RU2700731C1 - Method of creating sheet material for counterfeit protection of securities and id - Google Patents

Abstract

FIELD: printing industry.

SUBSTANCE: invention relates to special types of printing. In the proposed sheet material, on each side of the plastic which is transparent to laser radiation, metal-coated diffraction gratings are placed opposite each other. These grates are simultaneously applied on the plastic layer by embossing and form on each of its opposite sides a recess of the diffraction grate which is deepened into the body of the plastic. Further, these grids are metallized, and one of them is coated with a layer of metallized foil. In proposed sheet material laser radiation pulses penetrating through metallized foil successively interact with two diffraction gratings, cause interference of beams reflected from diffraction gratings between them and metalized foil layer, as a result of which pairs of volumetric nanostructures are formed in channels formed by laser beams in metallized foil. When light material passes through sheet metal through channels in metallized foil, it is subjected to dispersion on non-demetallized sections of diffraction gratings and causes glow of pairs of volumetric nanostructures, making the luminous image visible in reflected light. In transmitted light, the same image is visible in form of transparent points owing to demetallized sections of diffraction gratings.

EFFECT: invention enables to obtain original images inside the disclosed sheet material for counterfeit protection of security papers and ID when exposed to laser radiation pulses.

3 cl, 2 dwg

Description

The present invention relates to special types of printing and allows you to get inside the proposed sheet material of the original image to protect against counterfeiting of securities and ID when exposed to this material by laser pulses.

The prior art.

A known method of creating a sheet of material to protect against counterfeiting of securities and ID (see, for example, RF patent No. 2537837 B44F 1/08).

In accordance with the known method, the sheet material is created from a layer of laser-transparent plastic coated with a layer of metallized foil and adjacent to the plastic layer of two metallized diffraction gratings isolated from one another with many holes in the recesses between their strokes parallel to each other and the layer of metallized foil .

The known invention allows to obtain two unique protective images in the sheet material, one of which in the reflected light is iridescent with the colors of the rainbow, and the other is in transmitted light also an image consisting of transparent dots.

These protective images are created in the sheet material when exposed to laser radiation pulses that pass through the layer of metallized foil into the sheet material and first create an image on it from the channel inlet openings in the foil. Further, these pulses interact sequentially with two diffraction gratings, cause ray interference between the gratings and a layer of metallized foil, and, ultimately, create a latent image of pairs of bulk nanostructures in the foil channels. The latent image turns into iridescent color under the influence of light rays passing through channels in the foil inside the sheet material, subjected to dispersion on diffraction gratings and causing the glow of pairs of bulk nanostructures.

However, the diffraction gratings in the sheet material according to the known invention are made separately, after which they are combined with each other and with a layer of plastic transparent to laser radiation. Therefore, such a material is not only laborious to manufacture, but also does not allow reducing its thickness to a size suitable for protection against counterfeiting of securities (including banknotes).

Also known is a method of creating a sheet material in which a diffraction grating is applied directly onto its surface by embossing followed by its metallization (see, for example, RF patent No. 2375194 B41F 19/02). However, to create the images described above in a sheet material, a single diffraction grating is not enough. It is necessary to create two parallel, isolated from one another diffraction gratings in a sheet material, in a certain way located between each other.

Disclosure of the invention.

The basis of the invention is the task of obtaining such a method of creating a sheet material for protection against counterfeiting of securities and ID, in which the original image in this material can be obtained with its minimum thickness and low manufacturing complexity.

The problem is solved in that in the method of creating a sheet material for protection against counterfeiting of securities and ID, which consists in placing on a plastic layer transparent to laser radiation, two metallized diffraction gratings and a layer of metallized foil, in accordance with the invention, the diffraction gratings are placed one opposite another on opposite sides of the plastic layer, transparent to laser radiation, these gratings are embossed on each side of the plastic, form on each of its counter The surface of the diffraction grating deepened in the plastic body is metallized, both reliefs of the diffraction gratings are metallized and one of them is covered with a layer of metallized foil.

