RU2294416C2 - Multilayer body comprising substrate at least partly consisting of paper material, and method for manufacturing of laser-induced marking on or in such multilayer body - Google Patents

Abstract

FIELD: manufacture of bonds or banknotes.

SUBSTANCE: method involves applying transfer film onto paper document, said transfer film being film having adhesive layer or laminated film having adhesive layer and equipped with laser radiation sensitive layer; exposing multilayer body to laser radiation. This results in generation of laser-induced marking in laser radiation sensitive layer, provided, for example, through laser-induced whitening, laser-induced color alteration, or laser-induced blackening process. Laser-induced marking allows documents to be individualized.

EFFECT: enhanced protection of paper documents from counterfeit.

50 cl, 23 dwg

Description

The invention relates to a multilayer body, consisting of a substrate consisting at least partially of paper material, with a single or multilayer structure, emanating from a transfer film, for example a hot stamping film, or from a laminated film, or from a print or other coating, as well as a method for manufacturing laser-induced markings in such a multilayer body.

It is known to use laser radiation to form laser-induced markings to increase counterfeit protection made from synthetic material of cards, such as identification cards, code cards, etc. Using laser-induced markings, individualization of such cards or the like can be undertaken.

Laser processing for individualization is not applicable for documents that consist of paper material, since paper material burns under the influence of laser radiation.

The basis of the invention is the task through the use of laser radiation to increase security against forgery of paper documents. At the same time, they strive to create a special structural form of a paper document, as well as a special way to increase security against falsification.

This problem is solved in the invention by a multilayer body according to paragraph 1 and the method according to paragraph 16 of the claims.

The solution provides that the paper document is made as a multilayer body in which a single-layer or multilayer film or the like is applied to a substrate consisting of paper material, for example, a hot stamping film. This layered structure thus obtained must have at least one layer containing laser-sensitive material. The laser-sensitive material is designed such that by laser irradiation of the film deposited on the substrate, a laser-induced marking is realized in the laser-sensitive layer, for example, in the form of color marking or in the form of black marking. Unexpectedly, under laser irradiation under the influence of radiation on a film made of paper, a substrate made of paper is not damaged, that is, the paper material does not burn, which usually occurs when the paper material is directly irradiated by the laser.

In preferred embodiments, however, for reliability purposes, a special background layer is still placed between the laser-sensitive layer and the substrate surface, which highly reflects the laser radiation used in laser processing, and the non-reflected part of the laser radiation preferably absorbs, or at least in any case, it does not pass to the underlying layers and, therefore, to the surface of the substrate. Due to its reflection of light, this protective background layer can additionally act as a brightener or color enhancer for markings formed in a layer sensitive to laser radiation. This protective layer as well as the lightening and color enhancing background layer in preferred embodiments is located under the laser-sensitive layer exclusively in the region where the laser-induced marking is performed.

The background layer can be made transparent for light in the visible spectral range, but at the same time as opaque for laser radiation in a certain wavelength range, for example, for the wavelength range that is used to form laser-induced markings. If an additional layer sensitive to laser radiation is placed under the background layer, then it is preferable if the background layer is transparent to laser radiation, which is used to form laser-induced markings in this layer.

In particularly preferred embodiments, it is provided that the laser-sensitive material contains at least one dye that, when exposed to the laser, becomes discolored (bleached) or changes its color when exposed to the laser. In this case, the laser-sensitive material can preferably be performed as a mixture of dyes, which consists of several different components of the dyes. A multi-color image with a wide variety of laser-induced colors formed is possible in embodiments in which the laser-sensitive material is made as a mixture of at least two laser-sensitive components for which the condition is met that under laser processing conditions specific to one component, other components do not change or do not change significantly.

Particularly preferred embodiments are those in which a laser-induced multicolor image can be formed. In these embodiments, it is provided that the laser-sensitive material is made as a mixture of at least three laser-sensitive components, each of which is a dye, for example, a pigment or other dye. In the case of pigments, these are most often insoluble dyes, preferably inorganic dyes. Other dyes are, for example, organic dyes, which are most often soluble. Mixtures may be used that use only pigments or only other dyes, or pigments and other dyes as colorants. Dyes, which thus form the components of the mixture, are hereinafter referred to briefly as components. It is essential that one or more components by means of a laser are respectively bleached (bleached) under component-specific conditions of laser processing. That is, for bleaching the first component, a first laser treatment condition or a first specific laser wavelength is provided; for whitening the second component, a second laser processing condition is provided, for example, a second specific laser wavelength; To whiten the third component, a third laser processing condition is provided, for example, a third specific laser wavelength. These specific laser treatment conditions or laser wavelengths used for whitening the various components, respectively, differ from each other. In addition, they are selected in such a way that under laser processing conditions specific for one component, for example, for a specific wavelength, only this one component or preferably only this one component can be bleached, while the remaining components are not bleached or essentially not bleached . Thus, it becomes possible at one stage to specifically bleach only one component during laser processing, and leave the rest unchanged.

If a three-component mixture is used, then the color of the marking is prepared before the first step by means of three components. After laser processing of the first stage, the color of the marking on the treated area is formed by both components that are unbleached during laser processing of the first stage, and, if necessary, additionally by the residual color of the components, which, at the first stage, were whitened to a greater or lesser extent depending on the processing. Preferably, color formation occurs by subtractive mixing of the components present in the mixture in a laser-sensitive layer. The various components may be mixed in one formation directly adjacent to each other or may be mixed in several layers located one above the other.

