JP2010058322A - Falsification prevention sheet, and method of determining illegal browsing of concealed postcard using falsification prevention sheet - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide: a falsification prevention sheet capable of determining whether concealed information written by an information transmitting side is browsed illegally or not before an information confirming side checks its content; a concealed postcard using the falsification prevention sheet; and a method of determining illegal browsing of the concealed postcard. <P>SOLUTION: The falsification prevention sheet is formed by laminating a resin transfer layer for preventing information falsification, and an adhesive layer, sequentially, on a separation base material. The resin transfer layer to be transferred onto a transfer-receiving face together with the adhesive layer gets to incomplete transfer in a low-transfer pressure area pressed by a force of degree for bonding the adhesive layer with the transfer-receiving face, and gets to complete transfer in a high-transfer pressure area pressed by a force exceeding the low-transfer pressure. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a falsification preventing sheet for preventing falsification of confidential information entered in a document or a postcard, a concealing postcard using the falsification preventing sheet, and a method for determining fraudulent viewing of the concealing postcard. .

  In recent years, with the improvement of protection awareness for personal information, many people are hesitant to enter confidential information on documents and postcards. For this reason, many concealment labels are used to protect the entered confidential information. Such a concealment label is intended to prevent tampering such as secondary entry by a malicious third party and fraud of information, which can occur before a valid recipient removes the concealment label and confirms the information. Various ideas have been made.

For example, Patent Document 1 discloses concealing postcards in which concealment labels having transparent tack paper are connected. According to this, by attaching a concealment label to the information entry field in which information is entered, not only can such information be concealed, but also the material of the concealment layer constituting the concealment label can be selected, or the information entry field Secondary entry can be prevented by concealing other parts by an opaque concealing layer.
JP 2006-330218 A

  However, in order to protect personal information from malicious acts such as diversion and sales that are increasing year by year, the current protection is not sufficient, and further security improvement is required.

  The present invention has been made in view of the above problems, and its purpose is to determine whether or not the confidential information entered on the information transmission side has been illegally browsed before confirming the content on the information confirmation side. The present invention provides a tamper-proof sheet that can be used, and provides a concealing postcard using the tamper-proof sheet and a method for judging illegal browsing of the concealed postcard.

  As a result of earnest research to solve the above problems, the present inventor used a brittle resin as the material of the resin transfer layer forming the falsification preventing sheet, and applied a certain pressure to the falsification preventing sheet, thereby preventing unauthorized viewing. The inventors have found that the presence or absence can be determined, and have completed the present invention.

  More specifically, the present invention provides the following.

In the falsification preventing sheet of the present invention, a resin transfer layer for preventing information falsification and an adhesive layer are sequentially formed on the release substrate, and the resin transfer layer transferred to the transfer surface together with the adhesive layer is: It is characterized by incomplete transfer in a low transfer pressure region pressed with a force sufficient to bond the adhesive layer and the transfer surface, and complete transfer in a high transfer pressure region pressed with a force exceeding it. To do. Here, the pressure applied to the high transfer pressure region is preferably 3.0 kg / cm ² or more, and the coating amount of the resin forming the resin transfer layer is preferably 5 to 40 g / m ² , The application amount of the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is preferably 5 to 100 g / m ² . Further, it is preferable that the resin transfer layer is subjected to a process in which the transfer region can be visually discerned with respect to the transfer surface.

  The concealed postcard of the present invention is provided with a concealment information entry field for entering concealment information, and a postcard body unit, which is connected to the postcard body unit with a fold line interposed therebetween. It comprises a concealable concealing part, wherein the falsification preventing sheet is used as the concealing part, and the peeling substrate is a concealing substrate.

The method for judging unauthorized browsing according to the present invention is a method for judging the presence or absence of unauthorized viewing based on the transfer rate of the resin transfer layer using the concealed postcard, wherein the confidential information is entered on the information transmission side. Then, after covering the concealment information by the concealment unit, the resin transfer layer is imperfectly transferred by pressing with a force that allows the adhesive layer and the transfer target surface to adhere to each other. The concealed postcard after the incomplete transfer is further transferred by pressing the resin transfer layer with a force exceeding the concealed postcard, and the concealed postcard of the incomplete transfer is performed with the presence of the postcard. And In the method of determining unauthorized browsing according to the present invention, it is preferable that the complete transfer is mechanically performed at a pressure of 3.0 kg / cm ² or more.

