JP2020003573A - Illicit detection seal and illicit detection seal set - Google Patents

Abstract

To configure to enable re-adhering after peeled off from an adhered body in an illicit detection seal having a plurality of illicit detection technologies used.SOLUTION: An illicit detection seal 10 comprises: a seal supporting body 14 that has a base material 15; an authenticity determination layer 12 that is laminated on a front side of the seal supporting body 14, and has an authenticity determination-purpose pattern formed; a peel-off layer 17 that is partially laminated on a rear side of the seal supporting body 14; an ink layer 18 that is laminated so as to embed an area between the peel-off layers 17 on the rear side of the seal supporting body 14; and an adhesive layer 19 that coats the peel-off layer 17 and the ink layer 18 on the rear side of the seal supporting body 14. When peeling off the seal supporting body 14 after the adhesive layer 19 is adhered to an adhered body 30, peeling off occurs in a boundary part of the peel-off layer 17 or in an interior thereof in a formation area of the peel-off layer 17, and the adhesive layer 19 unified on a seal supporting 14 side or an adhered body 30 side is exposed in a state where the seal supporting body 14 is peeled off.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a fraud detection seal for detecting the presence or absence of fraud such as tampering.

  In recent years, the distribution of counterfeit products has been expanding internationally. The imitation means is classified into fraudulent activities such as copying of a product, alteration or falsification of attribute information relating to a product, and illegal reuse of a container. As a fraud detection technology / product for detecting the presence or absence of such fraud, security interference (for example, Patent Documents 1 and 2) in which designs such as characters and designs appear as traces of peeling, and light interference from holograms and the like. Utilized authenticity determination techniques (for example, Patent Documents 3 and 4) are known.

  It is also considered to combine a plurality of fraud detection technologies. Patent Document 5 discloses a security label combining a plurality of fraud detection techniques. This security label has a) a support substrate, b) a reflective layer or a layer having a high refractive index, c) a partially release paint layer, d) a full-surface adhesive coating, and an adhesion medium between the layers c) and d). The layers are located. Also, between layer a) and layer b), one or more further layers having optical, optically active, diffraction, electrical and / or magnetic properties can be located. . If this label is peeled and attempted to be tampered with, the adhesion mediating layer will break the adhesion of layer b) to support substrate a) at the location where partial release coating layer c) is not present, and the partial release coating layer c The layer b) is separated from the support substrate a) in the region where no) is present. Also, after an attempted tampering of the label, not only the torn surface, but also the portion of the label remaining on the object to be secured is dried and becomes non-adhesive.

JP 2003-316271 A JP 2003-345255 A Japanese Patent No. 4885101 Japanese Patent No. 3338860 Japanese Patent No. 5492292

  By the way, a fraud detection seal using a plurality of fraud detection technologies is effective in preventing fraud because a person who intends to fraud needs to cope with each fraud detection technology. However, this kind of conventional fraud detection seal (the label described in Patent Literature 5) is not adhesive when peeled off, and therefore cannot be re-attached to an article container such as a box. Is not very convenient for For example, a legitimate user may want to remove the fraud detection seal from the article container, check the article in the article container, and then return the article to the article container without using it immediately and manage it. In such a case, a separate seal is required to return the article container to the closed state in order to appropriately manage the articles such as preventing dust from entering the article container.

  The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a fraud detection seal using a plurality of fraud detection techniques, which can be re-attached after being peeled off from an adherend. I do.

  In order to solve the above-mentioned problems, a first invention is directed to a seal support having a base material, an authenticity determination layer laminated on a front side of the seal support and having an authenticity determination pattern formed thereon, and a seal support. A release layer partially laminated on the back side, an ink layer laminated on the back side of the seal support so as to fill an area between the release layers, and an adhesive layer covering the release layer and the ink layer on the back side of the seal support When peeling the seal support after attaching the pressure-sensitive adhesive layer to the adherend, peeling occurs at the boundary or inside of the release layer in the release layer forming area, and in a state where the seal support is peeled off This is a fraudulent detection seal in which the pressure-sensitive adhesive layer integrated on the seal support side or the adherend side is exposed.

