JPH11344930A - Forgery preventive thermosensitive recording medium - Google Patents

Abstract

PROBLEM TO BE SOLVED: To warrant that the thermosensitive recording medium itself is genuine, i.e., the article is genuine, by printing the surface of a supporting sheet with patterns to be used as watermarks and forming a milky white thermosensitive color development recording layer on this surface. SOLUTION: A label 1 has the thermosensitive color development recording layer 4 mixed with a leuco dye (basic leuco dye, for example, crystal violet lactone) and a color developer (acidic phenolic compd., for example, p- hydroxyphenyl) on the surface of the supporting sheet 3 consisting of paper (general paper and synthetic paper) as a base material and has an over-coating layer 5 formed by applying a transparent resin on its surface. In such a case, the thermosensitive color development recording layer 4 before color development is milky white. The over-coating layer 5 consisting of the transparent resin is flexible and lustrous and withstands the heat of a printing head. The rear surface of the supporting sheet 3 has an adhesive layer 6 coated with an adhesive and is stuck with release paper 2. The title of the label, a code, a price and the watermarks patterns appear on the surface of the label.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a recording medium belonging to a class of labels, tags and tickets which can be printed and is difficult to forge.

[0002]

2. Description of the Related Art Labels, tags or price tags to be attached to products must be a recording medium that can be printed on the surface as required, and that the source and quality of products, such as so-called brand products and manufacturer products, are genuine. Some of them are required to have a function to guarantee that they are appropriate. Also, securities such as a gift certificate, a pass, or a ticket are required to be genuine as well as a recording medium that can be printed on the surface. For this reason, various countermeasures for preventing forgery have been conventionally taken for this type of recording medium. One of these is the adoption of a "watermark" utilizing the difference in translucency in terms of material, in which a special pattern such as a character, a logo mark, or a symbol is formed on paper, which is the base of a bill or gift certificate.

[0003] Since the means for producing the watermark requires special papermaking technology, it is generally difficult to obtain paper.
This is to prevent counterfeiting. However, it is difficult to clearly express fine characters, logo marks or symbols as watermarks. In addition, the cost is high for a small amount.

As a means for forming a watermark, there is a method in which a normally-made paper is ground and thinned by applying a grinder to a pattern portion to be used as the watermark. In the case of production, it is still expensive. Further, recently, a technique has been developed in which the transparency of a substrate is partially varied with a printing ink to obtain a watermark effect, so that a watermark product due to the difference in transparency can be easily manufactured. For this reason, the function of preventing forgery of “watermark” using the difference in the light transmittance of the material is gradually weakening.

[0005]

An object of the present invention is to provide a forgery-preventing thermosensitive recording material which can obtain a forgery-preventing effect by a watermark which does not depend on the difference in the light transmittance of the substrate and can be printed on the surface. Make it an issue.

[0006]

A pattern used as a watermark is printed on the surface of a support sheet, and a milky white thermosensitive coloring layer is formed on the surface. At this time, a specific maker obtains a finished product by using a unique technique and material, such that a printing maker performs printing of a pattern used as a watermark and a paper maker forms a thermosensitive coloring layer. As a result, it is generally impossible to know how to obtain and handle the material, and it is difficult to forge. Then, the pattern printed on the support sheet can be seen as a watermark by the user through the heat-sensitive coloring layer, and the user must confirm that the label is genuine and that the item is genuine. Can be. If there is any doubt about the authenticity of the heat-sensitive coloring layer with a higher milky white degree (such as a label) so that the watermark pattern is not conspicuous, the heat-sensitive coloring layer is shaved off and printed in detail on the surface of the support sheet. The authenticity is determined by comparing the logos and patterns thus obtained.

A pattern used as a watermark is sometimes printed in light yellow or light gray. Such a color pattern can be used in a case where it is difficult to emphasize a watermark pattern appearing as a background, which is inconspicuous because it is opaque to the milky white color of the thermosensitive coloring layer. An overcoat layer for protecting the thermosensitive coloring layer may be further formed on the surface of the thermosensitive coloring layer. The present invention is applied to a label or a tag such as a label or a tag in which the heat-sensitive coloring layer develops a striated color due to unexpected abrasion and the surface is easily stained. An adhesive layer may be provided on the back surface of the support sheet, and a release paper may be attached. Useful for labels. Also, since the formation of the adhesive layer is a special technology of the adhesive maker, apart from the formation of printing and thermosensitive coloring layer,
It becomes more difficult for the general public to obtain the finished product according to the present invention.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows an example in which a label 1 is affixed to a strip-shaped release paper 2, in which A is an example before printing by a thermal printer and B is an example after printing. As a product, a product before printing is provided wound on a roll.
This label 1 is used for the purpose of assuring that the parts provided are genuine. As shown in FIG. 2, the label 1 has a leuco dye (basic leuco dye, for example, crystal violet lactone) and a developer (acidic) on the surface of a support sheet 3 based on paper (general paper and synthetic paper). It has a thermosensitive coloring layer 4 mixed with a phenol compound (for example, p-hydroxyphenyl), and further has an overcoat layer 5 formed by applying a transparent resin on the surface thereof. As the support sheet 3, synthetic paper, resin film, or the like can be used in addition to paper. The leuco dye and the color developing material are ordinary, but the thermosensitive coloring layer 4 according to this embodiment before coloring is milky white. In order to increase or decrease the degree of milky white of the thermosensitive coloring layer 4, the amount of the whitening agent mixed into the thermosensitive coloring layer is adjusted. When a coloring material such as a pigment is used, the thermosensitive coloring layer 4 can be colored in various colors.