  According to the present invention, the resin transfer layer that forms the tamper-proof sheet is imperfectly transferred in a region pressed with a force sufficient to bond the adhesive layer and the transfer surface, and pressed with a force exceeding that. Since it is completely transferred in the area, it is stipulated that the information confirmation side presses the sheet with a certain force before confirming the information, so that the malicious third party is transferred to the confidential information entry field before that. If the resin transfer layer is peeled off, the transfer becomes incomplete, so that it is possible to determine whether there is unauthorized browsing. Further, according to the present invention, since the surface of the resin transfer layer has a fine unevenness due to the weakness of the resin, when a malicious third party falsifies the confidential information in the entry field, The presence / absence of secondary entry can also be determined based on the ink texture or the like.

  Hereinafter, preferred embodiments of a falsification preventing sheet, a concealing postcard using the falsification preventing sheet, and a method for judging unauthorized browsing of the concealing postcard of the present invention will be described with reference to the drawings (FIGS. 1 to 5). Each figure shown below including FIG. 1 is a schematic diagram, and the size and shape of each part are appropriately exaggerated for easy understanding.

  Here, FIG. 1 is a diagram illustrating a concealment postcard which is an embodiment of the falsification preventing sheet of the present invention, and FIG. 2 is a diagram sequentially illustrating one usage method of the information transmission side of the concealment postcard illustrated in FIG. 3 is a diagram sequentially illustrating one method of use of the information confirmation side (authorized person) of the concealed postcard shown in FIG. 1, and FIG. 4 is a diagram of the information confirming side (malicious person) of the concealed postcard shown in FIG. FIG. 5 is a schematic plan view showing the back side of the concealed postcard shown in FIG. 1 after confirmation of information.

First, the concealment postcard 10 which is one embodiment of the falsification preventing sheet of the present invention will be described in detail.
FIG. 1 is a view showing a concealing postcard which is an embodiment of the falsification preventing sheet of the present invention. FIG. 1A is a plan view of the concealing postcard 10 viewed from the front side (address side), and FIG. 1B is a plan view of the concealing postcard 10 viewed from the back side. FIG.1 (c) is sectional drawing cut | disconnected along arrow AA shown in FIG.1 (b). In order to facilitate understanding, in FIGS. 1A and 1B, the short side direction of the postcard body 11 is shown as an arrow X direction, and the long side direction is shown as an arrow Y direction.
The concealment postcard 10 which is one embodiment of the tamper-proof sheet of the present invention is a rectangular sheet-like member having a postcard body portion 11 and a concealment portion 12. As the concealing unit 12, the tamper-proof sheet according to one embodiment of the present invention is used.

The postcard main body 11 is a substantially rectangular portion used as a postcard. As shown in FIG. 1A, the front surface 11a has an address field, a stamp field, and the like, and the back surface 11b has information. It has a secret information entry field 111 that can be entered. The postcard main body 11 is made of paper such as high-quality paper.
The postcard body portion 11 is provided with a concealing portion 12 (concealing base material 13), which will be described later, connected through a perforation m serving as a fold line.
The secret information entry field 111 is a writing or printing area provided on at least a part of the back surface 11b of the postcard body 11, and is an area in which information can be written by a writing tool such as a pencil or a ballpoint pen or printing. In the present embodiment, the secret information entry field 111 is formed in a region close to the concealment portion 12 on the back surface 11 b of the postcard body portion 11.
Also, in the confidential information entry field 111, information to be concealed from a third party, for example, if this concealed postcard 10 is used when applying for mail order etc., it is a purchase applicant. Personal information such as the address and name of the sender, information on the number of the application product and payment method (bank account number, credit card number, etc.) can be entered.

The concealing unit 12 includes a concealing base material 13, a release layer 14 laminated on the concealing base material 13, a resin transfer layer 15, an adhesive layer 16, and a release sheet 17.
The concealment base material 13 is a member that serves as a base material for the concealment portion 12, and is continuously provided in the extending direction of the long side of the postcard main body portion 11 via the perforation m that becomes a fold line. And the same quality paper. This concealment base 13 sufficiently conceals information entered by covering substantially the entire area of the concealment information entry field 111 when it is folded along the perforation m so as to overlap the back surface 11b of the postcard body 11. It has a size that can be.
As shown in FIG. 1C, the concealment base 13 is a surface (back surface) that is in the same plane as the concealment information entry column 111 in a state before use (the concealment postcard 10 is not folded along the perforation m). ) A release layer 14, a resin transfer layer 15, an adhesive layer 16, and a release sheet 17 are laminated on 13b.

