NO (1) NO884307L (en)
WO (1) WO1988005728A1 (en)

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WO1990008661A1 (en) † 1989-01-31 1990-08-09 Dai Nippon Insatsu Kabushiki Kaisha Thermal transfer recording medium
GB8924111D0 (en) * 1989-10-26 1989-12-13 Amblehurst Ltd Optical device
DE4018737A1 (en) * 1990-06-12 1991-12-19 Schreiner Etiketten SELF-ADHESIVE LABEL FOR ATTACHING AND SEALING A PASSAGE
ES2043531B1 (en) * 1992-02-21 1994-06-16 Brunat Rosendo M Montaner NEW DISPOSITION OF SELF-SEALABLE COLD COVER FOR DOCUMENT PROTECTION.
GB2280875A (en) * 1993-08-12 1995-02-15 Martin John Richardson Colourgram
EP0755776A1 (en) * 1995-07-28 1997-01-29 Minnesota Mining and Manufacturing Company Multilayer film
ES2137805B1 (en) * 1996-04-12 2000-08-16 I D Tec S L PRODUCTION PROCEDURE OF A PRINTED SECURITY CORE FOR IDENTITY DOCUMENTS AND A PRINTED SECURITY CORE.

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Also Published As

Publication number Publication date
WO1988005728A1 (en) 1988-08-11
IE880304L (en) 1988-08-05
GB2226980B (en) 1991-02-13
GB8702573D0 (en) 1987-03-11
DK554588A (en) 1988-10-04
NO884307L (en) 1988-11-16
NO884307D0 (en) 1988-09-29
GB8917837D0 (en) 1989-10-04
DK554588D0 (en) 1988-10-04
AU1229288A (en) 1988-08-24
JPH02502616A (en) 1990-08-23
GB2226980A (en) 1990-07-18
KR890700480A (en) 1989-04-25
FI893666A0 (en) 1989-08-02

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