Data carrier with printed protective element and method for its manufacturing by metallographic printing method

FIELD: data carriers.

SUBSTANCE: data carrier 14 with forgery-protecting imprint 1 made by metallographic printing method consists of several contrasting structural elements 2,3,4,5,7,22, positioned with precise alignment to each other, while one portion of these structural elements 3,4,5,7 is made relief-type and can be sensed by touch, and other portion of structural element 2, 22 is made flat and undetectable by touch.

EFFECT: exceptionally high level of protection.

4 cl, 9 dwg

 

The present invention relates to a data carrier with anti-counterfeit stamp, as well as printed form to obtain such a copy.

For the production of high quality printed products, such as banknotes, shares, etc, in order to protect against counterfeits are often used method of metallographic printing, since the production of printing forms for obtaining reprints of this method is extremely time-consuming and expensive process, and this method allows you to get possessing the characteristic properties of the printed image (impression), which is impossible to simulate using other printing methods.

Obtained by the method of metallographic printing images with a smooth, relatively flat or smooth surface is formed very close to each other engraved lines, with separate engraved lines have a width of several tenths of a millimeter and are separated from each other naprawianie partitions.

To transfer the image from the printing plate to the substrate is etched in this printed form, line, fill in the printing process, paint. Excess paint is removed from the printing plate by using the erase roller or squeegee so that the paint was filled only with engraved lines. As a result of such wipe excess paint from the surface of the printed fo what we are removed thus all components of the paint.

After that, the printing process the printing medium, usually paper, is pressed under high pressure to the printed form of the pressure cylinder with an elastic surface. When this medium is pressed into the filled paint the engraved lines of the printing form and thus comes into contact with the printing ink. When the separation of the media from the printing form remains the printing ink captured them from the recesses formed by engraved lines. In the thus obtained printing has printed lines, the ink layer thickness which varies according to the depth of the engraved line.

Use for metallographic printing translucent printing inks allows you to get on white media when sealing colorful layers of small thickness bright color tint, and with the sealing of thick paint layer is darker hue. Compared with other common printing methods of metallographic printing allows you to get prints with colorful layers of very great thickness. If there are more deep engraving obtained by this method prints become even discernible to the touch. The use of smaller engraving allows you to get extremely thin and clear print l the Institute.

In the application WO 97/48555 describes how mechanized the production of printing forms, allowing the playback quality to produce printing plates for metallographic printing, and almost independently adjust the width and the depth of each of the engraving lines. To this end gather information about the dashed lines of the original and accurately determine the area occupied by each line of the surface. After this engraving tool, for example a rotating chisel or a laser beam, first engrave the outer contour of this surface with the aim to clearly limit it. Then using the same or another engraving tool with a limited way of surface area to a predetermined depth to relieve or remove the material, getting clearly engraved in accordance with the stroke original line. This method allows to obtain extremely fine engraved lines of relatively great depth, i.e. allows to obtain a line that provides the application of a large amount of ink on the media. Thereby possible to obtain prints, in which even very fine lines form a relief structure identifiable by touch.

The present invention was used to develop the media information obtained by the method of metallographic printing stamp, to ensure is that the exceptionally high degree of protection against forgery.

This task is solved by the distinguishing features of the independent claims. Preferred embodiments of the invention are provided in the respective dependent claims.

The basic idea of the invention is to obtain on the storage media print, consisting of several contrasting structural elements available with precise registration relative to each other, at least one of these structural elements is suggested to carry out relief and distinguishable to the touch, and the other part of such structural elements is proposed to perform flat and not discernible to the touch. Such structural elements are preferably to be the media for one stage in the process of metallographic printing.

In the context of the present invention under the "registration" means the exact adjunction or contact large filigree, respectively embossed and flat structural elements in the transition area, where large filigree, respectively embossed and flat patterns adjacent to each other.

The term "relief" means the excess of the level at which is located the surface of the structural element, taken over a base plane of the surface of the information carrier by an amount higher than the surrounding approximately 30 μm and preferably component from about 40 to about 100 microns. In contrast, the term "flat" or "smooth" refers to the structural element, the surface of which is ideally located at the same level as received at the reference plane surface of the storage medium, but may be slightly higher than this reference plane maximum amount of about 25 to 30 μm, preferably, but not exceeding 25 microns.

