Pressure sheet

Abstract

To provide a pressure bonding sheet in which a plurality of pieces of paper connected through a folding part is adhered peelably, the pressure bonding sheet attempting forgery prevention with an easy producing method while sufficiently holding adhesive force for adhering the plurality of pieces of paper.SOLUTION: A pressure bonding sheet comprises a pseudo adhesion layer 3 laminated on each of adhering surfaces of a concealing piece 10 and a body piece 20 connected through a folding part 30 to adhere the concealing piece 10 and the body piece 20 peelably, and latent image printing layers 11 and 21 formed on the pseudo adhesion layer 3 in a manner such that a latent image pattern appears by copying. Dot concentration of the latent image printing layers 11 and 21 is 7% or higher and 18% or lower.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a pressure-sensitive sheet in which a plurality of pieces of paper connected via a fold are detachably attached, and more particularly to a forgery prevention technique.

Background Art

[0002] Conventionally, in prepaid cards, various tickets, gift certificates, stock certificates and other valuable securities, forgery crimes have occurred frequently because they are widely circulated and can be cashed relatively easily. In particular, in recent years, with the improvement in performance and spread of copying machines such as color copiers, it has become relatively easy to manufacture forged products that cannot be easily distinguished from genuine products, and countermeasures against forgery are required.

[0003] Patent Document 1 discloses a pressure-sensitive postcard with countermeasures against such forgery. In the pressure-sensitive postcard disclosed in Patent Document 1, for example, a method of making a watermark by thinning the paper thickness of the watermark portion during paper making to make a white watermark, or a method of increasing the light transmittance of the paper by printing a transparent ink containing wax or the like at the same time as printing a pattern or the like to make a pseudo watermark portion is used to provide a watermark portion, thereby making it impossible to forge by copying or the like.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, the method disclosed in Patent Document 1 is a method of partially thinning the paper thickness or using a special ink during paper making, so there is a problem that the burden during manufacturing is large and it cannot be easily manufactured.

[0006] In the field of anti-counterfeiting as described above, in a form where a latent image pattern is developed by being copied, a latent image printing layer is formed on a substrate, and a technique for developing a latent image pattern when copied is widely used. In a case where a latent image printing layer for developing such a latent image pattern is formed on a substrate, since the latent image printing layer is composed of a pattern component portion constituting the latent image pattern and a background component portion which is the other region, it is necessary to perform printing over a certain area as the latent image printing layer. On the other hand, in a pressure-sensitive sticker where two pieces of paper are detachably attached, a so-called pre-pasting process is adopted in which printing is performed after a pseudo-adhesive layer is laminated on the substrate. If printing is performed over a certain area like the above-described latent image printing layer, there is a risk that the adhesive force for attaching the two pieces of paper cannot be sufficiently ensured. According to the Postal Law, in a pressure-sensitive sticker where two pieces of paper are detachably attached, it is necessary that the two pieces of paper are securely attached over their entire surfaces, and it is not preferable that a part of them peels off during mailing due to insufficient adhesive force being ensured.

[0007] The present invention has been made in view of the problems of the conventional technologies as described above, and an object thereof is to provide a pressure-sensitive sheet in which a plurality of pieces of paper connected via a fold portion are detachably attached, and which can sufficiently ensure the adhesive force for attaching the plurality of pieces of paper and can achieve anti-counterfeiting by an easy manufacturing method.

Means for Solving the Problems

[0008] To achieve the above object, the present invention is a pressure-sensitive sheet in which a first piece of paper and a second piece of paper connected via a fold portion are detachably attached, a pseudo-adhesive layer laminated on the mutual attachment surfaces of the first piece of paper and the second piece of paper for detachably attaching the first piece of paper and the second piece of paper, and a latent image printing layer formed in a form in which a latent image pattern is developed by being copied on at least a part of the pseudo-adhesive layer, wherein the latent image printing layer has a dot density of 7% or more and 18% or less.