A method of manufacturing a multi-color image provides that in the first stage, by laser irradiation of a part of the body, that is, a layer sensitive to laser radiation, under conditions specific to one of, for example, three components, only one component is bleached, and in the second stage by laser irradiation under the conditions specific to the other of the three components, only this other component is bleached. Thus, at the first stage, along with the bleached first component, both other unbleached components remain, so that the color is formed by these two unbleached components, and, if necessary, with an incomplete degree of bleaching of the first component, an additional residual color of the more or less bleached first component . After the second stage, in which the second component is bleached, it remains, if the three-component mixture was originally used, only one more component, so that then the color is formed only by this remaining component. This is the case when in the previous steps the remaining components were completely bleached. Otherwise, that is, if the first component is incompletely whitened in the first stage and the second component is incompletely whitened in the second stage, the color after the second stage will be additionally formed by the residual color of the first and second components, only more or less bleached in the first and second stages.

In addition, as a possible third stage, laser processing of the same body area for the third component, that is, the still unbleached component, is provided, moreover, in the same body area under specific laser treatment conditions specific to this third component, for example, at a specific wavelength Only this third component is bleached. Thus, after this third stage, in the corresponding section, all three components are bleached or, depending on the degree of bleaching, are bleached to a greater or lesser extent. Therefore, this section, depending on the possible colored background layer or other possible other components in the body or in the same body layer, appears as colorless or having color shades, in the boundary case, with a white background layer, as white.

In addition, possible additional steps are provided in which, under specific laser processing conditions, one or more other components are whitened (bleached). Preferably, it is provided that in the general case, at the nth stage, only the nth component is bleached for another one of the n components by laser irradiation of the same body region.

Depending on the choice of components and the specific laser processing conditions, it can also be provided that at least one of the components undergoes a color change during laser irradiation.

When laser processing at separate stages, respectively, it is provided that when laser irradiation by adjusting the conditions of laser processing, in particular the laser wavelength, laser radiation intensity and / or irradiation time, the required degree of whitening or color change is established.

The laser processing conditions used in the individual steps, preferably prior to the method, are determined experimentally and / or optimized empirically for the individual components. The criterion for choosing the laser processing conditions is preferably the desired bleaching result. The choice of laser processing conditions for use at individual stages can be such that the component at the laser wavelength used for whitening absorbs light, while the component at this wavelength has an absorption maximum, preferably one of several absorption maxima, or preferably its own or its largest absorption maximum. The choice can also be made in such a way that the component at the laser wavelength used for bleaching absorbs light, but the component at this wavelength does not have an absorption maximum, and this wavelength lies outside the absorption maximum or outside the absorption maxima of the component.

In order to be able to work with a relatively small number of components, but produce as many colors as possible, preferably all colors, it is preferable if one component is a blue pigment and / or one component is a red pigment and / or one component is a yellow pigment . Preferably, the pigment mixture contains blue pigment, red pigment and yellow pigment. In particular embodiments, the pigment mixture is a mixture containing only three components, preferably a blue pigment, a red pigment and a yellow pigment. Using these three colors, subtractive mixing can produce all the colors. Due to the specific bleaching of the individual pigment components, it is possible, for example, to develop a blue color in the first step, if only the yellow pigment is bleached or preferably the yellow pigment in the first step, or the green color can be produced in the first step if it is bleached in this first step only or preferably only a red pigment, or a red color may be generated in a first step if only or preferably a blue pigment is bleached in this first step. In the second stage, blue, red or yellow color can then be produced by whitening one of the pigment components remaining unbleached in the first stage, that is, if blue was developed in the first stage, and therefore, the blue and red colors in the first stage were not bleached , then in the second stage, a blue color can be generated due to the fact that in the second stage the red color is bleached. Obtaining the remaining colors is carried out accordingly, since with the subtractive mixing of colors the following relationships are true:

a) blue + red + yellow the black b) blue + red blue c) blue + yellow green d) yellow + red red

The color mixing according to (a) takes place before the laser treatment, that is, before the first step. The laser sensitive layer appears black or gray. The color mixing according to (b), or (c), or (d) occurs after the first stage, i.e., the layer sensitive to laser radiation in the area in which the laser processing was carried out in the first stage has a blue, or green, or red color marking . After the second stage, when the laser processing of the second stage was performed at the same stage in the second stage, the color marking in this section of the layer acquires a blue, yellow, or red color, depending on which of the two unbleached components in this section at the first stage The pigment remained unbleached in the second stage. In order to obtain a colorless or transparent marking in this section in the third stage, the third stage is then carried out in this section, in which the pigment that remains unbleached is bleached under specific laser treatment conditions.

In this way, in each section, due to sequential laser processing in the same section, correspondingly color marking in any desired color can be generated. In this way adjacent sections of the body can be processed sequentially, and using the resulting adjacent color markings based on synthetic material, a multicolor image, preferably the so-called full-color image, can be formed.

Instead of the above-described pigment mixture containing pigment components such as blue pigment, red pigment and yellow pigment, a corresponding mixture of non-pigment dyes may also be used, i.e. a mixture of dyes of blue dye, red dye and yellow dye as components. It can be processed in the same way, and at certain stages the laser processing conditions specific to the corresponding dye are applied.

For laser processing in various systems, mainly pulsed, frequency-multiplied solid-state lasers, for example, optical parametric generators and pulsed ultraviolet lasers (for example, excimer lasers), are used. In laser processing, the intensity and / or duration of a laser pulse is set so that a maximum bleaching result or maximum color change is achieved without noticeable damage to the base material. The method can be used on a film deposited on a substrate, but also only on separate films, for example, on transfer films, in particular hot stamping films, or on laminated films. Using transfer or laminated films, the advantages are provided in that these films can be applied onto other highly sensitive to laser radiation substrates in order to decorate or identify them. When using films, there is a very small need for dyes or pigments, since dyes or pigments in this case should be present only in a thin layer. Using films, it is also possible to apply only local coatings to bodies of any size, for example, to large-area paper substrates or the like, for example, by means of a printing method.

When laser processing is preferably applied energy density values in the range from 0.05 to 0.5 J / cm ² with a pulse duration of from 5 to 20 ns, and the bleaching result can also be determined by the number of pulses. A laser-sensitive layer with a mixture of pigments can be located on the transfer or laminated film over the entire surface or only in areas.

