JP2002082616A - Forgery preventive label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a forgery preventive label which allows the easy identification of forgery, alteration and modification. SOLUTION: This forgery preventive label is constituted by forming a metallic thin-film reflection layer 12 on the back of a film 11 which is recorded with information visualizable by an optical means on its front surface and has s security characteristic. The label is formed by partially reforming the film surface across a mask having openings of a specified shape, then laminating the metallic thin-film reflection layer 12, a tacky adhesive layer 13 and release paper 14 at the time of forming the metallic thin-film reflection layer. The adhesive strength of the metallic tin-film reflection layer of the portions subjected to the surface reforming treatment by the apertures of the mask to the film surface is greater than the adhesive strength of the tacky adhesive and the metallic thin-film reflection layer and the adhesive strength of the tacky adhesive and the metallic thin-film reflection layer is greater than the adhesive strength of the metallic thin-film reflection layer of the portions which are shielded by the mask and are not subjected to the reforming treatment to the film surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-counterfeit label using a special security film having an optically phase difference region, a polarization angle difference region, a hologram or a light diffraction grating pattern. When forcibly peeling off from the attached state for the purpose of forgery etc., a part of the film back reflection layer is destroyed and traces remain,
The anti-counterfeiting, falsification and alteration effects are further enhanced. The fields of application of the present invention are: licenses, passports, resident registration cards, identification labels such as identification cards, credit cards and prepaid cards, gift certificates, stock certificates, passbooks and other security labels, videos and toners. It is a label for identifying the authenticity of precision equipment such as cartridges and brand goods such as watches, and is suitably used for preventing forgery, falsification and alteration thereof.

[0002]

2. Description of the Related Art Conventionally, various methods have been studied as forgery prevention methods. One of them is disclosed in JP-A-9-689.
No. 26 and JP-A-9-81062 describe a label and a display method using a retardation film capable of confirming a hidden picture through a polarizing plate.
Labels using this technology show high anti-counterfeiting properties and have the advantage of excellent handling and durability.On the other hand, if the film has a certain strength, the label can be used even after sticking to the test object. There is a problem that it can be easily peeled off without being damaged and cannot be recognized, so that it is reused.

Further, Japanese Utility Model Publication No. 5-48210 discloses that
A hologram in which a pattern-like release layer is formed between the base material and the hologram-forming layer, and the hologram seal is adhered, and when the hologram is to be peeled off from the end portion, the base material and the hologram-forming layer are separated. Brittle seals are described. However, such a technique can be applied when the destroyed portion itself has security, but cannot be directly used when the destroyed portion itself has no security.

[0004]

Therefore, in the present invention,
Regarding security films with optically unique characteristics, even if the security part itself is not damaged, if it is forged, altered or falsified, it will appear visually clearly by a certain process Thus, the present invention has been completed.

[0005]

The first aspect of the present invention for solving the above-mentioned problems is that a phase difference region is partially provided, and a color difference based on the region is visually recognized through a polarizing plate. A label using a film that can visualize the display content by, after partially modifying the surface through a mask having an opening of a certain shape on the non-observation side film surface, Form a metal thin film reflective layer on the surface,
Further, there is provided a forgery prevention label characterized in that an adhesive is applied to the surface of the metal thin film reflection layer. Because of such a forgery prevention label, forgery, falsification, and falsification can be made difficult.