[0009] In the present invention configured as described above, in a pressure-sensitive adhesive sheet in which a first piece of paper and a second piece of paper connected via a fold are detachably adhered, at least a part of the pseudo-adhesive layers laminated on substantially the entire adhesion surfaces of the first piece of paper and the second piece of paper respectively has a latent image printing layer formed thereon in a form that develops a latent image pattern by being copied. As a result, when copied, the latent image pattern is developed, thereby preventing forgery. Since the dot density of the latent image printing layer is 7% or more, the latent image pattern is surely developed when copied. However, since the dot density of the latent image printing layer is 18% or less, sufficient adhesive strength is ensured when the first piece of paper and the second piece of paper are detachably adhered, and forgery prevention is achieved by an easy manufacturing method of forming the latent image printing layer on the pseudo-adhesive layer.

[0010] Further, if the latent image printing layer is formed in an area that does not overlap when the first piece of paper and the second piece of paper are folded via the fold in each of the first piece of paper and the second piece of paper, then when the first piece of paper and the second piece of paper are detachably adhered, sufficient adhesive strength is further ensured over the entire surface thereof.

[0011] Also, when the latent image printing layer is formed in an area that overlaps when the first piece of paper and the second piece of paper are folded via the fold in each of the first piece of paper and the second piece of paper, sufficient adhesive strength is further ensured by the dot density of the latent image printing layer being 7% or more and 14% or less.

Effects of the Invention

[0012] According to the present invention, in a pressure-sensitive sheet in which a first piece of paper and a second piece of paper connected via a fold portion are detachably adhered, the dot density of a latent image printing layer formed in a form that develops a latent image pattern by being copied is 7% or more on substantially the entire adhesion surfaces of the first piece of paper and the second piece of paper. By this, while surely developing the latent image pattern when copied, since the dot density of the latent image printing layer is 18% or less, sufficient adhesive force for adhering the two pieces of paper can be ensured, and forgery prevention can be achieved by an easy manufacturing method.

[0013] Further, in the case where the latent image printing layer is formed in a region that does not overlap when the first piece of paper and the second piece of paper are folded via the fold portion in each of the first piece of paper and the second piece of paper, when the first piece of paper and the second piece of paper are detachably adhered, sufficient adhesive force can be further ensured over the entire surface.

[0014] Further, in the case where the latent image printing layer is formed in a region that overlaps when the first piece of paper and the second piece of paper are folded via the fold portion in each of the first piece of paper and the second piece of paper, since the dot density of the latent image printing layer is 7% or more and 14% or less, sufficient adhesive force can be further ensured.

Brief Description of the Drawings

[0015]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Embodiments for Carrying Out the Invention

[0016] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0017] FIG. 1 is a diagram showing an embodiment of the pressure-sensitive sheet of the present invention, where (a) is a diagram showing one surface, (b) is a cross-sectional view taken along line A-A' shown in (a), (c) is a cross-sectional view taken along line B-B' shown in (a), and (d) is a diagram showing the other surface.

[0018] As shown in FIG. 1, the pressure-sensitive sticker 1 in this embodiment is formed by laminating a pseudo-adhesive layer 3 on the entire surface of one side of a base sheet 2 in which a main body piece 20 and a concealment piece 10 are connected with each other's one side as a connecting side, laminating a latent image printing layer 21 on a part of the pseudo-adhesive layer 3 on the main body piece 20, and laminating a latent image printing layer 11 on a part of the pseudo-adhesive layer 3 on the concealment piece 10. Note that the pseudo-adhesive layer 3 may not be laminated on a part of the base sheet 2, and including this case, it is defined that the pseudo-adhesive layer 3 is laminated on substantially the entire surface of the base sheet 2.

[0019] The main body piece 20 is the first piece of paper in the present invention. A folding part 30 is formed on the connecting side between the main body piece 20 and the concealment piece 10 by means of a half slit, score line, sewing, etc., whereby the base sheet 2 can be folded through the folding part 30. The pseudo-adhesive layer 3 is such that when the base sheet 2 is folded through the folding part 30 with the surface on which the pseudo-adhesive layer 3 is laminated on the inside, the main body piece 20 and the concealment piece 10 can be peeled off and cannot be reattached after peeling, and well-known ones can be used.

