Information medium sealed up by method of metallographic printing

FIELD: information medium sealed up by the method of metallographic printing, method for its manufacture, as well as a printing plate suitable for the purpose and the method for its manufacture.

SUBSTANCE: the information medium, first of all a bank note, securities or a similar document, which has at least one sealed up section (13) and at least one separate section (14) practically completely encircled by this section. The mentioned section (13) and the separate section (14) are sealed up by the metallographic method, and both sections are sealed up by paint coats of a different thickness and differ from one another.

EFFECT: provided a high degree of protection against forgery of the information medium.

21 cl, 11 dwg

 

The present invention relates to a storage medium, sealed by the method of metallographic printing, the method of its manufacture, and suitable for this purpose, the printed form (plate-plate) and the method of its manufacture.

Counterfeit documents and valuable documents, such as banknotes, stocks, bonds, certificates, cheques and other securities, which must meet high requirements with regard to their protection against counterfeiting, most often made by the method of metallographic printing. This method of printing allows you to get a distinctive, easily recognizable to even the layman printed image (impression), which is impossible to get or mimic other common printing methods.

When metallographic printing relevant areas of the image usually reproduce by using linear screen, while the distance between the raster lines and their width is determined by the hue, respectively, the optical density (shade of gray) sealed surface area. Print line, the width of which is usually a few tenths of a millimeter, separated one from the other unsealed areas. In the printing process, paint only filled cavities, performed on the surface of the printing plate etching is or etching, while on the surface of the printing form-based paint is missing. To do this, from the surface of the printing form after applying the paint, the excess ink is removed by means of the erase roller or squeegee.

Directly in the printing process the printing medium with high pressure (the pressure) is pressed the pressure cylinder with an elastic surface to printed form. At least partially compressible base media, usually paper, is pressed into the filled paint deepening of the printing form and thereby comes into contact with the printing ink. Subsequent separation of the media from the printing form was up to this point in the recesses of the printing plate printing ink remains on the surface. Thus obtained imprint consists of spaced apart printed lines or areas (dice), which, depending on the depth of the engraving of the printing form is covered with a colored layer of different thickness.

Under high pressure the base material is additionally subjected to embossing, in which the reverse side of the media gets relief (embossed) structure. When sufficient depth engraved on the printed form depressions in the printing method of metallographic printing the basis is the La information as a result of its stamping and transfer it paints get the impression with discernible to the touch of a relief structure. Not printed not covered by the paint surface sections of the media are in the process of printing under high pressure kind of calendering, resulting in compaction and smoothing the surface of the media. The presence of such characteristics obtained by the method of metallographic printing impressions actually allows at any time to distinguish them from the impressions obtained by other methods.

The present invention was based on the task of getting through metallographic printing more complex prints with a high degree of protection against forgery.

This problem is solved by using objects presented in the independent claims. Preferred embodiments of the invention are given in the respective dependent claims.

Proposed in the invention, the media has sealed the method of metallographic printing section of the large size and at least one completely surrounded by this area a separate area of the smaller sizes, the large plot sizes and a separate area smaller sealed one and the same printed paint, but covered with a colorful layer of varying thickness, allowing them to visually contrast the e background of the other. Mark played a private area, can be any geometric shape, or any geometric element, for example, with a round, three - or four-cornered or asymmetric outline graphic symbol font symbol or any other symbol, in the case of font characters are preferred primarily alphanumeric characters.

The sealed area and surrounded them on all sides as a separate area sealed colored layer of different thickness. Because paint normally used for metallographic printing, are to some extent translucent and translucent, with a corresponding thickness of the paint layer and an appropriate background color paints you can get the color tones or shades of gray varying brightness and color saturation. When a sufficient difference in the thickness of paint layers on adjacent parcels seal these areas are mutually contrasting and clearly visible to the human eye without additional accessories. This assumes the presence of normal lighting conditions and the normal distance between the human eye and media.

The sealed area of the large size and surrounded them as a separate area of the smaller sizes are accurate wiring to one another, if they are in Aimee location relative to each other is set in advance and is maintained with high precision and reproducibility without any deviations. In the superposition of two imprints on one another or with their combination by printing in two consecutive independent from each other stage to provide such positioning of both the printed areas with accurate wiring to one another is impossible.

