RU2368509C2 - Protected or special paper with internal elements of tactile identification - Google Patents

Abstract

FIELD: textiles; paper.

SUBSTANCE: protected or special paper with internal elements of tactile identification consists of a sheet of paper with extending agents introduced and forming pattern or lettering. These agents when being pressed or heated or during sheet production or subsequent processes ensure sheet fanning-out, thus forming rounded and continuous relief embossing on the document surface.

EFFECT: invention makes it easier to identify and read bank notes especially for visually impaired people.

3 cl, 2 dwg

Description

The purpose of the invention

The present invention relates to security or special paper, which can be used as a medium for a document, banknote or any other format, which includes relief patterns or forms for tactile recognition and authentication.

The aim of the present invention is the introduction of a number of expanding agents in a security or special paper, distributed in such a way as to form various geometric elements, such as drawings or inscriptions, the volume of which increases when the document is exposed to pressure or heat, forming a series of bulges that will be characteristic convex drawing of the specified document. The goal is to facilitate the recognition of a document based on this medium by tactile means to prevent falsification by checking by touching that this convex pattern corresponds to a control embossing that identifies the specified document.

This security feature is especially designed to help blind people recognize or verify banknotes.

State of the art

It is known that the application of special heat-sensitive paints to an object on the surface of which there is a pattern or inscription, and exposure to them with heat or radiation leads to a thickening of the contour of the pattern or inscription, which remains raised relative to the rest of the surface.

Such paints can be used simply for decorative purposes with the aim of applying a distinctive feature to garments, cardboard boxes, metal sheets or, in particular, paper, or can also be used to transmit a message written in Braille for recognition by blind people and their training .

Patent for the invention EP 0 526 396 shows that such a paint, which may be colorless or have a certain color or colors, is applied to the surface and dried at a temperature lower than the expansion temperature, after which it is possible to apply varnish, and finally expose energy radiation, such as laser radiation, to heat the surface, which causes volumetric expansion of the paint.

Similarly, printing machines are used for the manufacture of banknotes of legal tender, on which ink layers of appropriate thickness form patterns that remain convex to facilitate their identification by blind people. The indicated embossing acts as a protruding relief relative to the horizontal surface of the banknote, as a result of which it is abraded during circulation, and ultimately, the embossing is made barely visible to blind people who can no longer recognize the specified banknote.

On the other hand, it is known that the use of microspheres as expanding agents in paper production increases its volume and thickness, while maintaining its original weight and stiffness. Through the use of these microspheres, it is possible to increase the volume by 18-22%, thereby providing significant savings on the cost of pulp required to obtain the same volume.

Such microspheres have a diameter of about 10-12 microns, and the structure of the thermoplastic coating, which comprises an expanding agent, such that when these microspheres are heated, the thermoplastic coating becomes elastic, and the agent inside it passes into a gaseous state, and the microsphere increases by 4 -5 times compared to its original diameter.

It should be noted that these microspheres are mixed with paper fibers and tend to expand at a certain temperature before the connection between these fibers becomes rigid enough to prevent this expansion, while the microspheres are strong enough to withstand mechanical stresses that occur at high temperatures.

Description of the invention

Protected or special paper according to the present invention is based on the selective use of expanding agents in certain areas of the paper pulp, which respond to heat and pressure, forming bulges that raise these areas relative to the rest of the paper, performed with identification characteristics for tactile recognition.

It is not clear when heat or pressure will be applied: during the paper production phase or in subsequent processes.

A final document made in this way can be a banknote or other type of security document designed to facilitate its tactile recognition and prevent its falsification, which will be recognized or identified when it is felt by touch that its embossing corresponds to the control embossing and the code that identifies the specified document.

The expanding agent can be introduced into specific internal or external sections of the paper, forming various geometric elements and patterns or labels, the volume of which increases when the document is exposed to pressure or heat. These elements can be arranged in random order, on one side or in a fixed pattern.

The expanding agent can be introduced into the center of a thin sheet of paper and expand up and down so that its upper and lower surfaces become convex, respectively, or the expanding agent can be inside close to one of the surfaces so that only one side of the sheet becomes convex.

Relief embossing formed on a sheet of paper as a result of the effect of volume expansion of an expanding agent has a rounded shape and continuity with respect to the horizontal surface of the sheet, which reduces the possibility of abrasion. Using it in banknotes provides a significant advantage compared to the previously described devices that use printing technology to form a protective embossing, as they allow blind people to identify a banknote even in the case of severe abrasion, since these banknotes will not be abraded to such an extent like ordinary banknotes, embossed on which is formed using printing machines.

Description of drawings

To complement the above description and to further clarify the characteristics of the present invention, a number of drawings are given in which a preferred embodiment of the present invention is presented as an illustrative and non-limiting example:

Fig. 1 is a side view showing a sheet of paper into which an expanding agent is introduced in a central part, under which a specified sheet of paper is represented with bulges formed on its upper and lower surfaces due to volumetric expansion of said agent;

figure 2 is a side view of a sheet of paper, on which you can see expanding agents distributed near its upper and lower surfaces, under which the paper sheet is represented with bulges formed on its upper and lower surfaces due to volumetric expansion of these agents.

Preferred Embodiment

The protected or special sheet according to the present invention can be used to issue banknotes of legal tender or any other type of document to facilitate their tactile recognition or to prevent their falsification and consists essentially of a sheet of paper (1) into which expanding agents are inserted (2 ), forming a drawing or inscription, which ensure the expansion of the sheet of paper (1), thereby forming a rounded and continuous embossing (3) on the surface of the document with the application of pressure or heat either at the paper production stage or in subsequent processes.

These expanding agents (2) can be introduced in the center along the thickness of the sheet (1), as shown in figure 1, in this case, when they expand, a bulge (3) is formed in accordance with their position on the upper or lower surface of the paper sheet ( one).

The expanding agents (2) can be introduced near the upper and / or lower surface of the paper sheet (1), as shown in FIG. 2, in this case, when they expand, a bulge (3) is formed on the side closest to the specified agents.

The location of these expanding agents in a sheet of paper can be in random order, on one side or in a fixed pattern.

In any case, it can be seen in FIGS. 1 and 2 that the formed bulge (3) is smooth and rounded, providing continuity with respect to the horizontal surface of the sheet of paper (1) to minimize its abrasion, in order to facilitate its recognition by blind people.

Claims (3)

1. Protected or special paper with internal elements of tactile recognition, which can be used to issue banknotes of legal tender or any other type of document to facilitate its tactile recognition or prevent its falsification, characterized in that it consists of a sheet of paper (1), into which expanding agents (2) are introduced, forming a pattern or inscription that ensure the expansion of a sheet of paper (1), thereby forming a rounded and continuous embossing (3) on the surface document upon application of pressure and heat, either in the manufacturing process of the sheet, or in subsequent processes. 2. Paper according to claim 1, characterized in that the expanding agents (2) are located in the center along the height of the sheet of paper (1), upon expansion of which a relief embossing (3) is formed in accordance with their position on the upper surface and lower surface of the paper sheet (one). 3. Paper according to claim 1, characterized in that the expanding agents (2) are introduced near the upper surface and / or lower surface of the paper sheet (1), upon expansion of which a relief embossing (3) is formed on the side closest to the specified agents.

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