The concealment base material 13 of this embodiment is substantially rectangular, the dimension in the X direction shown in FIG. 1 is equal to the dimension of the short side of the postcard main body, and the dimension in the Y direction is the Y direction in the secret information entry column 111. It was made larger than the dimension in
Further, the concealment base material 13 of the present embodiment prints a tint block pattern or the like on its surface 13a in order to prevent the information in the concealment information entry column 111 from being visible when the concealment postcard 10 is watermarked on a light source or the like. Has been.

The release layer 14 is a layer formed on the back surface 13 b of the concealing base material 13, and is a layer having peelability that allows the concealing portion 12 (the concealing base material 13) to be peeled from the postcard body portion 11.
The release layer 14 is formed by printing an acrylic or silicone resin on the back surface 13 b of the concealing base material 13. The release layer 14 of this embodiment is formed of a silicone resin.

The resin transfer layer 15 is formed by printing an ultraviolet curable resin (ultraviolet curable ink) on the release layer 14 (on the opposite side of the release layer 14 from the concealing base material 13).
The resin transfer layer 15 of the present embodiment is a transparent or translucent layer. The resin transfer layer 15 formed of such a resin has such a degree of vulnerability that it cannot be substantially peeled off from the postcard body 11 when transferred together with the adhesive layer 16 to the secret information entry column 111 side.

The resin transfer layer 15 of the present embodiment is formed by printing a medium ink, the coating amount is 10 g / m ² , and the thickness of the layer is about 10 μm.
The coating amount of the resin forming the resin transfer layer 15 is preferably ^{5~40g / m 2, 5~20g / m} 2 is more preferable. The thickness of the resin transfer layer 15 is preferably 5 to 40 μm. If the amount of resin applied to form the resin transfer layer 15 and the thickness of the resin transfer layer 15 are within such ranges, the resin transfer layer has a fragility that cannot be peeled off after being transferred to the postcard body portion 11. In addition, since the transfer is incomplete in the area pressed with a force that allows the adhesive layer 16 and the transfer surface to adhere to each other, the transfer is completely performed in the area pressed with a force exceeding it. You can set it freely.

The adhesive layer 16 is an adhesive layer formed on the resin transfer layer 15 (on the opposite side of the resin transfer layer 15 from the concealing base material 13), and the concealing portion 12 is attached to the postcard body portion 11 by the adhesiveness. Has a function to affix. The adhesive layer 16 is a transparent or translucent layer.
The adhesive layer 16 is formed by printing an acrylic, silicone, rubber or other adhesive.
The pressure-sensitive adhesive layer 16 of the present embodiment is formed by printing an acrylic pressure-sensitive adhesive, the coating amount is 20 g / m ² , and the thickness of the layer is 20 μm.
The coating amount of the adhesive for forming the adhesive layer 16 is preferably ^{5~100g / m 2, 10~50g / m} 2 is more preferable. Moreover, it is preferable that the thickness of the adhesion layer 16 is 5-100 micrometers. If the coating amount of the pressure-sensitive adhesive forming the pressure-sensitive adhesive layer 16 and the thickness of the pressure-sensitive adhesive layer 16 are within such ranges, the resin transfer layer has a fragility that cannot be peeled off after being transferred to the postcard body portion 11, and In the area where the pressure is applied with a force sufficient to bond the adhesive layer 16 and the transfer surface, the transfer is incomplete, and in the area where the pressure is exceeded, the transfer is completely transferred. May be set to Note that the transfer rate is further improved when the amount of the pressure-sensitive adhesive that forms the pressure-sensitive adhesive layer 16 is larger than the amount of the resin that forms the resin transfer layer 15.

The release sheet 17 is a release member having peelability laminated on the adhesive layer 16 and has a function of protecting the surface of the adhesive layer 16. The release sheet 17 of the present embodiment uses a release paper having a silicone resin or the like applied to its surface, but a plastic film or the like imparted with a release property by other resins such as acrylic or PVA (polyvinyl alcohol). It may be used.
The concealing postcard 10 of this embodiment can be provided to the user in a form in which the release sheet 17 is laminated.
The perforation m is a fold that turns the concealment portion 12 back toward the postcard body portion 11 and is formed at a boundary portion between the postcard body portion 11 and the concealment portion 12 (the concealment base material 13). The perforation m has a function of easily folding the concealing portion 12 toward the postcard body portion 11.