Preferred embodiments are described in more detail below with reference to the accompanying drawings.

Figures 1-5 are cross-sectional views of various hot stamping films, respectively, with a laser-sensitive layer.

Figures 6-10 are cross-sectional views of various laminated films, respectively, with a laser-sensitive layer.

11a + 11b is a plan view and a sectional view of an embodiment of a multilayer body consisting of a paper substrate with a transfer film applied thereon with a laser-sensitive layer.

12a + 12b is a plan view and a sectional view, respectively of FIG. 11a + 11b of a modified embodiment.

13-15 is an exploded view of a laminated card consisting of various coating films and inserts of paper material.

In the cases shown in figures 1-5 films we are talking about films of hot stamping. The hot stamping film shown in FIG. 1 comprises a carrier film 1, a removable layer 2, a protective layer 3, a laser-sensitive layer 4, a background layer 5 and an adhesive layer 6.

In the case of the carrier film 1, it is preferably a polyethylene film with a thickness of 6 to 100 μm, preferably a thickness of 19 to 38 μm. On this carrier film 1, layers 2 through 6 are placed one above the other. They are applied in a known manner in the manufacture of a hot stamping film.

The removable layer 2 is an intermediate (separating) layer. It is preferably made in the form of a layer softening upon heat release, which, when a hot stamping film is applied to the substrate, allows the remaining layers to be separated from the carrier film 1. The removable layer 2 usually has a thickness of at most 1 μm.

The protective layer 3 is made in the form of a protective layer of varnish. This is a transparent varnish layer designed to effectively protect the free surface of objects decorated with a hot stamping film from mechanical damage and chemical influences. The layer thickness is preferably from 1 to 2 microns.

Sensitive to laser radiation layer 4 is made in the form of the so-called first layer of farbleck. In this case, we are talking about a varnish layer colored with pigment or other dyes, preferably from 3 to 10 microns thick. Pigments and / or other coloring systems or dyes of this farbuck layer selectively bleach and / or change their color to another color using a laser beam, the wavelength of which is preferably in the visible range. Preferably, the pigment concentration of this varnish layer 4 is from 3 to 15% with respect to the solid. The binder system of this varnish layer 4 should not be optically altered by the action of a laser, so that only color contrast marking occurs at irradiated sites without noticeable damage to the surface structure. The film is not noticeably damaged either on the surface or inside.

The background layer 5 is made in the form of the so-called second layer of farbleck. This layer is colored differently from laser-sensitive layer 4. Layer 5 is, for example, white or ivory if the laser-sensitive layer 4 is black or gray. Layer 5 serves primarily as a light background layer for colors formed in the laser-sensitive layer 4 by means of laser radiation. The thickness of the layer 5 is preferably in the range of 15 to 20 microns.

It is possible to provide a background layer 5, as well as a laser-sensitive layer 4, not on the entire surface of the hot stamping film and, therefore, not on the entire surface to be decorated in the same arrangement of colors. Rather, layers 4 and 5 can individually, and thus in different ways, be composed of differently colored areas.

In the case of the adhesive layer 6 we are talking about a conventional and known layer in relation to transfer films or films of hot stamping, having a thickness of from about 1 to 10 μm, and the adhesive layer for a film of hot stamping has such a composition that it becomes adhesive only with appropriate heat .

Layers 2 through 6 can be made according to the following recipe.

The removed layer 2 (intermediate layer):

Toluene 99.5 pieces Paraffin ester (dropping point) 0.5 parts

Protective layer 3 (protective layer of varnish):

Methyl ethyl ketone 61.0 piece Diaketonspirt 9 pieces Methylmethane Acrylate (Tg = 122 ° C) 18.0 parts

Dispersion of polyethylene (23% in xylene)

(softening temperature 140 ° C) 7.5 parts

High molecular weight dispersant

(40%, amine number 20) 0.5 parts Filler (aluminosilicate) 4 parts

Laser Sensitive Layer 4

(First layer of farblack):

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 (Fp.> 200 ° C) 3.5 parts

High molecular weight dispersant

(40%, amine number 20) 2.0 parts e.g. pigment blue 15: 4 0.5 parts pigment red 57: 1 0.5 parts pigment yellow 155 0.5 parts

Background layer 5 (second layer of farblack):

Methyl ethyl ketone 40.0 parts Toluene 22.0 parts Ethylene-Vinyl Acetate - Triple Copolymer (Fp. = 60 ° C) 2.5 parts Polyvinyl Chloride (Tg: 89 ° C) 5.5 parts Polyvinyl Chloride (Tg: 40 ° C) 3.0 parts Dispersing agent (50%, acid number 51) 1.0 part 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 Polymer (Tg: 63 ° C) 3.0 parts Methacrylate Copolymer (Tg: 80 ° C) 5.0 parts

Unsaturated Polyester

(softening temperature 103 ° C) 3.5 parts Silica 3.5 parts

Instead of this hot stamping film, other transfer films can be used. They may have a structure as in the above transfer film.

The transfer films — in this particular case, the hot stamping films — are preferably applied to the substrate in a conventional manner, namely in such a way that the adhesive layer 6 faces the surface of the substrate. The adhesive layer 6 then forms, upon hot stamping, an adhesive bond to the surface of the substrate. Then the carrier film 1 - after softening the removed layer 2 under the influence of heat during hot stamping - is removed. When the hot stamping film is thus deposited on the surface of the substrate, the protective layer 3 then forms the upper surface of the deposited film which is turned away from the substrate.

Shown in figa transfer film, which, in particular, can be made as a film of hot stamping, in contrast to the film of figure 1 does not have a background layer 5.