  In a second aspect based on the first aspect, the authenticity determining layer is constituted by a printed layer on which an authenticity determining pattern is formed by ink.

  In a third aspect based on the second aspect, the resolution of the printing layer is 4000 dpi or more.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, when the seal support is peeled off after the pressure-sensitive adhesive layer is attached to the adherend, the seal support and the release layer are formed in an area where the release layer is formed. At the boundary between the adhesive layer and the adhesive layer and the adherend in the region between the release layers.

  In a fifth aspect based on any one of the first to fourth aspects, the color of the ink layer is white.

  A sixth invention is a fraud detection seal set including any one of the first to fifth fraud detection seals and an optical sheet used for authenticity judgment using an authenticity judgment layer.

  In the present invention, the pressure-sensitive adhesive layer integrated on the seal support side or the adherend side is exposed in a state where the seal support (the fraud detection seal) is peeled off from the adherend. Therefore, the fraud detection seal can be attached again to the adherend.

  Further, in the present invention, when the fraud detection seal is peeled off from the adherend, peeling occurs at a boundary portion or inside the peeling layer in a region where the peeling layer is formed. Therefore, when the tamperer peels off the fraud detection seal, a trace remains in the area where the peeling layer is formed, so that fraudulent activity can be detected. In addition, fraudulent activity can be detected by using the authenticity determination layer. In the present invention, since at least two fraud detection techniques are used, fraudulent acts can be effectively prevented.

  Further, in the present invention, the authenticity determination layer is laminated on the front side of the seal support. Here, when the fraud detection seal is peeled off, the stress acting on the front side differs between the region where the peeling layer is easily peeled and the other region (the region between the peeling 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. . On the other hand, in the present invention, the authenticity determination layer is protected by the seal support 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 seal is peeled off.

  Further, in the present invention, in consideration of the convenience of a regular user, it is possible to re-attach after detaching from the adherend. Here, from the viewpoint of preventing fraud, a configuration that cannot be re-attached after being peeled off, such as a security label described in Patent Document 5, is effective. On the other hand, in the present invention, since the fraudulent act can be detected even if the sticker is re-attached after the fraud detection seal is peeled off, the fraudulent act can be sufficiently prevented even with the re-attachment configuration. In addition, it can be sufficiently assumed that a person who commits a fraud removes the fraud detection seal and then replaces it with another seal having a similar appearance and re-attaches the sticker. Even in such a case, by confirming whether or not the authenticity determination function used for the legitimate fraud detection seal is used, it is possible to easily confirm whether or not fraud has been performed. Is possible.

  In the third invention, the resolution of the print layer is 4000 dpi or more. Only a limited number of companies have CTP (Computer To Plate) setters necessary to obtain this level of resolution, and it is difficult for those who intend to commit fraud to obtain CTP setters. According to the third invention, forgery of the fraud detection seal can be suppressed.

  In the fifth aspect, 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 illustrating a cross-sectional structure of the security seal according to the present embodiment. FIG. 2A is a schematic diagram showing a cross-sectional structure of each of an authentication layer and a lens sheet of a security seal, and FIG. 2B is an enlarged plan view showing a part of a lens assembly in the lens sheet. It is. FIG. 3 is a schematic view showing a cross-sectional structure in a state where the security seal is peeled off from the adherend. FIG. 4 is a schematic view of the base material after the security seal has been peeled off from the adherend as viewed from the front side. FIG. 5 is a schematic diagram for explaining a virtual image seen at the time of authenticity determination. FIG. 6 is a schematic diagram illustrating a cross-sectional structure of a security seal according to another embodiment. FIG. 7A is a schematic view illustrating a cross-sectional structure of a security seal according to another embodiment before peeling of a tape different from that of FIG. 6, and FIG. It is the schematic which shows a cross-section structure.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIGS. The following embodiment is an example of the present invention, and is not intended to limit the scope of the present invention, its application, or its use.