According to one preferred options sealed area large and private plot of the smaller sizes can be distinguished from one another not only visually due to their mutual contrast, but also to the touch. This is due to the fact that in the printing process, the surface of the information carrier in the deep embossing of the substrate material under high pressure clamp to the printed form of application on this basis the paint layer of a certain thickness acquires a relief structure. The total height or the difference in height of such relief, measured, respectively, measured relative to the normal, i.e. unsealed and non-embossed surface of the information carrier, is distinguishable by touch areas at least 25 microns. Most preferably, the bump height was not less than 40 μm, because for such values of elevation relief areas on the surface of the media is most clearly discernible to the touch.

Proposed in the invention, the media have avicennae degree of protection against forgery, as such the media due to their typical metallographic printing imprint can not be reproduced widespread methods of printing. The presence on the surface of the media discernible to the touch elements additionally provides effective protection against forgery by the colored photocopies or scan.

According to another particularly preferred variant within having large dimensions of the sealed area of the storage medium can additionally provide a separate unsealed areas, which, in turn, can take the form of any one or all of the various characters. Thus in addition to the two types of information, reproduced as a positive image, i.e. applied to the storage medium of the paint layer on the same surface of the carrier, you can play the third type of information in the form of a negative image, i.e. using unsealed areas, surrounded on all sides sealed part.

According to another variant of the sealed area of the big sizes, you can also provide multiple surrounded them separate plots of smaller sizes, while the paint layer may have either the same thickness on all such sections, or razlichayutsya on each of them. Such separate sealed parcels equally possible to envisage unsealed areas.

Separate plots of smaller sizes can be according to the invention any arbitrary shape, for example the form of a geometric pattern, pattern, logo, or alphanumeric characters.

Different parts of the smaller unsealed areas, as well as the sealed area of the big sizes can also add contours to reproduce the information with a coherent semantic content. For example, the sealed area of the big sizes can be done in the form of alphanumeric characters and the same sign to make separate plots of smaller sizes, as well as possibly available at a sealed section of large size and/or in certain areas smaller unsealed areas. If the media several sealed areas of the big sizes that work together to form some bearing meaning readable information, such as multi-digit number or a word from the individual sections of smaller and/or unsealed areas within the sealed area larger sizes can also be bearing the same semantic information. However, a similar way of private participation the Cove smaller and/or unsealed areas can also be the information, carrying any other arbitrarily defined semantic content.

Separate plots of smaller sizes can be positioned within the sealed area of the big sizes arbitrarily, with the only restriction imposed on the location of individual sites smaller the sealed area larger sizes, is that such a separate part, respectively, such individual plots should be almost completely surrounded by the sealed area of the big sizes. In the presence within the sealed area of the big sizes only one particular area of the smaller sizes it can play, for example, the same information that the sealed area of the big sizes, and take place within this sealed area large size parallel to its outer contour. However, more preferably the presence of the sealed area of the big sizes of several separate plots of smaller sizes. Obviously, the smaller the size of the individual plots, the greater number of them can be placed in a sealed area of the big sizes. These separate plots of smaller sizes can be placed in a sealed area of the big sizes in any scheme of obtaining a certain pattern or picture. Similar to the pattern may also be present with the carrier battle some semantic content readable information, or just a system of regularly recurring columns and/or rows. If the sealed area of the big sizes are additionally provided with an unsealed areas, they can be arranged in alternating order with some areas of smaller size.

The proposed invention media unsealed areas and areas covered with colorful layers of different thickness, can be directly border between them in any sequence. This makes the possibility of obtaining extremely complex prints and combine in the same part of the surface of several different types of information, reproduced including in the form of a positive image. Thereby expanding the range of clearance obtained metallographic printing impressions from the point of view of layout playing with their help information.

Proposed in the invention a method of manufacture of the sealed media has, in addition, significant economic benefits, since the surface to be printed colorful layers of different thickness, receive for one stage of printing the same print paint. Proposed in the invention method can be used to seal all suitable for metallographic printing materials such as paper, polymeric film, laminated to polymer the th film or varnished paper, as well as multi-layered composite materials.

Proposed in the invention of the printing form for metallographic printing is preferably produced by means of etching the rapidly rotating chisel with sharply angled top. However, in accordance with the contour of the printed area on the surface of the printing form by means of engraving tool perform the corresponding recesses, the depth of which is purposefully varied by changing the depth of the engraving tool in material form, and which subsequently fill for printing ink. In the printing process is the transfer of printing ink from the recesses in the printed form on the surface of the printed substrate. With raw, i.e. not engraved, surface areas of the printing form-based paint on the canvas is not tolerated. Engraved on the printed form on the depth of the recess produce sealed on the basis of the result of the embossing higher terrain with thick paint layer, while less deep engraved deepen result is obtained by embossing only a small height of the terrain with a thin paint layer. Application for printing translucent colors allows you to get a visually contrasting due to the different thickness of the paint layer sealed the haunted areas you can distinguish one from the other even when they are directly adjacent to each other.