Shown in figure 2-4 film hot stamping have a background layer made differently than shown in figure 1. In the example of FIG. 2, the background layer is configured as a reflective layer 5r. In a special case, the reflective layer is implemented as a metal reflective layer. The reflective layer may be transparent or partially transparent for certain spectral ranges. It can have a higher refractive index than other layers, and therefore has an increased reflection of light. In the example of FIG. 3, a layer 5c is provided as an additional varnish layer, which is preferably transparent. In addition, a reflective layer 5r is provided, which in regions has a diffraction structure 5b. In the embodiment of FIG. 3, this structure 5b is formed as an integral part of the varnish layer 5c and the adhesive layer 6, as well as the layer between them. Alternatively or additionally, the diffraction grating can also be performed as an integral part of the varnish layer 5c and / or the laser-sensitive layer 4 of the farbuck and / or the adhesive layer 6. The diffraction structure can in this case also be performed in regions or as a continuous layer.

In the example of FIG. 4, in the background layer 5c, a printed image (imprint) 5d is placed in a limited area, and in the laser-sensitive layer with a lateral offset relative to it is a limited laser-sensitive area 4a.

5 shows a hot stamping film with a modified layered structure. The layered structure is similar to that shown in Fig. 3, however, the order of the layers is changed, namely, in such a way that the laser-sensitive layer 4 is placed on the side of the reflection layer 5 turned to the substrate. The layers are arranged in the following order: carrier layer 1, removable layer 2, protective layer 3, intermediate layer 5c, reflective layer 5, laser-sensitive layer 4, background layer 7 and adhesive layer 6. In adjacent adjacent regions of the laser-sensitive layer 4 and reflective layer 5 and intermediate layer 5c, ene diffractive structure 5b. It can be made as a diffraction grating. Alternatively, structure 5b may be implemented as a hologram structure. In the embodiment shown in FIG. 5, the diffraction structure 5b is performed in the manufacture of the film, wherein the diffraction structure is first introduced into the intermediate layer 5c, after which a reflection layer 5r can be applied, for example, by sputtering. The reflective layer 5 in areas outside the diffraction structure is made as a smooth reflective layer 5r. It has a thickness of preferably less than 1 μm. It is at certain viewing angles, at least for certain spectral ranges, transparent or translucent. After applying the reflective layer 5r, a laser-sensitive layer 4 is applied. The diffraction structure 5b produced in this way is made in the regions of layers 5c and 4 directly adjacent to each other. When observing the diffraction structure, depending on the illumination angle and the viewing angle, various optical effects are manifested. .

In the film of FIG. 5a, the layers are arranged in the following order: carrier film 1, removable layer 2, protective layer 3, laser-sensitive layer 4, reflective layer 5r, laser-sensitive layer 4, additional varnish layer 7 and adhesive layer 6 The laser-sensitive layers 4 formed on both sides of the reflective layer 5r can be identical, that is, the reflective layer is then located in this general laser-sensitive layer. Sensitive to laser radiation layers, however, can be performed in various ways. In adjacent regions of the laser-sensitive layers 4 and the reflective layer 5r adjacent to each other, a diffraction structure 5b is formed. Alternatively, structure 5b may be implemented as a hologram structure. Increased anti-fake protection in this embodiment is ensured by the fact that two laser-sensitive layers are adjacent to a diffraction or hologram structure and can be made the same or different. Lacquer layer 7, which is optional, is made as a transparent layer or as a light background layer. Alternatively, the varnish layer 7 and the adhesive layer 6 may be absent, and the second laser-sensitive layer shown in FIG. 5a located below the reflective layer 5r may be configured as a laser-sensitive adhesive layer.

In the film of FIG. 5b, the layers are arranged in the following order: carrier film 1, removable layer 2, laser-sensitive layer 4, additional varnish layer 5c, reflective layer 5r, adhesive layer 6. Layers 5c and 6 can be made of the same material or from different materials. In the case of the laser-sensitive layer 4 in this embodiment, we are talking about a protective layer of varnish, which is made sensitive to laser radiation due to the fact that it contains the corresponding comparable pigments. In adjacent adjacent regions of the additional varnish layer 5c, the reflective layer 5r and the adhesive layer 6, a diffraction structure is made. It can be made as a diffraction grating. Alternatively, structure 5b may also be implemented as a hologram structure.

After the transfer film, in this case the hot stamping film, is applied to the substrate, laser treatment is performed to form transparent and / or color markings in the laser sensitive layer 4. In order to form corresponding colored markings in a certain position in the laser-sensitive layer 4, this place is irradiated with laser radiation.

In the case of laser processing of a film with a layered structure according to FIG. 5, laser irradiation is carried out through the reflective layer, including the diffraction structure 5b. The laser beam is preferably directed from above perpendicular to the plane of the film. The reflection layer 5r is transparent to laser radiation, especially when perpendicular to the radiation. Also, the diffraction or hologram structure 5b of the layer forming the reflection layer 5r in the rest of the region is transparent to laser radiation, and the radiation on the diffraction structure can also more or less diffract or partially reflect. The laser-sensitive layer 4, located under the layer forming the reflective layer 5r in the rest of the region, even within the diffraction structure 5b and below, changes under the influence of the laser, and a color change occurs at a certain place due to bleaching.

The whitening process is described below as it occurs in the illustrated embodiments in the corresponding laser sensitive layer.

In the case of the laser-sensitive material, the laser-sensitive layer is a mixture of three components, namely, a blue pigment component, a red pigment component and a yellow pigment component.

During bleaching, the first stage produces blue, or green, or red color markings, while the specified area is irradiated with laser radiation with a specific wavelength, through which certain components of the pigments are bleached.

To form a blue color, only the yellow pigment component must be bleached. For this, a blue laser light is used. Whitening requires a certain minimum intensity. In addition, a certain pulse duration should not be exceeded. In order to get a green color marking at the first stage, only the red pigment component should be bleached. For this, a green laser light is used. In order to get a red color marking at the first stage, only the blue pigment component should be bleached. For this, a red laser light is used.