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

  The seal support 14 is formed of a strip-shaped and long base material 15. As the base material 15, a transparent or translucent film is used. The thickness of the base material 15 is 20 μm or more and 80 μm or less (for example, 38 μm), and preferably 30 μm or more and 50 μm or less. Note that the seal support 14 may be constituted by only one base material 15 or may be constituted by a plurality of integrated base materials 15. In addition, the seal support 14 may further include a layer (for example, an undercoat layer) integrated on the front surface or the back surface of the base material 15.

  As a material of the base material 15, 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 a polystyrene resin can be used. Specifically, a polyethylene terephthalate (PET) film, a biaxially oriented polypropylene (OPP) film, or the like can be used for the base material 15.

  When the security seal 10 is peeled off from the adherend 30, the peeling structure 16 causes a predetermined design (a design such as a character, a design, or a pattern) to appear as a trace of the peeling. The peeling structure 16 is formed by laminating the peeling layer 17 partially laminated on the back side of the base material 15 (seal support 14) with a predetermined design and filling the area between the peeling layers 17 on the back side of the base material 15. Ink layer 18 provided. The release layer 17 is in contact with the back surface of the substrate 15. Further, the ink layer 18 covers not only the region between the release layers 17 but also the region where the release layer 17 is formed. The ink layer 18 contacts the back surface of the base material 15 in a region between the release layers 17, and contacts the release layer 17 in a region where the release layer 17 is formed. The ink layer 18 may be provided only in the region between the release layers 17.

  The release layer 17 is a layer having low adhesive strength to the base material 15. The release layer 17 is formed by printing on the back surface of the base material 15 using, for example, an ink containing a release agent and, if necessary, a colorant, a resin component, a solvent or various additives mixed and adjusted. Is done. As the release agent, silicone, a fluorine compound, a thermoplastic elastomer, a long-chain alkyl-based polymer, a wax, or 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 higher than the adhesive strength between the base material 15 and the release layer 17. The ink layer 18 is formed by performing solid printing after the release layer 17 is printed. As the ink of the ink layer 18, for example, a white ink can be used. In this case, the color of the ink layer 18 is white, and the visibility of the authenticity determination layer 12 is improved. The ink of the ink layer 18 may be other than white, such as transparent ink. The thickness of the ink layer 18 (the thickness in the region between the release 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 base material 15 and is adhered to the adherend 30 when the security seal 10 is attached to the adherend 30. The pressure-sensitive adhesive layer 19 has almost no color and is a translucent layer. The pressure-sensitive adhesive layer 19 is formed by applying a pressure-sensitive adhesive to the ink layer 18. As the pressure-sensitive adhesive, an acrylic pressure-sensitive adhesive excellent in stability such as durability and weather resistance and die-cutting property can be used. However, other types of pressure-sensitive adhesives such as rubber-based, urethane-based, and silicone-based adhesives may be used. The thickness of the pressure-sensitive 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 in order to improve the visibility of the authenticity determination layer 12.

  The separator 20 is a member that covers the pressure-sensitive adhesive layer 19 in order to prevent the pressure-sensitive adhesive layer 19 of the upper seal from being stuck to the authenticity determination layer 12 of the lower seal while the security seal 10 is wound. . For the separator 20, for example, release paper can be used. As the separator 20, when a heavy-peeling separator is used, the peeling layer 17 may be peeled off and a character floating defect may occur. Therefore, a light-peeling separator that is peeled off with a relatively light force is used. 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 in which a repetitive pattern portion 32 (a pattern for authenticity determination) that can be visually recognized as a virtual image 29 (see FIG. 5) through a lens sheet (optical sheet) 25 described later. The authenticity determination layer 12 is formed on the front side of the base material 15. The authenticity determination layer 12 is formed by performing high-resolution printing (high-definition printing). The resolution of the authenticity determination layer 12 is, for example, 4000 dpi or more (for example, 4800 dpi). In the 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, a technique described in Patent Document 3 can be adopted. Hereinafter, an outline of the technology will be described.