In order to avoid blurring of contours directly bordering each other paint layers after their transfer to storage media due to overflow is not yet dried up ink from one of the sealed area to another along their boundary line in printed form between cuts at different depth areas to leave the so-called "separation wall". Such partition has a cross-sectional wedge-shaped profile with converging at an acute angle sides, i.e. with sharply angled top. Preferably, the apex of this wedge-shaped profile was at the level of or slightly below the surface of the printing form.

Sharp peak having a wedge-shaped profile dividers forms along its length almost one-dimensional line, similar to the cutting edge of the knife. Although this line and separates one from the other areas, engraved in printed form at different depths, however, it does not create the impression of an apparent gap between adjacent to each other continuous sealed dies (plots). Due to the presence in print form such a partition used for metallographic printing and having osteopathy the consistency of the printing ink after it is transferred on the basis of "saves" given her spatial form even in the case when plots sealed colored layer of different thickness, directly adjoin one another. Thus, there is a possibility to get in metallographic printing prints with exceptionally small, overlaid structures with different thickness of the paint layer and with clearly defined contours.

When the engraving of the printing form engraving tool is moved so that between adjacent areas, cuts at different depths remained partition with sharply angled top. If obtained on the basis of the print should be sealed in a separate area, completely surrounded also sealed area of the big sizes, engraved in printed form a recess corresponding to that particular area of the smaller sizes should be almost around its perimeter surrounded by a dividing partition. In the ideal case, such a recess corresponding to a separate section of smaller, shall be completely surrounded by the perimeter of the baffle.

If on the printed form or at least on her part before the printing process the printing ink is not applied, i.e. do not fill in block paint all or at least part engraved in it grooves, it is not rolled printing inks is the first section of the printing form performs only the functions of forms of stamping, allowing in the process of metallographic printing to get on the basis of the so-called blind embossing. Such received by the embossing elements have except the generated print paint a visual impression similar proportions and tactile properties as described above is sealed areas and surrounded them separate sections.

Other embodiments of the invention and its advantages are discussed below in more detail with reference to the accompanying drawings. These are considered in the subsequent description of the options relate primarily to individual areas of exceptionally small size. It is obvious, however, that sealed offer in the invention by way of lots of media, and surrounded them separate sites you can run and large sizes, i.e. from a few millimeters to several centimeters.

Attached to the description of the drawings in particular, it is shown:

figure 1 - schematic representation of the banknote in the form of the plan,

in figure 2, 3A, 3b and 4 fragments cutaway sealed media,

figure 5 is a view in plan obtained by the method of metallographic printing imprint with two superimposed one on the other types of information

figure 6 is a view in plan of another obtained by the method of metallographic printing imprint with three superimposed the one on the other types of information

on figa, 7b and 8 is a view in plan obtained by the method of metallographic printing stamp with different superimposed on each other types of information and sites, sealed colored layer of different thickness, and

figure 9 is a view in plan of another obtained by the method of metallographic printing stamp with different superimposed on each other types of information, presented in the form of a positive image.

Figure 1 as an example of the information storage device 1 schematically shows a banknote. Usually on the banknote are reprints of various types. As shown in the drawing banknote, for example, a printed image 5 in the form of a portrait. Such printed image 5 get the usual method of metallographic printing, i.e. to play various color tones, respectively, for varying the brightness using a linear grid with variable spacing between raster lines or varying width of raster lines. In addition, bill has received offset printing method, a background pattern 7 of fine lines and applied by the method of letterpress printing serial number 8.

In the form shown in the drawing, the example proposed in the invention, the print is only on one selected area of the surface of the banknote and consists of a fully sealed paint phase 2, which is completely the neighborhood is a separate plot 3, also sealed solid paint layer. These areas 2 and 3 are sealed by the method of metallographic printing colorful layers of varying thickness, allowing visually these parts are one in the background of another due to the presence between site 2 and a separate 3 phase brightness, respectively, of the color contrast. In addition, within the sealed area there are 2 separate unsealed sections 4, which give them the right contour is allowed to reproduce other information.

