CA2949593C - Improvements in and relating to security documents. - Google Patents
Improvements in and relating to security documents. Download PDFInfo
- Publication number
- CA2949593C CA2949593C CA2949593A CA2949593A CA2949593C CA 2949593 C CA2949593 C CA 2949593C CA 2949593 A CA2949593 A CA 2949593A CA 2949593 A CA2949593 A CA 2949593A CA 2949593 C CA2949593 C CA 2949593C
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- security
- layer
- fluorescent
- transfer
- fluorescent layer
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Classifications
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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
- B42D25/20—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof characterised by a particular use or purpose
- B42D25/24—Passports
-
- 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
- B42D25/27—Lots, e.g. lottery tickets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/355—Security threads
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
- B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
- B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
- B42D25/30—Identification or security features, e.g. for preventing forgery
- B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
- B42D25/378—Special inks
- B42D25/387—Special inks absorbing or reflecting ultraviolet light
-
- 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
Abstract
A security document (10) including a security device, and a method of manufacturing such a document. The document (10) includes a first fluorescent layer (130) which fluoresces in a first visible colour when exposed to ultraviolet light; a UV blocking layer (120) which is opaque to ultraviolet light, but transmits visible light; and a second fluorescent layer (110) which fluoresces in a second, different, visible colour when exposed to ultraviolet light. The second fluorescent layer (110) is part of a security transfer (50) which is affixed to the face of the security document substrate (20). The security transfer (50) has an inner face proximal to the security substrate (20) and an outer face distal to the security substrate. The second fluorescent layer (110) is closer to the outer face of the security transfer than either of the first fluorescent layer (130) or the UV blocking layer (120).
Description
Improvement s in and relating to security documents.
Field of the Invention The present invention concerns improvements in and relating to security documents. More particularly, this invention concerns a fluorescent security feature for incorporation in a security document.
Background of the Invention Security documents, for example banknotes, passports, lottery tickets, some certificates and other items of potentially high value are targets for counterfeiters, who seek to produce counterfeit copies of the security documents and thus illegally benefit from the high value of the genuine items. Security documents typically include various security devices or features that are difficult for a counterfeiter to simulate. Such features include holograms, security threads (typically ribbons of metallised polymer running across the length or width of the document), security fibres (typically small dyed fibres of twine or small printed paper sheets, embedded in and scattered throughout the substance of the security document), and security planchettes (typically circular pieces of paper or polymer embedded in and scattered throughout the substance of the security document). Many such security devices exhibit a fluorescent response, reproduction of which is an additional burden for the counterfeiter.
Field of the Invention The present invention concerns improvements in and relating to security documents. More particularly, this invention concerns a fluorescent security feature for incorporation in a security document.
Background of the Invention Security documents, for example banknotes, passports, lottery tickets, some certificates and other items of potentially high value are targets for counterfeiters, who seek to produce counterfeit copies of the security documents and thus illegally benefit from the high value of the genuine items. Security documents typically include various security devices or features that are difficult for a counterfeiter to simulate. Such features include holograms, security threads (typically ribbons of metallised polymer running across the length or width of the document), security fibres (typically small dyed fibres of twine or small printed paper sheets, embedded in and scattered throughout the substance of the security document), and security planchettes (typically circular pieces of paper or polymer embedded in and scattered throughout the substance of the security document). Many such security devices exhibit a fluorescent response, reproduction of which is an additional burden for the counterfeiter.
- 2 -GB2300596 discloses a fluorescent material for use in a security document, the material comprising a transparent or translucent substrate and two fluorescent components, one on each side of the substrate, which fluoresce UV light at different visible colours, and a UV light absorber. Thus, when the composite material is viewed alternately in transmitted and reflected ultraviolet light the fluorescent colour perceived by the viewer will change. Furthermore, when the material is viewed in either transmitted or reflected ultraviolet light, the fluorescent colour perceived by the viewer changes when the composite material is turned over.
GB2490603A discloses a planar security device such as a security thread or a security fibre, for use in a security document. The security device has a first and second side and comprises: a substrate; a first fluorescent layer on the first side of the substrate; a layer of UV absorbent material on the first fluorescent layer; and a second fluorescent layer on the layer of UV absorbent material.
Again, when the security device is viewed alternately in transmitted and reflected ultraviolet light the fluorescent colour perceived by the viewer will change, and, when the material is viewed in either transmitted or reflected ultraviolet light, the fluorescent colour perceived by the viewer changes when the composite material is turned over.
In the example of security fibres described in GB2490603A, the security devices are mixed into the paper pulp from which the security document is made, so that the security devices are randomly distributed within the security document. In the example of a security thread, the security
GB2490603A discloses a planar security device such as a security thread or a security fibre, for use in a security document. The security device has a first and second side and comprises: a substrate; a first fluorescent layer on the first side of the substrate; a layer of UV absorbent material on the first fluorescent layer; and a second fluorescent layer on the layer of UV absorbent material.
Again, when the security device is viewed alternately in transmitted and reflected ultraviolet light the fluorescent colour perceived by the viewer will change, and, when the material is viewed in either transmitted or reflected ultraviolet light, the fluorescent colour perceived by the viewer changes when the composite material is turned over.
In the example of security fibres described in GB2490603A, the security devices are mixed into the paper pulp from which the security document is made, so that the security devices are randomly distributed within the security document. In the example of a security thread, the security
- 3 -device is inserted into the security document during manufacture of the paper, for example by threading the device into the document using a roller. In other embodiments, the security device is applied to the formed security document, for example by printing or coating.
Both of the above disclosures describe examples of security features which exhibit an effect described herein as a "colour switch" effect. When a first side of the device is viewed in reflected UV light, one fluorescent layer fluoresces strongly, but the other fluorescent layer fluoresces only weakly, if at all, because the UV absorbent material prevents the UV light from passing through to that other fluorescent layer. On the other hand, when the first side of the device is viewed in transmitted UV light, the fluorescent layer that previously fluoresced strongly, now fluoresces only weakly, if at all, because the UV absorbent material prevents the UV light from passing through to it.
The other fluorescent layer, however, now fluoresces strongly because the UV light falls directly on and excites that fluorescent layer. Because the fluorescence is in the visible spectrum, the fluorescence passes through the UV
absorbent material and is visible to the viewer. If one fluorescent layer fluoresces in a first colour and the other fluorescent layer fluoresces in a second colour, then when the illumination of the device changes from reflected to transmitted UV light, the effect perceived by the viewer is that the visible fluorescence changes colour.
The colour-switch materials of GB2300596 and GB2490603A
provide a striking and readily recognisable effect, providing good protection from counterfeiters. However, it
Both of the above disclosures describe examples of security features which exhibit an effect described herein as a "colour switch" effect. When a first side of the device is viewed in reflected UV light, one fluorescent layer fluoresces strongly, but the other fluorescent layer fluoresces only weakly, if at all, because the UV absorbent material prevents the UV light from passing through to that other fluorescent layer. On the other hand, when the first side of the device is viewed in transmitted UV light, the fluorescent layer that previously fluoresced strongly, now fluoresces only weakly, if at all, because the UV absorbent material prevents the UV light from passing through to it.
The other fluorescent layer, however, now fluoresces strongly because the UV light falls directly on and excites that fluorescent layer. Because the fluorescence is in the visible spectrum, the fluorescence passes through the UV
absorbent material and is visible to the viewer. If one fluorescent layer fluoresces in a first colour and the other fluorescent layer fluoresces in a second colour, then when the illumination of the device changes from reflected to transmitted UV light, the effect perceived by the viewer is that the visible fluorescence changes colour.
The colour-switch materials of GB2300596 and GB2490603A
provide a striking and readily recognisable effect, providing good protection from counterfeiters. However, it
4 would be advantageous to provide an improved security device that is still harder for counterfeiters to simulate.
