JP2003131574A - Authentication seal - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a seal with which an unfair practice can be easily looked through by leaving a trace on the seal when the unfair practice that the seal is peeled without leaving a trace behind by dropping a solvent on the seal to soften an adhesive agent, the peeled seal is stuck on an imitation to sale the imitation by making the imitation look like the genuine, is performed. SOLUTION: An authentication seal produced by successively laminating a solvent-soluble ink layer, an adhesive agent layer and a release agent on one side surface of a base material, an authentication seal in which ink of the solvent-soluble ink layer consists of a solvent-soluble dyestuff and a polymer compound and an authentication seal in which a cholesteric liquid crystal layer is disposed on an opposed surface of the base material provided with the solvent-soluble ink layer, are provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an authentication seal which can be easily found to have been peeled off by a solvent.

[0002]

2. Description of the Related Art Seals such as certification seals and sealing seals are pasted on products, etc., then peeled off with a solvent and re-pasted on fake products. They are lined up in stores as if they were genuine products. Some acts were taken.
Conventionally, as a preventive measure, the adhesive strength of the adhesive is strengthened so that the seal is not peeled off, or when a cut is made in the base material of the seal and the seal is peeled off, the seal can be broken from the cut. Further, there has been adopted a method in which the strength of the base material itself is weakened and the base material is broken when the seal is peeled off so that the base material cannot be used again. Although these methods were effective in their own way, if solvent is dropped on the seal to soften the adhesive and peeled off carefully, it can be peeled off without leaving a trace on the appearance and it is attached to a fake product It was possible.

[0003]

[Problems to be Solved by the Invention]
In other words, when fraudulent acts such as dropping a solvent on the seal and softening the adhesive and peeling it without leaving a trace and pasting it on a fake product and selling it as if it was a genuine product, An object of the present invention is to provide a seal that can easily detect an illegal act by leaving a trace of such an illegal act on the sticker.

[0004]

The invention according to claim 1 is
It is intended to provide an authentication seal characterized in that an ink layer soluble in a solvent, an adhesive layer, and a release material are sequentially laminated on one surface of a base material.

The invention according to claim 2 provides the certification seal according to claim 1, characterized in that the ink of the ink layer soluble in the solvent comprises a dye soluble in the solvent and a polymer compound. is there.

The invention according to claim 3 provides the authentication seal according to claim 1 or 2, characterized in that a cholesteric liquid crystal layer is provided on the opposite surface of the substrate provided with the solvent-soluble ink layer. To do.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a solvent-soluble ink layer 2 (hereinafter referred to as “soluble ink”) and a pressure-sensitive adhesive 4, on one surface of a substrate 1.
A release material 5 is sequentially provided (hereinafter, this surface of the base material is referred to as a back surface side), and a corsteric liquid crystal layer 3 is provided on an opposite surface of the base material 1 (hereinafter, this surface of the base material is referred to as a front surface side). It is sectional drawing of a seal.

Paper is used as the base material. The reason for using paper is that the soluble ink melts and bleeds to the surface side of the substrate 1 due to a capillary phenomenon to form a trace. The thickness of the paper may be any thickness as long as the above-described bleeding effect of the melted soluble ink is clearly expressed, it is easy to handle as a seal, and an appropriate strength can be obtained. The paper having a weight of 90 kg has the best effect on the appearance of bleeding and the handling property. Also, the quality of the paper may be any of high quality paper, coated paper, art paper, etc., but unlike coated paper or art paper, fine paper does not have a clay layer applied on its surface, so bleeding due to capillary action is remarkable. It has the appearance and is the most suitable.

As the soluble ink 2, any ink may be used as long as it is an ink composed of a dye and a polymer compound that is soluble in a solvent, but it is preferable that the ink is soluble in a wide range of solvents. For example, when performing the above-mentioned wrongdoing, a dye and a polymer compound which are soluble in a solvent such as ethanol, toluene, ethyl acetate, etc., which are relatively easy to obtain for the actor, are selected and used. It is preferable to make the dye and the polymer compound soluble in the solvent as described in claim 2, because the bleeding effect is not significant when only the dye is soluble and the dye compound is sufficiently expressed when the polymer compound is dissolved. is there. The soluble ink is provided on the back surface side of the base material, because the presence of the soluble ink is hidden from an illegitimate person to make it difficult to expose the mechanism. Soluble ink layer can be offset printing, screen printing,
It is provided by printing by gravure printing, flexo printing, etc.

The pressure-sensitive adhesive 4 may be any material having adhesive strength to the adherend, and for example, a rubber-based, acrylic-based, urethane-based, epoxy-based, polyester-based pressure-sensitive adhesive is used. The thickness of the pressure-sensitive adhesive is not particularly limited, but is usually 5 μm to 50 μm.

The peeling material 5 may be a known one, and for example, one coated with a silicone resin, an alkyd resin, a polyethylene resin or a polypropylene resin or a mixture thereof is used. FIG. 2 is a plan view of the configuration of FIG. 1 and is a view of the front surface side of the base material. The surface is the letter 7 as shown.
(“Print”) or a pattern or the like may be printed with ordinary ink.