It should be noted that the height of the embossed patterns on the surface of the information medium is not identical to the depth of the engraving of the printing form. The reason is that in the process of printing medium is pressed into the engraved in printed form cavities are not to their bottom, and so filling such cavities printing ink is not fully transferred to the media. In accordance with this depth of engraving of the printing form to obtain relief of the structural elements should be approximately 40 to 200 microns, preferably from about 55 to 150 μm, and to obtain a flat structural elements is from about 5 to 50 μm, preferably about 10 to 25 microns. Will the depth of the engraving on the edge of the area to receive on the surface of the media more relief or Vice versa flatter footprint, depends in each individual case, including the steepness of the lateral surface is she engraved recesses, from the properties of the printed substrate (strength, ductility) and on the content of solids, respectively, of the solvent in printing ink.

When using translucent colors visually perceived brightness, respectively lightness hue depends on the thickness deposited on a substrate layer of paint, as well as the type, composition and concentration of the pigment. The paint layer thickness of about 2-5 microns allows to obtain bright, translucent color tone, while the prints with such thickness of the paint layer is not perceptible to the touch. When the ink layer thickness of about 5-10 μm, the color tone becomes darker, but the impression remains, as in the previous case, is not discernible to the touch. And only when the ink layer thickness of about 10-30 μm imprint, which is visually perceived as a much more dark, becomes apparent to the touch. Visually distinct contrast between the proposed invention the structural elements can therefore be created by varying the thickness of the paint layer. Because tactile perception is a subjective feeling, a value from which a relief structure is amenable tactile perception, can only be determined roughly. The possibility of tactile perception relief structure of the stamp in addition to the absolute heights this is the first relief structure and individual sensitivity depends in addition, from their printed structure square and is located does touch the printed structure is isolated or integrated into surrounding printed image.

In addition to the above degree of protection against forgery, provide proposed in the invention, the protective element, respectively, a protective seal can further increase due to more frequent changes of diverse structural elements. While structural elements vary in area they occupy and/or vary their light/dark contrast and/or tactile properties. Exact registration between the various structural elements and receipt of protecting against tampering of the impression that creates associated with such accurate wiring special optical impression can only be achieved by a method of metallographic printing, i.e. when using the printed forms, which protects against forgery image engraved in full compliance with the desired registration between the individual generators of its structural elements.

Structural elements can optionally be combined with the negative elements. Under "negative element" means not covered with printed paint section of any shape, surrounded by covered with printing ink area. Such negative elements can be placed in pre is Elah structural element in the form of educated not sealed surface graphic or alphanumeric information, for example in the form of a logo, nominal exchange or stroke, and in this case, the structural element is not completely covered with printing ink. In another embodiment, these negative elements can be performed as the dividing line between separate structural elements. In this case, the negative elements preferably have the form of a complex line drawings of figures or patterns, for example in the form of gelosa.

Because of metallographic printing allows you to get a print with sharp contours, there is a possibility to get a visually distinct negative signs with a very small line width of up to 10 μm. Such additional information, simply put offer in the invention is a method of etching in the manufacture of printed forms. At the same time for potential counterfeiters reproduction of such information poses an additional difficulty.

In accordance with one of the preferred options one part of the structural elements is proposed to run large, and the other part thereof is proposed to perform filigree.

Under the term "major" refers to the structural elements of the large square, which received the printing raster form, and actually consist of flat elements of a certain width, greater than about mm.

In contrast, the term "filigree" refers to the structural elements are formed by thin lines under certain conditions overlap and are intertwined, such as gelosi. The width of the lines such delicate structures is not more than 1 mm, preferably not more than 0.5 mm.

According to another preferred variant of the structural elements are encouraged to pick up and position with respect to the register relative to each other so that the impression was attended by at least two reproducing some visually distinct image information, preferably superimposed on each other. For example, the first reproducing some of the information image can be formed relief and distinguishable to the touch structural elements, and the second reproducing some of the information image may comprise at least for the most part, flat and not discernible to the touch of the structural elements.