In order to form color markings in this area in blue, red or yellow, this area is subjected to laser processing in the second stage, namely, laser radiation with a wavelength through which pigments that have not yet been bleached are bleached in this area. If at the first stage a blue pollen marking is formed, then the blue pigment component and the red pigment component are not bleached in this area. In order to develop a blue color in this area, the red pigment component must be bleached in this second step. This is done by the green light of the laser. Thus, a blue color marking is formed on this site.

If in the second stage, instead of this blue marking, a red color marking is to be obtained, then the blue color marking obtained in the first step should be processed by the red light of the laser. Thus, the blue pigment in this area is bleached, so that in this area the red pigment remains unbleached. Therefore, a red color marking is formed in this area.

Accordingly, it is possible to form a blue color marking or a yellow color marking obtained from the green color marking obtained in the first step, which is formed from the unbleached blue pigment and the yellow pigment there, namely, by processing with a blue laser light or a red laser light, respectively.

Accordingly, the red color marking obtained in the first stage can be converted into a yellow or red color marking in the second stage, namely, by laser processing in the second stage with a green laser light or a blue laser light, respectively.

In order to obtain a transparent region in the region processed in the first and second stages, that is, to obtain a white region if the background layer 5 is white, in the third stage it is necessary to process this region with a laser beam, the wavelength of which is chosen so that the remaining in this region after the second step, the unbleached pigment component is bleached, that is, the yellow color marking should be bleached with blue laser light, the red color marking should be bleached with green light, and the blue color marking should be elivatsya red laser light.

Similarly, thereafter, other adjacent portions are processed in the laser-sensitive layer 4 to form other color markings in the hot stamping layer 4. Thus, a full-color image can be produced.

Laser processing can also be used to form color markings or a full-color image in a dye or dyes in a laser-sensitive layer by changing the color. Laser processing can be suitably carried out by successive steps of the method. As dyes, i.e. color-forming substances, pigments may be used. They are most often insoluble, and, as a rule, we are talking about inorganic substances. Most often, soluble organic dyes can also be used as dyes. Color change occurs under specific conditions of laser processing, which are used in laser processing at individual stages.

Laser processing of the transfer film to form color markings can alternatively be carried out before applying the film, namely, if the protective layer 3 is performed as an opaque or partially transparent layer for laser radiation, or as a layer opaque for laser radiation in a certain wavelength range or if an additional ultraviolet absorbing protective layer is provided. The laser treatment is then carried out before applying the film, with the laser beam being directed to the back of the film, that is, to the background layer 5 or to the adhesive layer 6, and thereby the laser-sensitive layer 4 is processed on the other hand to get color markings therein the same way. The background layer 5 and the adhesive layer 6 in such applications are transparent or at least partially transparent to the respective laser radiation.

Correspondingly, color markings can also be formed in laminated films. Such laminated films are shown in FIGS. 6-10. The laminated film 6 includes a so-called coating film 30, an optional intermediate layer 31, a laser-sensitive layer 40, an intermediate layer 50 forming a background layer, which is also optional, and an adhesive layer 60, which is also optional. During lamination, the laminated film is applied to the substrate with the adhesive layer 60 facing the surface of the substrate. By means of the adhesive layer 60, an adhesive bond is made to the surface of the substrate. The coating film 30 then forms an upper protective layer, the surface which is turned away from the substrate, forms the outer surface of the film. Thus, the coating film 30 remains there after application of the laminated film. It corresponds to the protective layer 3 of the hot stamping film of figure 1. The laser-sensitive layer 40 corresponds to the laser-sensitive layer 4, that is, the first varnish layer 4 of the hot stamping film in FIG. The intermediate layer 50 corresponds to the background layer 5, that is, the second varnish layer 5 of the hot stamping film in FIG. The adhesive layer 60 corresponds to the adhesive layer 6 of the hot stamping film in figure 1.

The laminated film of FIG. 6a represents a modification of the laminated film shown in FIG. 6, according to which, as in the hot stamping film of FIG. 1c, there is no background layer 50 corresponding to the background layer 5.

The laminated films of FIGS. 7 and 8 are variants of the laminated film of FIG. 6, in which the background layer is appropriately changed as the background layer in the hot stamping films of FIGS. 2 and 3.

The laminated film of FIG. 9 has a layer structure with a change in the order of the layers one above the other compared with FIGS. The sequence of layers corresponds to the structure of the hot stamping film of FIG. 5. Here, layer 70 is an optional background layer.

On figa shows a variant, modified in comparison with the embodiment on fig.9, with a sequence of layers corresponding to the structure of the hot stamping film on figa.

The laminated film of FIG. 10 is a variant of the laminated film of FIG. 9. In this embodiment, the coating film 30 is provided with a hot stamping film applied thereto. This hot stamping film applied thereon replaces the layers 31, 50 or 50r, 40, 70 and 60 provided for in the laminated film of FIG. 9 with the corresponding layers of the hot stamping film. In the case of the hot stamping film used to make this laminated film, in contrast to the hot stamping film of FIG. 5, the reflective layer 5r and the laser-sensitive layer 4 are arranged in the reverse order, so in the case of the laminated film of FIG. 10, according to the case of the case of the laminated film of FIG. 9, the reflective layer 5r is arranged on the side of the laser-sensitive layer 4 turned away from the substrate. According to the other shown embodiments, guides each other fields layers 4 and 5 in the laminated film 10 is formed on diffractive structure 5b. The varnish layer 5 is thus made as a transparent layer.

