EP1439964B1 - Multilayer body with a first laser-sensitive layer and a second laser-sensitive layer and method for generation of a multilayer image in said multilayer body - Google Patents

Multilayer body with a first laser-sensitive layer and a second laser-sensitive layer and method for generation of a multilayer image in said multilayer body Download PDF

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Publication number
EP1439964B1
EP1439964B1 EP02742734A EP02742734A EP1439964B1 EP 1439964 B1 EP1439964 B1 EP 1439964B1 EP 02742734 A EP02742734 A EP 02742734A EP 02742734 A EP02742734 A EP 02742734A EP 1439964 B1 EP1439964 B1 EP 1439964B1
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EP
European Patent Office
Prior art keywords
laser
layer
sensitive
colorant
induced
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.)
Expired - Lifetime
Application number
EP02742734A
Other languages
German (de)
French (fr)
Other versions
EP1439964B8 (en
EP1439964A1 (en
Inventor
Norbert Lutz
Gerhard Zinner
Matthias Schumacher
Ulrich Knaack
Dirk Fischer
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.)
Unica Technology AG
Leonhard Kurz Stiftung and Co KG
Original Assignee
Orga Systems GmbH
Leonhard Kurz GmbH and Co KG
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
Priority claimed from PCT/DE2001/004154 external-priority patent/WO2002036356A1/en
Application filed by Orga Systems GmbH, Leonhard Kurz GmbH and Co KG filed Critical Orga Systems GmbH
Publication of EP1439964A1 publication Critical patent/EP1439964A1/en
Publication of EP1439964B1 publication Critical patent/EP1439964B1/en
Application granted granted Critical
Publication of EP1439964B8 publication Critical patent/EP1439964B8/en
Anticipated expiration legal-status Critical
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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
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/28—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used using thermochromic compounds or layers containing liquid crystals, microcapsules, bleachable dyes or heat- decomposable compounds, e.g. gas- liberating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M5/00—Duplicating or marking methods; Sheet materials for use therein
    • B41M5/26—Thermography ; Marking by high energetic means, e.g. laser otherwise than by burning, and characterised by the material used
    • B41M5/34—Multicolour thermography
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/324—Reliefs
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/328—Diffraction gratings; Holograms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/351—Translucent or partly translucent parts, e.g. windows
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/30—Identification or security features, e.g. for preventing forgery
    • B42D25/36—Identification or security features, e.g. for preventing forgery comprising special materials
    • B42D25/378—Special inks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/405—Marking
    • B42D25/41—Marking using electromagnetic radiation
    • 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
    • B42D25/43—Marking by removal of material
    • B42D25/435—Marking by removal of material using electromagnetic radiation, e.g. laser
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B42D25/455—Associating two or more layers using heat
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B42D25/46—Associating two or more layers using pressure
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B42—BOOKBINDING; ALBUMS; FILES; SPECIAL PRINTED MATTER
    • B42D—BOOKS; BOOK COVERS; LOOSE LEAVES; PRINTED MATTER CHARACTERISED BY IDENTIFICATION OR SECURITY FEATURES; PRINTED MATTER OF SPECIAL FORMAT OR STYLE NOT OTHERWISE PROVIDED FOR; DEVICES FOR USE THEREWITH AND NOT OTHERWISE PROVIDED FOR; MOVABLE-STRIP WRITING OR READING APPARATUS
    • B42D25/00—Information-bearing cards or sheet-like structures characterised by identification or security features; Manufacture thereof
    • B42D25/40—Manufacture
    • B42D25/45—Associating two or more layers
    • B42D25/465—Associating two or more layers using chemicals or adhesives
    • B42D25/47—Associating two or more layers using chemicals or adhesives using adhesives

