RU2503547C2 - Method of manufacturing security or valuable document - Google Patents

Abstract

FIELD: printing.

SUBSTANCE: invention relates to a method of manufacturing a security or valuable document, which includes the following steps: B) multilayer material is produced, which comprises a paper substrate, a masking layer provided on the paper substrate in the masking area, and marking substance modified by laser radiation, provided in the marked area, at that the marked area covers the masking area, and L) the multilayer material in the marked area is subjected to laser action in order to create the negative signs in the masking area simultaneously in register and discolored signs on unmasked areas of the marked area. At that before performing the step L) on the masking layer at least in the marked area the recesses are made in the form of patterns, signs or a code.

EFFECT: invention provides a high degree of protection against forgery.

25 cl, 22 dwg

Description

The present invention relates to a method for manufacturing a security or value document and a method for manufacturing a security element. In addition, the present invention relates to a security or security document and security element made in accordance with the proposed methods.

Protected or valuable documents, such as banknotes, identity cards and other similar documents, are often equipped with various security elements to protect against counterfeiting, which allow to establish the authenticity of documents and at the same time protect these documents from illegal copying. However, due to the tolerance of register accuracy due to manufacturing technology, aligning two or more different security elements relative to each other so that they complement each other and form a common structure is usually very difficult.

Thus, the objective of the present invention is to eliminate the disadvantages of the means known from the prior art and, in particular, to offer secure and valuable documents with a high degree of protection against counterfeiting, with an attractive appearance.

To solve this problem, a manufacturing method, a protected or valuable document and a security element in accordance with the independent claims are proposed. Preferred embodiments of the present invention follow from the dependent claims.

In accordance with the first aspect, the present invention relates to a method for producing a security or valuable document, characterized in that it includes the following steps:

C) a multilayer material is prepared comprising a paper substrate, a mask layer provided on the paper substrate in the masking region, and a laser-modified marking agent provided in the markable region, the markable region overlapping the mask region, and

L) the multilayer material in the marked area is subjected to laser irradiation in order to simultaneously create negative signs in the masking layer and signs with a changed color in unmasked areas of the marked area with accurate register registration.

Due to the fact that two different signs are made with the exact register, an attractive marking is created from the point of view of visual perception, which allows checking the authenticity of the document, which has an original design and is formed by two different signs on a protected or valuable document. In addition, due to tolerances of register accuracy, which are unavoidable with the separate manufacture of signs, their relative alignment for third parties will be very difficult. Thus, a protected or valuable document has a high degree of protection against counterfeiting.

In accordance with the present invention, for example, a metal layer can be used as a masking layer, as well as dielectric layers, in particular dielectric layers that change color depending on the viewing angle, or color printed layers. In the case of using metal layers, by subjecting the multilayer material to laser exposure, it is possible to ensure the matting of the metal and, thus, with accurate registering, perform the transition from areas with a changed color to a frosted metal coating. In the case of using thin-film elements with a color-changing effect depending on the viewing angle, which usually contain a translucent absorbing layer of chromium, a dielectric separation layer and an aluminum reflecting layer, exposed to laser radiation, it is possible to remove only the translucent chromium layer, resulting in negative sign in the background, changing color depending on the viewing angle, a light gray area is formed.

Preferably, in step L), characters with a changed color and negative characters are created that complement each other, forming general information. Signs with a changed color and negative signs are, for example, complementary elements of letters, inscriptions, sequences of numbers, a logo or a single graphic object. In order for these elements to complement each other to general information and at the same time correctly convey its semantic content and look attractive from the point of view of visual perception, signs with a changed color and negative signs must be precisely aligned relative to each other. The correct marking, which allows to establish the authenticity of the document and formed by the two indicated characters, the user can determine without auxiliary means and understand without comment.

Preferably, in step B), the paper substrate and the mask layer are coated with a marking agent, for example by printing.

To obtain additional color transitions before applying a marking substance on a paper substrate, some of its sections are covered with the first layer, which allows laser exposure to provide a change in the color effect of the marked area. Alternatively, or in addition, the first layer may contain one laser modifiable marking substance, which allows laser signs in step L) to create signs with a changed color in areas covered with the first layer, providing different color effects.

Instead of applying a substance with specific properties to the paper substrate, it is advisable in step B) to introduce a labeling substance into the volume of the paper substrate. To do this, the marking substance, for example, is added to the paper pulp when forming sheets, it is introduced into the paper substrate when immersed in a bath or the paper substrate is impregnated with the marking substance in a size press. Obviously, you can use other methods of coating, for example the application of a substance having specific properties, by irrigation or smearing.