In contrast, according to the prior art for reproducing various kinds of information use only fully sealed areas on unsealed background, i.e. a positive image or unsealed areas in a sealed background. Figure 2 shown in the cross section of the part sealed in accordance with the prior art device in which the base 9 is sealed at spaced apart sites of 10 printed paint. In a positive image of the actual information is transmitted through sealed sections 10, which due to the high contrast with the surrounding unsealed sections 11 and 12 show up on their background. In the reversible image information is reproduced by using unsealed sections 11 of the surface, while the sealed sections of the form 10 fo contour is, surrounding reproducing information unsealed areas 11. Painted sections 10 when receiving the usual method of metallographic printing represents a line whose width is much smaller than 1 mm.

On figa and 3b is illustrated proposed in the invention approach to reproduce various kinds of information on fully sealed surface due to deliberate variation of the thickness of the paint layer between two values. On figa and 3b shown in the cross section of the part sealed in accordance with the invention, the information carrier. The thickness of the paint layer on separate sections 14 so different from the thickness of the paint layer to completely surround them (which is shown on the drawing the incision is not visible) sealed sections 13 that between such sections 13 and 14 occurs visually distinguishable color or brightness contrast. On figa thickness of the paint layer on separate sections 14 is greater than the thickness of the paint layer in the surrounding areas, while figb, on the contrary, the surrounding area 13 sealed thicker paint layer as compared with the thickness of the paint layer on separate sites 14. When using semi-transparent ink for sealing sections 13 and 14 areas with a thinner layer of paint look like with a lighter color that is. In this case, shown in figa separate sections 14 are in the form of darker areas on a light background, then as shown in figb separate sections 14 are visually perceived in a lighter color tone as compared with the surrounding sealed areas 13.

Thus there is an opportunity to play with different kinds of information using sealed, i.e. covered with paint, separate sections on the background also painted and surrounding areas 13. If the sealed section 13 by giving it a specific shape and contour also plays some information on the same part of the surface can be reproduced in a positive image of two superimposed one on another and bearing certain information of the image.

Figure 4 in the section also shows a snippet of the proposed invention of the media. In this case, the sealed portion of the surface integrated with a separate unsealed sections 15, which are completely surrounded (which is also not visible in the shown in the drawing section) sealed sections 13 and 14. Giving such unsealed portions 15 corresponding form allows them to play a different, additional information in the form of a negative image.

For the next 5-9 form in terms of increased mA is the headquarters presents various preferred embodiments of the proposed invention of the media. To simplify these drawings are presented only printed image or impression obtained according to the invention by a method of metallographic printing. The ratio between the sizes of sealed areas and individual sites correspond to these drawings real.

Figure 5 shows the number of 2000, every single figure which presents sealed according to the invention by section 13, on which the solid paint layer has a certain thickness. In each of these plays a single digit sealed sections 13 are completely surrounded them on all sides with separate sections 14 which are sealed over with a thick layer of colorful and therefore are visually perceived darker. In this example, this separate sealed sections 14 attached to this circuit is that each of them plays one digit. Figure 5-sequence of digits, reproducible separate areas 14, composed of the same number, which is reproduced by a sequence of larger sealed sections 13. It is obvious that the same way you can play any other alphanumeric characters, patterns, drawings or symbols. When used to get shown on the drawing stamp printing plates (the plates), parts of which are used for printing plots 13, wygrania the Ana, for example, to a depth of 15 μm, and the parts corresponding to the parts 14 of the imprint is engraved, for example, to a depth of 100 μm, between the sealed sections 13 and 14 of the media not only creates a visually distinct contrast, but also formed perceived by touch, the difference between the levels of the paint layer in these areas. This is due to the fact that a separate sealed sections 14, obtained using etched to a greater depth areas of the printing form, give the surface a media convex relief, clearly distinguishable by the touch of your fingertips.

Figure 6 shows the top 20 played sealed elements 13 by giving them the right path. Each of these two sections 13 represents one digit and contains separate sections 14 which are sealed colored layer of greater thickness and are therefore perceived as more dark. These separate sections 14 are arranged in two rows and in each case by giving them the right path also reproduce the number 20. Within the sealed thinner layer of colorful sections 13 additionally has surrounded them unsealed separate sections 15, which by giving them the proper contour or shape also plays the top 20. Thus one is picatinney part of the surface presents three types of information, which in this example correspond to each other in content. Two types of information are transmitted with a positive image, and the third type of information - using reverse images. Unsealed separate sections 15 are arranged in a grid within the sealed sections 13 and perimeter hem every pair of separate sections 14.