In the present embodiment, the release layer 14, the resin transfer layer 15, the adhesive layer 16, and the release sheet 17 have substantially the same area and shape as viewed from the normal direction of the back surface 13 b of the concealing base material 13, and the concealing base material 13. The back surface 13b is formed in a size that can cover the secret information entry column 111.
Further, the concealment postcard 10 of the present embodiment is a weight in a state where the release sheet 17 is peeled off and the concealment part 12 is pasted on the concealment information entry column 111 (that is, the concealment excluding the postcard body part 11 and the release sheet 17). The weight combined with the portion 12) and the size (that is, the size of the postcard main body portion 11) are the weight (2 to 6 g) and the size (length 14 cm to 15. 4 cm, width 9 cm to 10.7 cm).

[Usage 1: Information sender]
Next, a method for using a concealing postcard which is an embodiment of the tamper-proof sheet of the present invention will be described in detail.
FIG. 2 is a view for explaining a method of using a concealing postcard which is an embodiment of the tamper-proof sheet of the present invention. Note that FIG. 2 shows a state in a cross section (FIG. 2A) similar to the cross section shown in FIG.
First, as shown in FIG. 2 (b), the sender who is the information transmission side enters necessary information in the confidential information entry column 111 by writing or the like.
After the entry, the sender peels off the release sheet 17 and folds it along the perforation m so as to cover the concealment information entry field 111 on the back surface 11b side of the postcard body 11 with the concealment part 12 (concealment base material 13). Folding (see FIG. 2 (c)), pressing is performed with such a force that the adhesive layer 16 and the secret information entry column 111 of the postcard body 11 are adhered. Here, the force to the extent that the adhesive layer 16 and the secret information entry column 111 of the postcard body 11 are bonded refers to a pressure of 0.1 to 1.0 kg / cm ² , preferably 0.1 to 0. It refers to a pressure of 5 kg / cm ² . In the low transfer pressure region, which is a region pressed by such force, for example, the resin transfer layer 15 is incompletely transferred as described later (see FIGS. 4C and 5B). In the present embodiment, it is lightly pressed by hand (see FIG. 2D), and the force at this time is 0.5 kg / cm ² . As described above, the concealing portion 12 (the concealing base material 13) is pasted on the secret information entry column 111 of the postcard body 11 by the adhesive layer 16, and the secret information entry column 111 can be concealed. In this state, the sender posts the concealment postcard 10.

[Usage 2: Information Confirmation Side (Regular Person)]
When the recipient on the regular information confirmation side receives the concealment postcard 10, the recipient further presses the concealment postcard 10 with a nip roller or the like before confirming the information written in the concealment information entry column 111.
Here, the pressing may be any 3.0 kg / cm ² or more forces, preferably 3.0~30kg / cm ^2, more preferably 3.0~10kg / cm ^2. If the pressure is 3.0 kg / cm ² or more, the resin transfer layer 15 is completely transferred. If the pressure is 30 kg / cm ² or less, the adhesive layer 16 that is a viscoelastic body protrudes from both sides of the concealing postcard 10. Therefore, it is preferable in that there is no concern that the nip rollers 21a and 21b are soiled or stuck to the nip rollers 21a and 21b.
In the high transfer pressure region, which is a region pressed by such force, for example, the resin transfer layer 15 is completely transferred as described later (see FIGS. 3C and 5A).
In the present embodiment, pressing is performed using the nip rollers 21a and 21b (see FIG. 3A), and the force at this time is 5.0 kg / cm ² .
Thereafter, the recipient peels off the concealing part 12 (the concealing base material 13 and the peeling layer 14) from the postcard body part 11 (see FIG. 3B). At this time, the concealing portion 12 and the postcard body portion 11 are completely peeled between the resin transfer layer 15 and the peeling layer 14.