A second aspect of the present invention for solving the above problems is a security countermeasure label in which a metal thin film reflective layer is formed on the back surface of a security film having information recorded thereon which can be visualized by optical means. In, when forming a metal thin-film reflective layer, after performing a partial modification treatment of the film surface via a mask having an opening of a certain shape,
An anti-counterfeit label in which a metal thin film reflective layer, a pressure-sensitive adhesive layer, and a release paper are laminated in this order, and the adhesive force between the metal thin film reflective layer and the film surface at a portion that has been subjected to the surface modification treatment by the opening of the mask. Is larger than the adhesive force between the adhesive and the metal thin film reflective layer, and the adhesive force between the adhesive and the metal thin film reflective layer is shielded by the mask and the surface of the metal thin film reflective layer where the surface modification treatment was not performed is The anti-counterfeit label, which is larger than the adhesive strength of the anti-counterfeit label. Because of such a forgery prevention label, forgery, falsification, and falsification can be made difficult.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a forgery prevention label of the present invention will be described with reference to the drawings. FIG. 1 is a sectional view showing an embodiment of the forgery prevention label of the present invention. As shown in FIG. 1, the anti-counterfeit label 10 of the present invention uses a special film 11 having security on the surface side on which the display section is observed, that is, the label surface side, and its back surface (the non-observation surface of the special film). The side is hereinafter simply referred to as “back side” as described above.) The pressure-sensitive adhesive layer 13 and the protective release paper 14 are provided via the metal thin film reflective layer 12. On the back surface of the special film 11, there are formed a portion 111 in which the adhesive strength of the metal thin film reflective layer 12 is increased by the modification process, and a portion 110 in which the processing process is not performed and the adhesive strength is weak.

Special film 1 having security properties
1 is a substrate which is difficult to manufacture by itself and has security. There are various embodiments of the special film 11, and as an example, for example, a phase difference region where the phase is optically different from other portions is formed on the film surface, and the portion is visually recognized through a polarizing filter. Then, a film which can be visualized and viewed because the color development is different from other portions can be given. In this case, if the special film 11 itself is originally transparent and has no polarizing plate, its appearance is the same as the retardation film. When viewed through a polarizing plate, the color can be viewed based on the phase difference.

The formation of the regions having different phase differences can also be performed by various methods and is not particularly limited. A region having a different phase can be formed on the retardation film by thermal writing, and the film can be partially dissolved by a flat-pressure hot press or a solvent to give a retardation. The degree of the phase difference to be formed is not particularly limited, but from the viewpoint of visualization, the wavelength range of visible light of about 300 to 700 nm is appropriate. Such a retardation can form an optical retardation region by, for example, partially imparting a thermal history to a biaxially stretched film to remove the stretching effect or changing the thickness. If the retardation region is formed in a specific pattern, a certain pattern shape can be visually recognized using a polarizing plate. The technique for providing such a phase difference is also described in the above-mentioned JP-A-9-68926 and JP-A-9-81062.

Special film 1 having security properties
1 is not limited to only a film having a retardation difference region. The film surface has an area where the polarization angle is partially different from that of the other background part, and when the part is visually recognized through a polarizing filter, a difference in density occurs from the background part. This includes cases where it is possible to do so. The special film 11 having such a polarization angle difference portion is provided with a photoactive molecular layer which causes a change in molecular axis alignment by linearly polarized light on the film, and irradiates the film with linearly polarized light including a wavelength range absorbed by the molecular layer. When a dichroic molecular layer is provided on the photoactive layer, information can be recorded by utilizing the anisotropic arrangement of dichroic molecules. That is, if a film having such a photoactive molecular layer is irradiated with linearly polarized light through a mask, a portion having a different polarization angle can be formed.

The change in molecular axis orientation caused by irradiation with linearly polarized light may be caused by a photoactive molecule that loses the planarity of the double bond of the molecule and changes the twisted structure in the photoexcited state. Or C = N bond or C = C
Compounds having a bond are known. Details of the technology relating to these photoactive molecules are described in JP-A-7-261024.
And JP-A-9-183287.

The information that can be visualized by optical means may be a hologram pattern or an optical diffraction grating pattern. The hologram pattern or light diffraction grating pattern is formed by applying a photocurable resin on a base film, embossing a relief mold on the surface, directly providing a hologram or light diffraction grating pattern, and irradiating ultraviolet rays. be able to. Alternatively, the hologram pattern or the optical diffraction grating pattern may be one in which a material previously formed as a transfer foil stamping material is transferred onto a base film to form the special film 11.