Definitions

  • the invention relates to a multilayered body as a multilayer film, preferably a transfer film or laminating film, or laminated as a laminated composite of at least one overlay film and inlet, with a first layer comprising laser-sensitive material, and a second layer comprising a laser-sensitive material, which are arranged overlapping one another at least in regions.
  • the invention further relates to a method for producing a multi-layer image in such a multi-layer body.
  • Multi-layer body of the type mentioned are from the US 4,523,777 known.
  • an identification card is described as a multi-layer body, which has superimposed color layers of different colors, which are selectively removed by means of laser irradiation or changed in color.
  • EP 0 327 508 A1 describes a method of laser marking organic material comprising at least one radiation-sensitive, bleachable additive and at least one less radiation-sensitive, non-discolourable compound.
  • plastic bodies that consist of laser-sensitive material.
  • various embodiments of plastic bodies are known and designed as a solid body or coating, each containing a mixture of different pigments.
  • laser treatment a color marking on the plastic body or in the coating.
  • WO 98/19868 describes a method that works with special yellow, magenta and cyan pigments, which are activated in a first step by UV light and bleached only in a subsequent second step.
  • WO 94/12352 It is also known, on a plastic body containing a pigment mixture and may be formed as a solid body and as a coating, by laser treatment with different Wavelength to produce colorful color markings. The color formation takes place in that the pigments change their color by color change during the laser treatment.
  • a method is known in which a laser-sensitive dye A and a laser-insensitive dye B are contained in two separate superimposed layers or alternatively in a common layer, and the dye A is bleached by laser treatment. With the laser treatment, a color mark is thus obtained which, however, only involves a color change of the dye A, so that only the maximum two-color image is obtained.
  • a laser marking process for use in surface pigment coating wherein pigments of the pigment coating at different temperatures change their internal molecular structure and provide different colors. With the laser irradiation, the specific surface temperatures are locally achieved, whereby colored laser markings are obtained.
  • the GB 2 240 948 A also describes laser marking of identity cards. Laser marking is done here by removing different layers of paint. The resulting laser marking appears as a colored mark.
  • the DE 41 31 964 A1 describes laser inscriptions of a multilayer film with metal layer and hologram structure. The labeling is done by partially destroying the hologram-bearing metal layer.
  • a hot stamping foil with a hologram structure is known, which is individualized by laser treatment for the purpose of protection against counterfeiting.
  • a change of material or color or a removal of partial regions in the layer structure of the film takes place.
  • EP 0 219 011 B1 describes a special procedure for laser marking ID cards.
  • black markings are introduced in different transparent layers of the card by means of the laser.
  • paralaxe images are obtained in this way.
  • the invention has for its object to provide a multi-layer body, which ensures particularly high security against counterfeiting by laser treatment and enables special laser-induced markings.
  • the object of the invention is also to provide a method for producing novel complex laser-induced markings.
  • the invention solves the problem with the multi-layer body according to claim 1 and the method for producing a laser-induced multi-layer image in such a multi-layer body according to the method claim 9.
  • the multi-layer body has a first laser-sensitive layer and a second laser-sensitive layer in which different formed laser-induced image components are created, the possibility is created to produce a complex composite laser-induced multi-layer image.
  • the laser-sensitive layer with the laser-sensitive colorant it is possible to produce a colorful laser-induced image component which can be configured as a multicolor image or full color image when using a corresponding laser-sensitive colorant mixture of two or three bleachable colorant components.
  • Another laser-sensitive material can be used in the other laser-sensitive layer, ie a different colorant mixture or else a material doped with carbon or carbon black, in which a different color marking, preferably multicolored color image or a black marking, preferably a gray-scale image, can be produced during the laser treatment.
  • the different laser-sensitive layers can be arranged more or less preferably one above the other only overlapping one another in overlapping regions and more or less possibly only transparent in regions.
  • specific different image components can be generated laser-induced, which can co-operate to form an arbitrarily complex multi-layer image.
  • Multi-layer images with particularly interesting optical effects become possible if, in addition to the several laser-sensitive layers in the layer structure, diffraction and / or hologram structures are also included which, for example at different viewing angles, result in different optical effects in connection with the different laser-induced image components arranged in the different layers ,
  • the laser-sensitive layers can be formed so that they are sensitive only under certain laser conditions, eg only at a specific laser wavelength or angle of incidence.
  • a special background layer is arranged as an intermediate layer between the laser-sensitive layers, which acts in the manner of a barrier layer for certain laser irradiation, eg depending on the laser wavelength, the angle of incidence, etc.
  • this background layer acting as a barrier layer can also be formed only in regions, ie only under a subregion of the laser-sensitive layer arranged above, preferably only in a region which lies below the laser-induced marking.
  • the hot stamping foil shown in FIG. 1 is a multilayer body having two laser-sensitive layers 4, which are formed on both sides of a reflection layer 5r. By laser treatment of this multilayer body can different laser-induced markings in the laser-sensitive layers are introduced, so that a composite laser-induced multi-layer image is generated.
  • the laminated body shown in FIG. 4 also has two laser-sensitive layers, namely the layer 4, which is arranged on the underside of the upper overlay film 30 in a hot stamping film applied there, and the layer 32, which is formed as a separate doped overlay film.
  • the laser-sensitive layers 4 formed on both sides of the reflection layer 5r may be identical, ie the reflection layer is then in this laser-sensitive overall layer arranged. However, the laser-sensitive layers can also be designed differently. In adjacent areas of the laser-sensitive layer 4 and of the reflection layer 5r, a diffraction structure 5b is formed. Alternatively, the structure 5b may also be formed as a hologram structure. Increased security against forgery results in the exemplary embodiment in that two laser-sensitive layers adjoin the diffraction or hologram structure, which may be identical or different.
  • the lacquer layer 5, which is optional, is in this case formed as a transparent layer or as a light backup layer.
  • the lacquer layer 5 and the adhesive layer 6 may be dispensed with and the second laser-sensitive layer 4 shown in FIG. 1 below the reflection layer 5r may be formed as a laser-sensitive adhesive layer.
  • Fig. 2 shows an embodiment of a laminating film with an order of layers corresponding to the structure of the hot stamping foil. It comprises a so-called overlay sheet 30, a laser-sensitive layer 40, a background layer-forming intermediate layer 50, which is optional, and an adhesive layer 60, which is also optional.
  • the laser-sensitive layer 40 is arranged in a similar manner as the laser-sensitive layer 4 on both sides of the reflective layer 50r, wherein it is provided in a similar manner as in Fig. 1 that the two laser-sensitive layers are formed differently or the same. 1, a diffraction and / or hologram structure 50b is also provided in the laminating film in FIG. 2, and likewise in the region of the two laser-sensitive layers 40 and the intermediate reflection layer 50r.
  • laser-induced image components which are present in different layers are respectively produced in the superimposed laser-sensitive layers.
  • the laser treatment is preferably carried out after the film in question has been applied to the substrate, ie by irradiating the film applied to the substrate from the outside.
  • the film is laser-treated before application. In this case, then the laser irradiation can be done from different sides of the film.
  • Different laser-induced image components in the superimposed laser-sensitive layers are obtained by virtue of the fact that the laser-sensitive layers have different laser-sensitive material and thus the laser-induced at different material-specific laser conditions Components in the different laser-sensitive layers are generated.
  • the upper laser-sensitive layer can be treated separately to produce there a specific laser-induced image component without the radiation enters the lower laser-sensitive layer. In this way, it is thus also possible to treat the superposed laser-sensitive layers separately even if they are formed of the same laser-sensitive material.
  • two laser-sensitive layers 4, 4a are likewise provided. However, these are separated by a background layer 5 arranged therebetween.
  • the background layer is a highly reflective layer for the laser radiation used in the laser treatment.
  • the layer is also non-transmissive and absorbing with respect to the non-reflected portion of the laser radiation, so that in the laser treatment to produce the laser-induced mark in the upper laser-sensitive layer 4 no laser radiation enters the underlying laser-sensitive layer 4a.
  • the background layer 5 is arranged below the laser-sensitive layer 4 exclusively in the region in which a laser-induced image component is to be produced in the laser-sensitive layer 4.
  • the background layer 5 is not formed, ie in this area is a for the laser radiation permeable material or preferably the laser-sensitive material of the lower laser-sensitive layer 4a is arranged. In these areas, in which the background layer is thus not formed, the laser-induced image component can be generated in the lower laser-sensitive layer 4a by laser irradiation.
  • the two laser-sensitive layers 4, 4a are preferably formed from different laser-sensitive material, for which different material-specific laser treatment conditions apply. In this way it is also possible that during the generation of the laser-induced marking in the lower laser-sensitive layer 4a, a laser-induced change in the upper laser-sensitive layer 4 does not take place simultaneously.
  • a further background layer 5a is arranged on the underside of the lower laser-sensitive layer 4a. This background layer 5a prevents laser radiation from reaching the substrate during the laser treatment.
  • the embodiment in FIG. 4 is a body laminated from various overlay foils and inlets.
  • the upper overlay film has on its underside a layer structure consisting of a lacquer layer 5c, a reflection layer 5r, a laser-sensitive layer 4, a background layer 5 and an adhesive layer 6.
  • the reflection layer 5r and the laser-sensitive layer 4 is a diffraction and / or hologram structure 5b formed.
  • These layers applied to the underside of the overlay film 30 are layers of a hot stamping foil which are there on the underside of the overlay foil is applied.
  • the overlay film 32 arranged under the overlay film 30 is designed as a laser-sensitive film. It therefore forms a second laser-sensitive layer.
  • the laser-sensitive material is formed as carbon and / or carbon black-doped material. It is material that carbonizes when exposed to laser, so that in this layer formed by the overlay film 32, a laser-induced image component by blackening.
  • the laser conditions eg variation of the laser power and / or laser wavelength, a grayscale image can be generated.
  • an inlet 90 and below another inlet 90 is arranged under the doped overlay film 32.
  • These inlets can preferably be made of paper material, but also of plastic material, preferably as inlet foils.
  • an overlay film 30 and on this another overlay film 30 is applied on the underside of the lower inlet 90.
  • the laser treatment for producing the different laser-induced image constituents in the laser-sensitive layers 4 and 32 takes place in exemplary embodiments in a corresponding manner as in FIGS. 1 to 3.
  • the laser-sensitive material is a three-component mixture having a cyan pigment component, a magenta pigment component and a yellow pigment component.
  • a blue or green or red color mark is produced by irradiating that spot with a particular laser wavelength that bleaches a particular pigment component.
  • the yellow pigment component may be bleached.
  • blue laser light is used. Bleaching requires a certain minimum intensity. Furthermore, a certain pulse duration must not be exceeded.
  • the magenta pigment component may be bleached. For this purpose, green laser light is used.
  • red laser light is used.
  • this point is laser-treated in a second step, with a laser wavelength with which one of the not yet bleached at this point pigment components is bleached.
  • a blue color mark has been formed in the first step, at this point the cyan pigment component and the magenta pigment component are unbleached.
  • the magenta pigment component must be bleached in this second step. This is done with green laser light. This results in a cyan mark at this point.
  • the blue mark produced in the first step must be treated with red laser light.
  • the cyan pigment is bleached at this point, so that the magenta pigment remains unbleached at this point. This results in the magenta marking at this point.
  • a green color marking produced in the first step which is formed from unbleached cyan pigment and yellow pigment remaining there, can produce a cyan-colored marking or a yellow-colored marking by treatment with blue laser light or red laser light.
  • a red color marking produced in the first step can be converted into a yellow or magenta marking in the second step by laser treatment in the second step with green laser light or blue laser light.
  • this spot must be treated with a laser beam whose wavelength is adjusted to bleach the unbleached pigment component remaining at that point after the second step, i. the yellow color mark must be bleached with blue laser light, the magenta mark with green light, and the cyan mark with red laser light.
  • Laser treatment can also be used to produce color markers or a full-color image in the colorant or the colorants in the laser-sensitive layer by color change.
  • the laser treatment can be carried out in a corresponding manner with successive process steps.
  • a colorant i. Coloring substances are pigments in question. These are usually insoluble and are usually inorganic substances.
  • the color change takes place in each case under specific laser conditions, which are then used in the laser treatment in the individual steps.
  • the bleaching and color conversion process described can also be used if the laser-sensitive material consists of only one or two colorant components. It is also possible to use other colorant components and also other laser conditions, in particular other laser wavelength ranges, in the laser treatment.
  • the laser treatment is usually carried out on the applied film on the substrate. Alternatively, however, it can also be carried out before the film is applied, by irradiating the film alone, specifically if the protective layer 3 or any other layer has, for example, a background layer 5 as a layer which is not or only partially transparent to laser radiation or one for laser radiation in the certain wavelength range is formed non-transparent layer or an additional UV-absorbing protective layer is provided.
  • the laser treatment is then carried out, preferably before the application of the film by the laser beam on the back of the film, ie on the lower Background layer 5 or the adhesive layer 6 is directed and thus the laser-sensitive layer 4 is thus treated from the other side to generate the color marks in the same way.
  • the background layer 5 and the adhesive layer 6 are transparent or at least partially transparent for the laser radiation in question in these applications.
  • a multilayer data carrier which contains at least two different laser-sensitive layers, wherein a laser-sensitive layer 1 is preferably laser-personalized in a multicolor manner and a further laser-sensitive layer 2 is preferably monochromatic laser-personalizable.
  • the laser-sensitive materials can be set in such a way that a marking can be achieved by means of laser radiation of a defined wavelength and intensity in both materials.
  • the laser-sensitive layers preferably lie over one another over part of the area.
  • This optical barrier layer 3 is a reflective layer in a preferred embodiment, a diffusely reflecting layer. It preferably contains a sufficient proportion of white pigment and thus prevents penetration of the laser light into the underlying layers. This is the prerequisite for the arrangement according to the invention of the different laser-personalisable layers.
  • the multi-color laserpersonalisierbare layer 1 can be above the monochrome laserpersonalisierbaren layer 2, without at the color laser personalization an unintentional carbonation in the underlying monochrome laserpersonalisierbaren layer 2 takes place.
  • the optical barrier layer can be incorporated in various ways as an additional layer.
  • the optical barrier layer is applied to one of the cover layers in decorative printing.
  • FIG. 1 shows a preferred construction of a data carrier.
  • the optical barrier layer can also be arranged above the laser-sensitive layers and thus cause partial coverage of the laser-sensitive layers.
  • this optical barrier layer is then carried out as decorative printing, preferably in the form of line patterns such as guilloche.
  • the image information of the decor print is then in the laserpersonalisierbaren layers after the laser personalization transmitted here that the laser-personalized image information is interrupted by the image information of the optical barrier layer.
  • color laser personalization and laser personalization in grayscale in a data carrier takes place in the form that the different laserpersonalisierbaren layers are only partially arranged on top of each other. This results in different possibilities of integrated color laser personalization.
  • Fig. 6 shows the possibilities of laser marking on a preferred construction of a data carrier.
  • Fig. 7 shows how integrating picture elements can be achieved by the combination of laser personalization in color with the classical gray scale laser.
  • the absorption of the laser-personalisable layers is adjusted for this purpose so that the laser power required for bleaching is sufficient to carbonize in the monochrome laser-personalisable layer additionally used in the document.
  • the monochrome laser-personalisable layer 2 lies underneath the multicolor laser-personalisable layer 1 and if it is covered by the optical barrier layer 3 only over part of the surface, this structure allows picture elements, such as lines or alphanumeric characters, which are lasered beyond the boundary of the optical barrier layer 3, cause a carbonation of the background.
  • continuous picture elements can be generated with a change in the type of marking within the element. If the boundary of the optical barrier layer 3 coincides with the boundary of the multi-colored laser-personalisable layer 1, a change from colorful to achromatic arises. This continuous image information has an integrating effect.
  • integrating picture elements are possible, which are achieved by combining laser personalization in color with other graphic elements.
  • the transparency of the multicolor laser-personalisable layer increases with increasing bleaching.
  • layout elements such as guilloches
  • layout elements such as guilloches
  • picture elements such as printed lines, which are only partially covered by the multicolor laser-personalisable layer 1, appear as integrating elements after the color laser personalization. Integrating elements such as these, which extend beyond the edge of a personalized feature, greatly complicate the corruption of the volume.
  • the additional layer allows a specific adjustment of the brightness of the background, regardless of the carrier material used.
  • the carrier material used e.g., glass, glass, or the like.
  • the subject matter of the invention is a multilayer data carrier which contains at least two different laser-sensitive layers, wherein a laser-sensitive layer can be laser-personalized in multiple colors and a further laser-sensitive layer can be monochromaticly laser-personalized. These laser-sensitive layers lie over one another over part of the surface, and preferably the multi-colored laser-personalisable layer lies above the monochrome laser-personalisable layer.
  • the laser-sensitive layers may be designed such that in a laser marking step with the same wavelength and energy Laser radiation in both the multicolor laserpersonalisierbaren and in the monochrome laserpersonalisierbaren layer a respective mark can be achieved.
  • a layer which is not permeable to the laser radiation is at least partially arranged between these laser-sensitive layers.
  • the non-transmissive to the laser radiation layer is a reflective layer, which may be a diffusely reflecting layer in a preferred embodiment and contains a sufficient proportion of an additive that reflects or scatters the laser light.
  • the laser personalization can take place in an upper laser-personalisable layer, preferably in a multicolor laser-personalisable layer, without a laser-personalisable layer lying beneath this layer being changed by the laser radiation, in that the laser personalization takes place where the laser-sensitive layers are penetrated by a layer which is not transparent to the laser radiation are optically separated from each other.
  • the laser personalization can be carried out with a laser beam both in an upper laserpersonalisierbaren layer, preferably in a multicolored laserpersonalisierbaren layer, as well as in a lying below this layer laserpersonalisierbaren layer by the laser personalization takes place where the laser-sensitive layers not by a non-transmissive to the laser radiation Layer are optically separated from each other.
  • Laser personalization can be carried out with a laser beam both in an upper laser-personalisable layer, preferably in a multicolor laser-personalisable layer, and in a laser-personalisable layer located below this layer, by laser personalization in such a way that graphic image elements are projected over the partial surfaces of the respective laser-personalisable layer Layer, preferably the multi-colored laserpersonalisierbaren layer, are arranged out, so that within the picture element a change from multi-colored to monochrome representation is achieved.
  • the laser personalization can be performed with a laser beam in a laser personalisierbaren layer by the laser personalization takes place in such a way that graphical image elements on the faces of the above the laserpersonalisierbaren layer arranged optical barrier layer, are arranged out, so that within the laserpersonalisierbaren layer interrupting the so generated graphic image elements is achieved.
  • interrupting elements in the sense of an optical barrier layer printed elements such as, for example, guilloches can preferably be arranged above the laser-personalisable layer.
  • the laser personalization can be performed with a laser beam in a multicolor laser personalisable layer so that design elements preferably appear printed elements such as guilloches printed on layers beneath the multicolor laser personalisable layer, for example on the substrate, after the color laser in color image, by increasing the transparency of the multicolor laser-personalisable layer by the process of laser marking.
  • An essential advantage of the invention is that the known laser personalization in gray scale is combined with the new method of color laser personalization.
  • the security of documents can be significantly increased by the combination in the manner described.

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Abstract

A multilayer body is disclosed, comprising two laser-sensitive layers (4, 32). Said multilayer body is a laminated body of overlay films (30, 32), inlays (90, 90) and further overlay films (30,30). The upper overlay film (30) comprises a layer structure applied to the underside thereof by application of a hot-stamp film. The layer structure comprises a lacquer layer (50), a reflection layer (5r), a laser-sensitive layer (4), a background layer (5) and an adhesive layer (6). A diffraction and/or hologram structure (5b) is embodied in the lacquer layer (5c), the reflection layer (5r) and the laser-sensitive layer (4). The second laser-sensitive layer is embodied as a carbon-doped overlay film (32). A laser-induced, preferably coloured image component can be generated in the upper laser-sensitive layer (4) and a further, preferably grey-scale image generated in the carbon-doped laser-sensitive layer (32) thereunder by means of laser treatment. A laser-induced multilayer image can thus be produced.

Description

Die Erfindung betrifft einen Mehrschichtenkörper als Mehrschichtenfolie, vorzugsweise Transferfolie oder Laminierfolie, oder als Schichtenverbund laminiert aus mindestens einer Overlayfolie und Inlet ausgebildet, mit einer lasersensitives Material aufweisenden ersten Schicht, und einer lasersensitives Material aufweisenden zweiten Schicht, die zumindest bereichsweise einander überlappend angeordnet sind. Die Erfindung betrifft ferner ein Verfahren zur Herstellung eines Mehrschichtenbildes in einem solchen Mehrschichtenkörper.The invention relates to a multilayered body as a multilayer film, preferably a transfer film or laminating film, or laminated as a laminated composite of at least one overlay film and inlet, with a first layer comprising laser-sensitive material, and a second layer comprising a laser-sensitive material, which are arranged overlapping one another at least in regions. The invention further relates to a method for producing a multi-layer image in such a multi-layer body.

Mehrschichtkörper der eingangs genannten Art sind aus der US 4,523,777 bekannt. Hier ist eine Ausweiskarte als Mehrschichtkörper beschrieben, welche übereinander angeordnete Farbschichten unterschiedlicher Farbe aufweist, die mittels Laserbestrahlung selektiv entfernt oder farblich verändert werden.Multi-layer body of the type mentioned are from the US 4,523,777 known. Here, an identification card is described as a multi-layer body, which has superimposed color layers of different colors, which are selectively removed by means of laser irradiation or changed in color.