FIG. 3C shows a state where the concealment portion 12 is peeled off from the concealment postcard 10. Although FIG. 3C shows a state in which the concealing portion 12 (the concealing base material 13 and the peeling layer 14) is cut along the perforation m, the concealing portion 12 may not be cut off.
When the concealment postcard 10 is pressed by a nip roller or the like, the force is uniformly applied to the entire area of the concealment information entry field 111. Therefore, the resin transfer layer 15 is concealed with the resin transfer layer 15 and the release layer 14 completely peeled off. It can be completely transferred onto the information entry field 111 (see FIGS. 3C and 5A).
The method for measuring the transfer rate is not particularly limited, and examples thereof include visual observation, machine identification, and weight measurement. In the present embodiment, the transfer site is visually observed (see FIGS. 3C and 4C).
Here, complete transfer means that the transfer rate of the resin transfer layer 15 to the adhesive layer 16 is 95 to 100%.

[Usage 3: Information Confirmation Side (Malicious Service)]
FIG. 4A is a diagram showing a state where the sender is pressing with such a force that the adhesive layer 16 and the secret information entry column 111 of the postcard body 11 are adhered. Upon receiving the concealment postcard 10, the recipient on the malicious information confirmation side peels off the concealment portion 12 (the concealment base material 13 and the release layer 14) from the postcard body portion 11 (see FIG. 4B). . In this case, the resin transfer layer 15 at the edge portion is not transferred to the adhesive layer 16 but remains on the surface of the release layer 14 (see FIGS. 4C and 5B). In the present embodiment, the resin transfer layer 15 is incompletely transferred onto the secret information entry column 111. Here, incomplete transfer means that the transfer rate of the resin transfer layer 15 to the adhesive layer 16 is less than 95%.

  As described above, according to the present embodiment, the resin transfer layer 15 that forms the concealing portion 12 is incompletely transferred in the region that is pressed with a force that allows the adhesive layer 16 and the transfer surface to adhere to each other. In the area pressed by the force exceeding it, complete transfer is performed. Therefore, whether the third party peeled off the concealment part 12 before the legitimate recipient and illegally viewed it by pressing the concealment part 12 of the concealment postcard with a certain force before the information confirmation side confirmed the information. It can be determined whether or not.

  Further, since the resin forming the resin transfer layer 15 is fragile, the surface of the resin transfer layer 15 (the surface on the release layer 14 side) becomes a rough surface having fine irregularities due to the peeling of the concealing portion 12. Therefore, even if a malicious third party enters false information on the surface of the resin transfer layer 15 with a writing instrument or the like for the purpose of falsifying information, the legitimate information entered in the confidential information entry column 111 by the sender And the false information entered by a third party on the resin transfer layer 15 are different in the color and gloss of written characters, and the false information is entered on the rough surface of the resin transfer layer 15. Since the characters are trembling or distorted in detail, the recipient can easily determine whether or not tampering has occurred.

  In addition, in a conventional tamper-proof sheet provided with transparent tack paper using glassine paper or transparent film, etc., glassine paper or transparent film has a predetermined breaking strength. There is a possibility that false information may be written in the confidential information entry field 111 by peeling. However, according to this embodiment, when the transferred resin transfer layer 15 and the adhesive layer 16 are to be peeled off from the postcard main body 11, the resin transfer layer 15 is not peeled off into a film shape, but due to its fragility. It is peeled off in powder or granular form and destroyed irreparably. Therefore, it is impossible to peel off the resin transfer layer 15 and write false information, and it is possible to prevent falsification of information by a malicious third party.

  Furthermore, since peeling occurs between the resin transfer layer 15 and the peeling layer 14 by peeling off the masking part 12 (the masking base material 13 and the peeling layer 14), the peeling of the masking part 12 on the resin transfer layer 15 side of the peeling masking part 12 is caused. No adhesiveness remains on the surface (the surface of the release layer 14 on the resin transfer layer 15 side) or on the surface of the resin transfer layer 15 on the postcard body 11 side. Therefore, the peeled concealment base material 13 cannot be pasted on the concealment information entry column 111 again. Therefore, when a malicious third party peels off the concealment portion 12 (the concealment base material 13 and the release layer 14) for the purpose of stealing information, the concealment portion 12 cannot be pasted again to return to the state before peeling. The recipient can easily detect that someone other than the recipient has peeled off the concealment unit 12.

[Deformation]
As described above, various modifications and changes are possible without being limited to the embodiments described above, and these are also within the scope of the present invention.

