RU2610398C1 - Device for printing of transient data; printed image and protected printing product - Google Patents

Abstract

FIELD: printing industry.

SUBSTANCE: device for printing of transient data in a sheet or web printing machine includes at least one magnetic system of image formation. The magnetic system of image formation is performed with the possibility to modify space configuration of magnetic fields during transition from one impression to another. In a specific case, the magnetic system of image formation is performed in the form of cylinder equipped with numerical disks with permanent magnets. The magnetic system of image formation may be performed in the form of a set of remotely-controlled magnetic heads or in the form of a set of remotely-controlled current buses.

EFFECT: provision of printing of a transient data on each subsequent sheet, increasing of protection level for printing products.

6 cl, 5 dwg

Description

The invention relates to the field of printing machines for sheet and roll printing, as well as to security elements on securities and identification documents.

For the printing of banknotes and identification documents, the urgent task is to form protective elements on the printed products to prevent possible fakes and imitations of similar products. To date, the capabilities of computer and copying technology have grown so much that counterfeit products are often difficult to distinguish in appearance. All over the world, new materials and printing technologies are being developed very intensively, which make it possible to form protective elements that are not reproducible by modern copying technology. In many cases, these are hidden images that are not copied by modern copying equipment and are difficult to reproduce by any well-known printing technologies.

For example, in the patent RU 2199446 C2, 02.27.2003, overlapping color images are used, made with varying degrees of color saturation so that the borders of the images are not noticeable during visual observation, and when copying they become clearly distinguishable. In US Pat. No. 5,443,579, image lines are drawn with a relief that can be distinguished using a magnifier or a microscope. When copying a relief is not reproduced. This allows you to distinguish copies of banknotes or documents made by counterfeiters. Similar protection technologies are proposed in US patents 5853197 and US 5487567. Watermarks and pseudo-watermarks are also not reproducible when copying. US6082778 describes an identification card with such pseudo-watermarks.

Another area of copy protection is based on the use of optically variable dyes, when the color of images or its elements changes depending on the viewing and illumination angles (EP 1239307). In this case, when copying, the color contrast and color-changing effects disappear.

The listed methods of protection are well known and widely used. Recently, many different dyes have appeared on the market, used for a wide variety of household applications, for example, in nail varnishes and other cosmetic products. Such dyes have become readily available and therefore can no longer serve as the basis for protective elements.

In this regard, dyes based on color-variable pigments with magnetic particles were developed and began to be used in the form of flat flakes (plates) with sizes of the order of 10–20 μm and a thickness of 1–5 μm. Particle surfaces are coated with interference thin-film structures that provide color variability of dyes based on them. Orienting the particles in the dye when printing images, they form color-contrast and color-changing images that are not reproduced during copying and practically are not imitated by other printing technologies (US 610336, US 5630877, WO 0300080).

A device for treating fabrics is also described, described in patent GB 1472426 A, 05/04/1977. The known device includes a magnetizable drum and a magnetic element that creates a magnetic field during operation of the device. Between the drum and the magnetic element passes tissue or paper, which is coated or printed image. Using the influence of a magnetic field in this case contributes to obtaining a high-quality uniform coating or printed image on fabric or paper. Obtaining variable information different from the information on each subsequent sheet is not provided.

Closest to the proposed technical solution is the solution proposed in patent RU 2333105 C2, 09/10/2008. A printing machine is proposed that allows printing images to be printed by screen printing on flat or roll media with dyes containing magnetic interference pigments. In the printing process, the magnetic lamellar particles of the ink layer are oriented in a certain way, creating a given spatial distribution of the magnetic particles. At the same time, corresponding color-contrast images with a color-changing effect are formed in the printed impressions. The color of the elements of the printed image changes with changing viewing angles and lighting.

The main disadvantage of the proposed technical solution is the inability to print on the specified machine a variable, for example, personal or numbering information, changing from sheet to sheet, as they are received sequentially.

The problem solved by the invention is the provision of printing variable information on each subsequent sheet.

This is achieved by the fact that the device for printing variable information in a sheet or web press includes at least one magnetic imaging system, in accordance with the invention, the magnetic imaging system is configured to change the spatial configuration of the magnetic fields during the transition from one print to another.

In a particular case, the magnetic imaging system is made in the form of a cylinder equipped with numbering wheels with permanent magnets. The magnetic imaging system can be made in the form of a set of remotely controlled magnetic heads or in the form of a set of remotely controlled current buses.

In addition, it is proposed obtained using the inventive device, a printed image with a color-changing effect, as well as a secure printing product, including such a printed image. The proposed printing products have a unique marking on each sheet - an image with a color-changing effect that allows you to control its authenticity.

In FIG. 1 shows a General diagram of a printing machine, including the inventive device. In FIG. 2 shows a variant of the inventive device in the form of a cylinder with numbering wheels. In FIG. 3 shows a variant of the inventive device in the form of a magnetic head formed by linear current buses. In FIG. 4 shows a variant of the inventive device in the form of a magnetic head formed by ring current busbars. In FIG. 5 shows a variant of the inventive device in the form of a magnetic head formed by movable magnetic rods.