EP 0 327 508 A1 beschreibt ein Verfahren zur Laserbeschriftung von organischem Material, das mindestens einen strahlungsempfindlichen, ausbleichbaren Zusatzstoff und mindestens eine weniger strahlungsempfindliche, nicht verfärbbare Verbindung aufweist. EP 0 327 508 A1 describes a method of laser marking organic material comprising at least one radiation-sensitive, bleachable additive and at least one less radiation-sensitive, non-discolourable compound.

Es sind weitere Körper bekannt, die aus lasersensitivem Material bestehen. Zum Beispiel aus der WO 96/35585 sind verschiedene Ausführungen von Kunststoffkörpern bekannt und zwar als massiver Körper oder Beschichtung ausgebildet, die jeweils ein Gemisch aus verschiedenen Pigmenten enthalten. Durch Laserbehandlung erfolgt eine Farbmarkierung auf dem Kunststoffkörper bzw. in der Beschichtung.
In der WO 98/19868 ist ein Verfahren beschrieben, daß mit speziellen Gelb-, Magenta- und Cyanpigmenten arbeitet, die in einem ersten Schritt über UV-Licht aktivierbar sind und erst in einem nachfolgenden zweiten Schritt gebleicht werden.There are other bodies known that consist of laser-sensitive material. For example from the WO 96/35585 various embodiments of plastic bodies are known and designed as a solid body or coating, each containing a mixture of different pigments. By laser treatment, a color marking on the plastic body or in the coating.
In the WO 98/19868 describes a method that works with special yellow, magenta and cyan pigments, which are activated in a first step by UV light and bleached only in a subsequent second step.

In der DE 199 55 338 ist ebenfalls ein Verfahren zur Erzeugung von Farbmarkierungen durch Laserbehandlung bei Einsatz eines Gemischs aus Cyanpigment, Magentapigment und Gelbpigment bekannt, wobei diese Pigmente durch rotes Laserlicht, grünes Laserlicht und blaues Laserlicht selektiv gebleicht werden. Dieses Verfahren ist für den Einsatz eines Kunststoffkörpers beschrieben, der aus einem Material mit der betreffenden Pigmentmischung hergestellt ist.In the DE 199 55 338 Also, there is known a method of producing color markers by laser treatment using a mixture of cyan pigment, magenta pigment and yellow pigment, which pigments are selectively bleached by red laser light, green laser light and blue laser light. This method is described for the use of a plastic body made of a material with the relevant pigment mixture.

Aus der WO 94/12352 ist es ebenfalls bekannt, auf einen Kunststoffkörper, der eine Pigmentmischung enthält und als massiver Körper und als Beschichtung ausgebildet sein kann, durch Laserbehandlung mit unterschiedlicher Wellenlänge bunte Farbmarkierungen zu erzeugen. Die Farbbildung erfolgt dadurch, daß die Pigmente bei der Laserbehandlung ihre Farbe durch Farbumschlag ändern. Aus der EP 0 327 508 ist ein Verfahren bekannt, bei dem ein laserempfindlicher Farbstoff A und ein laserunempfindlicher Farbstoff B in zwei separaten übereinanderliegenden Schichten oder alternativ in einer gemeinsamen Schicht enthalten sind und durch Laserbehandlung der Farbstoff A gebleicht wird. Mit der Laserbehandlung wird damit eine Farbmarkierung erhalten, die jedoch nur eine Farbveränderung des Farbstoffs A beinhaltet, um also das lediglich ein maximal Zweifarbenbild erhalten wird.From the WO 94/12352 It is also known, on a plastic body containing a pigment mixture and may be formed as a solid body and as a coating, by laser treatment with different Wavelength to produce colorful color markings. The color formation takes place in that the pigments change their color by color change during the laser treatment. From the EP 0 327 508 For example, a method is known in which a laser-sensitive dye A and a laser-insensitive dye B are contained in two separate superimposed layers or alternatively in a common layer, and the dye A is bleached by laser treatment. With the laser treatment, a color mark is thus obtained which, however, only involves a color change of the dye A, so that only the maximum two-color image is obtained.

Aus der EP 0 190 997 B1 ist ein Verfahren bekannt, bei dem in einer als Überzug eines Metallplättchens ausgebildeten Kunststoffschicht oder in einer Kunststoffplatte ein Zusatz enthalten ist, der sich bei Laserbehandlung verfärben soll und zwar entweder durch Farbumschlag von einer Farbe in eine andere oder Umwandlung in Schwarz.From the EP 0 190 997 B1 For example, a method is known in which an additive is included in a plastic layer formed as a coating of a metal plate or in a plastic plate, which is to discolor during laser treatment, either by color change from one color to another or conversion to black.

Aus der DE 37 38 330 A1 ist ein Laserbeschriftungsverfahren zur Anwendung bei Oberflächenpigmentüberzug bekannt, wobei Pigmente des Pigmentüberzugs bei unterschiedlichen Temperaturen ihren inneren Molekularaufbau ändern und unterschiedlichen Farben liefern. Mit der Lasereinstrahlung werden lokal die spezifischen Oberflächentemperaturen erzielt, wodurch farbige Lasermarkierungen erhalten werden.From the DE 37 38 330 A1 For example, a laser marking process for use in surface pigment coating is known wherein pigments of the pigment coating at different temperatures change their internal molecular structure and provide different colors. With the laser irradiation, the specific surface temperatures are locally achieved, whereby colored laser markings are obtained.

Die GB 2 240 948 A beschreibt ebenfalls das Laserbeschriften von Ausweiskarten. Die Laserbeschriftung erfolgt hier durch Abtragen unterschiedlicher Farbschichten. Die dabei erhaltene Lasermarkierung erscheint als farbige Markierung.The GB 2 240 948 A also describes laser marking of identity cards. Laser marking is done here by removing different layers of paint. The resulting laser marking appears as a colored mark.

Die DE 41 31 964 A1 beschreibt Laserbeschriftungen einer Mehrschichtenfolie mit Metallschicht und Hologrammstruktur. Das Beschriften erfolgt durch bereichsweise Zerstörung der das Hologramm tragenden Metallschicht.The DE 41 31 964 A1 describes laser inscriptions of a multilayer film with metal layer and hologram structure. The labeling is done by partially destroying the hologram-bearing metal layer.

Aus der EP 0 420 261 ist eine Heißprägefolie mit Hologrammstruktur bekannt, die über Laserbehandlung zwecks Fälschungssicherheit individualisiert wird. Es erfolgt mittels des Laserstrahls eine Material- oder Farbänderung oder eine Entfernung von Teilbereichen im Schichtenaufbau der Folie.From the EP 0 420 261 a hot stamping foil with a hologram structure is known, which is individualized by laser treatment for the purpose of protection against counterfeiting. By means of the laser beam, a change of material or color or a removal of partial regions in the layer structure of the film takes place.

EP 0 219 011 B1 beschreibt ein spezielles Verfahren zur Laserbeschriftung von Ausweiskarten. Bei diesem Verfahren werden in verschiedenen transparenten Schichten der Karte mittels des Lasers schwarze Markierungen eingebracht. In den miteinander zusammenwirkenden transparenten Schichten werden auf diese Weise paralaxe Bilder erhalten. EP 0 219 011 B1 describes a special procedure for laser marking ID cards. In this method black markings are introduced in different transparent layers of the card by means of the laser. In the interacting transparent layers paralaxe images are obtained in this way.

Der Erfindung liegt die Aufgabe zugrunde, einen Mehrschichtenkörper zu schaffen, der durch Laserbehandlung besonders hohe Fälschungssicherheit gewährleistet und besondere laserinduzierte Markierungen ermöglicht. Aufgabe der Erfindung ist es auch ein Verfahren zu schaffen zur Erzeugung neuartiger komplexer laserinduzierter Markierungen.The invention has for its object to provide a multi-layer body, which ensures particularly high security against counterfeiting by laser treatment and enables special laser-induced markings. The object of the invention is also to provide a method for producing novel complex laser-induced markings.

Die Erfindung löst die Aufgabe mit dem Mehrschichtenkörper gemäß Anspruch 1 und dem Verfahren zur Herstellung eines laserinduzierten Mehrschichtenbildes in einem solchen Mehrschichtenkörper gemäß dem Verfahrensanspruch 9.The invention solves the problem with the multi-layer body according to claim 1 and the method for producing a laser-induced multi-layer image in such a multi-layer body according to the method claim 9.

Dadurch, daß der Mehrschichtenkörper eine erste lasersensitive Schicht und eine zweite lasersensitive Schicht aufweist, in denen unterschiedlich ausgebildete laserinduzierte Bildbestandteile erzeugbar sind, wird die Möglichkeit geschaffen, ein komplex zusammengesetztes laserinduziertes Mehrschichtenbild zu erzeugen. In der lasersensitiven Schicht mit dem lasersensitiven Farbmittel wird es möglich, einen bunten laserinduzierten Bildbestandteil zu erzeugen, der bei Einsatz eines entsprechenden lasersensitiven Farbmittelgemischs aus zwei oder drei bleichbaren Farbmittelkomponenten als Vielfarbenbild bzw. Vollfarbenbild ausgestaltet werden kann. In der anderen lasersensitiven Schicht kann ein anderes lasersensitives Material eingesetzt werden, d.h. ein anderes Farbmittelgemisch oder auch ein Kohlenstoff oder Ruß dotiertes Material, in welchem bei der Laserbehandlung eine andere Farbmarkierung, vorzugsweise mehrfarbiges Farbbild bzw. eine Schwarzmarkierung, vorzugsweise ein Graustufenbild erzeugbar ist.Characterized in that the multi-layer body has a first laser-sensitive layer and a second laser-sensitive layer in which different formed laser-induced image components are created, the possibility is created to produce a complex composite laser-induced multi-layer image. In the laser-sensitive layer with the laser-sensitive colorant, it is possible to produce a colorful laser-induced image component which can be configured as a multicolor image or full color image when using a corresponding laser-sensitive colorant mixture of two or three bleachable colorant components. Another laser-sensitive material can be used in the other laser-sensitive layer, ie a different colorant mixture or else a material doped with carbon or carbon black, in which a different color marking, preferably multicolored color image or a black marking, preferably a gray-scale image, can be produced during the laser treatment.

Die verschiedenen lasersensitiven Schichten können mehr oder weniger vorzugsweise nur bereichsweise überlappend übereinander angeordnet sein und mehr oder weniger ggf. nur bereichsweise transparent ausgebildet sein. Bei jeweils spezifischer Steuerung der Laserbehandlung der verschiedenen lasersensitiven Schichten können spezifische unterschiedliche Bildbestandteile laserinduziert erzeugt werden, die zu einem beliebig komplexen Mehrschichtenbild zusammenwirken können.The different laser-sensitive layers can be arranged more or less preferably one above the other only overlapping one another in overlapping regions and more or less possibly only transparent in regions. With specific control of the laser treatment of the different laser-sensitive layers, specific different image components can be generated laser-induced, which can co-operate to form an arbitrarily complex multi-layer image.

Mehrschichtenbilder mit besonders interessanten optischen Effekten werden möglich, wenn zusätzlich zu den mehreren lasersensitiven Schichten in dem Schichtenaufbau auch Diffraktions- und/oder Hologrammstrukturen enthalten sind, die z.B. in unterschiedlichen Betrachtungswinkeln unterschiedliche optische Effekte in Verbindung mit den in den verschiedenen Schichten angeordneten unterschiedlichen laserinduzierten Bildbestandteilen ergeben.Multi-layer images with particularly interesting optical effects become possible if, in addition to the several laser-sensitive layers in the layer structure, diffraction and / or hologram structures are also included which, for example at different viewing angles, result in different optical effects in connection with the different laser-induced image components arranged in the different layers ,

Im nachfolgenden werden bevorzugte Ausführungsbeispiele unter Bezugnahme auf die beigefügten Figuren näher erläutert.In the following preferred embodiments are explained in more detail with reference to the accompanying figures.