Shown in figure 5 and 6 the preferred embodiments, the height, respectively, the size of characters played sealed parcels 13 is about 1 see Signs of this size visually distinguishable even from a distance. Smaller separate areas 14, surrounded by areas 13, mostly played characters with a size of about 1 mm. Signs of this size is still quite good visually distinguishable to the naked eye from a distance of approximately 20-50 see If the image is integrated additional marks formed unsealed separate areas, they preferably are in the form of microscript or micronodes. The size of such signs is preferably only a few tenths of a millimeter. These are made with microlettering signs can be read without straining your eyes, only with the help of assisted magnifying device, such as a magnifying glass, and they form the stage is nitely protective sign, since such fine patterns cannot be reproduced with sufficient accuracy using a commercially available photocopier devices and scanners that do not have the necessary resolution.

On figa and 7b show two received proposed in the invention is a method of printing which sealed sections 13 reproduce alphanumeric characters (digits 2 and 0) and geometric figure (square). In this embodiment, the individual sections 14 is formed on the surface of the information carrier obtained by stamping and applying the paint layer pronounced topography and therefore also distinguishable by touch. Information produced in separate parts 14, corresponds in this case, a simple geometric shape in the form of a circle.

As the most well perceived by touch elements are especially suitable structure with geometrically simple circuit. The dimensions of each of these distinguishable to the touch elements are mainly composed of a few millimeters, and the distance between them is preferably at least about 0.5 mm Unsealed separate sections 15, integrated into a sealed parcel, reproduce shown in figa example, the number 20. Another preferred, not shown in the drawings option is to use neshap catanich individual sections 15 to reproduce in figure 2, formed one sealed section 13, only the same number 2, number 0, formed another sealed section 13, also play only the number 0.

On figb unsealed separate sections 15 made in the form of alphanumeric characters, which are arranged successively in rows and form micronodes. On the information content of these unsealed separate sections differ from the content playback sealed sections 13 and separate areas 14. When this line mikroneesia reproduced in the form of a negative image, alternating with rows consisting of rows of circles, reproducible separate areas 14 with thicker paint layer. In contrast, shown in figa example, the characters that are playable separate unsealed sections 15 and pairs separate sealed sections 14 are in vertical and horizontal directions in mutually alternating manner.

On Fig unsealed areas are located within the sealed area so that the imprint of the present first unsealed sections 16, which are surrounded by a sealed area with a small thickness of the paint layer, in this case, the sealed section 13, and the second unsealed areas 17 that the neighborhood is s continuous sealed surface with greater thickness of the paint layer, in this case, separate areas 14. On Fig first unsealed separate sections 16 reproduce figures 5 and 0. The second unsealed separate sections 17 are made form the same as the sealed darker separate sections 14, namely in the form of a square.

Figure 9 is sealed darker sections 13 reproduce figures number 50, while visually darker impression is created by sealing these areas thicker paint layer. Separate sections 14, surrounded by a sealed section 13, made in the form of alphanumeric characters, which together constitute a repeated word "EURO", after which each time followed by the character "$". These separate sections 14 are of a lighter shade, because the formed colored layer of smaller thickness. Information, which is reproduced within the sealed section 13 individual sections 14, also goes beyond the specified limits of the sealed section 13. In this example, the marks formed separate sealed sections 14 within the sealed area 13, are also on the unsealed part outside of this section 13. This option can be used in other versions of the invention.

1. The media, especially a banknote, a valuable paper or similar document with less than the least one sealed area (13) and at least one almost completely surrounded by this section is a separate part (14), the plot (13) and a separate section (14) is sealed by the method of metallographic printing and both these plots are sealed colorful layers of different thickness and distinguishable from one another.

2. The information carrier according to claim 1, characterized in that a separate part (14) is completely surrounded by land (13).

3. The information carrier according to claim 1 or 2, characterized in that the sealed area (13) and a separate section (14) are visually distinct from one another.

4. The information carrier according to any one of claims 1 to 3, characterized in that the sealed area (13) and a separate section (14) are accurate wiring to one another.

5. The information carrier according to any one of claims 1 to 4, characterized in that the section (13) sealed colored layer of smaller thickness compared with the thickness of the paint layer in a separate section (14) and designed in such a way that through it translucent background.

6. The information carrier according to any one of claims 1 to 4, characterized in that a separate section (14) sealed colored layer of smaller thickness compared with the thickness of the paint layer on the plot (13) and designed in such a way that through it translucent background.