If one part of the structural elements is additionally made the filigree, and the other part thereof is made large, reproducing some of the information image can be linked, for example, as follows. All filigree structural elements and part of the major structural elements of the proposed in izobreteniya item carry out relief and distinguishable to the touch and forming a first reproducing some visually distinct information image. Some of these distinguishable to the touch of the structural elements at the same time belongs to the second reproducing some of the information image, which in addition to distinguishable to the touch contains also flat, not discernible to the touch structural elements. Preferably, the flat structural elements of the second reproducing some information of the image occupied a large area and thus visual perception of the second reproducing some information image was determined primarily flat structural elements. Thus distinguishable to the touch structural elements form with respect to the second reproducing some of the information image is just a sort of imposed on him, preferably darker figure. The rest of the structural elements relating to the first reproducing some of the information image, which preferably consists only of filigree structural elements adjacent the compliance register to the second reproducing some of the information image. According to a special variant of such filigree structural elements form a continuation of the contour lines embossed elements common to both images, each of which plays a specific information.

The above protection is the first element according to another preferred variant may contain negative elements. So, for example, structural elements of the first and second reproducing some information images can be separated by a thin contour line, left unsealed. In this case, the structural elements that are specific to the first reproducing some of the information image may form a continuation of and this is left unsealed contour lines.

Printing form, which create proposed in the invention, the imprint has a corresponding structural elements in the form of recesses, with such structural elements in this case are with precise registration relative to each other. The depth of the engraving grooves, forming a separate structural elements, when this is chosen in such a way that one part of these structural elements was after printing, relief and distinguishable to the touch, and deeper, forming another part of the structural elements, engrave on small depth so that after printing, these structural elements were flat and not discernible to the touch. The depth to which engrave the first part of the structural elements, is preferably from about 40 to 200 μm, more preferably from about 55 to 150 μm, and the depth to which engrave the second part of the structural elements, preferably approximately from 5 is about 50 μm, more preferably from 15 to 40 microns.

Since, as mentioned above, the height of the resulting relief printing patterns depends not only on the depth of the engraving of the printing form, but also on the properties of the substrate and printing inks, in special cases, the engraving depth of 40 μm can already result in a relief print, while other parameters of the material and paint even when the depth of etching in 50 μm imprint may be flat. However, under all conditions, the depth of the engraved recesses leading to the relief areas of the imprint is always greater than the depth of the engraved recesses intended to receive the so-called flat, not discernible to the touch areas of the impression.

According to another preferred variant of the invention, the structural elements are supposed to be performed so that the area in which both reproducing various information image superimposed one on the other, remained unsealed or was of such intensity, which clearly differs from relief and distinguishable to the touch of the structural elements and flat and not discernible to the touch of the structural elements. When this relief and the flat structural elements, as well as unsealed, respectively contrasting CEE the new tone of the plot overlay one reproducing some information image to another and in this case are placed with precise registration relative to each other.

Other options for the implementation and advantages of the invention discussed below in more detail with reference to the accompanying drawings. In this regard it should be noted that shown in these drawings images are illustrative and executed schematically, thus primarily neither the width nor the ratio between the thickness of the various layers do not correspond to true scale. Attached to the description of the drawings in particular, it is shown:

figure 1 is a first embodiment of the proposed invention in the protective element,

figure 2 is a second embodiment of the proposed invention in the protective element,

figure 3 is a fragment proposed in the invention of the printing form,

figure 4 - slice cutaway media after sealing using is shown in figure 3 of the printing form,

on figa - enlarged image is indicated in figure 2 by the letter a fragment of the protective element,

on fehb and 5B is similar figa image of the same slice And after attempts to forge prints

figure 6 and 7 the other two scenarios proposed in the invention, the protective element.

Figure 1 shows the first embodiment of the proposed invention in the protection element 1. This protective element 1 consists of a set of structural elements with t who offered the register in relation to each other. One of these structural elements shown in the drawing in black, made relief and distinguishable to the touch, and the other part of the structural elements shown in gray, made of flat or smooth and not discernible to the touch. All such structural elements are performed in a single operation method of metallographic printing on any substrate. In this example, the individual structural elements are located relative to each other so that they form information in the form of two visually distinct images. While such images are the number "2000", overlaid with the inscription "Banknote" ("Bill").

For a more visual explanation forms the basis of the present invention principle below proposed in the invention, the solution is described on the example of the structural elements relating to the number "2" and the letter "b". The remaining sections deposited on a substrate of information have a similar structure.

The number "2" is composed of large, flat and distinguishable to the touch of the structural elements 2, also large, but the relief and distinguishable to the touch of the structural elements 3, as well as from filigree and embossed identifiable by touch of the structural elements 4, 7. While the structural elements 4 form a contour line, limiting the number "2". All structural elements and first of all structurn the e elements 4 and 7, as well as the structural elements 3 and 4 are placed according to the invention with respect to the register with respect to each other. In addition, various structural elements such as structural elements 2, 4, or 2, 3, immediately adjacent to each other.