Um möglichst selektiv in den einzelnen lasersensitiven Schichten bei der Laserbestrahlung die gewünschte laserinduzierte Markierung herstellen zu können, können die lasersensitiven Schichten so ausgebildet werden, daß sie nur unter bestimmten Laserbedingungen sensitiv sind, z.B. nur bei bestimmter Laserwellenlänge oder Einstrahlwinkel. Es ist erfindungsgemäß eine spezielle Hintergrundschicht als Zwischenschicht zwischen den lasersensitiven Schichten angeordnet, die in Art einer Sperrschicht wirkt für bestimmte Lasereinstrahlung, z.B. abhängig von der Laserwellenlänge, dem Einstrahlwinkel usw. Diese als Sperrschicht wirkende Hintergrundschicht kann bei bevorzugten Ausführungen auch nur bereichsweise ausgebildet sein, d.h. nur unter einem Teilbereich der darüber angeordneten lasersensitiven Schicht, vorzugsweise lediglich in einem Bereich, der unter der laserinduzierten Markierung liegt. Über nur bereichsweise Anordnung solcher Sperr- und Zwischenschichten können auch spezielle weitere Effekte erhalten werden, nämlich daß z.B. bei der Laserbestrahlung in Bereichen mit Zwischenschicht lediglich in der oberen lasersensitiven Schicht eine laserinduzierte Markierung und in Bereichen ohne Zwischenschicht in beiden lasersensitiven Schichten sodann übereinander liegende unterschiedliche laserinduzierte Markierungen als kombinierte Markierungen erhalten werden. Besonders interessante optische Effekte werden erhalten, wenn die lasersensitiven Materialien der Schichten unterschiedlich sind, so daß z.B. in der einen Schicht eine Farbmarkierung und in der anderen Schicht eine Schwarzmarkierung, vorzugsweise Graustufenbild erzeugt wird.In order to be able to produce the desired laser-induced marking as selectively as possible in the individual laser-sensitive layers during the laser irradiation, the laser-sensitive layers can be formed so that they are sensitive only under certain laser conditions, eg only at a specific laser wavelength or angle of incidence. According to the invention, a special background layer is arranged as an intermediate layer between the laser-sensitive layers, which acts in the manner of a barrier layer for certain laser irradiation, eg depending on the laser wavelength, the angle of incidence, etc. In the case of preferred embodiments, this background layer acting as a barrier layer can also be formed only in regions, ie only under a subregion of the laser-sensitive layer arranged above, preferably only in a region which lies below the laser-induced marking. Specific only further effects can be obtained by way of arrangement of such barrier layers and intermediate layers, namely, laser-induced marking in areas with intermediate layer only in the upper laser-sensitive layer and laser-induced marking in areas without intermediate layer in both laser-sensitive layers Markings are obtained as combined marks. Particularly interesting optical effects are obtained when the laser-sensitive materials of the layers are different, so that, for example, a color marking is produced in one layer and a black marking, preferably a grayscale image, in the other layer.

Es zeigen:Show it:

Fig. 1Fig. 1
eine Schnittansicht eines Ausführungsbeispiels einer Transferfolie mit zwei lasersensitiven Schichten;a sectional view of an embodiment of a transfer film with two laser-sensitive layers;
Fig. 2Fig. 2
eine Schnittansicht eines Ausführungsbeispiels einer Laminierfolie mit entsprechendem Aufbau wie die Transferfolie in Fig. 1;a sectional view of an embodiment of a laminating film with a corresponding structure as the transfer sheet in Fig. 1;
Fig. 3Fig. 3
eine Schnittansicht eines weiteren Ausführungsbeispiels einer Transferfolie mit zwei lasersensitiven Schichten mit abgewandelter Schichtenfolge;a sectional view of another embodiment of a transfer film with two laser-sensitive layers with a modified layer sequence;
Fig. 4Fig. 4
eine Explosionsdarstellung eines laminierten Körpers aus mehreren Overlayfolien und Inlets, wobei ebenfalls zwei lasersensitive Schichten vorhanden sind;an exploded view of a laminated body of multiple overlay films and inlets, wherein also two laser-sensitive layers are present;
Fig. 5Fig. 5
eine Schnittansicht eines weiteren Ausführungsbeispiels;a sectional view of another embodiment;
Fig. 6Fig. 6
eine Schnittansicht des Ausführungsbeispiels in Fig. 5 zur Veranschaulichung der Laserbehandlung;a sectional view of the embodiment in Figure 5 for illustrating the laser treatment.
Fig. 7Fig. 7
eine Draufansicht auf ein laserinduziertes Bild des Ausführungsbeispiels in Fig. 5 und 6.a top view of a laser-induced image of the embodiment in Fig. 5 and 6th

Bei der in Fig. 1 dargestellten Heißprägefolie handelt es sich um einen Mehrschichtenkörper mit zwei lasersensitiven Schichten 4, die beiderseits einer Reflexionsschicht 5r ausgebildet sind. Durch Laserbehandlung dieses Mehrschichtenkörpers können unterschiedliche laserinduzierte Markierungen in den lasersensitiven Schichten eingebracht werden, so daß ein zusammengesetztes laserinduziertes Mehrschichtenbild erzeugt wird. Entsprechendes gilt für die in Fig. 2 dargestellte Laminierfolie, die in ihrem Schichtenaufbau der Transferfolie in Fig. 1 entspricht. Und auch entsprechendes gilt für die in Fig. 3 dargestellte Heißprägefolie, die abgewandelten Schichtenaufbau, jedoch ebenfalls zwei lasersensitive Schichten 4, 4a aufweist. Auch der in Fig. 4 dargestellte laminierte Körper weist zwei lasersensitive Schichten auf, nämlich die Schicht 4, die an der Unterseite der oberen Overlayfolie 30 in einer dort aufgebrachten Heißprägefolie angeordnet ist und die Schicht 32, die als separate dotierte Overlayfolie ausgebildet ist.The hot stamping foil shown in FIG. 1 is a multilayer body having two laser-sensitive layers 4, which are formed on both sides of a reflection layer 5r. By laser treatment of this multilayer body can different laser-induced markings in the laser-sensitive layers are introduced, so that a composite laser-induced multi-layer image is generated. The same applies to the laminating film shown in FIG. 2, which corresponds in its layer structure to the transfer film in FIG. The same applies to the hot stamping foil shown in FIG. 3, which has a modified layer structure but also two laser-sensitive layers 4, 4a. The laminated body shown in FIG. 4 also has two laser-sensitive layers, namely the layer 4, which is arranged on the underside of the upper overlay film 30 in a hot stamping film applied there, and the layer 32, which is formed as a separate doped overlay film.

Im folgenden wird der Aufbau der einzelnen Mehrschichtenkörper in Verbindung mit den Figuren im Detail beschrieben und auch die Laserbehandlung, mit der ein als Vollfarbenbild ausgebildeter laserinduzierter Bildbestandteil erzeugbar ist. Ferner wird das Verfahren beschrieben, wie bei einer anderen lasersensitiven Schicht ein Graustufenbild als laserinduzierter Bildbestandteil erzeugbar ist.In the following, the structure of the individual multilayer bodies in connection with the figures will be described in detail and also the laser treatment with which a laser-induced image component formed as a full-color image can be produced. Furthermore, the method is described how a grayscale image can be generated as a laser-induced image component in another laser-sensitive layer.

Bei der Folie in Fig. 1 liegen die Schichten in folgender Reihenfolge:In the film in Fig. 1, the layers are in the following order:

Trägerschicht 1, Ablöseschicht 2, Schutzschicht 3, lasersensitive Schicht 4, Reflexionsschicht 5r, lasersensitive Schicht 4, zusätzliche Lackschicht 5 und Kleberschicht 6. Die beiderseits zur Reflexionsschicht 5r ausgebildeten lasersensitiven Schichten 4 können identisch ausgebildet sein, d.h. die Reflexionsschicht ist dann in dieser lasersensitiven Gesamtschicht angeordnet. Die lasersensitiven Schichten können jedoch auch unterschiedlich ausgebildet sein. In einander angrenzenden Bereichen der lasersensitiven Schicht 4 und der Reflexionsschicht 5r ist eine Diffraktionsstruktur 5b ausgebildet. Alternativ kann die Struktur 5b auch als Hologrammstruktur ausgebildet sein. Erhöhte Fälschungssicherheit ergibt sich bei dem Ausführungsbeispiel dadurch, daß zwei lasersensitive Schichten an die Diffraktions- bzw. Hologrammstruktur angrenzen, die gleich oder verschieden ausgebildet sein können. Die Lackschicht 5, die optional ist, ist hierbei als transparente Schicht bzw. als helle Backupschicht ausgebildet. Alternativ können auch die Lackschicht 5 und die Kleberschicht 6 entfallen und die in Fig. 1 unter der Reflexionsschicht 5r dargestellte zweite lasersensitive Schicht 4 als lasersensitive Kleberschicht ausgebildet sein.Carrier layer 1, release layer 2, protective layer 3, laser-sensitive layer 4, reflection layer 5r, laser-sensitive layer 4, additional lacquer layer 5 and adhesive layer 6. The laser-sensitive layers 4 formed on both sides of the reflection layer 5r may be identical, ie the reflection layer is then in this laser-sensitive overall layer arranged. However, the laser-sensitive layers can also be designed differently. In adjacent areas of the laser-sensitive layer 4 and of the reflection layer 5r, a diffraction structure 5b is formed. Alternatively, the structure 5b may also be formed as a hologram structure. Increased security against forgery results in the exemplary embodiment in that two laser-sensitive layers adjoin the diffraction or hologram structure, which may be identical or different. The lacquer layer 5, which is optional, is in this case formed as a transparent layer or as a light backup layer. Alternatively, the lacquer layer 5 and the adhesive layer 6 may be dispensed with and the second laser-sensitive layer 4 shown in FIG. 1 below the reflection layer 5r may be formed as a laser-sensitive adhesive layer.

Fig. 2 zeigt ein Ausführungsbeispiel einer Laminierfolie mit einer Reihenfolge der Schichten entsprechend dem Aufbau der Heißprägefolie. Sie umfaßt eine sogenannte Overlayfolie 30, eine lasersensitive Schicht 40, eine Hintergrundschicht bildende Zwischenschicht 50, die optional ist und eine Kleberschicht 60, die ebenfalls optional ist. Die lasersensitive Schicht 40 ist in entsprechender Weise wie die lasersensitive Schicht 4 beiderseits der Reflexionsschicht 50r angeordnet, wobei in entsprechender Weise wie bei Fig. 1 vorgesehen ist, daß die beiden lasersensitiven Schichten unterschiedlich oder gleich ausgebildet sind. In entsprechender Weise wie bei der Heißprägefolie in Fig. 1 ist auch bei der Laminierfolie in Fig. 2 eine Diffraktions- und/oder Hologrammstruktur 50b vorgesehen und zwar ebenfalls im Bereich der beiden lasersensitiven Schichten 40 und der dazwischenliegenden Reflexionsschicht 50r.Fig. 2 shows an embodiment of a laminating film with an order of layers corresponding to the structure of the hot stamping foil. It comprises a so-called overlay sheet 30, a laser-sensitive layer 40, a background layer-forming intermediate layer 50, which is optional, and an adhesive layer 60, which is also optional. The laser-sensitive layer 40 is arranged in a similar manner as the laser-sensitive layer 4 on both sides of the reflective layer 50r, wherein it is provided in a similar manner as in Fig. 1 that the two laser-sensitive layers are formed differently or the same. 1, a diffraction and / or hologram structure 50b is also provided in the laminating film in FIG. 2, and likewise in the region of the two laser-sensitive layers 40 and the intermediate reflection layer 50r.

Bei der Laserbehandlung der Heißprägefolie in Fig. 1 bzw. Laminierfolie in Fig. 2 werden in den übereinander liegenden lasersensitiven Schichten jeweils laserinduzierte Bildbestandteile erzeugt, die in unterschiedlichen Schichten vorliegen. Die Laserbehandlung erfolgt vorzugsweise, nachdem die betreffende Folie auf das Substrat aufgebracht ist, indem also die auf dem Substrat aufgebrachte Folie von außen her bestrahlt wird. Alternativ ist es jedoch auch möglich, daß die Folie vor dem Aufbringen laserbehandelt wird. In diesem Falle kann dann die Laserbestrahlung von unterschiedlichen Seiten der Folie erfolgen.In the laser treatment of the hot stamping foil in FIG. 1 or laminating foil in FIG. 2, laser-induced image components which are present in different layers are respectively produced in the superimposed laser-sensitive layers. The laser treatment is preferably carried out after the film in question has been applied to the substrate, ie by irradiating the film applied to the substrate from the outside. Alternatively, however, it is also possible that the film is laser-treated before application. In this case, then the laser irradiation can be done from different sides of the film.