In accordance with a preferred embodiment of the invention, before stage L) is subjected to laser treatment of the multilayer material, recesses in the form of patterns, characters or a code are made on the masking layer at least in the marked area. In this case, when laser exposure is preferably formed negative signs, the information content of which is related in meaning to the information content of the recesses provided in the masking layer. Moreover, the two indicated information objects are related to each other in meaning if they are related to each other or complement each other. For example, the second information object may indicate the first, fully or partially repeat it, or supplement it with general information.

According to a preferred embodiment of the invention, the mask layer in step B) is applied to the film layer and, together with the film layer, is applied to the paper substrate. The masking layer is, for example, a reflective layer of an embossed and metallized diffraction structure or a reflective layer of a thin-film element with the effect of a color change depending on the angle of view. However, the present invention is not limited to these options, in particular, the masking layer can also be applied directly to the paper substrate without using a film layer.

In an embodiment of the invention, according to which a film layer is used, said layer may also contain one laser-modifiable marking substance, which allows, in step L), to create signs with different color effects at the unmasked sections of the film layer simultaneously and with exact observance of register. Moreover, signs with a changed color on unmasked areas of the paper substrate, signs with a changed color on unmasked areas of the film layer and negative signs, in particular, are created in such a way that they complement each other, forming general information. In all embodiments, the film layer can be coated with a labeling agent, or the labeling agent can be introduced into the bulk of the film layer.

In step L), a laser emitting in the infrared is preferably used as a laser source, in particular a carbon dioxide laser with a wavelength of about 10.6 μm or a neodymium doped yttrium aluminum garnet laser (Nd: YAG) with a wavelength of 1.064 μm .

The present invention also provides a protected or valuable document made in accordance with the proposed method and comprising a multilayer material comprising at least one paper substrate, a mask layer provided on the paper substrate in the mask region, and a laser-modifiable marking agent provided in the markable areas, and when laser exposure in the masking layer negative signs are formed, and on unmasked areas of the marked area - signs with changes nnym color, said signs are made to exact register control.

According to a second aspect, the present invention relates to a method for manufacturing a security element, characterized in that it includes the following steps:

C) a film layer is made that in the masking area contains a masking layer with recesses in the form of patterns, signs or code, and in the marked area that overlaps the masking area, laser-modified material, the marking substance, and L) the film layer in the marked area is subjected to laser exposure in order to simultaneously create negative signs in the masking layer and signs with a changed color at the unmasked areas of the film layer with accurate register registration.

According to this aspect of the invention, it is also possible to use a metal layer or dielectric layers, for example dielectric layers that change color depending on the angle of view, or color printed layers, as a masking layer.

At the same time, at stage L), signs with a changed color and negative signs are created that complement each other, forming general information. In addition, it is preferable to create negative signs and / or signs with a changed color, the information content of which is related in meaning to the information content of the recesses made in the masking layer.

In accordance with the proposed method, in step L), a laser emitting in the infrared is preferably used, in particular a carbon dioxide laser with a wavelength of about 10.6 μm or a neodymium doped yttrium aluminum garnet laser (Nd: YAG) with a wavelength of 1.064 μm .

In addition, in all embodiments of the present invention, it is possible in step L) to create rasterized negative signs. As a result, when superimposing negative signs and signs with a changed color, one can obtain such variants in which, for example, the holographic structure of the metal masking layer remains visible in reflected light even in the region of the negative sign.

The present invention also relates to a protective element made in accordance with the proposed method and containing a film layer, which in the masking area contains a masking layer with recesses in the form of patterns, signs or code, and in the marked area that overlaps the masking area contains a laser-modified marking substance, and when laser exposure in the masking layer, negative signs are formed, and on non-masked areas of the film layer - signs with a changed color, while Naki made to exact register control.

The security element is preferably a security thread, a security tape, a protective film, a patch, a sticker or other transfer element for applying onto security paper, a valuable document and other such documents. Along with the films described in more detail below, which are applied to security paper or a valuable document, in the present invention, in particular, patches or coated or non-cached security threads can be used. In the case of using laced security threads instead of a carbon dioxide laser, a neodymium doped yttrium aluminum garnet laser (Nd: YAG) with a wavelength of 1.064 μm, the beam of which penetrates through the laminating film, is preferably used.