  (1) Although the example in which the resin transfer layer 15 is formed of an ultraviolet curable resin has been shown, the origin is not limited thereto, and the resin transfer layer 15 is formed of a thermosetting resin such as Metamocolor (manufactured by Pilot Ink Co., Ltd.). Also good.

  (2) Although the example in which the concealing postcard is pressed by the nip rollers 21a and 21b has been described, the present invention is not limited to this, and may be performed by, for example, a rod-shaped jig such as a seal bar.

  (3) Although the example in which the peeling layer 14, the resin transfer layer 15, and the adhesive layer 16 are formed by printing has been shown, the present invention is not limited thereto, and may be formed by coating, for example.

(4) Although the concealment part 12 showed the example provided in the extension direction of the long side of the postcard main-body part 11, it is not limited to this, If the confidential information entry column 111 can be concealed, the postcard main-body part 11 You may provide in the extension direction of the short side.
In the embodiment, the concealing unit 12 may conceal the entire back surface 11 b of the postcard body unit 11.

(5) The release layer 14, the resin transfer layer 15, the adhesive layer 16, and the release sheet 17 are all the same size when viewed from the normal direction of the back surface 11 b of the postcard main body 11. Although an example in which the back surface 13b is formed on substantially the entire surface is shown (see FIG. 1B), the present invention is not limited to this, and if the secret information entry column 111 can be concealed, these layers are formed on the back surface 13b. The resin transfer layer 15 may be formed smaller than the other layers.
In addition, a peeling introduction portion or the like that may be a trigger when the concealing portion 12 is peeled may be formed in a portion of the back surface 13b where the adhesive layer 16 or the like is not formed.

  (6) Although an example in which the perforation m is provided as a fold line is shown, the present invention is not limited to this, and for example, a fold line may be provided by providing half-cutting, line pushing, embossing, or the like.

  (7) In the falsification preventing sheet of the present invention, a predetermined temperature is set as a threshold value for the resin forming the resin transfer layer 15 so that the transfer region of the resin transfer layer 15 can be visually discriminated with respect to the transfer surface. In addition, a temperature indicating ink that changes color reversibly, or a treatment that adds ink that changes color when irradiated with light in a specific wavelength region (for example, ultraviolet rays, infrared rays, or electron beams) may be added. As a result, it becomes easy for the recipient who is the legitimate information confirmation side to determine the degree of transfer of the resin transfer layer 15.

  In addition, although this embodiment and modification can also be used in combination suitably, detailed description is abbreviate | omitted. Further, the present invention is not limited by the embodiments described above.

  EXAMPLES Hereinafter, although this invention is demonstrated further in detail based on an Example, this invention is not limited to these descriptions at all.

<Test Example 1>
[Examination of transfer pressure]
For the examination of the transfer pressure, on the release paper A (EN64 Shiro P: manufactured by Lintec), a resin transfer layer (UV BF SG medium, coating amount 10 g / m ² , layer thickness 10 μm: manufactured by Inktec) and adhesive A tamper-proof sheet (width 50 mm) in which a layer (Olivein BPW6111, coating amount 20 g / m ² , layer thickness 20 μm: Toyo Ink Manufacturing Co., Ltd.) and release film B (Therapeutic MFA (S): Toray film processing) are sequentially formed X length 100 mm) was used. The release paper B of the tamper-proof sheet was peeled off, and the adhesive surface was attached to a high-quality paper with a predetermined load. After 30 seconds, the release paper A was peeled off under conditions based on JIS Z0237 with a 180 ° peeling and a peeling speed of 300 mm / min. Then, the quality of the resin surface transferred to the high quality paper when the release paper A was peeled was confirmed, and the transfer rate of the resin transfer layer to the adhesive layer was measured by visual observation. The results are shown in Table 1.
The EN64 white P used for the release paper A is a release paper in which silicone is coated on the polyethylene laminated surface of a high-quality paper subjected to polyethylene lamination, and the UV BF SG medium used for the resin transfer layer is an acrylate, rosin , Photopolymerization initiator, resin transfer layer formed of resin that is a mixture of monomers, and oliveline BPW6111 used for the adhesive layer is an adhesive layer formed of water-based emulsion acrylic adhesive, and used for release film B The therapy MFA (S) was a release PET film coated with silicone. Further, as the high quality paper, a grate whose surface was not processed (e.g., easy adhesion, coating suitability improvement coating, resin coating, etc.) was used.