Unterschiedliche laserinduzierte Bildbestandteile in den übereinander liegenden lasersensitiven Schichten werden dadurch erhalten, daß die lasersensitiven Schichten unterschiedliches lasersensitives Material aufweisen und somit bei unterschiedlichen materialspezifischen Laserbedingungen die laserinduzierten Bestandteile in den unterschiedlichen lasersensitiven Schichten erzeugbar sind. Alternativ ist es aber auch möglich durch Variation des Einstrahlwinkels lediglich die obere oder die untere lasersensitive Schicht zu behandeln. Diese Möglichkeit ergibt sich dadurch, daß die Reflexionsschicht 5r für die Laserstrahlung bei Senkrechteinstrahlung durchlässig ist, jedoch bei Einstrahlung unter einem spitzen Winkel nicht oder weniger durchlässig ist. Unterschiede ergeben sich auch für die Durchstrahlung der Diffraktionsstruktur, so daß also durch entsprechende Einstellung des Einstrahlwinkels der Laserstrahlung die obere lasersensitive Schicht separat behandelt werden kann, um dort einen spezifischen laserinduzierten Bildbestandteil zu erzeugen, ohne daß die Strahlung in die untere lasersensitive Schicht gelangt. Auf diese Weise ist es somit auch möglich, die übereinander liegenden lasersensitiven Schichten separat zu behandeln, selbst wenn sie aus dem gleichen lasersensitiven Material ausgebildet sind.Different laser-induced image components in the superimposed laser-sensitive layers are obtained by virtue of the fact that the laser-sensitive layers have different laser-sensitive material and thus the laser-induced at different material-specific laser conditions Components in the different laser-sensitive layers are generated. Alternatively, however, it is also possible to treat only the upper or the lower laser-sensitive layer by varying the angle of incidence. This possibility results from the fact that the reflection layer 5r is permeable to the laser radiation at perpendicular irradiation, but is not or less permeable to radiation at an acute angle. Differences also arise for the irradiation of the diffraction structure, so that therefore by appropriate adjustment of the angle of incidence of the laser radiation, the upper laser-sensitive layer can be treated separately to produce there a specific laser-induced image component without the radiation enters the lower laser-sensitive layer. In this way, it is thus also possible to treat the superposed laser-sensitive layers separately even if they are formed of the same laser-sensitive material.

Bei dem Ausführungsbeispiel der Heißprägefolie in Fig. 3 sind ebenfalls zwei lasersensitive Schichten 4, 4a vorgesehen. Diese sind jedoch durch eine dazwischen angeordnete Hintergrundschicht 5 voneinander getrennt. Bei der Hintergrundschicht handelt es sich um eine für die bei der Laserbehandlung eingesetzte Laserstrahlung im hohen Maße reflektierende Schicht. Die Schicht ist außerdem hinsichtlich des nicht reflektierten Anteils der Laserstrahlung nicht durchlässig und absorbierend, so daß bei der Laserbehandlung zur Erzeugung der laserinduzierten Markierung in der oberen lasersensitiven Schicht 4 keine Laserstrahlung in die darunter liegende lasersensitive Schicht 4a gelangt. Die Hintergrundschicht 5 ist unter der lasersensitiven Schicht 4 ausschließlich in dem Bereich angeordnet, in dem in der lasersensitiven Schicht 4 ein laserinduzierter Bildbestandteil erzeugt werden soll. In dem Bereich außerhalb, ist die Hintergrundschicht 5 nicht ausgebildet, d.h. in diesem Bereich ist ein für die Laserstrahlung durchlässiges Material oder vorzugsweise das lasersensitive Material der unteren lasersensitiven Schicht 4a angeordnet. In diesen Bereichen, in denen die Hintergrundschicht also nicht ausgebildet sind, kann durch Laserbestrahlung der laserinduzierte Bildbestandteil in der unteren lasersensitiven Schicht 4a erzeugt werden.In the embodiment of the hot stamping foil in FIG. 3, two laser-sensitive layers 4, 4a are likewise provided. However, these are separated by a background layer 5 arranged therebetween. The background layer is a highly reflective layer for the laser radiation used in the laser treatment. The layer is also non-transmissive and absorbing with respect to the non-reflected portion of the laser radiation, so that in the laser treatment to produce the laser-induced mark in the upper laser-sensitive layer 4 no laser radiation enters the underlying laser-sensitive layer 4a. The background layer 5 is arranged below the laser-sensitive layer 4 exclusively in the region in which a laser-induced image component is to be produced in the laser-sensitive layer 4. In the area outside, the background layer 5 is not formed, ie in this area is a for the laser radiation permeable material or preferably the laser-sensitive material of the lower laser-sensitive layer 4a is arranged. In these areas, in which the background layer is thus not formed, the laser-induced image component can be generated in the lower laser-sensitive layer 4a by laser irradiation.

Vorzugsweise sind die beiden lasersensitiven Schichten 4, 4a aus unterschiedlichem lasersensitiven Material ausgebildet, für die unterschiedliche materialspezifische Laserbehandlungsbedingungen gelten. Auf diese Weise ist es auch möglich, daß während der Erzeugung der laserinduzierten Markierung in der unteren lasersensitiven Schicht 4a nicht gleichzeitig eine laserinduzierte Veränderung in der oberen lasersensitiven Schicht 4 erfolgt.The two laser-sensitive layers 4, 4a are preferably formed from different laser-sensitive material, for which different material-specific laser treatment conditions apply. In this way it is also possible that during the generation of the laser-induced marking in the lower laser-sensitive layer 4a, a laser-induced change in the upper laser-sensitive layer 4 does not take place simultaneously.

Zum Schutz des Substrats vor einfallendem Laserlicht ist an der Unterseite der unteren lasersensitiven Schicht 4a eine weitere Hintergrundschicht 5a angeordnet. Diese Hintergrundschicht 5a verhindert, daß bei der Laserbehandlung Laserstrahlung bis zum Substrat gelangt.To protect the substrate from incident laser light, a further background layer 5a is arranged on the underside of the lower laser-sensitive layer 4a. This background layer 5a prevents laser radiation from reaching the substrate during the laser treatment.

Bei dem Ausführungsbeispiel in Fig. 4 handelt es sich um einen aus diversen Overlayfolien und Inlets laminierten Körper. Die obere Overlayfolie weist an ihrer Unterseite einen Schichtenaufbau auf, bestehend aus einer Lackschicht 5c, einer Reflexionsschicht 5r, einer lasersensitiven Schicht 4, einer Hintergrundschicht 5 und einer Klebeschicht 6. In der Lackschicht 5c, der Reflexionsschicht 5r und der lasersensitiven Schicht 4 ist eine Diffraktions- und/oder Hologrammstruktur 5b ausgebildet.The embodiment in FIG. 4 is a body laminated from various overlay foils and inlets. The upper overlay film has on its underside a layer structure consisting of a lacquer layer 5c, a reflection layer 5r, a laser-sensitive layer 4, a background layer 5 and an adhesive layer 6. In the lacquer layer 5c, the reflection layer 5r and the laser-sensitive layer 4 is a diffraction and / or hologram structure 5b formed.

Diese an der Unterseite der Overlayfolie 30 aufgebrachten Schichten sind Schichten einer Heißprägefolie, die dort auf der Unterseite der Overlayfolie aufgebracht ist. Die unter der Overlayfolie 30 angeordnete Overlayfolie 32 ist als lasersensitive Folie ausgebildet. Sie bildet also eine zweite lasersensitive Schicht. Bei dem dargestellten Ausführungsbeispiel ist das lasersensitive Material als Kohlenstoff und/oder Ruß dotiertes Material ausgebildet. Es handelt sich um Material, das bei Lasereinwirkung karbonisiert, so daß in dieser durch die Overlayfolie 32 gebildeten Schicht ein laserinduzierter Bildbestandteil durch Schwärzen. Durch Variation der Laserbedingungen, z.B. Variation der Laserleistung und/oder Laserwellenlänge kann ein Graustufenbild erzeugt werden.These layers applied to the underside of the overlay film 30 are layers of a hot stamping foil which are there on the underside of the overlay foil is applied. The overlay film 32 arranged under the overlay film 30 is designed as a laser-sensitive film. It therefore forms a second laser-sensitive layer. In the illustrated embodiment, the laser-sensitive material is formed as carbon and / or carbon black-doped material. It is material that carbonizes when exposed to laser, so that in this layer formed by the overlay film 32, a laser-induced image component by blackening. By varying the laser conditions, eg variation of the laser power and / or laser wavelength, a grayscale image can be generated.

Unter der dotierten Overlayfolie 32 ist ein Inlet 90 und darunter ein weiteres Inlet 90 angeordnet. Diese Inlets können vorzugsweise aus Papiermaterial, aber auch aus Kunststoffmaterial, vorzugsweise als Inletfolien ausgebildet sein. Auf der Unterseite des unteren Inlets 90 ist eine Overlayfolie 30 und auf dieser eine weitere Overlayfolie 30 aufgebracht.Under the doped overlay film 32, an inlet 90 and below another inlet 90 is arranged. These inlets can preferably be made of paper material, but also of plastic material, preferably as inlet foils. On the underside of the lower inlet 90, an overlay film 30 and on this another overlay film 30 is applied.

Die Laserbehandlung zur Erzeugung der unterschiedlichen laserinduzierten Bildbestandteile in den lasersensitiven Schichten 4 und 32 erfolgt in Ausführungsbeispielen in entsprechender Weise wie bei den Figuren 1 bis 3.The laser treatment for producing the different laser-induced image constituents in the laser-sensitive layers 4 and 32 takes place in exemplary embodiments in a corresponding manner as in FIGS. 1 to 3.

Im folgenden wird noch im einzelnen beschrieben, wie in einer lasersensitiven Schicht, die aus einem Farbmittelgemisch aus drei lasersensitiven Farbmittelkomponenten besteht, durch laserinduziertes Bleichen ein Vollfarbenbildbestandteil erzeugt werden kann. Bei dem lasersensitiven Material handelt es sich um ein Dreikomponentengemisch mit einer Cyanpigmentkomponente, einer Magentapigmentkomponente und einer Gelbpigmentkomponente.The following describes in more detail how, in a laser-sensitive layer consisting of a colorant mixture of three laser-sensitive colorant components, a full-color image component can be produced by laser-induced bleaching. The laser-sensitive material is a three-component mixture having a cyan pigment component, a magenta pigment component and a yellow pigment component.

Beim Bleichen wird in einem ersten Schritt eine blaue oder grüne oder rote Farbmarkierung erzeugt, indem diese Stelle mit einer bestimmten Laserwellenlänge bestrahlt wird, mit der eine bestimmte Pigmentkomponente gebleicht wird.In bleaching, in a first step, a blue or green or red color mark is produced by irradiating that spot with a particular laser wavelength that bleaches a particular pigment component.

Um die Farbe Blau zu erzeugen darf nur die Gelbpigmentkomponente gebleicht werden. Hierfür wird blaues Laserlicht eingesetzt. Für das Bleichen ist eine bestimmte Mindestintensität erforderlich. Ferner darf eine gewisse Pulsdauer nicht überschritten werden. Um im ersten Schritt eine grüne Farbmarkierung zu erhalten darf nur die Magentapigmentkomponente gebleicht werden. Hierfür wird grünes Laserlicht eingesetzt. Um im ersten Schritt eine rote Farbmarkierung zu erhalten, darf nur die Cyanpigmentkomponente gebleicht werden. Hierfür wird rotes Laserlicht eingesetzt.To produce the color blue, only the yellow pigment component may be bleached. For this purpose, blue laser light is used. Bleaching requires a certain minimum intensity. Furthermore, a certain pulse duration must not be exceeded. In order to obtain a green color marking in the first step, only the magenta pigment component may be bleached. For this purpose, green laser light is used. To get a red color mark in the first step, only the cyan pigment component should be bleached. For this purpose, red laser light is used.

Um an dieser Stelle eine Farbmarkierung in der Farbe Cyan oder Magenta oder Gelb zu erzeugen, wird diese Stelle in einem zweiten Schritt laserbehandelt, und zwar mit einer Laserwellenlänge, mit der eine der an dieser Stelle noch nicht gebleichten Pigmentkomponenten gebleicht wird. Wenn im ersten Schritt eine blaue Farbmarkierung erzeugt worden ist, sind an dieser Stelle die Cyanpigmentkomponente und die Magentapigmentkomponente ungebleicht. Um die Farbe Cyan an dieser Stelle zu erzeugen, muss die MagentaPigmentkomponente in diesem zweiten Schritt gebleicht werden. Dies erfolgt mit grünem Laserlicht. Es ergibt sich damit an dieser Stelle eine cyanfarbene Markierung.In order to produce at this point a color marking in the color cyan or magenta or yellow, this point is laser-treated in a second step, with a laser wavelength with which one of the not yet bleached at this point pigment components is bleached. When a blue color mark has been formed in the first step, at this point the cyan pigment component and the magenta pigment component are unbleached. To make the color cyan at this point, the magenta pigment component must be bleached in this second step. This is done with green laser light. This results in a cyan mark at this point.

Falls in dem zweiten Schritt anstelle dieser cyanfarbenen Markierung eine magentafarbene Markierung erhalten werden soll, muss die im ersten Schritt erzeugte blaue Farbmarkierung mit rotem Laserlicht behandelt werden.If, in the second step, a magenta mark is to be obtained instead of this cyan mark, the blue mark produced in the first step must be treated with red laser light.