In all embodiments of the present invention, laser-modifiable marking agents use, for example, effect pigments that change the visible color under the influence of laser radiation, in particular thermosetting color pigments, for example blue ultramarine. Obviously, instead of the indicated pigments with effect, it is possible to use a laser-modified marking substance that does not contain pigments.

In all embodiments of the present invention, in step L), color-changed characters can be made in a color that changes when observed under normal environmental conditions. Moreover, observation under ordinary external conditions implies observation in daylight or artificial light, without special exposure to a protected or valuable document. Alternatively, or in addition, signs with a changed color in step L) are created with a luminescence color that appears when illuminated with exciting radiation. When observing under normal ambient conditions, the indicated luminescence color cannot be seen, it appears only when the protected or valuable document is illuminated with the corresponding exciting radiation, and ultraviolet radiation is usually used as the exciting radiation. In these embodiments, luminescent, in particular fluorescent pigments, are used as laser-modified marking agents. Luminescent substances with characteristic properties when observed under ordinary external conditions, preferably appear as transparent and / or colorless substances.

Further, additional embodiments and advantages of the present invention are explained with reference to the accompanying drawings. In order to facilitate understanding of the drawings, some elements are depicted without scaling.

The drawings depict the following.

Figure 1 schematically shows the proposed secure banknote.

Figure 2 shows a fragment of figure 1, illustrating the edge of a metallized film.

Figure 3 shows a sectional view along the line III-III: a - before laser exposure, b - after laser exposure.

In figure 4. shows a top view of the edge section of the proposed protected metal layer located on a paper substrate: a is the state before laser exposure, b is the state after laser exposure.

Figure 5 shows: a is a top view of an edge portion of a metal layer located on a paper substrate according to another embodiment of the present invention, b is a sectional view along line BB of Fig. 5a.

Figure 6 shows: a is a top view, b is a sectional view of the proposed protected metal layer with a multi-level color effect.

Figure 7 shows: a and b are a sectional view, as in figure 3, before and after laser irradiation, respectively, c is a top view of the edge portion of the proposed film when observed under normal environmental conditions, d is the appearance of fragment c when ultraviolet radiation.

On Fig depicted: a and b are top views, as in Fig.7c and 7d in accordance with another embodiment of the present invention.

Figure 9 shows: a and b are top views, as in figs and 7d, in accordance with another embodiment of the present invention.

Figure 10 shows: a - rasterized overlap of negative signs and signs with a changed color, b and c - appearance of the structure of figure 10 a when observed in reflected light and, accordingly, in transmitted light.

11 shows a cross section of a film made in accordance with a further embodiment of the invention.

The present invention is illustrated by the example of banknotes. Figure 1 schematically shows a banknote 10 containing a paper substrate 12 and a through hole 14 coated with a metallized film 16. The metal layer 18 of the film 16, as a rule, is part of an embossed metallized diffraction structure or thin-film element with the effect of a color change depending on the angle view. However, the present invention is not limited to this embodiment. In General, the present invention can be used for the manufacture of multilayer materials containing paper substrates with metal layers, dielectric layers or color printing layers.

To protect the banknote 10 from counterfeiting along the edge of the metallized film 16, a marking 20 is provided consisting of a colored sign 22 made in the paper substrate 12 and a negative sign 24 formed in the metal layer 18 of the film 16, and these signs 22 and 24 are made with high accuracy register.

In accordance with this embodiment of the invention, marking 20 is formed by the sequence of letters "PL". However, it is obvious that this marking can be represented in the form of any sequence of letters or numbers, graphic patterns or codes. As shown in detail in figure 2, in the considered embodiment of the invention, the upper part of the sequence of letters "PL" is formed by a red sign 22 located in the paper substrate. The lower part of the sequence of letters "PL", exactly aligned with the specified upper part, is formed by a negative sign 24 located in the metal layer 18, and in this embodiment of the invention, this negative sign appears in the form of a white colored paper substrate on the metal background of the film 16.

To ensure accurate alignment of these signs 22 and 24 and, thereby, to form a solid marking 20 without gaps, first, as shown in sectional view from figa, on the paper substrate 12 is applied a film 16 containing a metal layer 18. Then on a paper the substrate 12 and the metal layer 18, on a significant surface of the marked region 30, a marking layer 32 is applied containing a laser-modifiable marking substance which, under the influence of the laser, changes its color accordingly, for example, from a transparent about to red.