  First, the lens sheet 25 will be described. As shown in FIG. 2A, the lens sheet 25 is a sheet constituted by a convex lens assembly 24 in which a plurality of fine convex lenses 27 are assembled. For the convex lens assembly 24, a transparent material (for example, a synthetic resin such as an acrylate resin or a methyl methacrylate resin) can be used. The focal point of each convex lens 27 is located on the print forming surface (the front surface of the base material 15) of the authenticity determination layer 12 in a state where the lens sheet 25 is in contact with and superimposed on the front surface of the security seal 10. The upper side of the lens sheet 25 in FIG. In the convex lens assembly 24, a large number of convex lenses 27 are arranged so that each pattern unit 31 in the repetitive pattern portion 32 rises or sinks and is observed by the moire effect in the use state described above. As an 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. Note that, other than the honeycomb arrangement, another arrangement such as a matrix arrangement in which one convex lens 27 is provided in each section of the lattice may be adopted. For example, the convex lens 27 is arranged at the center of each section.

Subsequently, the authenticity determination layer 12 is composed of a repeating pattern portion 32 printed on the front side of the base material 15. The repetitive pattern portion 32 is arranged such that the plurality of pattern units 31 are different from the arrangement interval and the arrangement direction of the convex lenses 27. Specifically, the repeating pattern unit 32 regularly changes the arrangement interval of the pattern units 31 so as to satisfy the relationship of Expression 1 when three arbitrary adjacent pattern units are selected. The direction includes a continuously deformed pattern portion that changes regularly so as to satisfy the relationship of Expression 2.
Formula 1: 0.95 ≦ D _{N to N + 1} / D _{N + 1 to N + 2} ≦ 1.05
Formula 2: −1 ≦ θ ≦ + 1

In Equation 1, _{DN to} N + 1 are the intervals between the Nth pattern unit N and the (N + 1) th pattern unit N + 1 adjacent thereto, and DN + 1 to _{N + 2} are the (N + 1) th pattern unit N + 1 and the (N + 2) th adjacent pattern unit. Of the pattern unit N + 2. In Equation 2, θ is an extension of a straight line connecting the Nth pattern unit N and its adjacent (N + 1) th pattern unit N + 1, the (N + 1) th pattern unit N + 1 and its (N + 2) th pattern unit N + 2 Is the angle of intersection with the straight line connecting

[How to use security seals and fraud detection function, etc.]
With reference to FIGS. 3 to 5, a method of using the fraud detection seal set including the security seal 10 and the lens sheet 25 and a fraud detection function will be described.

  The security seal 10 is used by attaching a box or an envelope (article container) for packing various articles as an adherend 30 to an opening portion of the adherend 30. When the seal support 14 is peeled off from the adherend 30 after a predetermined period (for example, a period of about one day) has elapsed, as shown in FIG. Part). Then, with the seal support 14 peeled off, the pressure-sensitive adhesive layer 19 integrated on the seal support 14 side is exposed. Specifically, peeling occurs at the boundary between the base material 15 and the peeling layer 17 in a region where the peeling layer 17 is formed in plan view, and the pressure-sensitive adhesive layer 19 and the adherend 30 are formed in a region between the peeling layers 17 in plan view. Peels off at the boundary of. In the region where the peeling layer 17 is formed, the bonding strength at the boundary between the base material 15 and the peeling layer 17 is the smallest among the boundaries between the layers adjacent in the thickness direction. In the region between the peeling layers 17, the bonding strength between the adhesive layer 19 and the adherend 30 at the boundary between the layers adjacent in the thickness direction is the smallest.

  As a result, as shown in FIG. 4, the design of the portion where the release layer 17 has been peeled from the back side of the base material 15 (for example, the letters “opened”) can be visually recognized from the front side of the base material 15. This design remains on the substrate 15 as a trace of delamination. Therefore, when a tamper or the like peels off the security seal 10, it is possible to detect fraudulent acts.