7. The information carrier according to any one of claims 1 to 6, characterized in that the sealed area (13) and/or sealed in a separate section (14) is optional with at least one unsealed area (15, 16, 17), which is completely surrounded by the specified sealed section (13) or the specified sealed in a separate section (14).

8. The information carrier according to any one of claims 1 to 7, characterized in that the sealed separate section (14) and/or unsealed area (15, 16, 17) has the appearance of a font character, first of all alphanumeric characters.

9. The information carrier according to any one of claims 1 to 8, characterized in that the sealed separate section (14) and/or unsealed area (15, 16, 17) has the form of geometric shapes or geometric element, a graphic sign or symbol.

10. The storage medium of claim 8 or 9, characterized in that the section (13) has several separate sections (14) and/or unsealed areas(15, 16, 17).

11. The storage medium of claim 10, wherein the separate sections (14) and/or unsealed areas (15, 16, 17) have different performance and reproducible them types of information are interrelated, forming information from a single semantic content.

12. The information carrier according to any one of claims 1 to 11, characterized in that the sealed section (13) has a contour, which is determined by the contents of the reproducible information.

13. The information carrier according to item 12, characterized in that the individual sections (14) and/or unsealed areas (15, 16, 17) reproduces the same information as the information in proizvodima circuit sealed area (13).

14. The information carrier according to any one of claims 1 to 13, characterized in that the section (13) or a separate part (14) is discernible to the touch.

15. Media information 14, characterized in that the height distinguishable to the touch area (13) or a separate section (14) is relative to the surface of the media at least 25 μm, especially 40 microns.

16. The information carrier according to any one of p-15, characterized in that the colorful layers of at least two separate sections (14) have different thicknesses.

17. The information carrier according to any one of claims 1 to 16, characterized in that there are several sections (13), which preferably have different paths.

18. The information carrier according to any one of claims 1 to 17, characterized in that the respective parts (14) the plots are repeated outside the plot (13), resulting in reproducible these individual sections (14) information is also located in the surrounding area (13) part.

19. A method of manufacturing a sealed media, especially banknotes, securities or similar document, the basis of the seal method of metallographic printing, causing one stage of printing on a certain area and at least one surrounded them separate plot the paint layer of different thickness, resulting in a specified area and part of the capacity of land be visually distinguishable from one another.

20. Printed form for metallographic printing, having on the surface of the recess, characterized in that occupied by a single recess section (13) is completely surrounded by at least one separate section (14), which is engraved to a depth different from the depth at which the engraved area (13), and which at least partially surrounded by a dividing partition with sharply angled top.

21. Method of making printing plates for metallographic printing on the surface of the mold engrave fill in the printing process, paint deeper, forming a plot obtained in the subsequent imprint, wherein forming at least one separate area that is completely surrounded by the specified area and which engrave at a depth different from the depth at which engrave the surrounding area, removing in the process of etching material from the printing plate so that within a specified deepening remained partition with sharply angled top, at least partially surrounding private land.



 

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EFFECT: provided a high degree of protection against forgery of the information medium.

21 cl, 11 dwg

FIELD: important documents with protective attributes, combination of matters with two automatically controlled properties for protecting important documents against counterfeit, methods for making such documents and methods for testing authenticity of charred matters and ash.

SUBSTANCE: important document, mainly bank note or person certificate is characterized by use at least of two luminophors whose luminescent properties may be automatically and individually monitored. First luminophore irreversibly losses its luminescent properties at first temperature. Second luminophore irreversibly losses its luminescent properties at second temperature. First and (or) second temperature exceeds natural temperature of burning important document. It allows to identify document according to itself and also according to its ash and prevents possibility of illegal regeneration of materials designed for protecting against counterfeit in order to make duplicates of documents.

EFFECT: enhanced reliability of identifying important documents.

29 cl

FIELD: manufacture of securities.

SUBSTANCE: metallographic printing form has printing members disposed on working surface and made in the form of deepened strokes having cross section profile of asymmetric shape with various angles of inclination of side faces.

EFFECT: increased extent of protection of securities from counterfeit.

17 cl, 4 dwg

FIELD: manufacture of securities.

SUBSTANCE: method involves providing pattern comprising combination of ink layer protrusions and slots therebetween, with width of ink layer protrusions making at least 0.5 mm.

EFFECT: increased extent of protection of securities from counterfeit.

17 cl, 4 dwg

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