After that, a multilayer material containing a paper substrate 12, a metal layer 18 and a marking layer 32 in the marking region 30 is exposed to laser radiation 34 and, correspondingly controlling the laser beam, create a marking 20 of the desired shape. As a source of laser radiation, for example, a carbon dioxide laser with a wavelength of 10.6 μm is used, which allows the necessary marking to be applied at high speed.

On fig.3b shows a section of a banknote along the line III-III, shown in figure 2, after laser marking. When conducting experiments, the inventors unexpectedly found that using the same set of laser parameters, it is possible to provide a laser-induced color change of the marking substance contained in the marking layer 32, and thereby create color signs 22 in the paper substrate, as well as provide local removal of metallic layer 18 of the film and as a result create negative signs 24 in the metallized film 16.

Thus, due to the fact that the signs 22 and 24 are created at the same stage using the same laser beam, they are precisely aligned relative to each other. Moreover, the essence of the present invention is that, although the marking 20 may have register-related deviations of the register relative to the edge of the metal layer 18, the signs 22 and 24 created simultaneously do not have register deviations relative to each other. Thus, these signs complement each other, forming a solid marking 20, without gaps and displacement.

In the region of sign 24, laser irradiation does not cause a color effect in the marking layer 32, but only leads to the formation of a negative sign in the metal layer 18. Based on current knowledge, this can be explained as follows: when the metal layer 18 is removed along with the evaporation of the metal, the laser-modified radiation of the marking substance, as schematically shown in fig.3b. Together with the metal, obviously, other layers are removed, if necessary provided on the film, for example, an embossed layer of UV varnish (not shown in the drawings), as a result of which the white color of the paper substrate 12 located under the film appears in the negative sign region 24.

According to the embodiment of the invention shown in FIG. 4, the metal layer 40 of the film 16 further comprises recesses 42 made in the form of patterns and micro letters made, for example, by a washing method, as disclosed in patent document WO 99/13157. As shown in detail in figa, along the edge of the metal layer 40 inside each rectangular recess 44 made in the metal layer, there is a metal micro letter "D" (position number 46). Obviously, the example shown here illustrates one of the possible options for the information represented by the recesses 42, this information can be of any kind, in particular it can be microprint.

To create marking 20, a film 16 containing a structured metal layer 40, 42 is applied to the paper substrate 12. Then, the paper substrate 12 and the metal layer 40, 42 in the marked area on its significant surface are coated with a marking layer, after which the multilayer material is subjected to laser exposure creating located on top of the marking 20, which in this embodiment is represented as a sequence of letters "PL".

As shown in FIG. 4b and essentially disclosed in the description of FIG. 3, laser radiation in areas without a metal layer causes a color change of the marking substance from transparent to red. Thus, in the paper substrate 12, and in areas of the film 16 without a metal layer, a red sign 48 is formed. Conversely, when laser irradiation of metallized areas occurs, the removal of the marking substance with the metal layer 40 occurs, as a result of which through these sections 50 you can see the white background of the paper substrate 12.

In particular, in the areas affected by the laser, the micro-letters 46 form white microprints without a metal layer on the red background of the sign 48. In those places where the laser radiation affects the micro-letters 46 partially, metallized parts of the micro-letters 46, parts of the micro-letters 46 are white the metal layer, as well as the sign 48 of the red color are precisely aligned relative to each other. It is important that, although the marking 20 may have register deflections due to manufacturing technology relative to the edges of the metal layer 40 and recesses 42 with micro letters 46 formed therein, simultaneously created characters 48 and 50 do not have register deflections relative to each other. Thus, they complement each other, forming an integral marking 20 without gaps and displacements.

According to another embodiment of the present invention, shown in FIG. 5, a first layer 52 is applied to the paper substrate 12, which provides an additional color transition of the marking 20. The first layer 52 is, for example, a varnish layer that is applied before applying the metallized film 16 to the paper substrate 12 and which, as a rule, ensures alignment of the paper, better adhesion of the film 16 and / or a brighter appearance of the film.

It has been unexpectedly found that by properly selecting the marking substance and the first layer, it is possible to influence the color change of the marking substance through the first layer. As shown in the top view of FIG. 5 a and the sectional view along line BB (FIG. 5 a) shown in FIG. 5 b, the width 54 of the first layer 52 is such that it extends beyond the metallized film 16.