The special film having security as described above can further have information recognizable by natural light. This provides the convenience that certain information can be confirmed with natural light without using a polarizing plate. There are various types of information that can be recognized by natural light. For example, there is a portion where characters or patterns are printed with printing ink or the like, or a portion where characters or patterns can be recognized by unevenness. Furthermore, a protective layer 15 may be provided on the surface of the special film 11. For the protective layer 15, a resin or the like having high transparency is used so that the information viewing of the special film 11 is not hindered.

The base material used for such a special film 11 includes polyvinyl alcohol, cellulose, acryl, methacryl, nylon, polyimide, polysulfone, polyetherimide, polyethylene terephthalate, triacetyl cellulose, polycarbonate, polypropylene, polystyrene and polyethylene. And films made of synthetic resins and natural resins.

FIG. 2 shows a state in which the anti-counterfeit label of the present invention is observed using a polarizing plate. 1 shows a forgery prevention label according to an embodiment of the present invention, wherein the forgery prevention label is visualized using a polarizing plate. This forgery prevention label 10
When the polarizing plate 20 is not used, the information is usually a transparent film, and the displayed information cannot be observed (FIG. 2A). When the polarizing plate 20 is used, genuine characters and the security pattern 18 can be observed at a predetermined angle position (FIG. 2B).

The visualization by optical means is not limited to the use of a polarizing plate, but also includes the case where illumination light is irradiated at a fixed angle. Therefore, a case where a hologram or a diffraction grating pattern which is difficult to recognize under normal conditions is observed under specific illumination conditions is also included.

The feature of the anti-counterfeit label of the present invention lies not in the special film 11 having security properties itself, but in the process of forming the metal thin film reflective layer 12 and the pressure-sensitive adhesive layer 13 on the back surface thereof and the characteristics of the process. Therefore, it will be described below. FIG. 3 is a diagram showing a situation in which surface treatment is performed on a special film having security properties. FIG. 3 (A)
FIG. 3B is a plan view seen from above the surface treatment apparatus, and FIG.
FIG. 4 is a cross-sectional view taken along line AA in FIG. Prior to forming the metal thin film reflective layer 12 on the special film 11, in the present invention, the back surface of the special film 11 is subjected to a corona discharge treatment or another treatment having an equivalent effect.

In the case of corona discharge treatment, the mask 21 is preferably formed in an endless belt shape,
A method is employed in which corona discharge treatment is performed while running in a state in which the mask 21 has a fixed shape opening 22 while running the special film 11 intermittently.
May be carried out by performing a discharge treatment via the. In the latter case, an endless belt-shaped mask is not required. Intermittently means that the mask 21 is relatively stopped with respect to the film 11 during corona discharge, and the film 11 runs relatively to the mask 21 during non-discharge.

As the shape provided on the mask, for example, a slit-shaped opening can be used. The opening width in the case of the slit opening is not particularly limited,
Considering that it is used for a label and a pattern is formed therein, it is generally several mm to 1-2 cm.
The width of the slit. If the area of the opening is too small, the metal thin film reflective layer 12 will remain on the release paper 14 together with the adhesive when the release paper is peeled off, so the area ratio between the opening and the other parts is It is determined by adjusting according to the kind of metal forming the special film base and the reflective layer. The mask is not limited to the slit opening, and may be of a polka dot shape, a square shape, a character pattern, or another specific shape.

The material used for the mask preferably has a certain strength, can be formed into a film or sheet, and does not cause deformation or curling when used continuously. Generally, polyethylene terephthalate, triacetyl cellulose,
Synthetic resins such as polycarbonate, polypropylene, polyester, and polystyrene and natural resins are used, and paper and metal plates may also be used.

The effect of the corona discharge treatment can be measured similarly to the wettability to water. In general, it is well known that the corona discharge treatment of a plastic film improves the wettability to water and improves the adhesion of the printing ink. The same applies to the adhesion of the metal layer by vacuum deposition.
Preferably, it has a wetting index of dyne / cm. As described above, by running the special film and the mask together, the portion covered by the mask is not subjected to the discharge treatment, and the opening is subjected to the discharge treatment to improve the adhesiveness. 111 and the unprocessed portion 110 are formed intermittently according to the mask shape.