Summary of the Invention The present invention, in a first aspect, provides a method of producing a security document, the method comprising:
(i) providing a security document substrate having a face;
(ii) providing a first fluorescent layer, the first fluorescent layer being fluorescent in a first visible colour when it is exposed to ultraviolet light;
(iii) providing a UV blocking layer, the UV blocking layer being opaque to ultraviolet light but transmitting visible light;
(iv) providing a security transfer, the security transfer being mounted on a transfer substrate, and comprising a second fluorescent layer, the second fluorescent layer being fluorescent in a second, different, visible colour when it is exposed to ultraviolet light;
(v) affixing the security transfer to the face of the security document such that the transfer substrate is furthest from the face of the security document substrate and the second fluorescent layer is closer to the transfer substrate than are any of: the first fluorescent layer and the UV blocking layer;
Summary of the Invention The present invention, in a first aspect, provides a method of producing a security document, the method comprising:
(i) providing a security document substrate having a face;
(ii) providing a first fluorescent layer, the first fluorescent layer being fluorescent in a first visible colour when it is exposed to ultraviolet light;
(iii) providing a UV blocking layer, the UV blocking layer being opaque to ultraviolet light but transmitting visible light;
(iv) providing a security transfer, the security transfer being mounted on a transfer substrate, and comprising a second fluorescent layer, the second fluorescent layer being fluorescent in a second, different, visible colour when it is exposed to ultraviolet light;
(v) affixing the security transfer to the face of the security document such that the transfer substrate is furthest from the face of the security document substrate and the second fluorescent layer is closer to the transfer substrate than are any of: the first fluorescent layer and the UV blocking layer;
- 5 -(vi) removing the transfer substrate from the security transfer, leaving the second fluorescent layer affixed to the face of the security document.
The method thus provides a method of providing a "colour switch" security feature in a security document.
The incorporation of one or more of the layers required to produce a colour switch effect in a security transfer enables the colour switch layers to be applied easily and in a much greater range of patterns (which may be intricate) than in the prior-art methods, and in combinations not possible using the prior-art methods. In contrast to the prior-art methods, the present method enables a colour-switch image (for example fine text, or a larger area of multi-tone print) to be provided in a specific place on a security document. Moreover, a complex pattern can be produced from a single transfer process without the need to print multiple layers in register in multiple passes. By transferring only part of a large sheet in a single transfer process, for example, precise register of the edges of the transferred pattern can be achieved.
It may be that the security transfer further comprises an adhesive layer. It may be that the adhesive layer is the layer of the security transfer furthest from the transfer substrate.
Optionally, there is a release layer between the transfer substrate and the security transfer.
It may be that the first fluorescent layer is provided as a separate layer on the security document substrate. It may be that the first fluorescent layer is provided as a
The method thus provides a method of providing a "colour switch" security feature in a security document.
The incorporation of one or more of the layers required to produce a colour switch effect in a security transfer enables the colour switch layers to be applied easily and in a much greater range of patterns (which may be intricate) than in the prior-art methods, and in combinations not possible using the prior-art methods. In contrast to the prior-art methods, the present method enables a colour-switch image (for example fine text, or a larger area of multi-tone print) to be provided in a specific place on a security document. Moreover, a complex pattern can be produced from a single transfer process without the need to print multiple layers in register in multiple passes. By transferring only part of a large sheet in a single transfer process, for example, precise register of the edges of the transferred pattern can be achieved.
It may be that the security transfer further comprises an adhesive layer. It may be that the adhesive layer is the layer of the security transfer furthest from the transfer substrate.
Optionally, there is a release layer between the transfer substrate and the security transfer.
It may be that the first fluorescent layer is provided as a separate layer on the security document substrate. It may be that the first fluorescent layer is provided as a
- 6 -separate layer by affixing the first fluorescent layer to the security document substrate using a transfer.
Alternatively, it may be that the security document substrate is the first fluorescent layer.
It may be that the UV blocking layer is provided as a separate layer on the security document substrate. It may be that the UV blocking layer is provided as a separate layer on the first layer. It may be that the UV blocking layer is provided as a separate layer by affixing the UV blocking layer to the security document substrate using a transfer.
Alternatively, it may be that the security document substrate is the UV blocking layer. Thus, it may be that the security document substrate is the first fluorescent layer and the UV blocking layer. It may be that the UV
blocking layer is transparent to visible light.
It may be that the first fluorescent layer is on the same side of the security document substrate as the security transfer. It may be that the first fluorescent layer is on the opposite side of the security document substrate to the security transfer. It may be that the UV blocking layer is on the same side of the security document substrate as the security transfer. It may be that the UV blocking layer is on the opposite side of the security document substrate to the security transfer.
It may that the first fluorescent layer is on the same side of the security document as the UV blocking layer. It may be that the first fluorescent layer is on the opposite side of the security document substrate to the UV blocking layer.
Alternatively, it may be that the security document substrate is the first fluorescent layer.
It may be that the UV blocking layer is provided as a separate layer on the security document substrate. It may be that the UV blocking layer is provided as a separate layer on the first layer. It may be that the UV blocking layer is provided as a separate layer by affixing the UV blocking layer to the security document substrate using a transfer.
Alternatively, it may be that the security document substrate is the UV blocking layer. Thus, it may be that the security document substrate is the first fluorescent layer and the UV blocking layer. It may be that the UV
blocking layer is transparent to visible light.
It may be that the first fluorescent layer is on the same side of the security document substrate as the security transfer. It may be that the first fluorescent layer is on the opposite side of the security document substrate to the security transfer. It may be that the UV blocking layer is on the same side of the security document substrate as the security transfer. It may be that the UV blocking layer is on the opposite side of the security document substrate to the security transfer.
It may that the first fluorescent layer is on the same side of the security document as the UV blocking layer. It may be that the first fluorescent layer is on the opposite side of the security document substrate to the UV blocking layer.
- 7 -It may be that the first fluorescent layer is on the same side of the security document substrate as the second fluorescent layer. It may be that the first fluorescent layer is on the opposite side of the security document substrate to the second fluorescent layer. It may be that the UV blocking layer is on the same side of the security document substrate as the second fluorescent layer. It may be that the UV blocking layer is on the opposite side of the security document substrate as the second fluorescent layer.
It may be that the first fluorescent layer, the UV
blocking layer and the second fluorescent layer are on the same side of the security document substrate.
It may be that the security document substrate is the UV blocking layer and the first fluorescent layer is on a first side of the security document substrate and the second fluorescent layer is on the other side of the security document substrate.
It may be that the layers are formed by different coloured fluorescent images that are laid down separately.
It may be that different coloured fluorescent images are laid down in a series of different strata. It may be that a stratum of fluorescent images contains one or more discontinuities. Thus, it may be that when a subsequent fluorescent image is laid down there are areas in which the subsequent image is on top of a previous ink and it may be that there are other areas (where the previous image stratum was discontinuous) where the subsequent image is adjacent to the previous image, and therefore forms part of the same physical layer. Thus, it may be that the first fluorescent layer also contains areas which fluoresce in one or more
It may be that the first fluorescent layer, the UV
blocking layer and the second fluorescent layer are on the same side of the security document substrate.
It may be that the security document substrate is the UV blocking layer and the first fluorescent layer is on a first side of the security document substrate and the second fluorescent layer is on the other side of the security document substrate.
It may be that the layers are formed by different coloured fluorescent images that are laid down separately.
It may be that different coloured fluorescent images are laid down in a series of different strata. It may be that a stratum of fluorescent images contains one or more discontinuities. Thus, it may be that when a subsequent fluorescent image is laid down there are areas in which the subsequent image is on top of a previous ink and it may be that there are other areas (where the previous image stratum was discontinuous) where the subsequent image is adjacent to the previous image, and therefore forms part of the same physical layer. Thus, it may be that the first fluorescent layer also contains areas which fluoresce in one or more
- 8 -a ddi t i on a 1 visible colours when exposed to ultra violet light. It may be that the second fluorescent layer also contains areas which fluoresce in one or more additional visible colours when exposed to ultra violet light. It may be that the first layer only fluoresces in the first visible colour and the second layer fluoresces in the second visible colour and one or more additional visible colours. It may be that the second layer only fluoresces in the second visible colour and the first visible layer fluoresces in one or more additional visible colours.