During laser irradiation, the marking substance in the region of the first layer 52 changes its color, for example, from transparent to orange, thus, an orange sign 62 is formed in the paper substrate 12. Moreover, in the region 56 located outside the first layer 52, the color of the marking substance changes from transparent to red and, thus, a red sign 60 is formed in the paper substrate. The precisely aligned color signs 60, 62, as described above, are also precisely aligned with the negative signs 64 made in the metal layer.

In addition, the first layer 52 may contain a laser-modifiable marking substance, which makes it possible to provide different color effects in areas 54 coated with the first layer under laser irradiation.

In accordance with another embodiment of the present invention, the marking 20 is created with several color transitions, as shown in FIG. 6 a in plan view and in FIG. 6 b in cross section. In this case, the paper substrate 12 is equipped with a first marking substance 70, modifiable by laser radiation, which under the action of a laser exhibits a first color transition, for example, from transparent to red. Partially metallized film 18 is equipped with a second laser-marking material 72, which is modified by laser radiation, which under the action of a laser exhibits a second color transition, for example, from transparent to green.

In this case, by applying a laser beam, create a marking 20 "PL" with three visually distinct areas. In areas of the paper substrate 12 with the first marking substance 70, a red sign 74 is formed upon laser exposure. In areas of the film 16 without a metal coating, equipped with a second marking substance 72, a green sign 76 is formed under laser irradiation, and in the metallized areas 18 of the film 16 as a result of laser radiation, a negative sign 78 is created, through which you can see the white paper substrate located underneath 12. Since all three sections are created at the same stage using the same laser beam, they are precisely aligned relative to each other, even though the marking 20 may deviate register relative to the edge of the film 16 and the edge of the metal layer 18.

In this case, the first marking substance is applied, for example, by printing, to the paper substrate 12 or it is introduced into the volume of the paper substrate 12. The last of these operations can be carried out either in the paper manufacturing process by adding the marking substance to the paper pulp when forming sheets, or later when immersed in bath, or in the process of impregnation in a size press. In addition, you can use other methods of coating, for example, the application of a substance having specific properties by watering or smearing.

The second marking agent provided in the film 16 can be applied to the film layer, for example, by printing. In addition, the marking agent can be added to the applied layer, for example to a layer of UV varnish, to a layer located below the film, or to an adhesive layer. Thus, it is possible, in particular, to create multilevel effects and complementary colors. In other embodiments of the present invention, the second marking substance is introduced in the manufacture of the film, for example during the extrusion process. In this case, the pigments printed or introduced into the deposited layers also allow the creation of multilevel effects and complementary colors.

In addition, when printing on paper or a layer of UV varnish, you can create print patterns, such as a striped raster.

Obviously, instead of, as disclosed in the description of FIG. 3, applying a marking substance to a metallized film, it can be placed under the metal layer. As shown in the cross-sectional view shown in Fig. 7a, a marking layer 90 is applied to the paper substrate 12, containing a pigment substantially transparent in the visible region of the spectrum and fluorescent under ultraviolet light, whereby the fluorescence properties of said pigment under laser irradiation are lost. In the overlap region, a film 16 containing a metal layer 18 is applied to the marking layer 90. Laser radiation 34 is applied to the multilayer material, and by controlling the laser beam accordingly, a marking 20 of the desired shape is created.

As a result of laser irradiation, the fluorescent properties of the fluorescent pigment 90 outside the overlapping region are lost, resulting in the formation of signs 22 with a changed fluorescence color. On the contrary, in the overlapping region, the energy of the laser beam is spent on the evaporation of the metal layer 18, therefore, the fluorescent properties of the marking layer 90 in the region of the negative signs 24 do not disappear. On fig.7b shows the proposed multilayer material after laser exposure.

On figs shows the appearance of the proposed multilayer material when observed under normal conditions, that is, when observing in natural daylight or artificial light. Under these conditions, only negative signs 24 can be seen within the metal layer 18. At the same time, the local disappearance of the fluorescent properties of pigment 90 in the region of sign 22 remains invisible. 7c, the indicated local disappearance is schematically indicated by the dashed line of sign 22.