The laminated film of FIG. 10a is made similarly to the laminated film of FIG. 10. In the embodiment of FIG. 10a, the coating film 30 is provided with a hot stamping film deposited thereon, which is formed similarly to the hot stamping film in the embodiment of FIG. 5a. This hot stamping film applied to the coating film 30 replaces the layers 31, 40, 50, 50r, 40, 70 and 60 provided in the laminated film of FIG. 9a with the corresponding layers of the hot stamping film. The laminated film of FIG. 10a has a sequence of layers arranged in the following order: coating film 30, adhesive layer 6, optional varnish layer 5, laser-sensitive layer 4, reflective layer 5r, laser-sensitive layer 4, additional varnish layer 5c and a protective layer 3. The laser-sensitive layers 4 formed on both sides of the reflective layer 5r can be identical, i.e. the reflective layer is then placed in this laser-sensitive common layer. However, the laser-sensitive layers 4 can be made different. Lacquer layer 5 is in this case made as a transparent layer or as a light background layer.

The laminated film of FIG. 10b represents an embodiment in which a hot stamping film is also applied to the coating film 30. This deposited hot stamping film is made similar to the film shown in Fig.5. It replaces the layers 31, 40, 50 or 50r, 40, 70 and 60 provided for in the laminated film of FIG. 9a with the corresponding layers of the hot stamping film. The laminated film of FIG. 10b has a sequence of layers arranged in the following order: coating film 30, adhesive layer 6, optional varnish layer 7, laser-sensitive layer 4, reflective layer 5r, additional varnish layer 5c and protective layer 3. Layer 7 the varnish in this case is made as a transparent layer or as a light background layer.

Laser processing of the laminated film is carried out accordingly, as described for a hot stamping film, that is, by appropriate sequential bleaching of pigments or other dyes contained in the laser-sensitive layer 40, or by corresponding color changes of pigments or other dyes.

Transfer films and laminated films with a film structure, as described above with reference to FIGS. 1-10, are applied to a substrate consisting of paper material using the described application method. In the case of a substrate, it can preferably be a card base laminated from several inserts, which at least partially consist of paper material. In this case, when a film is deposited, corresponding multilayer bodies are created, which respectively comprise at least one layer 4 or 40 sensitive to laser radiation. Due to the above-described laser processing, color markings can be generated in the laser sensitive layer. Embodiments of such multilayer bodies with laser-induced markings are described below with reference to FIGS. 11a, 11b and 12, 12b.

In the embodiments of FIGS. 11a and 11b, the transfer film of FIG. 1a is applied to the substrate 8 made of paper material. As shown in the sectional view of FIG. 11b, the multilayer body consists of a protective layer 3 that is sensitive to laser radiation layer 4, the adhesive layer 6 and the substrate 8, and on the surface of the substrate 8 there is a special marking 81. In the case of this marking 81 we can talk about a separate layer deposited on the substrate. As shown in the top view of FIG. 11a, the marking 81 consists of various marking elements, including a protective seal 81d, which can be printed as guilloche, and fluorescent threads 81f, which can preferably fluoresce only in ultraviolet light, and when daylight appear as black threads. In addition, watermarks 81w as well as a security strip 81s are also provided on the substrate 8. The security strip 81s may be a strip or filament element that may have a diffraction and / or hologram structure, and additional security features, such as laser-induced markings and the like. In the laser-sensitive layer, as can be seen from Fig. 11a, a laser-induced image 10y is made. This laser-induced image 10y may be formed as a full-color image by the whitening method described above. The laser-induced image 10y is formed only in a partial region of a rectangular shape on the surface of the base 8 of the card. Preferably, the entire transfer film with the laser-sensitive layer 4 can be applied solely on this portion of the base 8 of the card. The rectangular region of the laser-induced image 10y, as can be seen from Fig. 11a, is transparent, that is, the indicated region of the laser-sensitive layer by laser processing is bleached so that the colored parts of the image become transparent colored with shades, and the area around the markings is bleached until completely transparent. This provides an advantage in that the marking 81 based on the card 8 is viewed through the laser-induced image 10y. Due to this, a particularly high degree of protection against counterfeiting is achieved.

In the embodiment of FIGS. 12a and 12b, in contrast to the embodiment of FIGS. 11a and 11b, a transfer film with a layer structure according to FIG. 1 is used. Thus, it has, in addition to layers 3, 4, 6, a background layer 5 formed between the laser-sensitive layer 4 and the adhesive layer 6. This background layer 5 is reflective for the laser radiation used in image formation, and for non-reflected parts of the laser radiation is largely opaque and absorbent. This special background layer ensures that the marking 81, which is located under the laser-induced image 10y, is optically closed, that is, it is not recognized from the outside in the light of the visible spectral range. The background layer 5 due to light reflection and the corresponding additionally available in the background layer 5 brightening substances can cause color enhancement and / or lightening of the laser-induced color image 10y. In addition, the background layer 5 ensures that under the influence of the laser when generating the laser-induced image 10y, the underlying layers, i.e. in particular, the substrate 8 is not damaged by laser radiation, and any other undesirable changes due to laser radiation do not occur in the layers or the substrate.

13-15, various multilayer bodies are shown made by laminating various coating films 30 and inserts 90 made of paper material. In all of these embodiments, at least one laser-sensitive layer 4 is provided. It is arranged respectively in a laminated film, which in its structure essentially corresponds to the films shown in FIGS. 10, 10a and 10b, which are laminated films, which are made by applying a transfer film to the coating film 30. Hm implementation of Figures 14 and 15 is further provided with another laser-sensitive layer in the form of carbon doped and / or carbon black coating film 32. It is located under the covering film 30 provided with a transfer film. In the embodiment of FIG. 15, a background layer 5 is formed between the laser-sensitive layer 4 and the doped coating film 32. The background layer 5 is comparable in performance and function to the background layer 5 of the embodiment of FIGS. 12a and 12b.