It may be that the security transfer is affixed to the face of the security document such that the first fluorescent layer is between the security document substrate and the second fluorescent layer. It may be that the security transfer is affixed to the face of the security document such that the UV blocking layer is between the security document substrate and the second fluorescent layer. It may be that the security transfer is affixed to the face of the security document such that the UV blocking layer is between the first fluorescent layer and the second fluorescent layer.
It may be that the UV blocking layer is provided as part of the security transfer. It may be that the security transfer comprises a release layer, the second fluorescent layer and the UV blocking layer. It may be that the second fluorescent layer is sandwiched between the UV blocking layer and the release layer on the transfer substrate.
It may be that the first fluorescent layer is provided as part of the security transfer. It may be that the security transfer comprises a release layer, the second
It may be that the security transfer is affixed to the face of the security document such that the first fluorescent layer is between the security document substrate and the second fluorescent layer. It may be that the security transfer is affixed to the face of the security document such that the UV blocking layer is between the security document substrate and the second fluorescent layer. It may be that the security transfer is affixed to the face of the security document such that the UV blocking layer is between the first fluorescent layer and the second fluorescent layer.
It may be that the UV blocking layer is provided as part of the security transfer. It may be that the security transfer comprises a release layer, the second fluorescent layer and the UV blocking layer. It may be that the second fluorescent layer is sandwiched between the UV blocking layer and the release layer on the transfer substrate.
It may be that the first fluorescent layer is provided as part of the security transfer. It may be that the security transfer comprises a release layer, the second
- 9 -fluorescent layer and the first fluorescent layer. It may be that the security transfer further comprises the UV
blocking layer. It may be that the second fluorescent layer is sandwiched between the first fluorescent layer and the release layer on the transfer substrate. It may be that the UV blocking layer is sandwiched between the first fluorescent layer and the second fluorescent layer on the transfer substrate. Thus, it may be that the structure of the security transfer is, in order: first fluorescent layer, UV blocking layer, second fluorescent layer, release layer, transfer substrate.
It may be that the removing of the transfer substrate from the security transfer takes place during the affixing of the security transfer to the face of the security document. Alternatively, it may be that the removing of the transfer substrate from the security transfer takes place after the affixing of the security transfer to the face of the security document.
It may be that the security transfer, prior to the affixing, is in the form of a sheet or ribbon. It may be that only a (transverse) portion of the second fluorescent layer on the sheet or ribbon is affixed to the face of the security document. It may be that only a (transverse) portion of the UV blocking layer on the sheet or ribbon is affixed to the face of the security document. It may be that only a (transverse) portion of the first fluorescent layer on the sheet or ribbon is affixed to the face of the security document. It may be that the portion of the sheet or ribbon that is affixed to the face of security document is a device, a pattern, a complex shape, an irregular shape
blocking layer. It may be that the second fluorescent layer is sandwiched between the first fluorescent layer and the release layer on the transfer substrate. It may be that the UV blocking layer is sandwiched between the first fluorescent layer and the second fluorescent layer on the transfer substrate. Thus, it may be that the structure of the security transfer is, in order: first fluorescent layer, UV blocking layer, second fluorescent layer, release layer, transfer substrate.
It may be that the removing of the transfer substrate from the security transfer takes place during the affixing of the security transfer to the face of the security document. Alternatively, it may be that the removing of the transfer substrate from the security transfer takes place after the affixing of the security transfer to the face of the security document.
It may be that the security transfer, prior to the affixing, is in the form of a sheet or ribbon. It may be that only a (transverse) portion of the second fluorescent layer on the sheet or ribbon is affixed to the face of the security document. It may be that only a (transverse) portion of the UV blocking layer on the sheet or ribbon is affixed to the face of the security document. It may be that only a (transverse) portion of the first fluorescent layer on the sheet or ribbon is affixed to the face of the security document. It may be that the portion of the sheet or ribbon that is affixed to the face of security document is a device, a pattern, a complex shape, an irregular shape
- 10 -or an image; for example, it may be a character (e.g. a letter or a number).
It may be that the security transfer is affixed to the face of the security document by stamping a die against the transfer substrate. It may be that the die has a shape corresponding to a portion of the security transfer, so that only that portion of the security transfer is affixed to the face of the security document by the stamping of the die.
It may be that the portion of the sheet or ribbon that is affixed to the face of security document is a device, a pattern, a complex shape, an irregular shape or an image;
for example, it may be a character (e.g. a letter or a number).
It may be that the stamping head is hot during the stamping process. Alternatively, it may be that the stamping head is cold (for example at room temperature) during the stamping process.
It may be that the security transfer is affixed to the face of the security document by applying an adhesive to the face of the security document and/or to the security transfer.
It may be that an adhesive layer is provided as part of the security transfer. It may be that the security transfer comprises a release layer, the second fluorescent layer and the adhesive layer. It may be that the security transfer further includes the UV blocking layer. It may be that the security transfer further includes the first fluorescent layer. It may be that the adhesive layer is the layer of the security transfer furthest from the security transfer substrate. Thus, it may be that the structure of the
It may be that the security transfer is affixed to the face of the security document by stamping a die against the transfer substrate. It may be that the die has a shape corresponding to a portion of the security transfer, so that only that portion of the security transfer is affixed to the face of the security document by the stamping of the die.
It may be that the portion of the sheet or ribbon that is affixed to the face of security document is a device, a pattern, a complex shape, an irregular shape or an image;
for example, it may be a character (e.g. a letter or a number).
It may be that the stamping head is hot during the stamping process. Alternatively, it may be that the stamping head is cold (for example at room temperature) during the stamping process.
It may be that the security transfer is affixed to the face of the security document by applying an adhesive to the face of the security document and/or to the security transfer.
It may be that an adhesive layer is provided as part of the security transfer. It may be that the security transfer comprises a release layer, the second fluorescent layer and the adhesive layer. It may be that the security transfer further includes the UV blocking layer. It may be that the security transfer further includes the first fluorescent layer. It may be that the adhesive layer is the layer of the security transfer furthest from the security transfer substrate. Thus, it may be that the structure of the
- 11 -security transfer is, in order: adhesive layer, first fluorescent layer, UV blocking layer, second fluorescent layer, release layer, transfer substrate.
It may be that a layer of adhesive is applied to the face of the security document substrate.
It may be that the adhesive is applied selectively to one or more portions of the security document and/or of the security transfer, so that only a portion of the security transfer is affixed to the face of the security document by the adhesive. It may be that the portion of the sheet or ribbon that is affixed to the face of security document is a device, a pattern, a complex shape, an irregular shape or an image; for example, it may be a character (e.g. a letter or a number).
It may be that the adhesive is a curable adhesive. It may be that the adhesive is an adhesive cured by ultraviolet light. It may be that the adhesive is a varnish, for example a UV-curable varnish.
It may be that the transfer substrate is a film. It may be that the transfer substrate is a foil.
It may be that the transfer substrate is opaque to visible light. It may be that the transfer substrate is opaque to UV light. It may be that the transfer substrate is opaque to both visible and UV light.
It may be that a plurality of the security transfers is applied, simultaneously or in sequence. It may be that each further security transfer includes a release layer. It may be that each further security transfer includes an adhesive layer. It may be that a further security transfer includes one more layer, which may be any of a fluorescent layer or a
It may be that a layer of adhesive is applied to the face of the security document substrate.
It may be that the adhesive is applied selectively to one or more portions of the security document and/or of the security transfer, so that only a portion of the security transfer is affixed to the face of the security document by the adhesive. It may be that the portion of the sheet or ribbon that is affixed to the face of security document is a device, a pattern, a complex shape, an irregular shape or an image; for example, it may be a character (e.g. a letter or a number).
It may be that the adhesive is a curable adhesive. It may be that the adhesive is an adhesive cured by ultraviolet light. It may be that the adhesive is a varnish, for example a UV-curable varnish.
