RU2306374C1 - Grid of round grid-type papermaking machine for manufacture of forgery protected paper, method for manufacture of forgery protected paper, and forgery protected paper - Google Patents

Abstract

FIELD: production of paper for banknotes, securities, identity certificates or other protected printed products.

SUBSTANCE: grid has filigree members fixed on grid and designed for local reducing of paper water loss for producing of filigree watermark on paper. Filigree members are made in the form of various figures, patterns, or text produced by shaped cutting from sheet material. There are through apertures and/or slots provided in body of filigree member, said apertures having cross size below 500 micron and being designed for creating zones with higher water loss. Method involves forming paper web on grid of round grid-type papermaking machine; dehydrating during pressing of paper web; forming paper on grid in order to produce filigree watermark having additional picture provided on the background of filigree watermark and having higher optical density as compared to optical density of filigree watermark.

EFFECT: increased degree of protecting paper from forgery.

4 cl, 3 dwg

Description

The invention relates to a security element detected by visual verification of the authenticity of a security, banknote, identity card or other secure printing products based on an image formed in paper using filigree elements.

The principle of forming a filigree watermark in paper is based on creating on the grid areas with reduced water loss (not letting water pass) by soldering or welding filigree onto the grid. During the ebb tide, there is no deposition of paper pulp on the grid at the location of the filigree blank and water can go only to the sides, and the amount of deposited mass in this place will be less. As a result, areas with a density lower than the density of the main fabric, repeating the pattern of filigree, are formed in the paper web. The visual effect is similar to a stamped watermark, but in contrast to it, the filigree sign on paper has very clear boundaries for the transition of the sign into the main canvas.

A mesh of a round-mesh paper making machine for making watermarked paper is known, having filigree wire elements fixed to the grid to locally reduce the ability of the mesh to lose water to produce a filigree watermark on paper. Also described is a technology for forming a paper web using this mesh and a watermark obtained on paper (patent JP 6287883).

A limitation of the known technical solution is the insufficient complexity of the design of the manufactured watermark and, as a consequence, the insufficient degree of protection of securities.

The technical result of the proposed technical solution is to improve the protective properties of paper intended for the manufacture of secure printing products.

The specified technical result is achieved by the fact that the mesh of a round-mesh paper machine for the manufacture of counterfeit paper, having filigree elements fixed to the grid to locally reduce the ability of the mesh to lose water, to obtain a filigree watermark on paper according to the invention, is made with filigree elements in the form of various figures, pattern or text by means of figured cutting from sheet material, moreover, through holes and / or cuts are made in the body of the filigree element chnym size less than 500 microns for the creation of zones with a higher water loss.

In a method for manufacturing counterfeit paper, including forming a paper web on a mesh of a round-mesh paper machine, followed by dewatering in the process of pressing a paper web, according to the invention, the paper is formed on the grid described above to obtain a filigree watermark having an additional image located against a filigree background watermark and having a higher optical density compared with the optical density of the filigree watermark.

Counterfeit paper is made according to a method for manufacturing counterfeit paper.

The essence of the invention is shown in the following drawings:

Figure 1 - filigree element in the form of a field (plate) containing text.

Figure 2 - sample filigree element with an additional protective image in the form of graphic elements.

Figure 3 - enlarged image of a part of a filigree element

Filigree elements 2 are fixed on the grid 1 of a round-mesh paper machine for manufacturing tamper-resistant paper 2, which provide a local reduction in the ability of the net to lose water to produce a filigree watermark on paper. Through the body of the filigree element 2, through holes and / or slots 3 are made with a transverse size of less than 500 microns to create zones with higher water loss.

Filigree elements are made in the form of various shapes, patterns or text from sheet metal using curly cutting, which is performed using a laser or other currently existing precision cutting methods.

The watermark obtained on fake-protected paper is distinguished by the addition in the form of a micrograph and / or microtext. These additional elements are formed using through, throughout the thickness, slots and / or holes, and the filigree element in this place is a stencil. The width of these slots and / or the diameter of the holes is less than 500 microns and depends on which additional element is created, as well as on the technological parameters of the paper tint. The additional image may be text and / or any graphic elements against the background of the main width of the filigree, there may simply be lines or a dot for contrasting the main filigree drawing in its separate area.

In the process of forming a paper web on the mesh of a round-mesh paper machine, followed by dehydration in the process of pressing the paper web, the fine fiber fills holes or slots 3 (areas with normal water yield), forming an image that is visible to the light as negative. This is due to the fact that in the place where the watermark is formed in the paper, the density of the paper is much lower than the density of the main paper web. Due to the fact that in the filigree element 2 there are sections with normal water loss and in this place the fiber settles normally inside the filigree mark (in paper), sections with a density higher than the density against the background of the watermark are formed. It is these areas with increased density that form an additional element of protection against the background of the area with lower density.

The proposed method of obtaining a watermark using a filigree element on the grid of a paper machine allows you to get a protective element in the form of a watermark with an additional microimage, which is difficult to counterfeit and can be used for effective visual control of secure printing products.

Claims (3)

1. The grid of a round-mesh paper making machine for manufacturing anti-counterfeit paper, having filigree elements fixed to the grid to locally reduce the ability of the net to lose water to produce a filigree watermark on paper, characterized in that the filigree elements are made in the form of various figures, patterns or text by curly cutting from sheet material, and through holes and / or slots with a transverse size of less than 500 microns are made in the body of the filigree element to create zones with a higher second fluid loss. 2. A method of manufacturing a counterfeit paper, comprising forming a paper web on a mesh of a round-mesh paper machine, followed by dewatering in the process of pressing a paper web, characterized in that the paper is molded on a grid according to claim 1 to obtain a filigree watermark having an additional image located against the background of a filigree watermark and having a higher optical density compared with the optical density of the filigree watermark. 3. Tamper-resistant paper made according to the method of claim 2.

Images