KR20080005201A - Security strip and security paper comprising same - Google Patents

Abstract

A security strip (1) consisting of sectors in which the background is non-continuous so that it is more difficult to duplicate by optical means than a continuous background, thereby making the strip harder to counterfeit. The non-continuous background consists of a dot pattern (2) printed using conventional printing techniques on an area (3) in which the repeated absence of dots defines a symbol (4), wherein the dots (2) of the pattern are geometrically and dimensionally distributed in such a way that they cannot be seen by the naked eye because the gap (3) between the dots cannot be discerned and the background appears to be continuous.

Description

Security strips and security papers incorporating such strips {SECURITY STRIP AND SECURITY PAPER COMPRISING SAME}

The present invention not only relates to security strips obtained by conventional printing means at lower cost, but also security, such as legal tender banknotes, bank checks or other forms of documents incorporating such security strips. It's about paper.

It is an object of the present invention to obtain a security strip, wherein the background of such a security strip is formed by a pattern of discontinuous dots that are difficult to reproduce by optical means in order to make its forgery difficult.

It is also an object of the present invention that the pattern of such points is simply obtained according to a particular geometric and dimensional distribution, such that the background appears to be continuous to the naked eye.

A common technique in the manufacture of security paper is the insertion of thin strips of material, such as polyester, which materials are used as security strips inserted in the paper to make forging of security securities difficult.

US 4 652 015 proposes a procedure for integrating a security strip in a security paper used for banknotes and bank checks and a strip formed so that characters in the strip are read only by the transmitted light and not visible under reflected light. do.

This security strip consists of a sheet of polyester coated by an aluminum sheet, on which the letters are printed by caustic soda resistant ink, which emits light when the non-reflective surface contacts the song soda. The letter is slightly raised.

If these characters are large, they can be seen under reflected light and thus can be imitated by counterfeiters using printing techniques through certain inks, which can trick the public even if not perfect. Light effects caused by metallic letters are not easy to reproduce; Since the characters occupy little space in the strip, the defects of the copy may not be recognized.

Known as a development in the technology used to make forgery more difficult, the security paper proposed in invention patent EP 0319 157, which is a repetitive mark, word or design, has two parts with no metal used. A waterproof security strip made of a metal sheet on at least one of the two sides. In contrast to the patent described above, the metal surface constitutes a background and therefore there is a larger continuous metal surface which makes the reproduction significantly more difficult, whereby the document can be inspected using reflected or transmitted light. The fact that no printing means exist that can mimic the contrast provided by continuous metal strips makes this reproduction more difficult.

One of the problems associated with printing techniques to achieve continuous metallization of the strip is that these techniques are not readily available to manufacturers and that printing is very slow, while the other problem is if the metal part of the security strip is If this is continuous and dark, it is associated with the integration of extremely complex fluorescent elements.

The proposed invention is a security strip or band obtained at a low cost by conventional printing techniques, which is hardly recognizable with naked eyes but with a point of view observed with suitable means of enlargement. In addition to producing a discrete background composed of patterns and distinguishing their features, the object of the present invention is a security paper incorporating the strip.

The pattern of dots on the security strip will generally constitute a background of letters or symbols that are merged onto the strips, letters or symbols to be formed by the absence of the dots.

One of the advantages derived from the present invention is that the configuration of the background is due to the discontinuous pattern instead of the continuous background, which makes it more difficult to reproduce by the optical means and thus obtains higher security.

Similarly, the construction of the background by the pattern causes merging of fluorescence, phosphorescence, cold light, magnetism and other elements within and / or in the spaces between the points, or areas of the points in different colors from the space by the use of fluorescent materials Can be distinguished.

Using a simple printing technique, it is possible to achieve a discontinuous pattern of dots with the features described for the difficulty of counterfeiting, while at the same time simulating a background that appears to be continuous with the naked eye.

For this reason the pattern of points has a distribution of points forming the pattern according to the series of geometrical features detailed below.

The points are distributed in lines and determine a screen rule consisting of 30 to 200 lines per centimeter, within a typical screen angle.

The minimum spacing between the centers of the points distributed on the same diagonal consists of 10 to 270 microns.

In order to facilitate a better understanding of the features of the present invention and to supplement the description, in accordance with a preferred embodiment of the present invention, the Applicant includes a set of illustrative and non-limiting drawings as an integral part of the above description, Indicates.

1 shows an enlarged view of a security strip section with respect to a banknote showing a background formed by a discontinuous pattern of points in which a member of the dot forms a symbol;

The security strip 1 of the present invention as shown in FIG. 1 consists of a sector having a discontinuous background consisting of a pattern of points 2 defined in the space 3, where a repeating member of the points ( absence) defines a symbol 4, in which the points 2 of the pattern are distributed geometrically and in size such that they are invisible to the naked eye, ie the space 3 between the points is barely noticeable.

In this respect, as discussed above, these points 2 are thought to be distributed in an ordered distribution with a density consisting of 30 to 200 lines per centimeter (cm).

Similarly, the distance a, shown in the figure, corresponding to the distance between the centers of the points 2 distributed on the same diagonal, consists of 10 to 270 microns.

Depending on this distribution of points 2 forming the pattern, the point 2 material may have fluorescent, luminescent or magnetic characteristics and the space 3 material may or may not have such characteristics or have a different way or similarly. It is contemplated that the point 2 material is fluorescent and the space 3 material also has fluorescent or other colors. On the other hand, the combination of luminescence or magnetic characteristics for the point 2 and space 3 with the material is also contemplated.

Security strips formed with the features described above can be incorporated in particular on paper such as banknotes, bank checks, etc., such that the security strips are equipped with security features that make forgery difficult.

The invention is not only applicable to security strips obtained by conventional printing means at lower cost, but also to security such as legal tender banknotes, bank checks or other forms of documents incorporating such security strips. Available for paper.

Claims (5)

In the security strip (1), On the space 3 is formed a sector in which a discontinuous background in a pattern of defined points 2 is observed, the repeated absence of the points defining the symbol 4, The dots 2 of the pattern are distributed in lines according to the concentration consisting of 30 to 200 lines per centimeter, The minimum distance between the centers of the points 2 distributed on the same diagonal consists of 10 to 270 microns, A security strip, characterized in that the points (2) are indistinguishable and the space (3) between the points is foreseen almost unrecognizable with the naked eye. 2. Security strip according to claim 1, characterized in that the dots (2) forming the pattern are made of a material selected from fluorescent, phosphorescent, cold and magnetic materials. 2. Security strip according to claim 1, characterized in that the space (3) is made of a material selected from fluorescent, phosphorescent, cold and magnetic materials. 2. Security strip according to claim 1, characterized in that the dots (2) and the space (3) forming the pattern are made of a material selected from fluorescent, phosphorescent, cold light and magnetic materials. A security paper incorporating a security band that can be obtained according to any one of claims 1 to 4.

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