It may be that the transfer substrate is a film. It may be that the transfer substrate is a foil.
It may be that the transfer substrate is opaque to visible light. It may be that the transfer substrate is opaque to UV light. It may be that the transfer substrate is opaque to both visible and UV light.
It may be that a plurality of the security transfers is applied, simultaneously or in sequence. It may be that each further security transfer includes a release layer. It may be that each further security transfer includes an adhesive layer. It may be that a further security transfer includes one more layer, which may be any of a fluorescent layer or a
- 12 -UV blocking layer. It may be that an additional security transfer includes two fluorescent layers. It may be that an additional security transfer includes a UV blocking layer.
Thus, it may be that the structure of any additional security transfers is substantially identical to the structure of the first security transfer. Alternatively, it may be that any additional security transfer includes only a single layer.
That enables, for example, a multi-colour image to be produced; it may be that at least one, preferably two or more, of the colours are visible only as fluorescent colours. To achieve that using prior-art printing methods would require multiple printing passes and exact registration of each layer one on top of the other (which is difficult or impossible to achieve on fine printed text or multi-tone graduations, or for complex patterns and colours).
Thus, it may be that the method further comprises the step of:
providing a second security transfer, mounted on a transfer substrate, and comprising a fourth fluorescent layer, a UV blocking layer and a third fluorescent layer, the third fluorescent layer being fluorescent in a third visible colour when it is exposed to ultraviolet light, the fourth fluorescent layer being fluorescent in a fourth, different, visible colour when it is exposed to ultraviolet light, and the UV blocking layer being opaque to ultraviolet light but transmitting visible light;
affixing the security transfer to the face of the security document having the affixed layers of the (first)
Thus, it may be that the structure of any additional security transfers is substantially identical to the structure of the first security transfer. Alternatively, it may be that any additional security transfer includes only a single layer.
That enables, for example, a multi-colour image to be produced; it may be that at least one, preferably two or more, of the colours are visible only as fluorescent colours. To achieve that using prior-art printing methods would require multiple printing passes and exact registration of each layer one on top of the other (which is difficult or impossible to achieve on fine printed text or multi-tone graduations, or for complex patterns and colours).
Thus, it may be that the method further comprises the step of:
providing a second security transfer, mounted on a transfer substrate, and comprising a fourth fluorescent layer, a UV blocking layer and a third fluorescent layer, the third fluorescent layer being fluorescent in a third visible colour when it is exposed to ultraviolet light, the fourth fluorescent layer being fluorescent in a fourth, different, visible colour when it is exposed to ultraviolet light, and the UV blocking layer being opaque to ultraviolet light but transmitting visible light;
affixing the security transfer to the face of the security document having the affixed layers of the (first)
- 13 -security transfer, so that the third fluorescent layer of the second security transfer is adjacent to the face of the security document substrate and the fourth fluorescent layer of the second security transfer is furthest from the face of the security document substrate; and removing the transfer substrate from the second security transfer, leaving the fourth fluorescent layer, UV
blocking layer and third fluorescent layer of the second security transfer affixed to the face of the security document.
It may be that the first, second, third and fourth visible colours are all different from each other. It may be that the first and fourth visible colours or the first and third visible colours are the same. It may be that the second and third visible colours or the second and fourth visible colours are the same.
It may be that the layers of the second security transfer at least partially overlap with the layers of the first security transfer on the security document.
The method may further comprise the steps of providing at least one further security transfer mounted on a transfer substrate, and comprising a further distal fluorescent layer, a UV blocking layer and a proximal fluorescent layer, the further fluorescent layers being fluorescent in two further, different, visible colours when exposed to ultraviolet light, and the UV blocking layer being opaque to ultraviolet light but transmitting visible light;
affixing the security transfer to the face of the security document having the affixed layers of the (first)
blocking layer and third fluorescent layer of the second security transfer affixed to the face of the security document.
It may be that the first, second, third and fourth visible colours are all different from each other. It may be that the first and fourth visible colours or the first and third visible colours are the same. It may be that the second and third visible colours or the second and fourth visible colours are the same.
It may be that the layers of the second security transfer at least partially overlap with the layers of the first security transfer on the security document.
The method may further comprise the steps of providing at least one further security transfer mounted on a transfer substrate, and comprising a further distal fluorescent layer, a UV blocking layer and a proximal fluorescent layer, the further fluorescent layers being fluorescent in two further, different, visible colours when exposed to ultraviolet light, and the UV blocking layer being opaque to ultraviolet light but transmitting visible light;
affixing the security transfer to the face of the security document having the affixed layers of the (first)
- 14 -security transfer and the second security transfer, so that the proximal fluorescent layer of the further security transfer is adjacent to the face of the security document substrate and the distal layer of the further security transfer is furthest from the face of the security document substrate; and removing the transfer substrate from the further security transfer, leaving the distal layer, intermediate layer and proximal layer of the further security transfer affixed to the face of the security document.
It may be that none of the layers applied to the security document fluoresce in the same visible colour as any of the other layers. It may be that at least two of the layers fluoresce in the same visible colour. It may be that no two layers from the same security transfer fluoresce in the same visible colours.
It may be that the method further comprises the step of:
providing a further security transfer, mounted on a transfer substrate, and comprising at least one of: a fluorescent layer or a UV blocking layer, the fluorescent layer being fluorescent in a visible colour when exposed to ultraviolet light, and the UV blocking layer being opaque to ultraviolet light but transmitting visible light.
affixing the security transfer to the face of the security document having the affixed layers of any previous security transfer, so that the at least one of the fluorescent layer or the UV blocking layer is adjacent to the face of the security document substrate and,
It may be that none of the layers applied to the security document fluoresce in the same visible colour as any of the other layers. It may be that at least two of the layers fluoresce in the same visible colour. It may be that no two layers from the same security transfer fluoresce in the same visible colours.
It may be that the method further comprises the step of:
providing a further security transfer, mounted on a transfer substrate, and comprising at least one of: a fluorescent layer or a UV blocking layer, the fluorescent layer being fluorescent in a visible colour when exposed to ultraviolet light, and the UV blocking layer being opaque to ultraviolet light but transmitting visible light.
affixing the security transfer to the face of the security document having the affixed layers of any previous security transfer, so that the at least one of the fluorescent layer or the UV blocking layer is adjacent to the face of the security document substrate and,
- 15 -removing the transfer substrate from the further security transfer, leaving the at least one of the fluorescent layer or UV blocking layer of the further security transfer affixed to the face of the security document.
It may be that the security document is a bank note.
It may be that the security document is a passport. It may be that the security document is a paper document. Thus, it may be that the security document substrate is a paper.
It may be that the affixed layers form at least one device, image or character on the face of the security document, for example a letter or a number.
It will be understood that the layers of the security transfer are in the order from furthest to closest to the face of the security substrate when the security transfer is affixed: a transfer substrate (when present), a release layer (if present), a second fluorescent layer, a UV
blocking layer (if present), a first fluorescent layer (if present) and an adhesive layer (if present). It may be that there is no further intermediate layer between any of the transfer substrate, the release layer (if present), the second fluorescent layer, the UV blocking layer, the first fluorescent layer, the adhesive layer and the face of the security document substrate. Alternatively, it may be that there is one or more further intermediate layers between any of the transfer substrate, the release layer (if present) the second fluorescent layer, the UV blocking layer (if present), the first fluorescent layer (if present), the adhesive layer (if present) and the face of the security document substrate.
It may be that the security document is a bank note.
It may be that the security document is a passport. It may be that the security document is a paper document. Thus, it may be that the security document substrate is a paper.
It may be that the affixed layers form at least one device, image or character on the face of the security document, for example a letter or a number.
It will be understood that the layers of the security transfer are in the order from furthest to closest to the face of the security substrate when the security transfer is affixed: a transfer substrate (when present), a release layer (if present), a second fluorescent layer, a UV
blocking layer (if present), a first fluorescent layer (if present) and an adhesive layer (if present). It may be that there is no further intermediate layer between any of the transfer substrate, the release layer (if present), the second fluorescent layer, the UV blocking layer, the first fluorescent layer, the adhesive layer and the face of the security document substrate. Alternatively, it may be that there is one or more further intermediate layers between any of the transfer substrate, the release layer (if present) the second fluorescent layer, the UV blocking layer (if present), the first fluorescent layer (if present), the adhesive layer (if present) and the face of the security document substrate.