When examining the multilayer material in ultraviolet light, as shown in Fig.7d, the marking 20, formed by the signs 22 and 24, is fully manifested. Fluorescent pigment 90, when excited by ultraviolet light, glows with a characteristic fluorescence color. Moreover, fluorescence is absent outside the overlapping region, in the region of signs 22, since at this point the fluorescence properties of pigment 90 disappeared as a result of laser irradiation. Thus, the signs 22 against the light fluorescence background look dark. The metal layer 18 in the ultraviolet light also looks dark, with the exception of signs 24, from which the metal layer was removed, but the pigment 90 is not destroyed. As a result, fluorescence can also be observed in the region of signs 24. In addition, in the considered embodiment of the present invention, simultaneously created signs 22, 24 also complement each other, forming a solid marking 20, without gaps and displacements, and the full marking, in contrast to the above options can only be seen when viewed in ultraviolet light.

Using several pigments, you can provide additional visual effects. In accordance with the embodiment of the invention shown in Fig. 8, a layer with a pigment 92 changing its color is applied over a layer with a fluorescent pigment 90 and a metallized film 16, 18, and under the influence of laser radiation it changes its color, for example, from transparent to red .

In this embodiment, when observing the multilayer material under ordinary conditions, it will look like that shown in Fig. 8a, and in this case, marking 20 is formed by a negative sign 24 made in the metal layer 18 and a red sign 22 made in the pigment layer 92, changing its color.

As shown in Fig. 8b, when observing the multilayer material in ultraviolet light, the marking 20 formed by the signs 22 and 24 can also be clearly seen, but in this case its appearance will be different. In the region of signs 22, fluorescence is absent, since along with the color change of pigment 92, the fluorescence properties of pigment 90 disappeared. On the contrary, fluorescence can be observed outside the signs 22 and the metal layer 18, so the signs 22 look against the light fluorescence background dark. The metal coating 18 in the ultraviolet light also looks dark, with the exception of signs 24, from which the metal layer and the layer located above it with pigment 92, which changes color, and fluorescent pigment 90 were not destroyed, were removed, as a result, you can also observe in these places fluorescent glow.

Figure 9 shows another embodiment of the present invention, in accordance with which use two layers of fluorescent pigments located one on top of the other. In this case, two transparent pigments 90, 94 are used, which fluoresce under ultraviolet light in different colors, and the laser beam energy is chosen so that only the fluorescence properties of the upper layer with pigment 90 disappear in the region of sign 22.

In this case, when observing the multilayer material under ordinary conditions, it will look like that shown in figa, and its appearance coincides with the appearance of the multilayer material depicted in fig.7c. As shown in FIG. 9b, in ultraviolet light, the metal layer 18 appears dark. Since the fluorescence properties of the upper pigment 90 are erased by laser irradiation in the region of sign 22, when observed in ultraviolet light, only the fluorescence color of the intact lower pigment 94 appears. In other areas, that is, in the region of sign 24 and the region located outside the metal layer 18 and signs 22, both pigment 90 and 94 are not damaged, so in the indicated areas you can observe the mixed color of the two colors of fluorescence.

In particular, the multilayer structures described above can be used in conjunction with the additional visual effects disclosed in German patent application DE 10 2008 019 092.6, the description of which is incorporated into this application. In short, these additional visual effects are made as follows:

B1) a multilayer material is formed, formed by at least one paper substrate containing in the marked region a laser-modified marking substance, as well as a protective element provided in the marked region, which becomes thinner under the influence of laser radiation, and

L1) they act on the multilayer material with laser radiation in order to create thin lines in the protective element at the same time and with accurate registering, and signs in the paper substrate by modifying the marking substance,

or

B2) to produce a multilayer material formed by at least one paper substrate containing in the marked region a laser-modifiable first marking substance, and also a film element containing in the marked region a second laser-modified marking substance other than the first, and

L2) they act on the multilayer material by laser radiation in order to create signs in the paper substrate and in the film element by modifying the marking substances at the same time and with the exact register.

In particular, the effects described in this application can also be used in conjunction with the visually recognizable characters disclosed in WO 2006/079489 A1, a description of which known solution is included in the present application. In short, in accordance with a technical solution known from WO 2006/079489 A1, visually recognizable characters in the form of patterns, letters, numbers or images are made as follows:

a) make a multilayer material containing a paper substrate, a first section with a relief structure and a second section,

b) a mask layer is applied to a first region with a relief structure and a second region, the regions containing the mask layer react differently to the laser radiation of the selected laser source, and

c) the first and second sections are subjected to laser radiation of the selected laser source in order to create negative signs in at least one of the two indicated areas.