As the cholesteric liquid crystal layer 3, a cholesteric liquid crystal having a characteristic of selectively reflecting right polarized light or left polarized light of a specific wavelength is used. Due to this characteristic, green,
It exhibits vivid colors such as blue and gold. Therefore, the authentication sticker as claimed in claim 3 using such a cholesteric liquid crystal layer has a preferable effect that it is easy to find the wrongful act when it is re-adhered. In addition, the cholesteric liquid crystal layer 3 is passed through a circular polarization filter (not shown).
Looking at, the circular polarization filter and the cholesteric liquid crystal layer 3 have a characteristic that the reflected light from the liquid crystal layer is blocked or transmitted by the circular polarization filter depending on the polarization directions. For example, if the rotation direction of the circularly polarized light of the cholesteric liquid crystal 3 is right polarized light and that of the circularly polarized light filter is also right polarized light, the reflected light passes through the circularly polarized light filter, so that the color presented by the cholesteric liquid crystal layer 3 is to be seen. Can However, if the circularly polarized light filter has left-handed polarized light, the reflected light is blocked by the circularly polarized light filter and the color of the cholesteric liquid crystal 3 cannot be seen.

The material of the cholesteric liquid crystal layer 3 is not particularly limited as long as it is at room temperature, and any of main chain type and side chain type polymer liquid crystals can be used. Examples thereof include main chain type liquid crystal polymers such as polyester resins, polyamide resins and polycarbonate resins, and side chain type liquid crystal polymers such as polyacrylates and polymethacrylates. The formation of the cholesteric liquid crystal layer 3 is carried out by printing an ink in which scaly particles of the liquid crystal polymer are dispersed in various printing media, for example, screen printing using a screen printing medium, gravure using a gravure printing medium. Printing, flexographic printing, roll coating, etc. are used.

FIG. 3 shows a state in which the solvent is dripped at the end of the seal and the soluble ink is melted and oozes to the surface. In the figure, the light gray area 6 is the area where the melted soluble ink oozes out on the surface of the base material. A trace of change that is clearly different from that of the portion not dropped remains. Therefore, it is possible to easily find fraudulent attempts to drop the seal by dropping the solvent. The base material 1 may be made of a material such as a notch that easily breaks when it is peeled off using a solvent, or a brittle material that breaks the base material itself.

[0015]

Example 1 A soluble ink composed of a dye and a polymer compound solvent (manufactured by Toyo Ink Co., Ltd .: product The name P-140) is offset-printed in a letter shape by 1 to 2 μm, and an adhesive (manufactured by No Tape Co., Ltd .: product name G-471) is used.
2G) is screen-printed on the entire surface of 5 μm, and a release material 5 made of silicon resin (Arakawa Chemical Co., Ltd .: product name PO
LP201) is coated on the entire surface and liquid crystal polymer flaky particles (manufactured by Wacker Chemical Co., Ltd .:
The entire surface was screen-printed using an ink in which a product name cholesteric liquid crystal pigment) was dispersed in a medium (manufactured by Toyo Ink Mfg. Co., Ltd .: product name SSNSA medium).

(Example 2) Soluble ink as ink (Toyo Ink Co., Ltd .: product name P-140 and Toyo Ink Co., Ltd .: product name No. 3 mixed in equal amounts)
Then, the other conditions were the same as those in Example 1 were manufactured.

(Comparative Example 1) An insoluble ink (manufactured by Toyo Ink Mfg. Co., Ltd .: product name FD Carton P type) was used as the ink, and the other conditions were the same as in Example 1.

(Test) As a test, a solvent was dropped by a spoid, and after 30 seconds, it was sucked and dried. When toluene was dropped in Examples 1 and 2, the letters were yellow in the dropping portion and the letters remained orange in the non-dripping portion. At the boundary, in addition to the character part, orange bleeding occurred in a band shape to the extent that the character part could not be identified.

In both Examples 1 and 2, when heptane was dropped, the characters were reddish yellow in the dropping part, and the characters remained orange in the non-dripping part. At the boundary, in addition to the letters, orange bleeding occurred in the form of strips.

In both Examples 1 and 2, when MEK (methyl ethyl ketone), benzine, and hexane were dropped, the characters were yellowish orange at the dropping part in all cases.
The letters remain orange in the non-dripping part. At the border, pink bleeding occurred in strips in addition to the letters.

In each of Examples 1 and 2, when ethyl acetate was dropped, the characters were slightly yellowish orange at the dropping part.
The letters remain orange in the non-dripping part. At the boundary, light pink bleeding occurred in strips other than the letters. In any case, it can be easily discriminated visually as if a stain had occurred.

On the other hand, in the comparative example, all the characters remained orange in any dropping, and the boundary portion could not be identified. No abnormality was found in any case.

[0023]

As described above, according to the present invention, the soluble ink dissolves in the solvent and bleeds on the surface of the seal against fraudulent acts of dropping the seal on the seal and peeling off the seal, and then sticking it on the counterfeit product. Since it becomes a stain, fraud can be easily detected.

[Brief description of drawings]

FIG. 1 is a partially enlarged sectional view of an authentication seal according to the present invention.

FIG. 2 is a partial plan view of the authentication seal of FIG.

FIG. 3 is a partial plan view showing a state where a solvent is dropped on the end of the authentication seal of FIG. 1 to dissolve soluble ink and ooze to the surface.

[Explanation of symbols]

1 base material 2 Soluble ink 3 Cholesteric liquid crystal layer 4 adhesive 5 Release material 6 Light gray area 7 characters

Claims (3)

[Claims] 1. An authentication seal characterized in that an ink layer soluble in a solvent, an adhesive layer, and a release material are sequentially laminated on one surface of a substrate. 2. The certification seal according to claim 1, wherein the ink of the solvent-soluble ink layer comprises a dye soluble in a solvent and a polymer compound. 3. The authentication seal according to claim 1, wherein a cholesteric liquid crystal layer is provided on the opposite surface of the substrate provided with the solvent-soluble ink layer.