[0020] On the surface of the main body piece 20 where the pseudo - adhesive layer 3 is laminated, a notification information display column 22 for printing notification information to be notified using this pressure - sensitive sticker 1 is printed on the pseudo - adhesive layer 3 by printing, and the latent image printing layer 21 is formed and laminated in a region that does not overlap with the notification information display column 22 as described above. Further, a type display 23 indicating that the pressure - sensitive sticker 1 is a postal sticker is printed.

[0021] The latent image printing layer 21 is composed of a pattern component part 21a and a background component part 21b. The pattern component part 21a constitutes a latent image pattern that appears when the surface of the pressure - sensitive sticker 1 on which the latent image printing layer 21 is formed is copied by a copying machine as described later, and the background component part 21b is the other region, which becomes invisible when the surface of the pressure - sensitive sticker 1 on which the latent image printing layer 21 is formed is copied by a copying machine. The pattern component part 21a can be formed using well - known techniques. For example, as the latent image printing layer 21, printing can be performed on the pseudo - adhesive layer 3 so that a plurality of dots with slightly different sizes from each other in the pattern component part 21a and the background component part 21b are arranged regularly or irregularly. When making the dot sizes different in this way, it is conceivable to make the size of one dot constituting the pattern component part 21a slightly larger than the size of one dot constituting the background component part 21b. In such a configuration, when the latent image printing layer 21 is visually recognized with the naked eye, it is difficult to clearly distinguish the dots constituting the pattern component part 21a from the dots constituting the background component part 21b, making it difficult to recognize the latent image pattern formed by the pattern component part 21a. However, when the latent image printing layer 21 is copied by a copying machine, the dots constituting the pattern component part 21a and the dots constituting the background component part 21b are clearly distinguished, and the latent image pattern formed by the pattern component part 21a can be clearly visually recognized. Thus, the latent image printing layer 21 has, in part, a latent image pattern that is difficult to visually recognize with the naked eye but appears when copied by a copying machine.

[0022] On the surface of the main body piece 20 opposite to the surface where the pseudo - adhesive layer 3 is laminated, a background pattern printing layer 24 is laminated on substantially the entire surface.

[0023] The concealment piece 10 serves as the second piece of paper in the present invention. On the surface of the concealment piece 10 where the pseudo-adhesive layer 3 is laminated, a notification information display column 12 for notifying using this pressure-sensitive sticker 1 is printed with notification information, and the latent image printing layer 11 is formed and laminated in a region that does not overlap the notification information display column 12 as described above. Note that the latent image printing layer 11 is formed in a region that does not overlap with the latent image printing layer 21 of the main body piece 20 when the base sheet 2 is folded through the folding portion 30. Further, in the concealment piece 10, a hole portion 13 for exposing the type display 23 is provided in a region facing the type display 23 of the main body piece 20 when the base sheet 2 is folded through the folding portion 30, and a notch 14 is formed by cutting one corner portion not adjacent to the folding portion 30.

[0024] The latent image printing layer 11 is composed of a pattern constituent portion 11a and a background constituent portion 11b. The pattern constituent portion 11a constitutes a latent image pattern that appears when the surface of the pressure-sensitive sticker 1 where the latent image printing layer 11 is formed is copied by a copying machine, similar to the pattern constituent portion 21a of the main body piece 20. The background constituent portion 11b is the other region, and similar to the background constituent portion 21b of the main body piece 20, it becomes invisible when the surface of the pressure-sensitive sticker 1 where the latent image printing layer 11 is formed is copied by a copying machine. By having these pattern constituent portion 11a and background constituent portion 11b have a configuration similar to that of the pattern constituent portion 21a and background constituent portion 21b of the main body piece 20, for example, when the latent image printing layer 11 is visually recognized with the naked eye, the latent image pattern by the pattern constituent portion 11a is difficult to recognize, and when the latent image printing layer 11 is copied by a copying machine, the latent image pattern by the pattern constituent portion 11a can be clearly recognized.