  Here, as described above, there is a case where a person who is not a falsifier wants to return the article container to a closed state again after peeling off the security seal 10 from the article container such as a box and opening it. For example, for a product such as a pharmaceutical product that is to be hygienically managed, dust can be prevented from entering the box during storage by returning the box to a closed state. In addition, when the used product is returned to the box and discarded, it is necessary to close the box so that the product does not open depending on the product. In such a case, in this embodiment, the pressure-sensitive adhesive layer 19 integrated with the seal support 14 is exposed in a state where the seal support 14 is peeled off from the adherend 30. Therefore, the security seal 10 can be attached again to the adherend 30, and the box can be closed without separately preparing a seal.

  Further, in the present embodiment, fraudulent activity can be detected also by performing authenticity determination using the lens sheet 25. Specifically, in the authenticity judgment, the inspector superimposes the lens sheet 25 on the front side of the security seal 10 and abuts the lens sheet 25 to visually check the authenticity judgment layer 12. In the case of a genuine product provided with a plurality of pattern units 31 so as to satisfy Expressions 1 and 2 described above, the examiner may notice that the design emerges or sinks due to the slightly different positions of the design from the left and right eyes. Since the brain recognizes that it is embedded, a virtual image 29 can be seen (see FIG. 5). On the other hand, if it is not a regular product, the virtual image 29 cannot be seen. As described above, in the present embodiment, fraudulent activity can be detected by authenticity determination using the lens sheet 25. And in this embodiment, since two fraud detecting means are used, fraudulent acts can be effectively prevented.

  In the present embodiment, the security seal 10 is provided with a high-resolution authenticity determination layer 12. The authenticity determination layer 12 is printed using a 4800 dpi CTP setter. This level of high-resolution CTP setter is only owned by a limited number of companies. Therefore, it is difficult for a person who intends to cheat to obtain a CTP setter. According to the present embodiment, forgery of the security seal 10 can be suppressed.

  Further, in the present embodiment, since the authenticity determination layer 12 is laminated on the front side of the seal support 14, the authentication support layer 12 is protected by the seal support 14 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 authentication function of the authentication layer 12 can be maintained. Then, even if reattachment is performed as a fraudulent act, the authenticity determination layer 12 can detect the fraudulent act. In addition, even if a person who commits a fraud removes the fraudulent detection seal 10 and then replaces it with another seal having a similar appearance and reattaches it, the authenticity judgment function used for the legitimate fraudulent detection seal 10 is used. By confirming the presence or absence of fraud, it is possible to easily confirm whether or not fraud has been performed, so that fraudulent activity can be detected more accurately.

  Note that the security seal 10 according to the present embodiment can be used for various purposes for the purpose of preventing fraud. For example, calibrated precision instruments, measuring instruments, and accessory instruments (such as weights) attached to them can be used for packaging boxes and the like. Further, it can be used for a packaging box of a medicine used for a living body, a medical device that cannot be reused (eg, a disposable medical device). Furthermore, it can be used as a medium for storing confidential data, accessories (such as a one-time password card), chemicals, and dangerous goods packaging boxes. According to the present embodiment, fraudulent acts can be effectively prevented by being used in the opening portion of such a package of articles.

[Other embodiments]
In the above-described embodiment, the fraud detection seal 10 is configured such that the adhesive layer 19 does not remain on the adherend 30 after being peeled off from the adherend 30 as in the tamper-proof labels described in Patent Documents 1 and 2, for example. It may be configured. In this case, the adhesive strength Ia between the authenticity determination layer 12 and the seal support 14, the adhesive strength Ib between the seal support 14 and the release layer 17, and the adhesive strength I− between the seal support 14 and the ink layer 18. c, adhesive strength Id between the release layer 17 and the ink layer 18, adhesive strength Ie between the ink layer 18 and the adhesive layer 19, adhesive strength If between the adhesive layer 19 and the adherend 30, When the adhesive strength between the pressure-sensitive adhesive layer 19 and the separator 20 is expressed as Ig (see FIG. 6), at least one selected from the adhesive strength Ia, the adhesive strength Ic, and the adhesive strength Ie Can be formed so as to be larger than the adhesive strength If and satisfy the force relationship of Ig <Ib <If <Id.