Dadurch wird das Cyanpigment an dieser Stelle gebleicht, so dass also das Magenta-Pigment ungebleicht an dieser Stelle verbleibt. Es ergibt sich damit die magentafarbene Markierung an dieser Stelle.As a result, the cyan pigment is bleached at this point, so that the magenta pigment remains unbleached at this point. This results in the magenta marking at this point.

In entsprechender Weise lassen sich aus einer im ersten Schritt erzeugten grünen Farbmarkierung, die aus dort verbliebenem ungebleichten Cyanpigment und Gelbpigment gebildet wird, eine cyanfarbene Markierung oder eine gelbfarbene Markierung erzeugen, und zwar durch Behandlung mit blauem Laserlicht bzw. rotem Laserlicht.In a corresponding manner, a green color marking produced in the first step, which is formed from unbleached cyan pigment and yellow pigment remaining there, can produce a cyan-colored marking or a yellow-colored marking by treatment with blue laser light or red laser light.

In entsprechender Weise kann eine im ersten Schritt erzeugte rote Farbmarkierung im zweiten Schritt in eine gelbe oder magentafarbene Markierung umgewandelt werden, und zwar durch Laserbehandlung im zweiten Schritt mit grünem Laserlicht bzw. blauem Laserlicht.In a corresponding manner, a red color marking produced in the first step can be converted into a yellow or magenta marking in the second step by laser treatment in the second step with green laser light or blue laser light.

Um an der im ersten und zweiten Schritt behandelten Stelle eine transparente Stelle zu erhalten, d.h. eine weiße Stelle zu erhalten, wenn die Hintergrundschicht 5 weiß ist, muss in einem 3. Schritt diese Stelle mit einem Laserstrahl behandelt werden, dessen Wellenlänge so eingestellt ist, dass die an dieser Stelle nach dem zweiten Schritt ungebleicht verbliebene Pigmentkomponente gebleicht wird, d.h. die gelbe Farbmarkierung muss mit blauem Laserlicht, die magentafarbene Markierung mit grünem Licht und die cyanfarbene Markierung mit rotem Laserlicht gebleicht werden.To obtain a transparent site at the site treated in the first and second steps, i. To obtain a white spot when the background layer 5 is white, in a third step, this spot must be treated with a laser beam whose wavelength is adjusted to bleach the unbleached pigment component remaining at that point after the second step, i. the yellow color mark must be bleached with blue laser light, the magenta mark with green light, and the cyan mark with red laser light.

In gleicher Weise werden sodann in der lasersensitiven Schicht 4 weitere benachbarte Stellen behandelt, um weitere Farbmarkierungen in der Schicht 4 der Prägefolie zu erzeugen. Auf diese Weise kann ein Vollfarbenbild hergestellt werden.In the same way, further adjacent points are then treated in the laser-sensitive layer 4 in order to produce further color markings in the layer 4 of the stamping foil. In this way, a full-color image can be produced.

Laserbehandlung kann auch eingesetzt werden, um in dem Farbmittel bzw. den Farbmitteln in der lasersensitiven Schicht durch Farbumschlag Farbmarkierungen bzw. ein Vollfarbenbild zu erzeugen. Die Laserbehandlung kann in entsprechender Weise mit aufeinanderfolgenden Verfahrensschritten erfolgen. Als Farbmittel, d.h. farbgebende Substanzen kommen Pigmente in Frage. Diese sind meist unlöslich und es handelt sich in der Regel um anorganische Substanzen. Als Farbmittel kommen aber auch meist lösliche, organische Farbmittel in Frage. Der Farbumschlag erfolgt jeweils bei spezifischen Laserbedingungen, die bei der Laserbehandlung in den einzelnen Schritten dann angewandt werden.Laser treatment can also be used to produce color markers or a full-color image in the colorant or the colorants in the laser-sensitive layer by color change. The laser treatment can be carried out in a corresponding manner with successive process steps. As a colorant, i. Coloring substances are pigments in question. These are usually insoluble and are usually inorganic substances. As a colorant but also mostly soluble, organic colorants in question. The color change takes place in each case under specific laser conditions, which are then used in the laser treatment in the individual steps.

In entsprechender Weise kann das beschriebene Bleich- und Farbumwandlungsverfahren auch eingesetzt werden, wenn das lasersensitive Material nur aus einer oder zwei Farbmittelkomponenten besteht. Auch können andere Farbmittelkomponenten und auch andere Laserbedingungen, insbesondere andere Laserwellenlängenbereiche bei der Laserbehandlung eingesetzt werden.Similarly, the bleaching and color conversion process described can also be used if the laser-sensitive material consists of only one or two colorant components. It is also possible to use other colorant components and also other laser conditions, in particular other laser wavelength ranges, in the laser treatment.

Die Laserbehandlung erfolgt in der Regel an der auf dem Substrat aufgebrachten Folie. Sie kann aber alternativ auch vor dem Aufbringen der Folie erfolgen, indem alleine die Folie bestrahlt wird und zwar insbesondere dann, wenn die Schutzschicht 3 oder irgendeine andere Schicht z.B. eine Hintergrundschicht 5 als eine für Laserstrahlung nicht oder nur teilweise transparente Schicht oder eine für Laserstrahlung im bestimmten Wellenlängenbereich nicht transparente Schicht ausgebildet ist oder eine zusätzliche UV-absorbierende Schutzschicht vorgesehen ist. Die Laserbehandlung erfolgt dann, vorzugsweise vor dem Auftragen der Folie, indem der Laserstrahl auf die Rückseite der Folie, d.h. auf die untere Hintergrundschicht 5 bzw. die Kleberschicht 6 gerichtet wird und somit die lasersensitive Schicht 4 also von der anderen Seite her behandelt wird, um darin die Farbmarkierungen in gleicher Weise zu erzeugen. Die Hintergrundschicht 5 und die Kleberschicht 6 sind bei diesen Anwendungen für die betreffende Laserstrahlung transparent oder zumindest teiltransparent.The laser treatment is usually carried out on the applied film on the substrate. Alternatively, however, it can also be carried out before the film is applied, by irradiating the film alone, specifically if the protective layer 3 or any other layer has, for example, a background layer 5 as a layer which is not or only partially transparent to laser radiation or one for laser radiation in the certain wavelength range is formed non-transparent layer or an additional UV-absorbing protective layer is provided. The laser treatment is then carried out, preferably before the application of the film by the laser beam on the back of the film, ie on the lower Background layer 5 or the adhesive layer 6 is directed and thus the laser-sensitive layer 4 is thus treated from the other side to generate the color marks in the same way. The background layer 5 and the adhesive layer 6 are transparent or at least partially transparent for the laser radiation in question in these applications.

Die Rezeptur der in den Ausführungsbeispielen verwendeten Schichten lautet wie folgt: Ablöseschicht 2 (Trennschicht): Toluol 99,5 Teile Esterwachs (Tropfpunkt 90°C) 0,5 Teile Schutzschicht 3 (Schutzlackschicht): Methylethylketon 61,0 Teile Diaketonalkohol 9,0 Teile Methylmethacrylat (Tg = 122°C) 18,0 Teile Polyethylendispersion (23% in Xylol) (Erweichungspunkt 140°C) 7,5 Teile Hochmolekulares Dispergieradditiv (40%, Aminzahl 20) 0,5 Teile Extender (Aluminiumsilikat) 4,0 Teile Lasersensitive Schicht 4 (Erste Farblackschicht): Methylethylketon 34,0 Teile Toluol 26,0 Teile Ethylacetat 13,0 Teile Cellulosenitrat (niedrigviskos, 65% in Alkohol) 20,0 Teile Lineares Polyurethan (Fp.>200°C) 3,5 Teile Hochmolekulares Dispergieradditiv (40%, Aminzahl 20) 2,0 Teile z.B.: Pigment Blue 15:4 0,5 Teile Pigment Red 57:1 0,5 Teile Pigment Yellow 155 0,5 Teile Hinterqrundschicht 5 (Zweite Farblackschicht): Methylethylketon 40,0 Teile Toluol 22,0 Teile Ethylen-Vinylacetat-Terpolymer (Fp.= 60°C) 2,5 Teile Polyvinylchlorid (Tg: 89°C) 5,5 Teile Polyvinylchlorid (Tg: 40°C) 3,0 Teile Dispergieradditiv (50%, Säurezahl 51) 1,0 Teile Titandioxid (d=3,8-4,2 g/cm3) 26,0 Teile Kleberschicht 6: Methylethylketon 55,0 Teile Toluol 12,5 Teile Ethanol 3,5 Teile Polyvinylacetat (Erweichungspkt. 80°C) 6,0 Teile Butyl-/Methylmethacrylat (Tg: 80°C) 8,0 Teile Ethylmethacrylatharz (Tg: 63°C) 3,0 Teile Methacrylatcopolymer (Tg: 80°C) 5,0 Teile Ungesättigtes Polyesterharz (Erweichungspkt. 103°C) 3,5 Teile Siliciumdioxid 3,5 Teile The recipe of the layers used in the embodiments is as follows: Release Layer 2 (Release Layer): toluene 99.5 parts Ester wax (dropping point 90 ° C) 0.5 parts Protective layer 3 (protective lacquer layer): methyl ethyl ketone 61.0 parts Diaketonalkohol 9.0 parts Methyl methacrylate (Tg = 122 ° C) 18.0 parts Polyethylene dispersion (23% in xylene) (softening point 140 ° C) 7.5 parts High molecular weight dispersing additive (40%, amine number 20) 0.5 parts Extender (aluminum silicate) 4.0 parts Laser-sensitive layer 4 (first color coat layer): methyl ethyl ketone 34.0 parts toluene 26.0 parts ethyl acetate 13.0 parts Cellulose nitrate (low viscosity, 65% in alcohol) 20.0 parts Linear polyurethane (mp> 200 ° C) 3.5 parts High molecular weight dispersing additive (40%, amine number 20) 2.0 parts eg: Pigment Blue 15: 4 0.5 parts Pigment Red 57: 1 0.5 parts Pigment Yellow 155 0.5 parts Background Layer 5 (Second Color Lacquer Layer): methyl ethyl ketone 40.0 parts toluene 22.0 parts Ethylene-vinyl acetate terpolymer (mp = 60 ° C) 2.5 parts Polyvinyl chloride (Tg: 89 ° C) 5.5 parts Polyvinyl chloride (Tg: 40 ° C) 3.0 parts Dispersing additive (50%, acid number 51) 1.0 parts Titanium dioxide (d = 3.8-4.2 g / cm 3 ) 26.0 parts Adhesive layer 6: methyl ethyl ketone 55.0 parts toluene 12.5 parts ethanol 3.5 parts Polyvinyl acetate (softening point 80 ° C) 6.0 parts Butyl / methyl methacrylate (Tg: 80 ° C) 8.0 parts Ethyl methacrylate resin (Tg: 63 ° C) 3.0 parts Methacrylate copolymer (Tg: 80 ° C) 5.0 parts Unsaturated polyester resin (softening point 103 ° C) 3.5 parts silica 3.5 parts

Der Gegenstand der Erfindung sei abschließend noch mal kurz mit seinen wesentlichen Vorteilen und Funktionen in Verbindung mit den Figuren 5 bis 7 erläutert:The subject of the invention is finally briefly explained again with its essential advantages and functions in connection with FIGS. 5 to 7:

Es wird ein mehrschichtiger Datenträger geschaffen, der mindestens zwei verschiedene lasersensitive Schichten enthält, wobei eine lasersensitive Schicht 1 vorzugsweise mehrfarbig laserpersonalisierbar ist und eine weitere lasersensitive Schicht 2 vorzugsweise monochrom laserpersonalisierbar ist.A multilayer data carrier is provided which contains at least two different laser-sensitive layers, wherein a laser-sensitive layer 1 is preferably laser-personalized in a multicolor manner and a further laser-sensitive layer 2 is preferably monochromatic laser-personalizable.

Die lasersensitiven Materialien können hierfür in der Art eingestellt werden, dass mittels Laserstrahlung einer definierten Wellenlänge und Intensität in beiden Materialien eine Markierung erzielt werden kann.For this purpose, the laser-sensitive materials can be set in such a way that a marking can be achieved by means of laser radiation of a defined wavelength and intensity in both materials.

Die lasersensitiven Schichten liegen vorzugsweise teilflächig übereinander.The laser-sensitive layers preferably lie over one another over part of the area.