- 16 -It will be understood that the layers of the security document are in the order: a security document substrate, an adhesive layer (if present), a first fluorescent layer (if present), a UV blocking layer (if present) and a second fluorescent layer. It may be that there is no further intermediate layer between any of the security document substrate, the adhesive layer (if present), the first fluorescent layer (if present), the UV blocking layer (if present) and the second fluorescent layer. Alternatively, it may be that there is one or more further intermediate layers between any of the security document substrate, the adhesive layer, the first fluorescent layer (if present), the UV
blocking layer (if present) and the second fluorescent layer.
The further intermediate layer may be substantially transparent to UV light, to visible light or to both UV and visible light. It will be understood that the visual effect may be most striking if there are no intermediate layers, or if the intermediate layers are substantially transparent as intermediate layers may cause loss of light intensity, which may weaken the visual effect.
It may be that the first fluorescent layer (if present) and the second fluorescent layers each cover only part of the transfer substrate and are non-coextensive, for example non-overlapping. Therefore, when the illumination of the device changes from reflected to transmitted UV light, the effect perceived by the viewer is that the visible fluorescence 'jumps' from one layer to the other. Such an effect may be even more striking, and easier to detect in an automated fashion, than a colour change. In particular,
blocking layer (if present) and the second fluorescent layer.
The further intermediate layer may be substantially transparent to UV light, to visible light or to both UV and visible light. It will be understood that the visual effect may be most striking if there are no intermediate layers, or if the intermediate layers are substantially transparent as intermediate layers may cause loss of light intensity, which may weaken the visual effect.
It may be that the first fluorescent layer (if present) and the second fluorescent layers each cover only part of the transfer substrate and are non-coextensive, for example non-overlapping. Therefore, when the illumination of the device changes from reflected to transmitted UV light, the effect perceived by the viewer is that the visible fluorescence 'jumps' from one layer to the other. Such an effect may be even more striking, and easier to detect in an automated fashion, than a colour change. In particular,
- 17 -such an effect is apparent regardless of the ability to detect colour.
The colour switch or the 'jumping' effect will also be observed if the security document is turned over, while remaining viewed in reflected light, or if the security document is turned over while remaining viewed in transmitted light.
It may be that the first fluorescent layer and second fluorescent layer overlap. It may be that the first fluorescent layer and the second fluorescent layer are co-extensive. It may be that the first fluorescent layer is covered by the second fluorescent layer.
Thus, it may be that the second fluorescent layer covers the first fluorescent layer, but does not extend substantially beyond the area covered by first fluorescent layer.
According to a second aspect of the invention, there is provided a security transfer including: an optional adhesive layer; a first fluorescent layer, the first fluorescent layer being fluorescent in a first visible colour when it is exposed to ultraviolet light; a UV blocking layer, the UV
blocking layer being opaque to ultraviolet light buy transmitting visible light; a second fluorescent layer, the second fluorescent layer being fluorescent in a second, different, visible colour when it is exposed to ultraviolet light; and an optional release layer, and wherein the UV
blocking layer is sandwiched between the first fluorescent layer and the second fluorescent layer, the optional adhesive layer if present is on the opposite side of the first fluorescent layer to the UV blocking layer, and the
The colour switch or the 'jumping' effect will also be observed if the security document is turned over, while remaining viewed in reflected light, or if the security document is turned over while remaining viewed in transmitted light.
It may be that the first fluorescent layer and second fluorescent layer overlap. It may be that the first fluorescent layer and the second fluorescent layer are co-extensive. It may be that the first fluorescent layer is covered by the second fluorescent layer.
Thus, it may be that the second fluorescent layer covers the first fluorescent layer, but does not extend substantially beyond the area covered by first fluorescent layer.
According to a second aspect of the invention, there is provided a security transfer including: an optional adhesive layer; a first fluorescent layer, the first fluorescent layer being fluorescent in a first visible colour when it is exposed to ultraviolet light; a UV blocking layer, the UV
blocking layer being opaque to ultraviolet light buy transmitting visible light; a second fluorescent layer, the second fluorescent layer being fluorescent in a second, different, visible colour when it is exposed to ultraviolet light; and an optional release layer, and wherein the UV
blocking layer is sandwiched between the first fluorescent layer and the second fluorescent layer, the optional adhesive layer if present is on the opposite side of the first fluorescent layer to the UV blocking layer, and the
- 18 -optional release layer if present is on the opposite side of the second fluorescent layer to the UV blocking layer.
According to a third aspect of the invention, there is provided a mounted security transfer including: an optional adhesive layer; an optional first fluorescent layer, the first fluorescent layer being fluorescent in a first visible colour when it is exposed to ultraviolet light; a second fluorescent layer, the second fluorescent layer being fluorescent in a second, different, visible colour when it is exposed to ultraviolet light; and an optional release layer, and wherein the optional release layer if present is sandwiched between the second fluorescent layer and the transfer substrate, and the optional first fluorescent layer if present is sandwiched between the optional adhesive layer if present and the second fluorescent layer on the opposite side of the second fluorescent layer to the transfer substrate.
According to a fourth aspect of the invention, there is provided a security document manufactured by the method of the first aspect of the invention.
According to a fifth aspect of the invention, there is provided a security document including a security document substrate having a face, a first fluorescent layer, a UV
blocking layer, and a second fluorescent layer, the first fluorescent layer being fluorescent in a first visible colour when it is exposed to ultraviolet light, the UV
blocking layer being opaque to ultraviolet light, but transmitting visible light, and the second fluorescent layer being fluorescent in a second, different, visible colour when it is exposed to ultraviolet light, wherein the second
According to a third aspect of the invention, there is provided a mounted security transfer including: an optional adhesive layer; an optional first fluorescent layer, the first fluorescent layer being fluorescent in a first visible colour when it is exposed to ultraviolet light; a second fluorescent layer, the second fluorescent layer being fluorescent in a second, different, visible colour when it is exposed to ultraviolet light; and an optional release layer, and wherein the optional release layer if present is sandwiched between the second fluorescent layer and the transfer substrate, and the optional first fluorescent layer if present is sandwiched between the optional adhesive layer if present and the second fluorescent layer on the opposite side of the second fluorescent layer to the transfer substrate.
According to a fourth aspect of the invention, there is provided a security document manufactured by the method of the first aspect of the invention.
According to a fifth aspect of the invention, there is provided a security document including a security document substrate having a face, a first fluorescent layer, a UV
blocking layer, and a second fluorescent layer, the first fluorescent layer being fluorescent in a first visible colour when it is exposed to ultraviolet light, the UV
blocking layer being opaque to ultraviolet light, but transmitting visible light, and the second fluorescent layer being fluorescent in a second, different, visible colour when it is exposed to ultraviolet light, wherein the second
- 19 -fluorescent layer is part of a security transfer affixed to the face of the security document, the security transfer having an inner face proximal to the security substrate and an outer face distal to the security substrate and the second fluorescent layer is closer to the outer face of the security transfer than either of the first fluorescent layer or the UV blocking layer.
The security transfer, on the security document substrate, does not include a transfer substrate (which will have been removed during affixing of the security transfer to the security document). It may be that the security transfer, on the security document substrate, does not include a release layer (in which case, the release layer if present initially will have been removed with the transfer substrate). Alternatively, it may be that the security transfer, on the security document substrate, does include a release layer (in which case, the release layer will not have been removed with the transfer substrate).
It will of course be appreciated that features described in relation to one aspect of the present invention may be incorporated into other aspects of the present invention. For example, the security document of the second or third aspects of the invention may incorporate any of the features described with reference to the method of the invention and vice versa.