In the present invention, after such a discharge treatment is performed, a metal thin film is laminated as a reflective layer on the treated surface by a general method such as a vacuum deposition method, a sputtering method or an ion plating method. The thickness of the metal thin film reflective layer is suitably in the range of about 20 nm to 1000 nm. As a metal material to be laminated, aluminum, chromium, gold, silver, tin, nickel, an alloy containing these metals, or a material having excellent reflectance such as titanium oxide and titanium nitride can be used.

After forming the metal thin film reflective layer 12, an adhesive layer 13 such as a pressure-sensitive adhesive is applied on the metal thin film reflective layer, and a release paper 14 for protecting the adhesive is further coated. The pressure-sensitive adhesive layer 13 preferably has good adhesiveness to the metal thin-film reflective layer, and generally, epoxy-based, acrylic-based, vinyl-based, synthetic rubber-based, and silicone-based general-purpose ones can be used. And these are from 1 μm to 30 μm.
Coating with a film thickness in the range of μm.

At this time, the adhesive force between the metal thin film reflective layer and the special film in the untreated portion of the surface, the adhesive force between the adhesive and the metal thin film reflective layer, the adhesive force between the metal thin film reflective layer and the special film in the surface treated portion, If you do, <<
Must be established. That is,
In this case, when the label is to be peeled off after being adhered to the article (test object), the peeling occurs first in the untreated part because the part has a small adhesive strength to any of the parts. The metal thin film reflective layer 12 does not remain on the label side (remains on the article side). On the other hand, since the treated portion has the maximum adhesive force, the metal thin film reflective layer is integrated with the special film 11 side, and even if the label is peeled off from the article, the metal thin film reflective layer does not remain on the article side (it remains on the label side). )

FIG. 4 is a view showing a completed anti-counterfeit label and a situation in which the label is peeled off from the article. FIG.
As shown in FIG. 1A, the anti-counterfeit label 10 is obtained by subjecting a special film 11 to a surface modification treatment and laminating a metal thin film reflective layer 12. The metal thin film reflective layer 12 is further coated with an adhesive layer 13, and a release paper 14 is provided to protect it. When attaching the forgery prevention label 10 to the article 40, the release paper is removed and the forgery prevention label 10 is attached. The article 40 is attached to the forgery prevention label 10 for the purpose of forgery, falsification or alteration.
When forcibly peeled off from the surface treatment portion 111, as described above, the adhesion strength with the metal layer is strong, so that the metal thin film layer 12 remains on the label 10 side, and the adhesion strength with the metal thin film layer in the untreated portion 110 is weak. The metal thin film layer will remain as a remarkable trace on the article 40 side.

FIG. 5 is a view showing a state after peeling from the article to which the forgery prevention label is attached. When peeled from the article 40 to which the elliptical anti-counterfeiting label 10 is attached, as shown in FIG. 5, the metal thin film reflection layer of the untreated portion 110 remains in the article in a stripe shape. As described above, the anti-counterfeit label of the present invention is a counterfeit, falsified, or falsified product because once peeled off, an inevitable mottle pattern of the metal thin-film reflective layer occurs on both the label side and the adhered article. Becomes obvious at a glance. Also, if an attempt is made to peel off without peeling off, traces thereof are recognized, and similarly, the will of forgery, falsification and alteration is recognized.

The surface treatment of the special film 11 is not limited to the corona discharge treatment, but may be any treatment method capable of modifying the surface condition of the film. An ozone treatment using an ultraviolet ozone cleaning device or a method of generating plasma by a plasma system and performing the treatment may be employed. In these treatments, a carbonyl group (C
= O) or a hydroxyl (-OH) functional group is considered to enhance surface adhesion.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
A corona discharge treatment was performed on the back surface of the special film 11 having a security property of a 0 μm polyethylene film using a mask as shown in FIG. A 50 μm-thick polyethylene terephthalate film (PET) is used as the mask 21, and a slit-shaped mask opening 22 having a width of 4 mm is formed so that the ratio of the surface-treated portion to the surface-untreated portion is 1: 1. What was formed in the shape was used. Using the discharge tube 30, the discharge tube is installed at a position close to the special film 11, and the speed is 10 m / m.
In, the special film 11 and the mask 21 were integrally run to perform a corona discharge treatment.

