JP7214307B2 - Fraud Detection Sticker and Fraud Detection Sticker Set - Google Patents

Description

TECHNICAL FIELD The present invention relates to a fraud detection sticker for detecting the presence or absence of fraud such as falsification.

In recent years, the distribution of counterfeit products has been expanding internationally. Counterfeit means are classified into fraudulent acts such as product copying, alteration/falsification of product attribute information, and fraudulent reuse of containers. As fraud detection technologies and products for detecting the presence or absence of such fraudulent acts, there are security seals (for example, Patent Documents 1 and 2) in which designs such as letters and patterns appear as traces of peeling, and light interference such as holograms. Authenticity determination techniques used (for example, Patent Documents 3 and 4) are known.

It is also considered to combine multiple fraud detection technologies. Patent Literature 5 discloses a security label that combines multiple fraud detection techniques. The security label has a) a supporting substrate, b) a reflective layer or layer with a high refractive index, c) a partial release paint layer, d) a full-surface adhesive coating, and an adhesive agent between layer c) and layer d). layer is located. Also between layer a) and layer b) there may be located one or more further layers having optical, optically active, diffractive, electrically conductive and/or magnetic properties. . When the label is removed and attempted to be tampered with, the adhesion-mediating layer destroys the adhesion of layer b) to the support substrate a) where the partial release paint layer c) is not present, and the partial release paint layer c) The layer b) is separated from the support substrate a) in areas where ) is not present. Also, after an attempt to tamper with the label, not only the torn surface but also the portion of the label remaining on the object to be secured becomes dry and non-adhesive.

Japanese Patent Application Laid-Open No. 2003-316271 JP-A-2003-345255 Japanese Patent No. 4685101 Japanese Patent No. 3338860 Japanese Patent No. 5492292

By the way, a fraud detection sticker using a plurality of fraud detection techniques is effective in preventing fraudulent activity, because it is necessary for a person who intends to commit fraud to deal with each fraud detection technology. However, this type of conventional fraud detection sticker (the label described in Patent Document 5) loses its adhesiveness when it is peeled off, so it cannot be reattached to an article container such as a box. not very convenient for For example, after peeling off the fraud detection seal from the article container and confirming the articles in the article container, the authorized user may want to return the item to the article container and manage it without using it immediately. In such a case, a separate seal is required to return the article container to the closed state in order to properly manage the articles such as preventing dust from entering the article container.

The present invention has been made in view of such circumstances, and an object of the present invention is to configure a fraud detection sticker that uses a plurality of fraud detection technologies so that it can be reattached after being peeled off from the adherend. do.

In order to solve the above-mentioned problems, the first invention provides a seal support having a base material, an authenticity determination layer laminated on the front side of the seal support and formed with a pattern for authenticity determination, and a seal support. A release layer partially laminated on the back side, an ink layer laminated so as to fill the area between the release layers on the back side of the seal support, and an adhesive layer covering the release layer and the ink layer on the back side of the seal support. When the seal support is peeled off after the adhesive layer is attached to the adherend, peeling occurs at the boundary or inside the release layer in the release layer formation region, and the seal support is peeled off. This fraud detection seal exposes an integrated adhesive layer on the seal support side or the adherend side.

In a second aspect based on the first aspect, the authenticity determination layer is composed of a printed layer on which a pattern for authenticity determination is formed with ink.

A third invention is the second invention, wherein the resolution of the printed layer is 4000 dpi or more.

In a fourth invention, in any one of the first to third inventions, when the seal support is peeled off after the adhesive layer is attached to the adherend, the seal support and the release layer are formed in the release layer formation region. Peeling occurs at the boundary between the adhesive layer and the adherend, and peeling occurs at the boundary between the pressure-sensitive adhesive layer and the adherend in the region between the peeling layers.

In a fifth invention, in any one of the first to fourth inventions, the color of the ink layer is white.

A sixth aspect of the invention is a fraud detection sticker set comprising any one of the first to fifth fraud detection stickers and an optical sheet used for authenticity determination using an authenticity determination layer.

In the present invention, when the seal support (tamper detection seal) is peeled off from the adherend, the pressure-sensitive adhesive layer integrated with the seal support or the adherend is exposed. Therefore, the fraud detection sticker can be attached to the adherend again.