The security transfer, on the security document substrate, does not include a transfer substrate (which will have been removed during affixing of the security transfer to the security document). It may be that the security transfer, on the security document substrate, does not include a release layer (in which case, the release layer if present initially will have been removed with the transfer substrate). Alternatively, it may be that the security transfer, on the security document substrate, does include a release layer (in which case, the release layer will not have been removed with the transfer substrate).
It will of course be appreciated that features described in relation to one aspect of the present invention may be incorporated into other aspects of the present invention. For example, the security document of the second or third aspects of the invention may incorporate any of the features described with reference to the method of the invention and vice versa.
- 20 -Description of the Drawings Embodiments of the present invention will now be described by way of example only with reference to the accompanying schematic drawings, of which:
Figure 1 is a schematic plan view of a security document according to a first example embodiment of the invention;
Figure 2 is a schematic close-up of a portion of the security document of Fig. 1;
Figure 3 is a security transfer for use in manufacturing the security document of Fig. 1;
Figure 4 is a die for use in a method of manufacturing the security document of Fig. 1; and Figure 5 is a schematic diagram of a step in an alternative process of manufacturing the security document of Fig. 1.
Detailed Description A security document 10 according to an example embodiment of the invention includes several complementary security features. The security document 10 is principally formed from a security document substrate 20, a sheet of paper without optical brighteners. Embedded in the security document substrate 20 are a plurality of security fibres 30, which are small nylon fibres that were mixed into the paper pulp from which the security document substrate 20 was formed, and are hence distributed randomly across the face
Figure 1 is a schematic plan view of a security document according to a first example embodiment of the invention;
Figure 2 is a schematic close-up of a portion of the security document of Fig. 1;
Figure 3 is a security transfer for use in manufacturing the security document of Fig. 1;
Figure 4 is a die for use in a method of manufacturing the security document of Fig. 1; and Figure 5 is a schematic diagram of a step in an alternative process of manufacturing the security document of Fig. 1.
Detailed Description A security document 10 according to an example embodiment of the invention includes several complementary security features. The security document 10 is principally formed from a security document substrate 20, a sheet of paper without optical brighteners. Embedded in the security document substrate 20 are a plurality of security fibres 30, which are small nylon fibres that were mixed into the paper pulp from which the security document substrate 20 was formed, and are hence distributed randomly across the face
- 21 -of the security document substrate 20. Also embedded within the security document substrate 20 is a security thread 40, which runs across the width of the security document substrate 20.
The security document 10 of Fig. 1 includes an affixed security transfer 50. In this example, the security transfer 50 is in the form of characters forming the word "Spinks". The security transfer 50 is substantially invisible when the security document 10 is illuminated by visible light, but it becomes visible under UV light, since it is formed from a plurality of fluorescent layers, as discussed further below.
The affixed security transfer 50 is shown in more detail in Fig. 2. When the security document 10 is viewed and illuminated towards the face of the paper on which the transfer is affixed, the letters "S" 60a, "i" 60b and "k"
fluoresce in red, and the letters "p", 70a, "n" 70b, and "s"
fluoresce in green. The affixed security transfer 50 exhibits a colour switch effect. So when the security document 10 is illuminated towards the other face of the paper, whilst still being viewed towards the face of the paper on which the security transfer 50 is affixed, the colours of the letters 60a-c, 70a-c change. Specifically, in this example, the colours of the two sets of letters 60a-c and 70a-c swap, so that the letters "S" 60a, "i" 60b and "k" fluoresce in green, and the letters "p", 70a, "n" 70b, and "s" fluoresce in red.
If the security document 10 is viewed towards the face of the paper opposite to that on which the security transfer 50 is affixed then the colour combinations are reverse from
The security document 10 of Fig. 1 includes an affixed security transfer 50. In this example, the security transfer 50 is in the form of characters forming the word "Spinks". The security transfer 50 is substantially invisible when the security document 10 is illuminated by visible light, but it becomes visible under UV light, since it is formed from a plurality of fluorescent layers, as discussed further below.
The affixed security transfer 50 is shown in more detail in Fig. 2. When the security document 10 is viewed and illuminated towards the face of the paper on which the transfer is affixed, the letters "S" 60a, "i" 60b and "k"
fluoresce in red, and the letters "p", 70a, "n" 70b, and "s"
fluoresce in green. The affixed security transfer 50 exhibits a colour switch effect. So when the security document 10 is illuminated towards the other face of the paper, whilst still being viewed towards the face of the paper on which the security transfer 50 is affixed, the colours of the letters 60a-c, 70a-c change. Specifically, in this example, the colours of the two sets of letters 60a-c and 70a-c swap, so that the letters "S" 60a, "i" 60b and "k" fluoresce in green, and the letters "p", 70a, "n" 70b, and "s" fluoresce in red.
If the security document 10 is viewed towards the face of the paper opposite to that on which the security transfer 50 is affixed then the colour combinations are reverse from
- 22 -those just described, so, when the security document 10 is illuminated in reflected light (i.e. towards the face of the paper opposite to that on which the transfer is affixed), the letters "S" 60a, "i" 60b and "k" fluoresce in green, and the letters "p", 70a, "n" 70b, and "s" fluoresce in red, and when the security document 10 is illuminated towards the other face of the paper (i.e. in transmitted UV light), the letters "S" 60a, "I" 60b and "k" fluoresce in red, and the letters "p", 70a, "n" 70b, and "s" 70c fluoresce in green.
The security transfer 50, prior to being affixed to the security document substrate 20, is in the form of a ribbon having the cross-sectional structure shown schematically in Fig. 3. The security transfer 50 is mounted on a transfer substrate 90 (which in this example is opaque to light, both visible and UV). There is a release layer 100 on the transfer substrate 90, and a second fluorescent layer 110 on the release layer 100, an opaque, UV blocking, layer 120 on the second fluorescent layer 110, and a first fluorescent layer 130 on the intermediate layer 120. In this example, there is also an adhesive layer (not shown) on the first fluorescent layer. In this example, the release layer 100, second fluorescent layer 110, UV blocking layer 120 and first fluorescent layer 130 are printed successively onto the transfer substrate. Portions of the security transfer 50 are affixed to the security document substrate 20, by one of the methods described in more detail below, to form the letters "S" 60a, "i" 60b and "k" 60c of the device 50.
During the affixing, the transfer substrate 90 and the release layer 100 are removed from the transfer 50, so that the second fluorescent layer 110, the UV blocking layer 120
The security transfer 50, prior to being affixed to the security document substrate 20, is in the form of a ribbon having the cross-sectional structure shown schematically in Fig. 3. The security transfer 50 is mounted on a transfer substrate 90 (which in this example is opaque to light, both visible and UV). There is a release layer 100 on the transfer substrate 90, and a second fluorescent layer 110 on the release layer 100, an opaque, UV blocking, layer 120 on the second fluorescent layer 110, and a first fluorescent layer 130 on the intermediate layer 120. In this example, there is also an adhesive layer (not shown) on the first fluorescent layer. In this example, the release layer 100, second fluorescent layer 110, UV blocking layer 120 and first fluorescent layer 130 are printed successively onto the transfer substrate. Portions of the security transfer 50 are affixed to the security document substrate 20, by one of the methods described in more detail below, to form the letters "S" 60a, "i" 60b and "k" 60c of the device 50.
During the affixing, the transfer substrate 90 and the release layer 100 are removed from the transfer 50, so that the second fluorescent layer 110, the UV blocking layer 120
- 23 -and the first fluorescent layer 130 remain on the security document substrate 20.
When the affixed security transfer 50 is directly illuminated with UV light, the UV light will cause the second fluorescent layer 130 to fluoresce, in red for the letters "S" 60a, "i" 60b and "k" 60c. The UV light does not penetrate the UV blocking layer 120, so the first fluorescent layer 110 does not fluoresce. The UV blocking layer 120 is transparent to the visible fluorescence from the first fluorescent layer 130, and so the letters "S" 60a, "i" 60b and "k" 60c will appear red when viewed from either side of the security document 10.