The wetting index (surface tension) of the surface-treated portion after the discharge treatment by the contact angle test method was 54 dyne / cm.
It was confirmed that the wetness index of the untreated portion of the surface was sufficiently improved as compared with 31 dyne / cm.

On the surface of the treated film, aluminum was deposited as a reflective layer to a thickness of 50 nm (500 °) by a vacuum deposition method, coated with a natural rubber-based pressure-sensitive adhesive layer, laminated with a release paper and cut. The anti-counterfeit label was completed. The completed label was peeled off from the release paper and adhered to a card made of vinyl chloride. After 24 hours, the label was partially peeled off as shown in FIG. The reflective layer was damaged and traces of peeling remained.

[0031]

As described above, the anti-counterfeit label of the present invention has a reflection layer provided on the back surface of a security film having optically unique characteristics, and the metal thin film reflection layer is provided with a portion having strong or weak adhesion. Therefore, even if the security part itself is not damaged, when a forgery or the like is performed, it appears visually clearly, so that forgery, falsification, and falsification can be effectively prevented.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of a forgery prevention label of the present invention.

FIG. 2 shows a state in which the anti-counterfeit label of the present invention is observed using a polarizing plate.

FIG. 3 is a diagram showing a situation in which surface treatment is performed on a special film having security properties.

FIG. 4 is a view showing a completed anti-counterfeit label and a situation in which the label is peeled off from an article.

FIG. 5 is a diagram showing a state after peeling from an article to which a forgery prevention label is attached.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Forgery prevention label 11 Special film which has security 12 Metal reflective thin layer 13 Adhesive layer 14 Release paper 15 Protective layer 18 Security pattern 20 Polarizer 21 Mask 22 Mask opening 30 Discharge tube 40 Article

Claims (8)

[Claims] Claims: 1. A label using a film which partially has a phase difference difference region and which enables visualization of display contents by visually recognizing a difference in color development based on the region through a polarizing plate, After partially modifying the surface through a mask having an opening of a predetermined shape on the observation surface side film surface, a metal thin film reflection layer is formed on the surface, and an adhesive is further applied to the metal thin film reflection layer surface. An anti-counterfeit label characterized by being coated. 2. An anti-counterfeiting label having a metal thin film reflective layer formed on the back surface of a security film having information recorded thereon which can be visualized by optical means, and having a fixed shape when the metal thin film reflective layer is formed. After partially modifying the film surface through a mask having an opening, a metal thin-film reflective layer, an adhesive layer, and a release paper are laminated in this order, and the anti-counterfeit label, wherein the opening of the mask The adhesive strength between the metal thin film reflective layer and the film surface of the portion where the surface modification treatment has been performed by the part is greater than the adhesive strength between the adhesive and the thin metal reflective layer, and the adhesive strength between the adhesive and the thin metal reflective layer is a mask. The anti-counterfeit label, wherein the part of the metal thin-film reflective layer, which is shielded by the non-surface-modifying treatment and has not been subjected to the surface modification treatment, has an adhesive strength to the film surface. 3. The surface modification treatment includes a corona discharge treatment,
3. The forgery prevention label according to claim 1, wherein the label is subjected to an ozone treatment or a plasma treatment. 4. The forgery prevention label according to claim 1, wherein the forgery prevention label further has information printed on a surface visible from the observation surface side. 5. The information which can be visualized by the optical means is information which has a polarization angle difference region and enables a change in shading based on the region to be visually recognized through a polarizing plate. Anti-counterfeit label. 6. The forgery prevention label according to claim 2, wherein the information that can be visualized by optical means is a hologram pattern. 7. The anti-counterfeit label according to claim 2, wherein the information that can be visualized by optical means is an optical diffraction grating pattern. 8. The forgery prevention label according to claim 1, wherein the opening having a predetermined shape is a slit-shaped opening.