In addition, in the present invention, when the fraud detection seal is peeled off from the adherend, peeling occurs at the boundary or inside the peeling layer in the peeling layer formation region. Therefore, when a falsifier peels off the fraud detection seal, a trace remains in the region where the peeling layer is formed, so fraud can be detected. Fraud can also be detected by using an authenticity determination layer. Since at least two fraud detection techniques are used in the present invention, fraud can be effectively prevented.

Further, in the present invention, the authentication layer is laminated on the front side of the seal support. Here, when the fraud detection sticker is peeled off, the stress acting on the front side differs between the formation area of the release layer that is easily peeled off and the other area (area between the release layers). Therefore, when the authentication layer is laminated on the back side of the seal support, the function of the authentication layer (hereinafter referred to as "authentication function") may be impaired unless a structure for protecting the authentication layer is provided. . In contrast, in the present invention, the seal support protects the authenticity determination layer against the stress applied when the fraud detection seal is peeled off. With a simple structure, the authenticity determination function can be maintained even after the fraud detection sticker is removed.

Further, in the present invention, considering the convenience of regular users, it is possible to re-attach the tape after peeling it off from the adherend. Here, from the viewpoint of preventing fraudulent acts, a configuration such as the security label described in Patent Document 5 that cannot be reattached after being peeled off is effective. In contrast, in the present invention, even if the fraud detection sticker is peeled off and then reapplied, fraudulent activity can be detected. Therefore, fraudulent activity can be sufficiently prevented even if the sticker can be reapplied. In addition, it is quite conceivable that a person who commits a fraudulent act peels off the fraud detection sticker and then replaces it with another sticker with a similar appearance and attaches it again. Even in such a case, it is possible to easily check whether or not fraud has been committed by checking the presence or absence of the authenticity judgment function used in official fraud detection stickers, so fraud can be detected more accurately. is possible.

In the third invention, the print layer has a resolution of 4000 dpi or more. The CTP (Computer To Plate) setter required to obtain this level of resolution is owned by only a limited number of companies, and it is difficult for those who intend to commit fraud to obtain a CTP setter. According to the third invention, forgery of the fraud detection sticker can be suppressed.

In the fifth invention, since the color of the ink layer is white, the visibility of the authenticity determination layer can be improved.

FIG. 1 is a schematic diagram showing a cross-sectional structure of a security seal according to this embodiment. FIG. 2(a) is a schematic diagram showing the cross-sectional structure of each of the authenticity determination layer of the security seal and the lens sheet, and FIG. 2(b) is an enlarged plan view showing a part of the lens assembly in the lens sheet. is. FIG. 3 is a schematic diagram showing the cross-sectional structure of the security seal peeled off from the adherend. FIG. 4 is a schematic diagram of the substrate viewed from the front side after the security seal has been peeled off from the adherend. FIG. 5 is a schematic diagram for explaining a virtual image seen during authentication. FIG. 6 is a schematic diagram showing a cross-sectional structure of a security seal according to another embodiment. FIG. 7(a) is a schematic diagram showing a cross-sectional structure of a tape different from FIG. 6, which is a security seal according to another embodiment, before peeling, and FIG. It is the schematic which shows a cross-sectional structure.

Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1-7. The following embodiments are examples of the present invention, and are not intended to limit the scope of the present invention, its applications, or its uses.

[Structure of security seal]
As an example of the fraud detection seal 10, a roll-shaped security seal 10 (also referred to as a "security tape" or "security label") will be described. The security seal 10 is a seal provided with a peeling structure 16 on the back side and an authenticity determination layer 12 on the front side that utilizes light interference as fraud detection means. The security seal 10 includes, in order from the front side, an authenticity determination layer 12, a seal support 14 having a substrate 15, a release structure 16, an adhesive layer 19, and a separator 20.

The seal support 14 is composed of a strip-shaped elongated base material 15 . A transparent or translucent film is used for the base material 15 . The thickness of the base material 15 is 20 μm or more and 80 μm or less (for example, 38 μm), preferably 30 μm or more and 50 μm or less. It should be noted that the seal support 14 may be composed of only one substrate 15 or may be composed of a plurality of substrates 15 integrated together. In addition, the seal support 14 may further comprise a layer (eg, an undercoat layer) integrated with the front or back surface of the substrate 15 .

Materials for the base material 15 include polyethylene resin, polypropylene resin, polyurethane resin, polyamide resin, ethylene-vinyl acetate copolymer resin, polyester resin, polyvinyl alcohol resin, polyacrylate resin, polycarbonate resin, fluorine-containing copolymer resin, A thermoplastic resin such as polystyrene resin can be used. Specifically, a polyethylene terephthalate (PET) film, a biaxially oriented polypropylene (OPP) film, or the like can be used as the base material 15 .