Claims (50)

1. A multilayer body containing a substrate, which consists of paper material and a single layer or multilayer layered structure, originating from a transfer film having an adhesive layer, or coming from a laminated film having an adhesive layer in which the layered structure contains at least one sensitive to laser radiation layer containing a laser-sensitive material, and the laser-sensitive material contains at least one dye that can be bleached under the action of laser radiation, while at least one of the specified dye is made in the form of a pigment, while the specified laser-sensitive material is made so that color marking or black marking can be formed in at least one layer sensitive to laser radiation, by means of a laser exposing at least one laser-sensitive layer, wherein at least one laser-sensitive layer is applied as part of the transfer film or laminated film to the substrate, consisting of paper material, while the adhesive layer forms an adhesive bond with the substrate. 2. The multilayer body according to claim 1, characterized in that the laser-sensitive material further comprises a material that is capable of blackening under the action of laser radiation. 3. The multilayer body according to claim 2, characterized in that the material, made with the possibility of blackening, is blackened on a brightness scale. 4. A multilayer body according to one of claim 2 or 3, characterized in that the material made with the possibility of blackening is a material doped with carbon or carbon black. 5. A multilayer body according to one of claims 1 to 3, characterized in that the laser-sensitive material has at least one additional dye that changes its color under the influence of a color-changing laser. 6. A multilayer body according to one of claims 1 to 3, characterized in that the laser-sensitive material is made as a mixture of dyes, which is composed of several different components of the dyes, and for at least two components the condition is valid that under conditions of laser radiation specific to one component, the other component does not change or essentially does not change. 7. The multilayer body according to claim 5, characterized in that the laser-sensitive material is made as a mixture of dyes, which is composed of several different components of the dyes, and for at least two components the condition is valid that under conditions of laser radiation specific to one component, another component does not change or essentially does not change. 8. The multilayer body according to claim 6, characterized in that the dye mixture is made of at least three different dye components, each of the three dye components being made as a pigment and can be bleached by laser under laser radiation conditions specific to the corresponding component, and for of each of the three components, the condition is that under laser conditions specific to one component, the remaining components do not bleach or, essentially, do not bleach. 9. The multilayer body according to claim 7, characterized in that the dye mixture is made of at least three different dye components, each of the three dye components being made as a pigment and can be bleached by laser under laser radiation conditions specific to the corresponding component, and for of each of the three components, the condition is that under laser conditions specific to one component, the remaining components do not bleach or, essentially, do not bleach. 10. The multilayer body according to claim 6, characterized in that the laser-specific conditions for the various components differ in the laser wavelength and under the specific laser-specific conditions for the respective component, the remaining components do not bleach or essentially do not bleach. 11. A multilayer body according to one of claims 7 to 9, characterized in that the laser-specific conditions for the various components differ in the laser wavelength and under the specific laser-specific conditions for the respective component, the remaining components do not bleach or essentially do not bleach. 12. The multilayer body according to claim 6, characterized in that in one place of at least one layer sensitive to laser radiation placed several or all of the various components of the mixture of dyes and the color in this place is formed by subtractive color mixing. 13. A multilayer body according to one of claims 7 to 10, characterized in that several or all of the various components of the dye mixture are placed in one place of at least one laser-sensitive layer and the color in this place is formed by subtractive color mixing. 14. The multilayer body according to claim 11, characterized in that in one place of at least one layer sensitive to laser radiation placed several or all of the various components of the mixture of dyes and the color in this place is formed by subtractive color mixing. 15. A multilayer body according to one of claims 8 to 10, characterized in that the component absorbs light at the wavelength of the laser light used for the bleaching operation, while the component at this wavelength has a maximum absorption. 16. The multilayer body according to claim 11, characterized in that the component absorbs light at the wavelength of the laser light used for the whitening operation, while the component at this wavelength has a maximum absorption. 17. A multilayer body according to claim 12 or 14, characterized in that the component absorbs light at the wavelength of the laser light used for the whitening operation, while the component at this wavelength has a maximum absorption. 18. The multilayer body according to item 13, wherein the component absorbs light at the wavelength of the laser light used for the bleaching operation, while the component at this wavelength has a maximum absorption. 19. A multilayer body according to one of claims 8 to 10, characterized in that the component absorbs light at the wavelength of the laser light used for the bleaching operation, but the component at this wavelength does not have an absorption maximum and this wavelength lies outside the maximum absorption or beyond the absorption maximums of the component. 20. The multilayer body according to claim 12, characterized in that the component absorbs light at the wavelength of the laser light used for the bleaching operation, but the component at this wavelength does not have an absorption maximum and this wavelength lies outside the absorption maximum or outside the maxima absorption component. 21. The multilayer body according to claim 6, characterized in that the mixture contains only three components of the dyes or more than three components of the dyes. 22. The multilayer body according to claim 7, characterized in that the mixture contains only three components of the dyes or more than three components of the dyes. 23. The multilayer body according to claim 6, characterized in that the component is a blue dye, and / or the component is a purple dye, and / or the component is a yellow dye. 24. The multilayer body according to claim 7, characterized in that the component is a blue dye, and / or the component is a purple dye, and / or the component is a yellow dye. 25. The multilayer body according to item 23 or 24, characterized in that the blue dye is a blue pigment, and / or the purple dye is a purple pigment, and / or the yellow dye is a yellow pigment. 26. The multilayer body according to item 23 or 24, characterized in that the blue dye is made as a dye bleached exclusively by red laser light, and / or the magenta dye is made as a dye bleached exclusively by green laser light, and / or the yellow dye is made as a dye whitened exclusively by blue laser light. 