In this case, the part of the paper substrate in which negative signs are formed as a result of laser irradiation may contain a laser-modified marking substance of the type described above. Thus, under laser irradiation, negative signs are formed on the masking layer section, and signs with a changed color are formed on the paper substrate below, and these signs are created at the same time with the exact register.

In this case, the first section of the masking layer, in particular, is made in the form of a relief structure with a lattice image specified by the first lattice constant and the first orientation of the lattice lines, and the second section is preferably made in the form of a relief structure with a lattice image defined by the second lattice constant and the second orientation of the lines lattice. Moreover, the second lattice constant and / or second orientation are different from the first lattice constant and / or first orientation. Additional features of possible versions of these sections, process control features and the underlying principle of interaction of varying intensities are given in the above publication WO 2006/079489 A1, incorporated herein by reference.

In accordance with another embodiment of the present invention, rasterized demetallization allows overlapping of negative signs and signs with a changed color, in which the holographic structure of the metal layer remains visible. In this case (Fig. 10a), a multilayer material 100 containing a paper substrate 12, a marking layer 32, and a metal layer 102 with a holographic structure 104 are exposed to laser radiation, whereby by appropriately controlling the laser beam, a rasterized sign 20 of the desired shape is obtained.

In particular, as shown in figa, the raster is made in the form of thin strips, however, you can choose any other shape of the raster. In order to better distinguish the stripes, they are depicted in FIG. 10a on an enlarged scale. At the same time, in practice, one should choose such a thin raster so that the bands can be distinguished without optical aids, but with difficulty.

In the region of the metal layer 102, negative signs 24 and congruent color signs 22 are formed simultaneously with the laser beam in the paper substrate 12. In the paper substrate outside the metal layer 102, the color signs 22 continue without register deflection relative to the color demetallized signs 22, 24 of the metal layer 102.

The way this marking 20 visually looks when viewed in reflected light and transmitted light is shown in FIGS. 10b and 10c, respectively. At the same time, such a thin raster is chosen that it is impossible to recognize with the naked eye the separation of the marking 20 into raster strips. Thus, as shown in FIG. 10b, when viewing the multilayer material in reflected light, due to the raster, both the design of the color sign 22 and the hologram 104 of the metal layer 102 can be seen. On the contrary, as shown in FIG. 10c, when viewed in transmitted light, recognize only the color sign design 22.

According to another embodiment of the present invention, a marking as shown in FIG. 11 is created directly on the film. For this, the film 80 in the area of metallization in the metal layer 82 contains recesses in the form of patterns, characters or code. In addition, in the marked region that overlaps the metallization region, the film contains laser-modified marking agent 84, for example, the marking agent is printed. In this case, the marking substance when exposed to a laser exhibits the desired color transition, for example, from transparent to green.

Then, the film 80 in the marked area is exposed to laser radiation in order to simultaneously create negative signs 88 in the metal layer 82 and colored signs, in this example green signs 86, in areas of the film 80 without a metal layer, with accurate register observance. Since the signs 86, 88 are created at the same stage using the same laser beam, they are precisely aligned with each other and complement each other, forming the desired marking, even though the indicated marking may have register deviations with respect to the edges of the film 80 and relative to the recesses 82 of the metal layer 80.

The colored signs 86 and negative signs 88 preferably complement each other, forming general information, for example an inscription. The content of the specified general information is preferably related in meaning to the information content of the recesses made in the metal layer. The appearance of the film containing the marking corresponds to the variant shown in fig.4b, and the colored signs 86 cannot protrude beyond the edge of the film 80. Then, the finished metallized and marked film is transferred to the main substrate, for example, it is glued over the opening of the banknote 10, as shown in figure 1.

Claims (25)