When the security seal 10 is peeled off from the adherend 30, the peeling structure part 16 is peeled off to reveal a predetermined design (design such as letters, patterns, or patterns) as a trace of peeling. The release structure part 16 is composed of a release layer 17 partially laminated in a predetermined design on the back side of the base material 15 (seal support 14), and laminated so as to fill the area between the release layers 17 on the back side of the base material 15. and a coated ink layer 18 . The release layer 17 is in contact with the back surface of the substrate 15 . In addition, the ink layer 18 covers not only the region between the release layers 17 but also the formation region of the release layer 17 . The ink layer 18 is in contact with the back surface of the substrate 15 in the region between the release layers 17 and is in contact with the release layer 17 in the region where the release layer 17 is formed. In addition, the ink layer 18 may be provided only in the region between the peeling layers 17 .

The release layer 17 is a layer having a low adhesive strength with the substrate 15 . The release layer 17 is formed by printing on the back surface of the base material 15 using an ink containing, for example, a release agent and optionally mixed with a colorant, a resin component, a solvent, or various additives. be done. As release agents, silicones, fluorine compounds, thermoplastic elastomers, long-chain alkyl polymers, waxes, and the like can be used. The thickness of the release layer 17 is, for example, 0.1 μm to 5 μm.

The ink layer 18 is a layer that adheres to each of the base material 15 and the release layer 17 with an adhesive strength stronger than the adhesive strength between the base material 15 and the release layer 17 . The ink layer 18 is formed by solid printing after the release layer 17 is printed. As the ink for the ink layer 18, for example, white ink can be used. In this case, the color of the ink layer 18 becomes white, and the visibility of the authenticity determination layer 12 is improved. As the ink for the ink layer 18, a transparent ink other than white ink may be used. The thickness of the ink layer 18 (thickness in the region between the peeling layers 17) is, for example, 0.2 μm to 5.1 μm.

The pressure-sensitive adhesive layer 19 is a layer that covers the release layer 17 and the ink layer 18 on the back side of the substrate 15 , and is adhered to the adherend 30 when the security seal 10 is adhered to the adherend 30 . The adhesive layer 19 is a translucent layer that is almost colorless. The adhesive layer 19 is formed by applying an adhesive to the ink layer 18 . As the adhesive, an acrylic adhesive having excellent stability such as durability and weather resistance and excellent die-cutting properties can be used. However, other types of adhesives such as rubber-based, urethane-based, or silicone-based adhesives may be used. The thickness of the adhesive layer 19 is, for example, 10 μm to 40 μm. The color of the pressure-sensitive adhesive layer 19 may be transparent, or may be white to improve the visibility of the authenticity determination layer 12 .

The separator 20 is a member that covers the adhesive layer 19 in order to prevent the adhesive layer 19 of the upper seal from sticking to the authentication layer 12 of the lower seal while the security seal 10 is wound. . Release paper, for example, can be used for the separator 20 . As the separator 20, if a separator 20 with heavy release is used, the release layer 17 may be peeled off, resulting in poor character floating. The separator 20 is peeled off when the security seal 10 is attached to the adherend 30 .

The authenticity determination layer 12 is a layer formed with a repeated pattern portion 32 (pattern for authenticity determination) that can be visually recognized as a virtual image 29 (see FIG. 5) through a lens sheet (optical sheet) 25, which will be described later. The authenticity determination layer 12 is formed on the front side of the base material 15 . The authentication layer 12 is formed by high-resolution printing (high-definition printing). The resolution of the authenticity determination layer 12 is, for example, 4000 dpi or more (eg, 4800 dpi). In authenticity determination using the authenticity determination layer 12, the presence or absence of fraud is determined by whether or not the virtual image 29 can be confirmed.

As an example of the authenticity determination layer 12 and the lens sheet 25, for example, the technique described in Patent Document 3 can be adopted. The outline of the technology will be described below.