Zwischen diesen lasersensitiven Schichten ist eine für die Laserstrahlung nicht durchlässige Schicht 3 teilflächig angeordnet. Diese optische Sperrschicht 3 ist eine reflektierende Schicht in bevorzugter Ausführung eine diffus reflektierende Schicht. Sie enthält bevorzugt einen ausreichenden Anteil an Weißpigment und verhindert somit ein Eindringen des Laserlichtes in die darunter liegenden Schichten.Dies ist die Voraussetzung für die erfindungsgemäße Anordnung der unterschiedlichen laserpersonalisierbaren Schichten. Getrennt durch die optische Sperrschicht kann die mehrfarbig laserpersonalisierbare Schicht 1 über der monochrom laserpersonalisierbaren Schicht 2 liegen, ohne dass bei der Farblaserpersonalisierung eine nicht beabsichtigte Karbonisierung in der darunter liegenden monochrom laserpersonalisierbaren Schicht 2 erfolgt.Between these laser-sensitive layers, a layer 3 which is impermeable to the laser radiation is arranged over part of the surface. This optical barrier layer 3 is a reflective layer in a preferred embodiment, a diffusely reflecting layer. It preferably contains a sufficient proportion of white pigment and thus prevents penetration of the laser light into the underlying layers. This is the prerequisite for the arrangement according to the invention of the different laser-personalisable layers. Separated by the optical barrier layer, the multi-color laserpersonalisierbare layer 1 can be above the monochrome laserpersonalisierbaren layer 2, without at the color laser personalization an unintentional carbonation in the underlying monochrome laserpersonalisierbaren layer 2 takes place.

Die optische Sperrschicht kann auf verschiedene Weise als zusätzliche Schicht eingebaut werden. Vorzugsweise wird die optische Sperrschicht im Dekordruck auf eine der Deckschichten aufgebracht.The optical barrier layer can be incorporated in various ways as an additional layer. Preferably, the optical barrier layer is applied to one of the cover layers in decorative printing.

Der beschriebene mehrschichtige Datenträger kann hergestellt werden nach einem der folgenden Verfahren:

  • Spritzgießverfahren vorzugsweise Mehrkomponentenspritzguss oder Inmould-Decoration,
  • Lamination von Folienverbunden,
  • Lamination von Mischaufbauten vorzugsweise aus Papier und Kunststofffolien,
  • Beschichten von Papierträgern oder Kunststoffträgern,
  • Bedrucken von Papierträgern oder Kunststoffträgern,
  • Folientransferprozess auf Papierträgern oder Kunststoffträgern,
  • oder einer Kombination der genannten Verfahren.
The described multilayer data carrier can be produced by one of the following methods:
  • Injection molding preferably multi-component injection molding or in-mold decoration,
  • Lamination of film composites,
  • Lamination of mixed structures preferably made of paper and plastic films,
  • Coating paper carriers or plastic carriers,
  • Printing on paper carriers or plastic carriers,
  • Film transfer process on paper carriers or plastic carriers,
  • or a combination of said methods.

Fig 1 zeigt einen vorzugsweisen Aufbau eines Datenträgers.1 shows a preferred construction of a data carrier.

Die optische Sperrschicht kann auch oberhalb der lasersensitiven Schichten angeordnet sein und damit eine teilflächige Abdeckung der lasersensitiven Schichten bewirken. Bevorzugt wird dann diese optische Sperrschicht als Dekordruck ausgeführt vorzugsweise in Form von Linienmustern wie etwa Guillochen. Die Bildinformation des Dekordrucks wird dann nach der Laserpersonalisierung insofern in die laserpersonalisierbaren Schichten übertragen, dass hier die laserpersonalisierte Bildinformation durch die Bildinformation der optischen Sperrschicht unterbrochen ist.The optical barrier layer can also be arranged above the laser-sensitive layers and thus cause partial coverage of the laser-sensitive layers. Preferably, this optical barrier layer is then carried out as decorative printing, preferably in the form of line patterns such as guilloche. The image information of the decor print is then in the laserpersonalisierbaren layers after the laser personalization transmitted here that the laser-personalized image information is interrupted by the image information of the optical barrier layer.

Da das mit Hilfe der Farblaserpersonalisierung generierte graphische Element im Sinne eines Farbbildes als Teil eines Dokuments erscheint, muss Sicherheit gegen Verfälschung gegeben sein. Die Gefahr einer Verfälschung ist gegeben, indem das Farbbild aus dem Dokument herausgetrennt und durch eine anderes ersetzt werden kann.Hoher Schutz gegen Verfälschung ist gegeben, wenn graphische Elemente der Laserpersonalisierung das Farbbild mit anderen Elementen des Dokumentes verbinden im Sinne eines fotointegrierten Hintergrundes.Since the graphic element generated with the aid of color laser personalization appears in the sense of a color image as part of a document, there must be security against falsification. The risk of falsification exists in that the color image can be separated from the document and replaced by another. High protection against adulteration exists when graphic elements of the laser personalization connect the color image with other elements of the document in the sense of a photo-integrated background.

Eine Integration der unterschiedlichen Merkmale: Farblaserpersonalisierung und Laserpersonalisierung in Graustufen in einem Datenträgers erfolgt in der Form, dass die unterschiedlichen laserpersonalisierbaren Schichten nur teilflächig übereinander angeordnet sind. Hierdurch ergeben sich unterschiedliche Möglichkeiten der integrierten Farblaserpersonalisierung.An integration of the different features: color laser personalization and laser personalization in grayscale in a data carrier takes place in the form that the different laserpersonalisierbaren layers are only partially arranged on top of each other. This results in different possibilities of integrated color laser personalization.

Fig. 6 zeigt die Möglichkeiten der Lasermarkierung an einem vorzugsweisen Aufbau eines Datenträgers.Fig. 6 shows the possibilities of laser marking on a preferred construction of a data carrier.

Erfolgt die Laserpersonalisierung an der Stelle, an der nur die monochrom laserpersonalisierbaren Schicht 2 liegt, wird eine monochrom schwarze Markierung 9 erzeugt.If the laser personalization takes place at the location where only the monochrome laser-personalisable layer 2 is located, a monochrome black marking 9 is produced.

Erfolgt die Laserpersonalisierung an der Stelle, an der nur die mehrfarbig laserpersonalisierbare Schicht 1 über der für die Laserstrahlung nicht durchlässige Schicht 3 und über der monochrom laserpersonalisierbaren Schicht 2 liegt, wird eine mehrfarbige Markierung 8 erzeugt.If the laser personalization takes place at the point where only the multicolor laser-personalisable layer 1 is not above that for the laser radiation permeable layer 3 and over the monochrome laserpersonalisierbaren layer 2, a multi-colored marker 8 is generated.

Erfolgt die Laserpersonalisierung an der Stelle, an der nur die mehrfarbig laserpersonalisierbare Schicht 1 über der monochrom laserpersonalisierbaren Schicht 2 liegt, ohne durch die optische Sperrschicht 3 getrennt zu sein, wird eine Überlagerung aus mehrfarbiger 9 und monochrom schwarzer Markierung 8 erzeugt. Diese Markierung ist ebenfalls mehrfarbig, aufgrund der gegenläufigen Effekte von Bleichen und Schwärzen erscheint sie aber dunkler als die reine, mehrfarbige Markierung.If the laser personalization takes place at the point at which only the multi-color laser-personalisable layer 1 lies above the monochrome laser-personalisable layer 2 without being separated by the optical barrier layer 3, an overlay of multicolor 9 and monochrome black marking 8 is produced. This mark is also multi-colored, but due to the contrasting effects of bleaching and blackening, it appears darker than the pure, multi-colored mark.

Fig. 7 zeigt wie integrierende Bildelemente durch die Kombination der Laserpersonalisierung in Farbe mit der klassischen Graustufenlaserung erreicht werden können. Die Absorption der laserpersonalisierbaren Schichten wird hierzu so eingestellt, dass die zum Bleichen benötigte Laserleistung ausreicht, um in der in dem Dokument zusätzlich verwendeten monochrom laserpersonalisierbaren Schicht zu karbonisieren. Liegt die monochrom laserpersonalisierbare Schicht 2 unter der mehrfarbig laserpersonalisierbaren Schicht 1 und wird diese nur teilflächig durch die optische Sperrschicht 3 abgedeckt, so erlaubt dieser Aufbau, dass Bildelemente wie z.B. Linien oder alphanumerische Zeichen, welche über die Begrenzung der optischen Sperrschicht 3 hinaus gelasert werden, eine Karbonisierung des Hintergrundes bewirken. So können durchgehende Bildelemente mit einem Wechsel der Art der Markierung innerhalb des Elementes erzeugt werden. Wenn die Begrenzung der optischen Sperrschicht 3 mit der Begrenzung der mehrfarbig laserpersonalisierbaren Schicht 1 übereinstimmt, entsteht ein Wechsel von bunt zu unbunt. Diese durchgehenden Bildinformationen wirken integrierend.Fig. 7 shows how integrating picture elements can be achieved by the combination of laser personalization in color with the classical gray scale laser. The absorption of the laser-personalisable layers is adjusted for this purpose so that the laser power required for bleaching is sufficient to carbonize in the monochrome laser-personalisable layer additionally used in the document. If the monochrome laser-personalisable layer 2 lies underneath the multicolor laser-personalisable layer 1 and if it is covered by the optical barrier layer 3 only over part of the surface, this structure allows picture elements, such as lines or alphanumeric characters, which are lasered beyond the boundary of the optical barrier layer 3, cause a carbonation of the background. Thus, continuous picture elements can be generated with a change in the type of marking within the element. If the boundary of the optical barrier layer 3 coincides with the boundary of the multi-colored laser-personalisable layer 1, a change from colorful to achromatic arises. This continuous image information has an integrating effect.

Weiterhin sind integrierende Bildelemente möglich, die durch die Kombination der Laserpersonalisierung in Farbe mit weiteren graphischen Elementen erreicht werden. Die Transparenz der mehrfarbig laserpersonalisierbaren Schicht nimmt mit zunehmendem Bleichen zu. Dies erlaubt, dass Layoutelemente wie zum Beispiel Guillochen, die auf Schichten unterhalb der mehrfarbig laserpersonalisierbare Schicht, z.B. auf das Kernmaterial, gedruckt sind, nach dem Farblasern im Farbbild erscheinen. Somit erscheinen Bildelemente wie zum Beispiel gedruckte Linien, welche nur teilflächig durch die mehrfarbig laserpersonalisierbaren Schicht 1 abgedeckt werden, nach der Farblaserpersonalisierung als integrierende Elemente. Integrierende Elemente wie diese, die über den Rand eines personalisierten Merkmals reichen, erschweren die Verfälschung des Datenträgers in hohem Maße.Furthermore, integrating picture elements are possible, which are achieved by combining laser personalization in color with other graphic elements. The transparency of the multicolor laser-personalisable layer increases with increasing bleaching. This allows layout elements, such as guilloches, to be printed on layers below the multicolor laser-personalisable layer, e.g. are printed on the core material, after which color lasers appear in the color image. Thus, picture elements such as printed lines, which are only partially covered by the multicolor laser-personalisable layer 1, appear as integrating elements after the color laser personalization. Integrating elements such as these, which extend beyond the edge of a personalized feature, greatly complicate the corruption of the volume.

Ein weiteres Merkmal der Erfindung ist, dass die zusätzliche Schicht eine gezielte Einstellung der Helligkeit des Hintergrundes unabhängig vom verwendeten Trägermaterial erlaubt. So kann z.B. durch die Verwendung optischer Aufheller oder die Verwendung von Pigmentzusätzen ein zusätzlicher Effekt erreicht werden.Another feature of the invention is that the additional layer allows a specific adjustment of the brightness of the background, regardless of the carrier material used. Thus, e.g. By using optical brightener or the use of pigment additives, an additional effect can be achieved.

Aus all dem folgt, daß der Gegenstand der Erfindung ein mehrschichtiger Datenträger ist, der mindestens zwei verschiedene lasersensitive Schichten enthält, wobei eine lasersensitive Schicht mehrfarbig laserpersonalisierbar ist und eine weitere lasersensitive Schicht monochrom laserpersonalisierbar ist. Diese lasersensitiven Schichten liegen teilflächig übereinander und vorzugsweise die mehrfarbig laserpersonalisierbare Schicht über der monochrom laserpersonalisierbaren Schicht liegt. Die lasersensitiven Schichten können derart ausgeführt sein, dass in einem Lasermarkierungsschritt mit der gleichen Wellenlänge und Energie der Laserstrahlung in sowohl der mehrfarbig laserpersonalisierbaren als auch in der monochrom laserpersonalisierbaren Schicht eine jeweilige Markierung erzielt werden kann.It follows from all this that the subject matter of the invention is a multilayer data carrier which contains at least two different laser-sensitive layers, wherein a laser-sensitive layer can be laser-personalized in multiple colors and a further laser-sensitive layer can be monochromaticly laser-personalized. These laser-sensitive layers lie over one another over part of the surface, and preferably the multi-colored laser-personalisable layer lies above the monochrome laser-personalisable layer. The laser-sensitive layers may be designed such that in a laser marking step with the same wavelength and energy Laser radiation in both the multicolor laserpersonalisierbaren and in the monochrome laserpersonalisierbaren layer a respective mark can be achieved.