27. The multilayer body according A.25, characterized in that the blue dye is made as a dye bleached exclusively by the red light of the laser, and / or the purple dye is made as a dye bleached exclusively by the green light of the laser, and / or the yellow dye is made as a dye bleached exclusively blue laser light. 28. A multilayer body according to one of claims 1 to 3, characterized in that between the at least one laser-sensitive layer and the substrate, a background layer is made, which for laser radiation acting upon laser processing of the laser-sensitive material is preferably made highly reflective and / or, in particular, for the non-reflected part of the laser radiation is made opaque or substantially opaque and / or absorbing. 29. A multilayer body according to claim 28, characterized in that the background layer for light in the visible spectral range is transparent, and / or for laser radiation only under certain conditions, is transparent or opaque. 30. The multilayer body according to clause 29, wherein the background layer for laser radiation, which is used to form a laser-induced marking in at least one laser-sensitive layer, is transparent or opaque. 31. A multilayer body according to claim 28, characterized in that the background layer is placed exclusively in the region under at least one laser-sensitive layer. 32. The multilayer body according to p. 31, characterized in that the background layer is placed exclusively in the area under at least one laser-sensitive layer, which provides for the placement of laser-induced markings. 33. A method of manufacturing a laser-induced marking on or in a multilayer body according to one of claims 1 to 32, characterized in that the multilayer body is irradiated with laser radiation and wherein at least one laser-sensitive layer under the influence of laser radiation forms a laser-induced marking by bleaching or by bleaching and at least one color change and blackening of laser-sensitive material. 34. The method according to p. 33, in which a multilayer body according to one of claims 6-32 is used with laser-sensitive material with two or three whitened components, while in the first step by laser irradiation of the area of at least one sensitive to laser radiation of a layer under specific laser conditions specific to one of two or three components, only this one component is bleached, and in the second stage, by laser irradiation of the same area of at least one sens A layer that is laser-sensitive under specific laser conditions specific to the other of the two or three components, only this other component is bleached. 35. The method according to clause 34, wherein in the third stage, by laser irradiation of the same section of at least one layer sensitive to laser radiation under laser-specific conditions for the next other of the three components, only this subsequent other component is bleached on said a portion of at least one laser sensitive layer. 36. The method according to clause 34, characterized in that at the n-th stage by laser processing of the same section of at least one layer sensitive to laser radiation under specific laser conditions specific for the n-th component, only this n-th component is bleached , and n is greater than 3. 37. The method according to clause 35, characterized in that at the n-th stage by laser processing of the same area of at least one layer sensitive to laser radiation under specific laser conditions specific for the n-th component, only this n-th component is bleached , and n is greater than 3. 38. The method according to one of paragraphs 34-37, characterized in that by laser irradiation of the specified area of at least one layer sensitive to laser radiation, all components are bleached. 39. The method according to one of paragraphs 33-37, characterized in that when laser irradiation by adjusting the conditions of the laser treatment, a predetermined degree of whitening is established. 40. The method according to § 38, characterized in that when the laser irradiation by adjusting the conditions of the laser processing is set to a predetermined degree of whitening. 41. The method according to § 39, wherein the adjustable laser processing conditions are the intensity of the laser radiation, and / or the duration of the pulse, and / or the exposure time. 42. The method according to one of claims 33-37, characterized in that at least one of the components undergoes a color change during laser irradiation. 43. The method according to one of claims 33-37, characterized in that at least one laser-sensitive layer is irradiated with laser radiation in a plurality of regions in series. 44. The method according to one of claims 33-37, characterized in that several different components or all of the various components in the mixture are placed in one region of at least one laser-sensitive layer or the color of this region is formed by subtractive color mixing. 45. The method according to one of paragraphs 33-37, characterized in that as a component use a blue dye and / or purple dye and / or yellow dye. 46. The method according to item 45, wherein the component is a blue pigment, and / or a purple pigment and / or yellow pigment. 47. The method according to item 45, wherein the laser dye is used to bleach the blue dye, and / or the laser diode is used to bleach the purple dye, and / or the laser diode is used to bleach the yellow dye. 48. The method according to item 45, wherein the blue color is formed by a superposition of cyan and magenta, and / or the green color is formed by a superposition of cyan and yellow, and / or the red color is formed by a superposition of yellow and magenta, and / or black or gray is formed by a superposition of cyan, magenta, and yellow, and / or magenta is formed by magenta dye by bleaching dyes contained in a mixture of dyes, excluding magenta, and / or cyan is formed by cyan dye by whitening the remaining dyes in the dye mixture, excluding the blue dye, and / or yellow forms a yellow dye, by bleaching all the dyes in the dye mixture, excluding the yellow dye. 49. The method according to p, characterized in that the blue color is formed by subtractive mixing of cyan and magenta, and / or the green color is formed by subtractive mixing of cyan and yellow, and / or the red color is formed by subtractive mixing of yellow and magenta and / or black or gray is formed by subtractive mixing of cyan, magenta and yellow, and / or magenta is formed by magenta dye by bleaching dyes contained in a mixture of dyes, excluding magenta, and / or cyan vet form yellow dye by bleaching the remaining dyes in dye mixture, excluding the cyan dye and / or yellow form a yellow dye, by bleaching of the dyes in dye mixture, excluding yellow. 50. The method according to § 49, wherein the blue color is formed by subtractive mixing the dye mixture with the blue dye, the purple dye and the yellow dye by bleaching the yellow dye, and / or the green color is formed by the subtractive mixing of the dye mixture with the blue dye, the purple dye and the yellow dye by bleaching the purple dye and / or the red color is formed by subtractive mixing the dye mixture with the purple dye, the yellow dye and the blue dye by the whitening of the blue dye and / or black or gray color is formed by subtractive mixing of the dye mixture with the magenta dye, the yellow dye and the blue dye and / or the magenta color is formed from the dye mixture comprising the magenta dye, the yellow dye and the cyan dye by whitening the yellow dye and cyan dye, and / or cyan is formed from a mixture of dyes, including cyan dye, yellow dye and magenta dye, by bleaching the magenta dye and a yellow dye and / or yellow color is formed from a mixture of dyes, including a yellow dye, a magenta dye and a cyan dye, by bleaching the magenta dye and cyan dye.

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