First, the lens sheet 25 will be explained. The lens sheet 25 is, as shown in FIG. 2(a), a sheet composed of a convex lens assembly 24 in which a plurality of fine convex lenses 27 are assembled. A transparent material (for example, a synthetic resin such as acrylic acid ester-based resin or methyl methacrylate resin) can be used for the convex lens assembly 24 . The focal point of each convex lens 27 is located on the print formation surface of the authenticity determination layer 12 (the front surface of the base material 15) in the usage state in which the lens sheet 25 is placed in contact with the front surface of the security seal 10. FIG. The upper side of the lens sheet 25 is the front side in FIG. 2(a). In the convex lens assembly 24, a large number of convex lenses 27 are arranged so that each pattern unit 31 in the repeated pattern portion 32 can be observed to rise or sink due to the moire effect in the above-described usage state. As the arrangement of the convex lenses 27, as shown in FIG. 2B, a honeycomb arrangement in which one convex lens 27 is provided in each section of a regular hexagon can be adopted. In addition to the honeycomb arrangement, another arrangement such as a matrix arrangement in which one convex lens 27 is provided in each section of a lattice may be employed. For example, a convex lens 27 is arranged in the center of each section.

Next, the authenticity determination layer 12 is composed of a repeated pattern portion 32 printed on the front side of the base material 15 . In the repeated pattern portion 32 , a plurality of pattern units 31 are arranged so that the arrangement interval and arrangement direction of the convex lenses 27 are different. Specifically, in the repeated pattern portion 32, the arrangement intervals of the pattern units 31 are regularly changed so as to satisfy the relationship of Expression 1 when any three adjacent pattern units are selected, and the arrangement of the pattern units 31 It includes a continuously deformed pattern portion whose direction changes regularly so as to satisfy the relationship of Equation (2).
Formula 1: 0.95 ≤ D _{N ~ N + 1} / D _{N + 1 ~ N + 2} ≤ 1.05
Formula 2: -1 ≤ θ ≤ +1

In Equation 1, D _{N to N+1} are the distances between the Nth pattern unit N and its adjacent N+1th pattern unit N+1, and D _{N+1 to N+2} are the distances between the N+1th pattern unit N+1 and its adjacent N+2th pattern unit. , and the pattern unit N+2. In Equation 2, θ is the extension of the straight line connecting the N-th pattern unit N and the adjacent N+1-th pattern unit N+1, and the N+1-th pattern unit N+1 and the adjacent N+2-th pattern unit N+2. is the angle of intersection with the straight line connecting

[How to use security seals and functions to detect fraud]
The method of using the fraud detection sticker set including the security sticker 10 and the lens sheet 25 and the fraud detection function will be described with reference to FIGS.

The security seal 10 is used by being attached to the unsealing portion of the adherend 30, which is an adherend 30 such as a box or an envelope (article container) for packing various articles. After a predetermined period of time (for example, a period of about one day) has elapsed, when the seal support 14 is peeled off from the adherend 30, as shown in FIG. Part) detachment occurs. Then, in a state in which the seal support 14 is peeled off, the pressure-sensitive adhesive layer 19 integrated on the seal support 14 side is exposed. Specifically, in the region where the release layer 17 is formed in plan view, separation occurs at the boundary between the base material 15 and the release layer 17, and in the region between the release layers 17 in plan view, the adhesive layer 19 and the adherend 30 are separated. Delamination occurs at the boundary of In the area where the release layer 17 is formed, the adhesive strength at the boundary between the substrate 15 and the release layer 17 is the lowest among the boundaries between layers adjacent in the thickness direction. In the region between the release layers 17, the adhesive strength of the boundary between the pressure-sensitive adhesive layer 19 and the adherend 30 is the lowest among the boundaries between layers adjacent in the thickness direction.

As a result, as shown in FIG. 4 , the design (for example, “opened” characters) of the part where the release layer 17 is peeled off from the back side of the base material 15 can be visually recognized from the front side of the base material 15 . This design remains on the substrate 15 as a trace of peeling. Therefore, if a falsifier or the like peels off the security seal 10, fraud can be detected.

Here, as described above, there is a case where a person who is not a tamperer wants to return the article container such as a box to the closed state after removing the security seal 10 from the article container and opening the package. For example, for products such as medicines that need to be hygienically managed, the box can be returned to the closed state to prevent dust from entering the box during storage. In addition, when the product after use is put back into the box and discarded, depending on the product, it is necessary to close the box so that it cannot be opened. In such a case, in this embodiment, when the seal support 14 is peeled off from the adherend 30, the pressure-sensitive adhesive layer 19 integrated on the seal support 14 side is exposed. Therefore, the security seal 10 can be attached to the adherend 30 again, and the box can be closed without preparing a separate seal.