Vorzugsweise ist zwischen diesen lasersensitiven Schichten eine für die Laserstrahlung nicht durchlässige Schicht zumindest teilflächig angeordnet.Preferably, a layer which is not permeable to the laser radiation is at least partially arranged between these laser-sensitive layers.

Vorzugsweise ist die für die Laserstrahlung nicht durchlässige Schicht eine reflektierende Schicht, die in bevorzugter Ausführung eine diffus reflektierende Schicht sein kann und einen ausreichenden Anteil eines Zusatzstoffes enthält, der das Laserlicht reflektiert oder streut.Preferably, the non-transmissive to the laser radiation layer is a reflective layer, which may be a diffusely reflecting layer in a preferred embodiment and contains a sufficient proportion of an additive that reflects or scatters the laser light.

Die Laserpersonalisierung kann in einer oberen laserpersonalisierbaren Schicht, vorzugsweise in einer mehrfarbig laserpersonalisierbaren Schicht erfolgen, ohne dass eine unterhalb dieser Schicht liegende laserpersonalisierbare Schicht durch die Laserstrahlung verändert wird, indem die Laserpersonalisierung dort erfolgt, wo die lasersensitiven Schichten durch eine für die Laserstrahlung nicht durchlässige Schicht optisch voneinander getrennt sind.The laser personalization can take place in an upper laser-personalisable layer, preferably in a multicolor laser-personalisable layer, without a laser-personalisable layer lying beneath this layer being changed by the laser radiation, in that the laser personalization takes place where the laser-sensitive layers are penetrated by a layer which is not transparent to the laser radiation are optically separated from each other.

Die Laserpersonalisierung kann erfolgen mit einem Laserstrahl sowohl in einer oberen laserpersonalisierbaren Schicht, vorzugsweise in einer mehrfarbig laserpersonalisierbaren Schicht, als auch in einer unterhalb dieser Schicht liegenden laserpersonalisierbaren Schicht, indem die Laserpersonalisierung dort erfolgt, wo die lasersensitiven Schichten nicht durch eine für die Laserstrahlung nicht durchlässige Schicht optisch voneinander getrennt sind.The laser personalization can be carried out with a laser beam both in an upper laserpersonalisierbaren layer, preferably in a multicolored laserpersonalisierbaren layer, as well as in a lying below this layer laserpersonalisierbaren layer by the laser personalization takes place where the laser-sensitive layers not by a non-transmissive to the laser radiation Layer are optically separated from each other.

Die Laserpersonalisierung kann mit einem Laserstrahl sowohl in einer oberen laserpersonalisierbaren Schicht, vorzugsweise in einer mehrfarbig laserpersonalisierbaren Schicht, als auch in einer unterhalb dieser Schicht liegenden laserpersonalisierbaren Schicht durchgeführt werden, indem die Laserpersonalisierung in der Art erfolgt, dass graphische Bildelemente über die Teilflächen der jeweiligen laserpersonalisierbaren Schicht, vorzugsweise der mehrfarbig laserpersonalisierbaren Schicht, hinaus angeordnet werden, so dass innerhalb des Bildelementes ein Wechsel von mehrfarbiger zu monochromer Darstellung erreicht wird.Laser personalization can be carried out with a laser beam both in an upper laser-personalisable layer, preferably in a multicolor laser-personalisable layer, and in a laser-personalisable layer located below this layer, by laser personalization in such a way that graphic image elements are projected over the partial surfaces of the respective laser-personalisable layer Layer, preferably the multi-colored laserpersonalisierbaren layer, are arranged out, so that within the picture element a change from multi-colored to monochrome representation is achieved.

Die Laserpersonalisierung kann mit einem Laserstrahl in einer laserpersonalisierbaren Schicht durchgeführt werden, indem die Laserpersonalisierung in der Art erfolgt, dass graphische Bildelemente über die Teilflächen der oberhalb der laserpersonalisierbaren Schicht angeordneten optischen Sperrschicht, hinaus angeordnet werden, so dass innerhalb der laserpersonalisierbaren Schicht eine Unterbrechung der so erzeugten graphische Bildelemente erreicht wird. Als unterbrechende Elemente im Sinne einer optischen Sperrschicht können vorzugsweise gedruckte Elemente wie zum Beispiel Guillochen oberhalb der laserpersonalisierbaren Schicht angeordnet werden.The laser personalization can be performed with a laser beam in a laser personalisierbaren layer by the laser personalization takes place in such a way that graphical image elements on the faces of the above the laserpersonalisierbaren layer arranged optical barrier layer, are arranged out, so that within the laserpersonalisierbaren layer interrupting the so generated graphic image elements is achieved. As interrupting elements in the sense of an optical barrier layer, printed elements such as, for example, guilloches can preferably be arranged above the laser-personalisable layer.

Die Laserpersonalisierung kann mit einem Laserstrahl in einer mehrfarbig laserpersonalisierbaren Schicht durchgeführt werden, sodass gestalterische Elemente vorzugsweise gedruckte Elemente wie zum Beispiel Guillochen, die auf Schichten unterhalb der mehrfarbig laserpersonalisierbare Schicht, zum Beispiel auf das Trägermaterial, gedruckt sind, nach dem Farblasern im Farbbild erscheinen, indem die Transparenz der mehrfarbig laserpersonalisierbaren Schicht durch den Prozess der Lasermarkierung erhöht wird.The laser personalization can be performed with a laser beam in a multicolor laser personalisable layer so that design elements preferably appear printed elements such as guilloches printed on layers beneath the multicolor laser personalisable layer, for example on the substrate, after the color laser in color image, by increasing the transparency of the multicolor laser-personalisable layer by the process of laser marking.

Wesentlicher Vorteil der Erfindung ist, dass die bekannte Laserpersonalisierung in Graustufen mit der neuen Methode der Farblaserpersonalisierung kombiniert wird. Die Sicherheit von Dokumenten kann durch die Kombination in der beschriebenen Weise wesentlich erhöht werden.An essential advantage of the invention is that the known laser personalization in gray scale is combined with the new method of color laser personalization. The security of documents can be significantly increased by the combination in the manner described.

Claims (18)

  1. Multilayer body
    as a multilayer film, preferably a transfer film or laminating film, or as a layer composite formed in laminated form from at least one overlay film and inlay,
    having a first layer having laser-sensitive material - referred to as the first laser-sensitive layer in the following - and a second layer having laser-sensitive material - referred to as the second laser-sensitive layer in the following - which are arranged to overlap each other, at least in some regions,
    characterized
    in that the laser-sensitive material of the first laser-sensitive layer has a colorant which can be bleached by the action of laser radiation or changes its colour with a colour change as a result of the action of laser radiation; and
    in that the laser-sensitive material of the second laser-sensitive layer has a colorant which can be bleached by the action of laser radiation or changes its colour with a colour change as a result of the action of laser radiation, or the laser-sensitive material of the second laser-sensitive layer has a doped material which can be blackened by the action of laser radiation,
    a specific background layer being arranged between the laser-sensitive layers as an intermediate layer, at least in some regions, and acting in the manner of a barrier layer which is not transparent to the laser radiation which is used for the generation of the laser-induced marking in the laser-sensitive layer,
    so that, during the laser irradiation, in regions with an intermediate layer, a laser-induced marking can be obtained only in the upper laser-sensitive layer and, in regions without an intermediate layer, different laser-induced markings lying one above another can then be obtained in both laser-sensitive layers as a combined marking.
  2. Multilayer body according to Claim 1, characterized in that, on a side facing the substrate of at least one of the laser-sensitive layers, at least in one subregion, there is arranged a background layer that reflects and/or is non-transparent or largely non-transparent and/or absorbent to the laser radiation used.
  3. Multilayer body according to Claim 2, characterized in that the background layer is arranged between the first laser-sensitive layer and the second laser-sensitive layer.
  4. Multilayer body according to Claim 2 or 3, characterized in that the background layer is transparent to light in the visible spectral range and/or is transparent or non-transparent to laser radiation under only specific laser conditions, in particular only specific laser wavelength ranges and/or angles of irradiation, preferably is transparent or non-transparent to the laser radiation which is used for the generation of the laser-induced marking in the laser-sensitive layer.
  5. Multilayer body according to one of the preceding claims, characterized in that the laser-sensitive material of the first laser-sensitive layer differs from the laser-sensitive material of the second laser-sensitive layer, preferably in such a way that the specific laser processing conditions of the two materials differ.
  6. Multilayer body according to one of the preceding claims, characterized in that the laser-sensitive colorant is formed as a mixture of at least two, preferably three, laser-sensitive colorant components, it being true of each of these two or three laser-sensitive colorant components that, under the laser conditions specific to one colorant component, the other colorant components cannot be changed or substantially cannot be changed, preferably bleached.
  7. Multilayer body according to Claim 6, characterized in that the mixture has two or three of the following colorant components: cyan colorant, magenta colorant, yellow colorant.
  8. Multilayer body according to one of the preceding claims, characterized in that the doped material which can be blackened under the action of laser radiation is formed as carbon and/or carbon black doped material.
  9. Method for generation of a multilayer image in the multilayer body according to one of the preceding claims, the multilayer image being assembled from a plurality of laser-induced image components by a first laser-induced image component being produced in a first laser-sensitive layer of the multilayer body by the action of laser radiation under first laser conditions, and a second laser-induced image component being produced in a second laser-sensitive layer of the multilayer body by the action of laser radiation under second laser conditions.
  10. Method according to Claim 9, characterized in that the first laser conditions and the second laser conditions are formed differently, preferably with regard to laser wavelength and/or radiation intensity and/or angle of irradiation.
  11. Method according to Claim 9 or 10, characterized in that the first laser-induced image component and the second laser-induced image component are generated with a time offset in relation to each other or simultaneously.
  12. Method according to one of Claims 9 to 11, characterized in that at least one of the laser-induced components is formed as a coloured marking.
  13. Method according to one of Claims 9 to 12, characterized in that at least one of the laser-induced image components is formed as a black marking, preferably a grey-step marking.
  14. Method according to one of Claims 9 to 13, characterized in that the laser-induced image component is introduced in a region of the laser-sensitive layer which is arranged above a background layer which is reflective to the laser radiation used and/or is non-transparent and/or absorbent to the non-reflected proportion of the laser radiation.
  15. Method according to one of Claims 9 to 14, characterized in that the laser-induced image component is formed as a multicolour image, preferably a full-tone image, by means of laser-induced bleaching or laser-induced colour change.
  16. Method according to one of Claims 9 to 15, characterized in that the laser-induced image component is preferably formed as a grey-step image by laser-induced blackening.
  17. Method according to one of Claims 9 to 16, characterized in that the laser-sensitive material is formed as a mixture of at least two, preferably three, laser-sensitive colorant components, it being possible for each of the two or three colorant components to be changed, preferably bleached, by means of a laser in each case under laser conditions specific to the component, it being true of each of the three colorant components that, under the laser conditions specific to one colorant component, the other colorant component or the two other colorant components cannot be bleached or substantially cannot be bleached.
  18. Method according to Claim 17, characterized in that a colorant mixture of two or three of the following colorant components is used: cyan colorant, magenta colorant, yellow colorant, provision preferably being made for red laser light to be used for bleaching the cyan colorant, for green laser light to be used for bleaching the magenta colorant and for blue laser light to be used for bleaching the yellow colorant.
EP02742734A 2001-11-02 2002-05-08 Multilayer body with a first laser-sensitive layer and a second laser-sensitive layer and method for generation of a multilayer image in said multilayer body Expired - Lifetime EP1439964B8 (en)

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WOPCT/EP01/04154 2001-11-02
PCT/DE2001/004154 WO2002036356A1 (en) 2000-11-04 2001-11-02 Plastic body, which is provided in the form of a film, for example, a transfer film or laminate film or which is provided with a film of this type, and method for producing a multicolor image on or in a plastic body of this type
PCT/DE2002/001675 WO2003039888A1 (en) 2001-11-02 2002-05-08 Multilayer body with a first laser-sensitive layer and a second laser-sensitive layer and method for generation of a multilayer image in said multilayer body

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WO2003039888A1 (en) 2003-05-15
EP1439964B8 (en) 2008-10-15
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DE50211413D1 (en) 2008-01-31
EP1439964A1 (en) 2004-07-28

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