The overcoat layer 5 made of a transparent resin is flexible and glossy and resists the heat of the print head. . The lower surface of the support sheet 3 has an adhesive layer 6 coated with an adhesive, and the release paper 2 is attached thereto. The adhesive layer 6
It is formed by applying an acrylic adhesive or a rubber adhesive, and the release paper is a normal one, and is a glassine paper coated with a release material (silicon or polylaminate).

On the surface of the label 1, the label title "Nozaki Junsei Parts" and the code "K
ph-30 ", the price" $ 4800- "and the watermark pattern [NOZAKI] appear. In this embodiment, the title and the watermark pattern are printed on the surface of the support sheet 3 before forming the thermosensitive coloring layer 4. The watermark pattern is a ground pattern and is printed in light yellow. Although the watermark pattern is simplified from the relationship shown in the figure, a more complicated pattern is preferable to make forgery difficult. Further, the color tone and the definition when seeing through the thermosensitive coloring layer 4 can be freely changed by adjusting the density of ink or the like, adjusting the size of halftone dots, adjusting the screen ruling, or multicolor printing.

As a manufacturing process of the label 1, first, a title and a watermark pattern are printed on a sheet of the support sheet 1. The printed paper is sent to the step of forming the thermosensitive coloring layer 4, and the thermosensitive coloring layer 4 is formed on the printing surface. Although this layer 4 is milky white, it is formed in close contact with the surface of the support sheet 3 so that the title and the watermark printed on the support sheet 3 can be seen through the surface. At this time, the title is fat,
Since it is printed in a clear color, it can be clearly seen through the milky white thermosensitive coloring layer 4, while the watermark pattern is printed in pale yellow and is not noticeable. Then, the thermosensitive coloring layer 4
Is formed with an overcoat layer 5 in order to protect it from accidental abrasion. Further, the adhesive is applied to the back surface of the paper and the release paper 2 is attached to the back surface processing step. Further, before the cutting process, the label 1 is shaped into a shape, wound up on a roll, and cut in a row for each row of labels.

Since the formation of the thermosensitive coloring layer 4, the printing of a title and the like, and the formation of the adhesive layer are separate and specialized techniques, it is extremely difficult for a general person to carry out the above process. Label 1 obtained as a product is printed with code and price using a so-called thermal printer.
Attach to the target product. Since printing by a thermal printer can be performed over a wide variety of types, a single type of label can be used efficiently. Moreover, the label itself is guaranteed to be genuine by the watermark pattern.

As described above, the label has been mainly described as the heat-sensitive recording medium.
It can be applied to gift certificates, toll tickets, certificate stamps and the like. Therefore, depending on the thermal recording medium to be applied, the overcoat layer 5 may be missing, or the adhesive layer 6 and the release paper 2 may be missing.

[0014]

According to the structure of the first aspect, since the technique of printing on the support sheet and the technique of forming the heat-sensitive coloring layer are combined, duplication is difficult and the effect of preventing forgery is high. Thereby, the thermal recording medium itself is authentic,
As a result, it is possible to guarantee that the article to which the thermosensitive recording medium is attached is genuine. On the other hand, printing by a thermal printer is possible, and it is possible to obtain a thermosensitive recording medium that is difficult to forge in a large variety and in a small amount at low cost. Since the watermark pattern is formed by printing, the watermark can be made complex, fine and colorful, which makes it difficult to forge and has a design effect.

According to the second aspect of the present invention, the surface of the thermosensitive coloring layer is less likely to be unexpectedly rubbed by the overcoat layer to develop color, and the surface of the thermosensitive recording medium is not stained during the distribution process. Can be prevented. According to the configuration of the third aspect, since the adhesive layer is provided on the back surface of the support sheet and the release paper is attached, it is convenient for the attaching work, and furthermore, the number of steps requiring special techniques is increased, and forgery is performed. Is more difficult.

[Brief description of the drawings]

FIG. 1 is a plan view of a label provided with a release paper.

FIG. 2 is a schematic diagram showing a cross section of a label.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Label (forgery prevention recording material) 2 Release paper 3 Support sheet 4 Thermal coloring layer 5 Overcoat 6 Adhesive layer 7 Pattern to be a watermark

Claims (3)

[Claims] 1. A forgery-preventing thermosensitive recording material characterized in that a pattern to be used as a watermark is printed on the surface of a support sheet, and a milky white thermosensitive coloring layer is formed on the surface. 2. The forgery-preventing thermosensitive recording medium according to claim 1, wherein an overcoat layer for protecting the thermosensitive coloring layer is further formed on the surface of the thermosensitive coloring layer. 3. The forgery-preventing thermosensitive recording medium according to claim 1, wherein an adhesive layer is provided on the back surface of the support sheet.