Further, in the present embodiment, it is also possible to detect fraudulent activity by performing authenticity determination using the lens sheet 25 . Specifically, in authenticity determination, the inspector places the lens sheet 25 in contact with the front side of the security seal 10 to superimpose them, and views the authenticity determination layer 12 through the lens sheet 25 . In the case of a genuine product provided with a plurality of pattern units 31 so as to satisfy Equations 1 and 2 described above, the inspector sees that the pattern appears or sinks due to slight differences in the position of the pattern entering from the left and right eyes. Since the brain recognizes that it is crowded, a virtual image 29 can be seen (see FIG. 5). On the other hand, if the product is not genuine, the virtual image 29 cannot be seen. Thus, in this embodiment, it is possible to detect fraudulent activity by authenticity determination using the lens sheet 25 . Further, in this embodiment, since two fraud detection means are used, fraud can be effectively prevented.

Further, in this embodiment, the security seal 10 is formed with a high-resolution authenticity determination layer 12 . The authenticity determination layer 12 is printed using a 4800 dpi CTP setter. Only a limited number of companies have CTP setters with this level of high resolution. Therefore, it is difficult for a person who intends to commit fraud to obtain a CTP setter. According to this embodiment, forgery of the security seal 10 can be suppressed.

Further, in this embodiment, since the authentication layer 12 is laminated on the front side of the seal support 14, the seal support 14 protects the authentication layer 12 against the stress applied when the security seal 10 is peeled off. Therefore, even after the security seal 10 is peeled off from the adherend 30, the authenticity determination function of the authenticity determination layer 12 can be maintained. Even if the re-pasting is done as a fraudulent act, the authenticity determination layer 12 can detect the fraudulent act. In addition, even if a fraudulent person peels off the fraud detection sticker 10 and then replaces it with another sticker that has a similar appearance and reattaches it, the authenticity determination function used in the legitimate fraud detection sticker 10 can be used. By confirming the presence or absence of , it is possible to easily confirm whether or not a fraudulent act has been performed, so that fraudulent activity can be detected more accurately.

Note that the security seal 10 according to this embodiment can be used for various purposes for the purpose of preventing fraud. For example, calibrated precision instruments, measuring instruments, and small instruments associated therewith (weights, etc.) can be used as packing boxes and the like. In addition, it can be used as a packaging box for medicines used in the living body, medical instruments that cannot be reused (disposable medical instruments, etc.), and the like. Furthermore, it can be used as a medium for storing confidential data, as well as accessories associated with it (cards for one-time passwords, etc.), chemicals, packaging boxes for dangerous goods, and the like. According to the present embodiment, fraudulent acts can be effectively prevented by being used in the unsealing portion of the packaging of such articles.

[Other embodiments]
In the above-described embodiment, the fraud detection seal 10 is, for example, like the tamper-proof labels described in Patent Documents 1 and 2, so that the adhesive layer 19 does not remain on the adherend 30 after being peeled off from the adherend 30. may be configured. In this case, the adhesive strength Ia between the authentication layer 12 and the seal support 14, the adhesive strength Ib between the seal support 14 and the release layer 17, the adhesive strength I- between the seal support 14 and the ink layer 18 c, adhesive strength Id between release layer 17 and ink layer 18, adhesive strength Ie between ink layer 18 and adhesive layer 19, adhesive strength If between adhesive layer 19 and adherend 30, At least one selected from adhesive strength Ia, adhesive strength Ic, and adhesive strength Ie when expressed as adhesive strength Ig between the adhesive layer 19 and the separator 20 (see FIG. 6) is greater than the adhesive strength If and the force relationship Ig<Ib<If<Id is satisfied.

In the above-described embodiment, the fraud detection seal 10 may be configured in a form different from that shown in FIG. 6 so that the adhesive layer 19 does not remain on the adherend 30 after being peeled off from the adherend 30. . In this case, as shown in FIG. 7A, a cushion layer 21 having cushioning properties and film properties can be interposed between the ink layer 18 and the adhesive layer 19 . FIG. 7(b) shows the fraud detection seal 10 after peeling. With this fraud detection sticker 10 , the entire adhesive layer 19 is peeled off from the adherend 30 when the fraud detection sticker 10 is peeled off after the adhesive layer 19 is attached to the adherend 30 . At this time, the fraud detection seal 10 is curved, and internal peeling X occurs on the front side (boundary portion) of the peeling layer 17 in the region where the peeling layer 17 is formed. Further, when the seal support 14 is peeled off, the adhesive layer 19 integrated on the seal support 14 side is exposed. Instead of providing the cushion layer, the pressure-sensitive adhesive layer 19 itself may have cushioning properties. Further, the internal peeling X may occur on the back side of the peeling layer 17 or inside the peeling layer 17 .