It was found that by applying a load of 3.0 kg / cm ² or more, the resin transfer layer forming the falsification preventing sheet transfers without causing transfer failure.

<Test Example 2>
[Examination of application amount of resin and adhesive]
For the examination of the transfer pressure, on the release paper A (EN64 Shiro P: manufactured by Lintec), a resin transfer layer (UV BF SG medium, coating amount 5-20 g / m ² , layer thickness 5-20 μm: manufactured by Inktec) ), Adhesive layer (Olivein BPW6111, coating amount 5 to 40 g / m ² , layer thickness 5 to 40 μm: Toyo Ink Co., Ltd.) and release film B (Therapeutic MFA (S): Toray film processing) are sequentially formed A tamper-proof sheet (width 50 mm × length 100 mm) was used. The release paper B of the falsification preventing sheet was peeled off and applied to a high quality paper with a load of 3.0 kg / cm ² applied to the adhesive surface. After 30 seconds, the release paper A was peeled off under conditions based on JIS Z0237 with a 180 ° peeling and a peeling speed of 300 mm / min. Then, the surface quality of the resin surface transferred to the high quality paper when the release paper A was peeled was confirmed, and the degree of transfer of the resin transfer layer to the adhesive layer was visually evaluated. The results are shown in Table 2.

  It was found that the transfer amount of the pressure-sensitive adhesive that forms the pressure-sensitive adhesive layer 16 is more complete than that of the resin that forms the resin transfer layer 15.

(A)-(c) is a figure which shows the concealment postcard using the falsification prevention sheet | seat of one Embodiment. (A)-(d) is a figure which shows sequentially the usage method of the information transmission side of the concealment postcard shown in FIG. (A)-(c) is a figure which shows sequentially the usage method of the information confirmation side (regular person) of the concealment postcard shown in FIG. (A)-(c) is a figure which shows sequentially the usage method of the information confirmation side (malicious person) of the concealment postcard shown in FIG. (A), (b) is a schematic top view which shows the back surface side after the information confirmation of the concealment postcard shown in FIG.

Explanation of symbols

10 Concealment postcard 11 Postcard body 111 Concealment information entry column 12 Concealment part (tamper-proof sheet)
13 Concealing base material 14 Release layer 15 Resin transfer layer 16 Adhesive layer 17 Release sheet 21a, 21b Nip roller

Claims (8)

On the release substrate, a resin transfer layer for preventing information falsification and an adhesive layer are sequentially formed,
The resin transfer layer transferred to the transfer surface together with the adhesive layer is incompletely transferred in a low transfer pressure region where the pressure is pressed to such a degree that the adhesive layer and the transfer surface adhere to each other. A tamper-proof sheet that is completely transferred in the high transfer pressure area that is pressed by the. The tamper-proof sheet according to claim 1, wherein a pressure applied to the high transfer pressure region is 3.0 kg / cm ² or more. The coating amount of the resin forming the resin transfer layer, tamper proof sheet according to claim 1 or 2 is 5 to 40 g / m ^2. The coating amount of the pressure-sensitive adhesive that forms adhesive layer is tamper proof sheet according to any one of claims 1 in 5 to 100 g / m ² 3 of.   The tamper-proof sheet according to any one of claims 1 to 4, wherein the resin transfer layer is subjected to a process in which a transfer region is visually distinguishable with respect to a transfer target surface. A postcard main body provided with a secret information entry field for entering confidential information, and a concealment section that is connected to the postcard main body with a fold line interposed therebetween and can cover at least the confidential information by folding the fold line. A concealment postcard that
A concealing postcard using the falsification preventing sheet according to any one of claims 1 to 5 as the concealing portion, wherein the peeling substrate is a concealing substrate. A concealing postcard according to claim 6, wherein a method of judging whether or not there is unauthorized browsing based on the transfer rate of the resin transfer layer,
After filling in the secret information on the information transmission side and covering the secret information with the concealment unit, the resin transfer layer is imperfect by pressing with the force that the adhesive layer and the transferred surface are bonded. Make a transcription,
Thereafter, on the information confirmation side, the resin transfer layer is completely transferred by pressing the concealment postcard after the incomplete transfer with a force exceeding it,
A method of judging illegal browsing by the presence of the concealed postcard of the incomplete transfer. The method for determining unauthorized browsing according to claim 7, wherein the complete transfer is mechanically performed at a pressure of 3.0 kg / cm ² or more.

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