When however the affixed security transfer 50 is illuminated indirectly, through the security document substrate 20, i.e. from the other side of the security document 10 from the side on which the transfer 50 is affixed, the UV light will cause the first fluorescent fluorescent layer 110, to fluoresce, in green for the letters "S" 60a, "i" 60b and "k" 60c. The UV light is blocked by the opaque, UV blocking, layer 120. Thus the second fluorescent layer 130 does not fluoresce. The UV
blocking layer 120 is transparent to the visible fluorescence from the distal layer 110, and so the letters "S" 60a, "i" 60b and "k" 60c will appear green when viewed from either side of the security document 10.
In this example, the letters "p", 70a, "n" 70b, and "s"
70c are formed from a second security transfer (not shown), identical to the described security transfer 50 save that the second fluorescent layer 110 fluoresces in green, and the first fluorescent layer 130 fluoresces in red.
When the affixed security transfer 50 is directly illuminated with UV light, the UV light will cause the second fluorescent layer 130 to fluoresce, in red for the letters "S" 60a, "i" 60b and "k" 60c. The UV light does not penetrate the UV blocking layer 120, so the first fluorescent layer 110 does not fluoresce. The UV blocking layer 120 is transparent to the visible fluorescence from the first fluorescent layer 130, and so the letters "S" 60a, "i" 60b and "k" 60c will appear red when viewed from either side of the security document 10.
When however the affixed security transfer 50 is illuminated indirectly, through the security document substrate 20, i.e. from the other side of the security document 10 from the side on which the transfer 50 is affixed, the UV light will cause the first fluorescent fluorescent layer 110, to fluoresce, in green for the letters "S" 60a, "i" 60b and "k" 60c. The UV light is blocked by the opaque, UV blocking, layer 120. Thus the second fluorescent layer 130 does not fluoresce. The UV
blocking layer 120 is transparent to the visible fluorescence from the distal layer 110, and so the letters "S" 60a, "i" 60b and "k" 60c will appear green when viewed from either side of the security document 10.
In this example, the letters "p", 70a, "n" 70b, and "s"
70c are formed from a second security transfer (not shown), identical to the described security transfer 50 save that the second fluorescent layer 110 fluoresces in green, and the first fluorescent layer 130 fluoresces in red.
- 24 -Thus, when a face of the security document 10 is viewed in first transmitted and then reflected UV light, or one face is viewed and then the security document is turned over to view the other without changing the direction of the UV
light, the colours of the fluorescence of the two sets of letters 60a-c, 70a-c will appear to swap over, creating a striking and memorable effect.
In an example method of affixing to the security document substrate 20, the security transfer 50 forming the letters "S" 60a, "i" 60b and "k" 60c is stamped onto the security document substrate 20 using a hot die 140 (shown schematically in Fig. 4). The die 140 includes a base 150 and elements 160 that form the mirror image of the letters "S" 60a, "i" 60b and "k" 60c. The die 140 is applied by machine to the transfer substrate 90 of the security transfer 50, to selectively stamp portions of the ribbon of security transfer 50, shown in Fig. 3, onto the security document substrate 20, thereby forming the affixed security transfer 50.
The letters "p", 70a, "n" 70b, and "s" 70c are affixed by the same method, using an appropriate die on the second security transfer.
The stamping with die 140 may be hot- or cold-stamping, both of which are techniques well-known to the person skilled in the art, and are therefore not described further here.
In a further example method, a UV-curable varnish 70 is applied to the security document substrate 20. The varnish 70 is applied selectively, to regions where the letters "S"
60a, "i" 60b and "k" 60c are to be formed. The security
light, the colours of the fluorescence of the two sets of letters 60a-c, 70a-c will appear to swap over, creating a striking and memorable effect.
In an example method of affixing to the security document substrate 20, the security transfer 50 forming the letters "S" 60a, "i" 60b and "k" 60c is stamped onto the security document substrate 20 using a hot die 140 (shown schematically in Fig. 4). The die 140 includes a base 150 and elements 160 that form the mirror image of the letters "S" 60a, "i" 60b and "k" 60c. The die 140 is applied by machine to the transfer substrate 90 of the security transfer 50, to selectively stamp portions of the ribbon of security transfer 50, shown in Fig. 3, onto the security document substrate 20, thereby forming the affixed security transfer 50.
The letters "p", 70a, "n" 70b, and "s" 70c are affixed by the same method, using an appropriate die on the second security transfer.
The stamping with die 140 may be hot- or cold-stamping, both of which are techniques well-known to the person skilled in the art, and are therefore not described further here.
In a further example method, a UV-curable varnish 70 is applied to the security document substrate 20. The varnish 70 is applied selectively, to regions where the letters "S"
60a, "i" 60b and "k" 60c are to be formed. The security
- 25 -transfer 50 is pressed, by passage through rollers, against the security document substrate 20 and the security document and transfer 50 are exposed to UV light, to cure the varnish 70. The transfer 50 is then lifted from the 5 security document substrate 20. The second fluorescent portion 130, opaque portion 120 and first fluorescent portion 110 of the security transfer 50 are retained on the security document substrate 20 in the areas to which the adhesive is applied, thus forming the letters "S" 60a, "i"
10 60b and "k" 60c of the affixed transfer 50, in colour-switch form.
The process is repeated using the second security transfer to form the letters "p", 70a, "n" 70b, and "s" 70c.
Whilst the present invention has been described and illustrated with reference to particular embodiments, it will be appreciated by those of ordinary skill in the art that the invention lends itself to many different variations not specifically illustrated herein.
In some other embodiments the security document substrate is the first fluorescent layer. The security document substrate also fulfils the function of the UV
blocking layer. The security transfer is mounted on a transfer substrate. There is a release layer on the transfer substrate, and a second fluorescent layer on the release layer. The security transfer is affixed to the security document substrate and the transfer substrate and the release layer are removed from the transfer so that the second fluorescent layer remains affixed to the security document.
10 60b and "k" 60c of the affixed transfer 50, in colour-switch form.
The process is repeated using the second security transfer to form the letters "p", 70a, "n" 70b, and "s" 70c.
Whilst the present invention has been described and illustrated with reference to particular embodiments, it will be appreciated by those of ordinary skill in the art that the invention lends itself to many different variations not specifically illustrated herein.
In some other embodiments the security document substrate is the first fluorescent layer. The security document substrate also fulfils the function of the UV
blocking layer. The security transfer is mounted on a transfer substrate. There is a release layer on the transfer substrate, and a second fluorescent layer on the release layer. The security transfer is affixed to the security document substrate and the transfer substrate and the release layer are removed from the transfer so that the second fluorescent layer remains affixed to the security document.
- 26 -Where in the foregoing description, integers or elements are mentioned which have known, obvious or foreseeable equivalents, then such equivalents are herein incorporated as if individually set forth. Reference should be made to the claims for determining the true scope of the present invention, which should be construed so as to encompass any such equivalents. It will also be appreciated by the reader that integers or features of the invention that are described as preferable, advantageous, convenient or the like are optional and do not limit the scope of the independent claims. Moreover, it is to be understood that such optional integers or features, whilst of possible benefit in some embodiments of the invention, may not be desirable, and may therefore be absent, in other embodiments.
Claims (20)
1.A method of manufacturing a security document, the method comprising:
(i) providing a security document substrate having a face;
(ii) providing a first fluorescent layer, the first fluorescent layer being fluorescent in a first visible colour when it is exposed to ultraviolet light;
(iii) providing a UV blocking layer, the UV blocking layer being opaque to ultraviolet light but transmitting visible light;
(iv) providing a security transfer, the security transfer being mounted on a transfer substrate, and comprising a second fluorescent layer, the second fluorescent layer being fluorescent in a second, different, visible colour when it is exposed to ultraviolet light;
(v) affixing the security transfer to the face of the security document such that the transfer substrate is furthest from the face of the security document substrate and the second fluorescent layer is closer to the transfer substrate than are any of: the first fluorescent layer and the UV blocking layer;
(vi) removing the transfer substrate from the security transfer, leaving the second fluorescent layer affixed to the face of the security document.