  In the above-described embodiment, the fraud detection seal 10 may be configured in a different form from 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 a cushioning property and a film property can be interposed between the ink layer 18 and the adhesive layer 19. FIG. 7B shows the fraud detection seal 10 after peeling. When the fraud detection seal 10 is peeled off after the adhesive layer 19 is attached to the adherend 30, the entire adhesive layer 19 is peeled off from the adherend 30. At this time, since the fraud detection seal 10 is curved, 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. When the seal support 14 is peeled off, the integrated pressure-sensitive adhesive layer 19 is exposed on the seal support 14 side. Instead of providing a 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 may occur 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 in a state where the seal support 14 is peeled off.

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

  Further, in the above-described embodiment, when the fraud detection seal 10 is peeled off after the pressure-sensitive adhesive layer 19 is attached to the adherend 30, peeling occurs on the back side (boundary portion) of the peeling layer 17 in the formation region of the peeling layer 17. The fraudulent detection seal 10 may be configured as described above, or the fraudulent detection seal 10 may be configured so that peeling occurs inside the peeling layer 17 (an intermediate portion in the thickness direction).

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

  Further, in the above-described embodiment, the fraud detection seal 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.

  In the above-described embodiment, a pattern that can be converted into electronic information by being read by an imaging device such as a camera may be printed as a pattern for authenticity determination in the authenticity determination layer 12. As this pattern, for example, a bar code 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, when the lens sheet 25 is brought into contact with the front side of the security seal 10 and is superimposed as an authentication pattern on the authentication layer 12, and the authentication layer 12 is visually observed through the lens sheet 25. By shifting the lens sheet 25 so that the lens sheet 25 rotates while being in contact with the lens sheet 25, a pattern that appears at a specific rotation angle and looks different from other angles may be printed.

  In the above-described embodiment, an ink that shines in a dark place (such as an ink containing a fluorescent paint) may be used as the ink used to print the authenticity determination layer 12.

  Further, in the above-described embodiment, the authenticity determination layer 12 may adopt another form such as a point drawing pattern described in Patent Document 4, for example.

  INDUSTRIAL APPLICABILITY The present invention is applicable to a fraud detection seal for detecting the presence or absence of fraudulent acts such as falsification.

10. Security seal (fraud detection seal)
12 authenticity determination layer 14 seal support 15 base material 17 release layer 18 ink layer 19 adhesive layer

Claims (6)

A seal support having a substrate,
Laminated on the front side of the seal support, an authenticity determination layer formed with a pattern for authenticity determination,
A release layer partially laminated on the back side of the seal support,
An ink layer laminated to fill the area between the release layers on the back side of the seal support,
An adhesive layer covering the release layer and the ink layer on the back side of the seal support,
When peeling the seal support after attaching the pressure-sensitive adhesive layer to the adherend, peeling occurs at the boundary portion or inside the peeling layer in the formation region of the peeling layer,
A fraud detection seal, wherein the pressure-sensitive adhesive layer integrated on the seal support side or the adherend side is exposed in a state where the seal support is peeled off.   The fraud detection seal according to claim 1, wherein the authenticity determination layer is configured by a printing layer on which the authenticity determination pattern is formed by ink.   The fraudulent seal according to claim 2, wherein the resolution of the print layer is 4000 dpi or more.   When the seal support is peeled off after attaching the pressure-sensitive adhesive layer to the adherend, peeling occurs at a boundary portion between the seal support and the peel layer in a region where the peel layer is formed, and a region between the peel layers is formed. The fraudulent detection seal according to claim 1, wherein peeling occurs at a boundary between the pressure-sensitive adhesive layer and the adherend.   The fraudulent detection seal according to any one of claims 1 to 4, wherein the color of the ink layer is white. A fraud detection seal according to any one of claims 1 to 5,
A fraud detection seal set, comprising: an optical sheet used for authenticity judgment using the authenticity judgment layer.

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