[0025] On the surface of the concealment piece 10 opposite to the surface where the pseudo-adhesive layer 3 is laminated, a destination information display area 15 for printing the destination information indicating the destination of this pressure-sensitive sticker 1 is provided.

[0026] Note that the latent image printing layers 11 and 21 are not limited to those formed by printing such that a plurality of dots, whose sizes are slightly different from each other between the pattern forming portions 11a and 21a and the background forming portions 11b and 21b, are arranged regularly or irregularly as described above. On the pseudo-adhesive layer 3, printing may be performed such that a plurality of lines are parallel to each other, and among them, only the pattern forming portions 11a and 21a may be formed in a form that causes a latent image pattern to appear by being copied, such as by varying the line width or direction. Any form may be used as long as it is formed in a form that causes a latent image pattern to appear by being copied.

[0027] Hereinafter, a method for manufacturing the pressure-sensitive sticker 1 configured as described above will be described.

[0028] FIG. 2 is a diagram for explaining the method for manufacturing the pressure-sensitive sticker 1 shown in FIG. 1.

[0029] When manufacturing the pressure-sensitive sticker 1 shown in FIG. 1, first, a pseudo-adhesive layer 3 is laminated by applying a pseudo-adhesive that enables peeling after sticking and does not enable re-sticking after peeling to the entire surface of one side of the base sheet 2 (FIG. 2(a)).

[0030] Next, on the surface of the base sheet 2 on which the pseudo-adhesive layer 3 is laminated, latent image printing layers 11 and 21 having the above-described configuration are formed on the concealment piece 10 and the main body piece 20, respectively, by printing, and further, ruled lines indicating the notification information display columns 12 and 22 are printed (FIG. 2(b)). Also, a background printing layer 24 is laminated by printing on the surface of the main body piece 20 opposite to the surface on which the pseudo-adhesive layer 3 is laminated.

[0031] Next, notification information 12a and 12b to be notified using this pressure-sensitive sticker 1 are printed on the notification information display columns 12 provided on the concealment piece 10 and the notification information display columns 22 provided on the main body piece 20, respectively (FIG. 2(c)).

[0032] Thereafter, it is folded through the folding portion 30 such that the surface on which the pseudo-adhesive layer 3 is laminated is on the inside, and the main body piece 20 and the concealment piece 10 are detachably attached to each other by the pseudo-adhesive layer 3.

[0033] The usage method of the above-mentioned pressure-sensitive sticker 1 and its effects will be described below.

[0034] Figure 3 is a diagram for explaining the usage method and its effects when unsealing the pressure-sensitive sticker 1 shown in Figure 1.

[0035] As shown in Figure 3(a), the pressure-sensitive sticker 1 shown in Figure 1 is delivered to the destination of the pressure-sensitive sticker 1 according to the destination information 15a printed in the destination information display area 15 of the concealment piece 10, and then is unsealed by peeling the concealment piece 10 from the main body piece 20. At that time, since the concealment piece 10 is provided with a notch 14 at its corner, it can be easily peeled and unsealed from the main body piece 20 with this notch 14 as the peeling start end.

[0036] When the concealment piece 10 is peeled from the main body piece 20, as shown in Figure 3(b), the notification information 12a printed in the notification information display column 12 of the concealment piece 10 and the notification information 22a printed in the notification information display column 22 of the main body piece 20 become visible respectively, and thereby, the notification information 12a, 22a is notified to the destination of the pressure-sensitive sticker 1. In the latent image printing layer 21 formed on the main body piece 20, although it has a pattern forming part 21a for developing a latent image pattern in the background forming part 21b, when the latent image printing layer 21 is visually recognized with the naked eye, the dots constituting the pattern forming part 21a and the dots constituting the background forming part 21b cannot be clearly distinguished, making it difficult to recognize the latent image pattern by the pattern forming part 21a. Similarly, in the latent image printing layer 11 formed on the concealment piece 10, although it has a pattern forming part 11a for developing a latent image pattern in the background forming part 11b, when the latent image printing layer 11 is visually recognized with the naked eye, the dots constituting the pattern forming part 11a and the dots constituting the background forming part 11b cannot be clearly distinguished, making it difficult to recognize the latent image pattern by the pattern forming part 11a.