(i) providing a security document substrate having a face;
(ii) providing a first fluorescent layer, the first fluorescent layer being fluorescent in a first visible colour when it is exposed to ultraviolet light;
(iii) providing a UV blocking layer, the UV blocking layer being opaque to ultraviolet light but transmitting visible light;
(iv) providing a security transfer, the security transfer being mounted on a transfer substrate, and comprising a second fluorescent layer, the second fluorescent layer being fluorescent in a second, different, visible colour when it is exposed to ultraviolet light;
(v) affixing the security transfer to the face of the security document such that the transfer substrate is furthest from the face of the security document substrate and the second fluorescent layer is closer to the transfer substrate than are any of: the first fluorescent layer and the UV blocking layer;
(vi) removing the transfer substrate from the security transfer, leaving the second fluorescent layer affixed to the face of the security document.
2. A method as claimed in claim 1, in which the security transfer includes the first fluorescent layer.
3. A method as claimed in either of claim 1 or claim 2, in which the security transfer includes the UV blocking layer.
4. A method as claimed in claim 1 or claim 3 as dependent on claim 1, in which the first fluorescent layer is provided as a separate layer on the security substrate.
5. A method as claimed in claim 1, claim 2, or claim 4 as dependent on claim 1, in which the UV blocking layer is provided as a separate layer on the security substrate.
6. A method as claimed in any preceding claim, in which the security transfer, prior to the affixing, is in the form of a sheet or ribbon.
7. A method as claimed in any preceding claim, in which the security transfer is affixed to the face of the security document by stamping a die against the transfer substrate.
8. A method as claimed in claim 7, in which the die has a shape corresponding to a portion of the security transfer, so that only that portion of the security transfer is affixed to the face of the security document by the stamping of the die.
9. A method as claimed in any of claims 1 to 5, in which the security transfer is affixed to the face of the security document by applying an adhesive to the face of the security document and/or to the security transfer,
10. A method as claimed in any preceding claim, in which the transfer substrate is a film or a foil.
11. A method as claimed in any preceding claim, in which a plurality of the security transfers is applied, simultaneously or in sequence.
12. A method as claimed in claim 9, in which none of the layers applied to the security document fluoresce in the same visible colour as any of the other layers.
13. A security transfer including: an optional adhesive layer; a first fluorescent layer, the first fluorescent layer being fluorescent in a first visible colour when it is exposed to ultraviolet light; a UV blocking layer, the UV
blocking layer being opaque to ultraviolet light buy transmitting visible light; a second fluorescent layer, the second fluorescent layer being fluorescent in a second, different, visible colour when it is exposed to ultraviolet light; and an optional release layer, and wherein the UV
blocking layer is sandwiched between the first fluorescent layer and the second fluorescent layer, the optional adhesive layer if present is on the opposite side of the first fluorescent layer to the UV blocking layer, and the optional release layer if present is on the opposite side of the second fluorescent layer to the UV blocking layer.
blocking layer being opaque to ultraviolet light buy transmitting visible light; a second fluorescent layer, the second fluorescent layer being fluorescent in a second, different, visible colour when it is exposed to ultraviolet light; and an optional release layer, and wherein the UV
blocking layer is sandwiched between the first fluorescent layer and the second fluorescent layer, the optional adhesive layer if present is on the opposite side of the first fluorescent layer to the UV blocking layer, and the optional release layer if present is on the opposite side of the second fluorescent layer to the UV blocking layer.
14. A mounted security transfer including: an optional adhesive layer; an optional first fluorescent layer, the first fluorescent layer being fluorescent in a first visible colour when it is exposed to ultraviolet light; a second fluorescent layer, the second fluorescent layer being fluorescent in a second, different, visible colour when it is exposed to ultraviolet light; and an optional release layer, and wherein the optional release layer if present is sandwiched between the second fluorescent layer and the transfer substrate, and the optional first fluorescent layer if present is sandwiched between the optional adhesive layer if present and the second fluorescent layer on the opposite side of the second fluorescent layer to the transfer substrate.
15. A security document including a security document substrate having a face, a first fluorescent layer, a UV
blocking layer, and a second fluorescent layer, the first fluorescent layer being fluorescent in a first visible colour when it is exposed to ultraviolet light, the UV
blocking layer being opaque to ultraviolet light, but transmitting visible light, and the second fluorescent layer being fluorescent in a second, different, visible colour when it is exposed to ultraviolet light, wherein the second fluorescent layer is part of a security transfer affixed to the face of the security document, the security transfer having an inner face proximal to the security substrate and an outer face distal to the security substrate and the second fluorescent layer is closer to the outer face of the security transfer than either of the first fluorescent layer or the UV blocking layer.
blocking layer, and a second fluorescent layer, the first fluorescent layer being fluorescent in a first visible colour when it is exposed to ultraviolet light, the UV
blocking layer being opaque to ultraviolet light, but transmitting visible light, and the second fluorescent layer being fluorescent in a second, different, visible colour when it is exposed to ultraviolet light, wherein the second fluorescent layer is part of a security transfer affixed to the face of the security document, the security transfer having an inner face proximal to the security substrate and an outer face distal to the security substrate and the second fluorescent layer is closer to the outer face of the security transfer than either of the first fluorescent layer or the UV blocking layer.
16. A security document according to claim 15, in which the security document substrate is the first fluorescent layer.
17. A security document according to claim 15 or claim 16, in which the security document substrate is the UV blocking layer.
18. A security document according to any of claims 15 to 17, in which the first and second fluorescent layers overlap.
19. A security document according to claim 18 in which the first and second fluorescent layers are co-extensive.
20. A security document according to any of claims 15 to 18 in which the first fluorescent layer and second fluorescent layer are disjoint.
Applications Claiming Priority (5)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GBGB1309174.9A GB201309174D0 (en) | 2013-05-21 | 2013-05-21 | Improvements in and relating to security documents |
| GB1309174.9 | 2013-05-21 | ||
| EP13178422.5 | 2013-07-29 | ||
| EP13178422 | 2013-07-29 | ||
| PCT/GB2014/051565 WO2014188194A1 (en) | 2013-05-21 | 2014-05-21 | Improvements in and relating to security documents |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2949593A1 CA2949593A1 (en) | 2014-11-27 |
| CA2949593C true CA2949593C (en) | 2021-04-27 |
Family
ID=50841877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2949593A Active CA2949593C (en) | 2013-05-21 | 2014-05-21 | Improvements in and relating to security documents. |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP2999598B1 (en) |
| AU (1) | AU2014270135B2 (en) |
| CA (1) | CA2949593C (en) |
| PL (1) | PL2999598T3 (en) |
| WO (1) | WO2014188194A1 (en) |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2300596B (en) * | 1995-05-10 | 1998-11-04 | Portals Ltd | Composite material having fluorescent features |
| TWI255251B (en) * | 2003-11-13 | 2006-05-21 | Bobst Sa | Method for positioning and transferring at least two different patterns from a supply strip |
| GB2452078B (en) * | 2007-08-23 | 2009-12-23 | Rue De Int Ltd | Security devices for security substrates |
-
2014
- 2014-05-21 EP EP14727033.4A patent/EP2999598B1/en active Active
- 2014-05-21 CA CA2949593A patent/CA2949593C/en active Active
- 2014-05-21 PL PL14727033T patent/PL2999598T3/en unknown
- 2014-05-21 AU AU2014270135A patent/AU2014270135B2/en active Active
- 2014-05-21 WO PCT/GB2014/051565 patent/WO2014188194A1/en active Application Filing
Also Published As
| Publication number | Publication date |
|---|---|
| PL2999598T3 (en) | 2020-09-07 |
| CA2949593A1 (en) | 2014-11-27 |
| EP2999598B1 (en) | 2019-12-04 |
| EP2999598A1 (en) | 2016-03-30 |
| AU2014270135B2 (en) | 2018-07-26 |
| WO2014188194A1 (en) | 2014-11-27 |
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