The inventive device operates as follows. The printing machine (Fig. 1), similarly described in the known technical solution (RU 2333105 C2, 09/10/2008), includes a system for feeding 1, 2, 3, 4 of consecutive sheets to the printing cylinder 5; two plate-type screen cylinders 6 and 7 interacting with the printing cylinder, and also an output conveyor 8, which transports the printed sheets to the spreading tables. Screen cylinders 6 and 7 are equipped with squeegees 9, 10, due to which screen printing is carried out in two colors on successive sheets. A UV drying system for ink 11 is provided in the machine. Several magnetic systems 12, 13, 14 are mounted on the printing cylinder 5 and are spatially arranged in accordance with the impression sheets; each magnetic system is separated by recesses in the printing cylinder, in which grips are installed to hold the sheets on the cylinder. Magnetic systems 15, 16 can also be installed in the cylinder of the output conveyor 17 and / or in the intermediate cylinder 18.

At least one of the magnetic systems allows changing the spatial distribution of the magnetic field acting on the generated magnetic imprint at each new revolution. The configuration of the magnetic field in this case is individual for each print. For example, it can display the serial number of the print, personal or other individualizing data. This can be achieved by using numbering cylinders with magnetic wheels, or electronically controlled current magnetic matrices, or matrix printer heads with permanent magnets as needles, or matrix printer heads with electrically magnetized magnetic needles.

In FIG. 2 shows a schematic illustration of a numbering apparatus with wheels (19) made of magnetically rigid materials with high residual magnetization. When printed sheets pass over the printed numbering head, the stamps (20) of the numbering wheels are pressed from the unsealed side of the sheet under a screen print made with UV curable ink pigmented with magnetic particles with interference or color coatings. The ink, when passing the print over the numbering head, is in a viscous-flowing state (the UV curing process takes place at subsequent stages of the printing process). The scattering magnetic fields from the stamps pressed against the unsealed side of the sheet reorient the magnetic particles in the uncured impression. The spatial distribution of the magnetic fields of scattering from the stigma is determined by its relief formed on its surface, acting as an image of a certain number or symbol. A characteristic image of the mark appears in the print. When passing over the numbering head of each subsequent sheet, the wheels turn to new positions and the digital print in the print changes, the process of numbering or personalization of copies printed with magnetic paint is carried out.

In FIG. 3 and FIG. 4 shows the heads forming magnetic images in the above-described screen (silk-screen) prints made in the form of current-magnetic matrices. In FIG. 3 shows a matrix formed by linear current buses, into which currents are generated under the control of the controller 20, forming inhomogeneous magnetic fields orienting the magnetic particles in the print. As an example, the case is shown when a magnetic field H ₁₁ is formed in the cell (1,1) for a given direction of currents in the buses 1g, 2g, 1c, and 2c _{, which is} perpendicular to the imprint plane and sufficient to reorient the magnetic particles in it. In other cells, the addition of magnetic fields from flowing currents along the indicated buses does not occur, and accordingly, reorientation of magnetic particles practically does not occur in them, the magnitude of the magnetic field is not enough. By turning currents of the desired direction on and off in certain buses, you can create the specified spatial distribution of magnetic fields in the imprint plane, reorient the magnetic particles in the given cells and thereby form characteristic “magnetic” digital numbering and other identification images in it.

In FIG. 4 shows a schematic representation of a current-magnetic matrix head with ring current buses. Current buses are shown only for a cell (1,1). In this case, the localization of magnetic fields in the cells increases, which makes it possible to record images with higher quality (resolution), however, the operation of the control controller is somewhat more complicated (21).

Another design of the matrix magnetic head is shown in FIG. 5. Pointed movable magnetic rods (22) are placed in the cells of the magnetic head, which under the action of control signals (for example, current pulses forming control magnetic fields similar to the schemes described above) will be extended or moved away from the imprint plane, and thereby form spatially inhomogeneous magnetic fields and corresponding magnetic images in the print. The surface shape of the matrix magnetic heads in which the control magnetic fields are formed can be either flat or cylindrical depending on the path of the printed sheet in the printing machine.

Claims (6)

1. A device for printing variable information in a sheet or roll press, comprising at least one magnetic image forming system with ink containing pigments that can be oriented by a magnetic field, characterized in that the magnetic image forming system is configured to change the spatial configuration magnetic fields during the transition from one print to another. 2. The device according to claim 1, characterized in that the magnetic imaging system is made in the form of a cylinder equipped with numbering wheels with permanent magnets. 3. The device according to p. 1, characterized in that the magnetic imaging system is made in the form of a set of remotely controlled magnetic heads. 4. The device according to p. 1, characterized in that the magnetic imaging system is made in the form of a set of remotely controlled current buses. 5. A printed image with a color-changing effect, obtained using the device described in any of paragraphs. 1-4. 6. A secure printing product, including a printed image, described in paragraph 5.

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