Structural elements 3, 7 are fragments of the reproduced second image information, and together with filigree, relief and distinguishable to the touch structural elements 5 form the letter "B". Structural elements 5 are made in this case in the form of filigree lines located with respect to the register with respect to the structural elements 3 and 7. Between these lines 5 are unsealed surface 6.

Figure 2 shows another embodiment of the proposed invention in the protection element 1. Shown in this drawing information is also formed by two images superimposed on each other. In this case, the reproduced first image information, namely the number "2000", also consists of flat, not discernible to the touch of the structural elements 2, filigree, relief and distinguishable to the touch of the structural elements 7, as well as large and distinguishable to the touch of the structural elements 3. Similarly, shown in figure 1 variant flat, not discernible to the touch structural elements are depicted in gray, and relief, the different is presented on the touch structural elements are depicted in black.

Unlike shown in figure 1 option in this case there is no filigree embossed contour line 4. Therefore, in figure 2 the relief and distinguishable to the touch structural elements are a component of the reproduced second image information. Beyond the area of the overlap of both images visible, distinguishable by touch of the structural elements 3 and 7 are supplemented by other relief filigree structural elements 5. Played the second image information, in this case, a stylized image of the eagle becomes a finished look and is visually distinguishable only in the presence of all of the structural elements 3, 5, 7.

The protective element 1 shown in figures 1 and 2, is created in a single operation printing. For this purpose it is preferable to use semi-transparent printing ink, making the flat structural elements 2 are visually perceived as having a lighter color tone, and structural relief 3, 4,5,7 - as having a darker hue. Such differences in colors are due to different thickness of paint layers. In accordance with that used for printing the printing form to be engraved on the respective plots at different depths.

Figure 3 shown in the cross section of the fragment proposed in the invention of the printing form. On atipichnoi form 8 have a depth relative to the surface 11 of engraved areas 9, 10. First engraved area 9 is etched to a depth a, and the second engraved area 10 is etched to a depth of b. At the level of the surface 11 of the printing form 8 both of these engraved plot 9, 10 directly adjoin one another and separated by a partition 12, which ends at the level of the surface 11 of the printing form 8 sharpened top edge 13. In another embodiment, the printing plate 8 can also be done with some not reaching the level of its surface 11, i.e. based on a few micrometers below this level, the top edge 13. Thanks to this pointed up the partition 12 adjacent to each other continuous sealed parts have sharp contours. The method of manufacture and different ways to perform such printing forms with dividing partitions is described in detail in German application P 19845436.8, which fully included in the present description by reference.

In the process of printing, engraved section 9 creates on the printed substrate, the imprint of a lighter hue than the impression created by the engraved section 10 greater depth. If you use the engraved section 9, you need to create not discernible to the touch structural elements, the depth and the etching should be from 10 to 40 μm. To obtain reprints of the light who's color tones, visually perceived as semi-transparent, the depth of etching should preferably be from 10 to 25 μm. Relief, discernible to the touch structural elements can be created, for example, by using the engraved section 10. In this case, the depth b of his engraving should be from 40 to 200 microns.

Figure 4 in section schematically shows a portion of the substrate 14, such as paper, obtained with the method of metallographic printing using is shown in figure 3 of the printing form 8 imprint. In the printing process, the substrate 14 is pressed into the engraved areas 9, 10, resulting from the lower side 15 of the substrate 14 can be corresponding indentations 16, 17 depending on the pressure applied to the substrate during printing. On the upper side 18 of the substrate 14 opposite to those places, which, on its lower side are formed recesses 16, 17 are formed corresponding to the protrusions. These ledges are covered with colorful layers 19, 20, moved in the process of printing from engraved sections 9, 10 on the upper side 18 of the substrate. X-height, relief print is determined as the difference between the level of the unsealed upper side of the substrate and the height of the surfaces of the respective painted areas (dice) 19, 20. In a transitional area between the painted areas 19, Caldina their colorful layers x, we gradually decreases until the separating boundary line defined by the top edge 13 of the dividing walls 12 of the printing form 8. Depending on the implementation of this partition walls 12 are formed more or less wide edge area, providing a clear distinction between the sealed areas of different color tones.