In the above-described embodiment, the fraud detection seal 10 may be configured such that the pressure-sensitive adhesive layer 19 integrated with the adherend 30 is exposed when the seal support 14 is peeled off.

Further, in the above-described embodiment, peeling may occur inside the adhesive layer 19 when the fraud detection seal 10 is peeled off. In this case, when the seal support 14 is peeled off, the adhesive layer 19 integrated on the seal support 14 side is exposed, and the adhesive layer 19 integrated on the adherend 30 side is also exposed. .

In the above-described embodiment, when the fraud detection seal 10 is peeled off after the adhesive layer 19 is attached to the adherend 30, peeling occurs on the back side (border) of the peeling layer 17 in the region where the peeling layer 17 is formed. Alternatively, the fraud detection sticker 10 may be configured such that peeling occurs inside the peeling layer 17 (an intermediate portion in the thickness direction).

Further, in the above-described embodiment, the fraud detection sticker 10 may be formed in the form of a label having a predetermined shape instead of the tape form.

Further, in the above-described embodiment, the fraud detection sticker 10 may further include a protective layer that covers the front side of the authenticity determination layer 12 . Silicone or the like can be used as the material of the protective layer. In this case, the separator 20 may be omitted.

Further, in the above-described embodiment, as the pattern for authenticity determination in the authenticity determination layer 12, a pattern that can be converted into electronic information by being read by an imaging device such as a camera may be printed. As this pattern, for example, a barcode such as a QR code (registered trademark) can be adopted. The fraud detection seal 10 includes a seal support 14 and an authenticity determination layer 12 having the pattern.

Further, in the above-described embodiment, as a pattern for authenticity determination in the authentication layer 12, the lens sheet 25 is brought into contact with the front side of the security seal 10 and superimposed thereon, and when the authenticity determination layer 12 is visually observed through the lens sheet 25, Alternatively, by rotating the lens sheet 25 while it is in contact with the lens sheet 25, a pattern that emerges at a specific rotation angle may look different from that at another angle.

In the above-described embodiment, ink that glows in the dark (such as ink containing fluorescent paint) may be used for printing the authentication layer 12 .

Further, in the above-described embodiment, the authenticity determination layer 12 may adopt other forms such as the pointillist drawing pattern described in Patent Document 4, for example.

INDUSTRIAL APPLICABILITY The present invention can be applied to a fraud detection sticker or the like for detecting the presence or absence of fraud such as falsification.

10 Security seal (fraud detection seal)
REFERENCE SIGNS LIST 12 Authenticity determination layer 14 Seal support 15 Substrate 17 Release layer 18 Ink layer 19 Adhesive layer

Claims (6)

a seal support having a substrate;
an authenticity determination layer laminated on the front side of the seal support and having a pattern for authenticity determination formed thereon;
a release layer partially laminated to the back side of the seal support;
an ink layer (excluding a colored layer containing an adhesive) laminated directly on the seal support and the release layer so as to fill the area between the release layers on the back side of the seal support;
A pressure-sensitive adhesive layer covering the release layer and the ink layer on the back side of the seal support,
When the seal support is peeled off after the pressure-sensitive adhesive layer is attached to the adherend, peeling occurs at the boundary or inside the peeling layer in the peeling layer formation region,
By exposing the pressure-sensitive adhesive layer integrated on the seal support side or the adherend side in a state where the seal support is peeled off , re-sticking to the adherend is facilitated by the exposed pressure-sensitive adhesive layer. Possible , fraud detection seal. 2. The fraud detection seal according to claim 1, wherein said authenticity determination layer comprises a printed layer on which said pattern for authenticity determination is formed with ink. 3. The fraud detection seal according to claim 2, wherein the print layer has a resolution of 4000 dpi or more. When the seal support is peeled off after the pressure-sensitive adhesive layer has been attached to the adherend, peeling occurs at the boundary between the seal support and the release layer in the release layer forming region, resulting in a region between the release layers. The fraud detection sticker according to any one of claims 1 to 3, wherein delamination occurs at a boundary portion between the adhesive layer and the adherend. The fraud detection seal according to any one of claims 1 to 4, wherein the ink layer has a white color. A fraud detection seal according to any one of claims 1 to 5;
and an optical sheet used for authenticity determination using the authenticity determination layer.

Images