With this method of creating sheet material, the technology of its manufacture is simplified and the thickness of the sheet material is minimized, which is extremely important for protecting securities from counterfeiting with unique protective elements.

It is advisable that in a plastic layer transparent to laser radiation, simultaneously relief images of two diffraction gratings are performed on both sides thereof.

With this method of creating sheet material, the most accurate mutual arrangement of diffraction gratings is ensured, which is necessary to obtain high-quality protective images in the sheet material.

It is advisable that the strokes on both diffraction gratings on each side of the plastic layer transparent to laser radiation have the possibility of interaction with them laser pulses transmitted through the sheet metal layer of metallized foil.

With this method of creating sheet material, the most effective interaction of laser pulses with strokes of diffraction gratings and obtaining a high-quality protective image inside the sheet material is ensured.

A brief description of the drawings.

The invention is further illustrated by the description of a specific, but not limiting embodiment of the present invention and the accompanying drawings, in which:

FIG. 1 - illustrates a method for creating sheet material for protection against counterfeiting of securities and ID;

FIG. 2 is a view along arrow K in FIG. one.

The best embodiments of the invention.

The proposed method of creating a sheet material for protection against counterfeiting of securities and ID is as follows.

The plastic layer 1, transparent to laser radiation, is simultaneously affected by dies 2 (position A) from two of its sides, the working surface of which 3 repeats the relief of 4 diffraction gratings. If necessary, the dies 2 can be equipped with means for heating (not shown in Fig.).

At position B, a plastic layer 1 is shown with a relief 4 of diffraction gratings applied thereon. At position C, the reliefs 4 in the plastic layer are coated with a metal layer, for example, aluminum by vacuum deposition, and two metallized diffraction gratings 5 are created in the plastic layer 1. Then, at position D, one of the diffraction gratings 5 is covered with a layer of metallized foil 6. FIG. 2 shows the strokes 7 of the diffraction grating 5 and the wells 8 in the recesses between them. To obtain the holes on the dies 2 in the corresponding places made ledges (in Fig. Not shown). Strokes and holes on diffraction gratings play an important role for the diffraction of laser radiation pulses transmitted into the sheet material and in the process of ray interference between diffraction gratings and a layer of metallized foil, as a result of which pairs of bulk nanostructures are created in the channels of the metallized foil.

Subsequently, these nanostructures shine in reflected light under the influence of light transmitted through channels in the foil into the sheet material and subjected to dispersion in the areas of diffraction gratings.

In transmitted light, the same image will be formed from transparent points due to the passage of light rays through the demetallized sections of diffraction gratings.

The proposed method of creating a sheet material allows you to minimize the thickness of the sheet material, simplify and reduce the cost of its manufacture.

Printing applicability.

The proposed method of creating a sheet material allows you to create unique images inside it, which are necessary for reliable protection against counterfeiting a wide range of printing products.

Due to the fact that the proposed method of creating sheet material minimizes its thickness, this material can be successfully used to protect against counterfeiting of securities, including banknotes, and any kind of ID.

Claims (3)

1. The method of creating a sheet of material to protect against counterfeiting securities and ID, which consists in placing on a plastic layer, transparent to laser radiation, two metallized diffraction gratings and a layer of metallized foil, characterized in that the diffraction gratings are placed one opposite the other on opposite sides of the layer plastic transparent to laser radiation, these gratings are embossed on each side of the plastic, form a relief deepened in the plastic body on each of its opposite sides ifraktsionnoy lattice metallized two relief diffraction gratings and are coated with one layer of metallized foil. 2. The method according to p. 1, characterized in that in the plastic layer transparent to laser radiation, relief images of two diffraction gratings are simultaneously performed from two sides thereof. 3. The method according to p. 2, characterized in that the strokes on both diffraction gratings on each side of the plastic, transparent to laser radiation, are arranged to interact with them laser pulses when they pass through a layer of metallized foil inside the sheet material.

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