On figa in an enlarged scale is shown marked in figure 2 by the letter a fragment, which clearly shows that the individual structural elements are located with precise registration relative to each other. Thus, in particular, the structural elements 7 accurately adjacent to the structural elements 2. With precise registration relative to them are structural elements 5. These structural elements with respect to the register adjacent to the structural elements 2 and as if to pass directly to a contour line of the structural elements 7.

So the exact locations of some of the structural elements relative to the other is impossible to achieve using conventional printed forms and conventional printing methods. The reason is that when using conventional printed forms to get shown on the drawings images would require at least two stages of printing, the first of which is printed, for example, structural elements 2, respectively, the first detail is rmacy, for example, the number "2000", and the second stage on top of the first information is printed the second information, for example an image of an eagle, shown in figure 2. However, such attempts to forge a printed image is easy enough to recognize, as ordinary printing methods do not allow to achieve the required register.

On fehb and 5B shows the boundary areas between different structural elements obtained in a similar attempt to forge a printed image. For example, figb structural elements 2 are outside of the structural elements 7, and therefore of the limited structural elements 5 surface 6 is also filled with paint. In the shown figv example, the structural elements 7 end outside of the structural elements 2. As such offset some of the structural elements relative to the other substantially distort or impair the overall appearance of the printed image, attempts to forge proposed in the invention, the protective element immediately become visible.

Another embodiment of the proposed invention in the protective element shown in Fig.6 and 7. The first information is the letter "B", the image of which is shown in black areas formed relief identifiable by touch of the structural elements 3, 7. The second information in the present embodiment, logic digit "2", the image which is obtained mainly by a large, flat and not discernible to the touch of the structural elements 2, as shown in the drawing in grey. Section 21 of the surface on which both reproducing the information image superimposed on one another, shown in figure 6 variant is not sealed, but is surrounded by a sealed parcels and therefore visually readable throughout its length. This is achieved primarily due to the fact that the relief angles of the structural elements 3 and the flat structural elements 2 adjacent with accurate wiring to one another, which cannot be achieved using conventional printing methods.

Shown in Fig.7. variation of land surface 22, on which both the sign "In" and "2" are mutually overlapped, sealed. However, unlike shown in figures 1 and 2 options in this case, this plot 22 overlap one character to another is made so that its contrast, respectively, the intensity, clearly different from the directly adjoining the relief of the structural elements 3 and the flat structural elements 2. 7 this plot 22 overlap of the two characters is lighter educated relief structural elements 3, 7 sections and formed of flat structural elements 2 plot stamp. In other words, h is section 22 of the paint layer has the smallest thickness, and therefore, the surface on this part 22 is flat and not discernible to the touch. However, there is also the possibility for the account of the respective engraving of the printing form, apply to this section 22 to overlap the two characters colorful layer of such thickness that it looks darker compared to the adjacent flat structural elements 2 forming the number "2", but lighter in comparison with discernible to the touch structural elements 3, 7, forming the letter "B". The accuracy of registration between the individual structural elements can be controlled primarily at corners and edges, they are adjacent to each other.

Proposed in the invention, the protective element can be the do you print on substrates of any type. It is mainly used on paper carriers. However, such a protective element may be applied on the film substrate. In principle, such a protective element can be used in all cases where the protection of various products from fakes high demands, such as securities, Bank notes, identity cards, passports, and various kinds of evidence or on expensive tickets.

1. Medium (14) with anti-counterfeit stamp (1)obtained by the method of metallographic printing is composed of several contrasting structural elements (2, 3, 4, 5, 7, 22), located with precise registration relative to each other, with one of these structural elements (3, 4, 5, 7) is made relief and distinguishable to the touch, and the other part of such structural elements (2, 22) is made flat and indistinguishable to the touch.

2. The carrier (14) according to claim 1, characterized in that the relief and distinguishable to the touch structural elements (3, 4, 5, 7) have a darker color tone compared to the flat and indistinguishable to the touch structural elements (2, 22).

3. The carrier (14) according to claim 1 or 2, characterized in that one part of the structural elements (2, 3) is made large, and the other part of the structural elements (4, 5, 7) is made of filigree.

4. The carrier (14) according to any one of claims 1 to 3, characterized in that the part of the filigree structural elements (4, 5, 7) is made relief and discernible to the touch.

5. The carrier (14) according to any one of claims 1 to 4, characterized in that the part of the major structural items (3) relief and made distinguishable to the touch.