1. A method of manufacturing a secure or valuable document, characterized in that it includes the following steps:
C) a multilayer material is prepared comprising a paper substrate, a mask layer provided on the paper substrate in the masking region, and a laser-modified marking agent provided in the markable region, the markable region overlapping the mask region, and
L) the multilayer material in the marked area is subjected to laser irradiation in order to simultaneously create negative signs in the masking layer and signs with a changed color in the unmasked areas of the marked area, in which, before performing L), at least at the masking layer in the marked area, recesses are made in the form of patterns, characters or code. 2. The method according to claim 1, characterized in that in step L) create signs with a changed color and negative signs that complement each other, forming general information. 3. The method according to claim 1, characterized in that in step B) the paper substrate and the mask layer are coated with a marking agent. 4. The method according to claim 1, characterized in that before applying a marking substance to the paper substrate, some of its sections are covered with a first layer, which allows laser exposure to provide a change in the color effect of the marked area. 5. The method according to claim 4, characterized in that the first layer also contains one laser-modified marking substance, which allows laser signs in step L) to create signs with a changed color in areas covered with the first layer, providing a different color effect on unmasked areas of the marked area. 6. The method according to claim 1, characterized in that in step B) the marking substance is introduced into the volume of the paper substrate, in particular, the marking substance is added to the paper pulp when forming sheets, the marking substance is introduced into the paper substrate when immersed in a bath, or paper the substrate is impregnated with a marking agent in a size press. 7. The method according to claim 1, characterized in that in step L) create negative signs, the information content of which is connected in meaning with the information content of the recesses made in the masking layer. 8. The method according to claim 1, characterized in that in step B) a masking layer is applied to the film layer and together with the specified film layer is applied to a paper substrate. 9. The method according to claim 8, characterized in that the film layer also contains one laser modifiable marking substance, which additionally allows, in step L), to create simultaneously with accurate register marks with different color effects on unmasked areas of the film layer. 10. The method according to claim 9, characterized in that in step L) create signs with a changed color on unmasked areas of the paper substrate, signs with a changed color on unmasked areas of the film layer and negative signs, and these signs complement each other, forming general information . 11. The method according to claim 8, characterized in that the film layer is coated with a marking substance or the marking substance is introduced into the volume of the specified film layer. 12. A method of manufacturing a protective element, characterized in that it includes the following steps:
C) a film layer is made that in the masking area contains a masking layer with recesses in the form of patterns, characters or a code, and in the marked area that overlaps the masking area, a laser-modified marking substance, and L) the film layer in the marked area is subjected to laser exposure in order to simultaneously create negative signs in the masking layer and signs with a changed color in unmasked areas of the film layer simultaneously with accurate register registration. 13. The method according to p. 12, characterized in that at stage L) create signs with a changed color and negative signs that complement each other, forming general information. 14. The method according to p. 12, characterized in that at step L) create negative signs and / or signs with a changed color, the information content of which is connected in meaning with the information content of the recesses made in the masking layer. 15. The method according to any one of claims 1 to 12, characterized in that in step B), a metal layer, a layer that changes color depending on the viewing angle, or a color printed layer is used as the masking layer. 16. The method according to any one of claims 1 to 12, characterized in that in step L) rasterized negative signs are made. 17. The method according to any one of claims 1 to 12, characterized in that the characters with the changed color in step L) are created with a color that changes when observed under normal conditions. 18. The method according to any one of claims 1 to 12, characterized in that the signs with the changed color in step L) are created with the luminescence color, which manifests itself when illuminated by exciting radiation. 19. The method according to any one of claims 1 to 12, characterized in that in step L) a laser is used that emits in the infrared region of the spectrum, in particular a carbon dioxide laser with a wavelength of about 10.6 μm. 20. A protected or valuable document made in accordance with the method according to any one of claims 1-12, 16-19 and containing a multilayer material containing at least one paper substrate, a masking layer provided on a paper substrate in the masking area, modified by a laser radiation, the marking substance provided in the marked area, and when laser exposure in the masking layer, negative signs are formed, and on non-masked areas of the marked area - signs with a changed color Signs are made to exact register control. 21. A protected or valuable document according to claim 20, characterized in that the signs with the changed color and the negative signs complement each other, forming general information. 22. A security element made in accordance with the method according to any one of claims 13-19 and containing a film layer, which in the masking area contains a masking layer with recesses in the form of patterns, characters or a code, and in the marked area overlapping the masking area, contains laser-modified marking substance, moreover, when laser exposure in the masking layer, negative signs are formed, and in non-masked areas of the film layer are signs with a changed color, while these signs are made with exact observance revodki. 23. The security element according to claim 22, characterized in that the signs with the changed color made on the areas of the film layer without a metal coating and the negative signs made in the masking layer complement each other, forming general information. 24. The security element according to item 22, wherein the information content of the negative signs and / or signs with a changed color is connected in meaning with the information content of the recesses made in the masking layer. 25. The security element according to claim 22, wherein the security element is a security thread, a protective tape, a protective film, a patch, a sticker or other transfer element for applying onto security paper, a valuable document or other similar documents.

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