6. The carrier (14) according to any one of claims 1 to 5, characterized in that the protecting against tampering of the seal (1) contains several reproducing some information mutually contrasting images, which are separated one from the other light/dark contrast and/or large filigree structural elements(2, 3, 4, 5, 7, 22) and is the quiet, at least in some areas are distinguishable by touch relief structure.

7. The carrier (14) according to any one of claims 1 to 6, characterized in that the protecting against tampering of the seal (1) contains at least two reproducing some information visually distinct images, which are preferably superimposed on each other.

8. The carrier (14) according to any one of claims 1 to 7, characterized in that the protecting against tampering of the seal (1) contains the first reproducing some of the information image, which at least partially consists of a relief, distinguishable by touch of the structural elements(3, 5, 7).

9. The carrier (14) according to any one of claims 1 to 8, characterized in that the protecting against tampering of the seal (1) contains the second reproducing some of the information image, which at least consists mainly of flat, indistinguishable to the touch of the structural elements (2, 22).

10. The carrier (14) according to claim 9, characterized in that the flat structural elements (2) are limited filigree, discernible to the touch structural elements (4).

11. The carrier (14) according to any one of claims 1 to 10, characterized in that the relief part of the structural elements (3, 7) of the first reproducing some of the information image is also a fragment of a second reproducing some information of the image.

12. The carrier (14) according to any one of claims 1 to 11, characterized in that mo is preferably filigree structural elements (5) of the first reproducing some of the information image, not a fragment of a second reproducing some of the information image are accurate registration with respect to the structural elements (2, 4) second reproducing some information of the image.

13. The carrier (14) according to any one of claims 1 to 12, characterized in that the structural elements are separated from one another narrow unsealed contour line.

14. The carrier (14) according to any one of claims 1 to 13, characterized in that the structural elements contain negative elements in the form of alphanumeric characters and/or graphics.

15. The carrier (14) according to any one of claims 1 to 14, characterized in that the filigree structural elements (4, 5, 7) represent a line width less than 1 mm, preferably less than 0.5 mm.

16. The carrier (14) according to any one of claims 1 to 15, characterized in that the line width of the major structural elements (2, 3) is more than 1 mm.

17. The carrier (14) according to any one of claims 1 to 16, characterized in that the reproducing some information contrasting images are reproducing alphanumeric and/or graphic information of the image.

18. The carrier (14) according to claim 7, characterized in that the intensity at the site (21, 22), which reproduces some of the information image superimposed one on another, visually ex which differs from the intensity of tone embossed and flat structural elements (3, 7, 2) outside of this area of the overlapping images.

19. The carrier (14) according to claim 7 or 18, characterized in that the section (21), which reproduces some of the information image superimposed on one another, not sealed when metallographic printing.

20. The carrier (14) according to any one of claims 1 to 19, characterized in that it is a valuable paper, preferably paper.

21. Printed form (8), preferably a printed form for metallographic printing, designed to get protecting against tampering of the seal (1), consisting of several contrasting structural elements(2, 3, 4, 5, 7, 22), located with precise registration relative to each other, with such structural elements(2, 3, 4, 5, 7, 22) formed by recesses (9, 10) in printed form (8), and one part of said structural elements (3, 4, 5, 7) engraved at such a great depth (b), so that after printing, these structural elements (3, 4, 5, 7) were relief and distinguishable to the touch, and another part of said structural elements (2, 22) engraved on such a small depth (a), so that after printing, these structural elements (2, 22) were flat and indistinguishable to the touch.

22. Printing form according to item 21, wherein the depth (b), on which is engraved the first part of the structural elements, ranging from 40 to mm, and the depth to which engraved the second part of the structural elements, is from 10 to 40 microns.

23. A method of manufacturing a media with anti-counterfeit stamp produced by the method of metallographic printing and consisting of several contrasting structural elements, such structural elements are placed with precise registration relative to each other and one of them carry out relief and distinguishable to the touch, and another part of them perform flat and indistinguishable to the touch.

24. A method of manufacturing a protective element, which represents a protecting against forgery impression produced by the method of metallographic printing and consisting of several contrasting structural elements, such structural elements are placed with precise registration relative to each other and one of them carry out relief and distinguishable to the touch, and another part of them perform flat and indistinguishable to the touch.



 

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Valuable document // 2241603

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