[0037] Figure 4 is a diagram for explaining the effects when the surfaces of the latent image printing layers 11, 21 of the pressure-sensitive sticker 1 shown in Figure 1 are copied by a copying machine.

[0038] In the pressure-sensitive label 1 shown in FIG. 1, in the latent image printing layers 11 and 21, printing is performed such that a plurality of dots having slightly different sizes from each other are arranged regularly or irregularly on the pseudo-adhesive layer 3, with pattern components 11a and 21a and background components 11b and 21b. Since the size of one dot constituting the pattern components 11a and 21a is slightly larger than the size of one dot constituting the background components 11b and 21b, when the latent image printing layers 11 and 21 are copied by a copying machine, the dots constituting the pattern components 11a and 21a and the dots constituting the background components 11b and 21b are clearly distinguished. As a result, as shown in FIG. 4, for example, while the background components 11b and 21b become invisible, the latent image patterns 16 and 25 formed by the pattern components 11a and 21a are clearly visible.

[0039] In this way, in the pressure-sensitive label 1 shown in FIG. 1, when viewed with the naked eye, the latent image patterns 16 and 25 formed by the latent image printing layers 11 and 21 are difficult to recognize, while when copied by a copying machine, the latent image patterns 16 and 25 are clearly visible, thus enabling forgery prevention.

[0040] The dot density of the latent image printing layers 11 and 21 will be described below.

[0041] As in the pressure-sensitive label 1 described above, when a pseudo-adhesive layer 3 is laminated on the base sheet 2, and a ruled line or the like indicating the notification information display columns 12 and 22 is printed on this pseudo-adhesive layer 3, and the latent image printing layers 11 and 21 are formed by printing, depending on the dot density in these printings, there is a risk that the adhesive force for attaching the main body piece 20 and the concealment piece 10 cannot be sufficiently ensured. In particular, in the latent image printing layers 11 and 21, as described above, since they are composed of the pattern components 11a and 21a constituting the latent image pattern and the background components 11b and 21b in the other regions, printing needs to be performed over a certain area as the latent image printing layers 11 and 21, so the possibility that the adhesive force for attaching the main body piece 20 and the concealment piece 10 cannot be sufficiently ensured becomes high.

[0042] Therefore, in the pressure-sensitive sticker 1 of the present embodiment, by adjusting the dot density of the latent image printing layers 11 and 21, sufficient adhesive force for attaching the main body piece 20 and the concealing piece 10 is ensured.

[0043] FIG. 5 is a diagram showing the results of evaluating the adhesive force between the main body piece 20 and the concealing piece 10 according to the dot density of the latent image printing layers 11 and 21 and the visibility of the latent image pattern during copying in the pressure-sensitive sticker 1 shown in FIG. 1.

[0044] Similar to the pressure-sensitive sticker 1 shown in FIG. 1, for a configuration in which a pseudo-adhesive layer 3 is laminated on the entire one surface of a base sheet 2 in which the main body piece 20 and the concealing piece 10 are foldably configured via a folding portion 30, as shown in FIG. 5, the dot density of the latent image printing layers 11 and 21 formed and laminated on the pseudo-adhesive layer 3 was changed, and the visibility of the latent image pattern during copying and the adhesive force between the main body piece 20 and the concealing piece 10 were evaluated respectively. Regarding the visibility of the latent image pattern during copying, when the latent image pattern clearly appears after copying and the latent image pattern can be clearly distinguished before and after copying, it is marked as "〇"; when the latent image pattern appears after copying and the latent image pattern can be distinguished before and after copying, it is marked as "△"; when there is no contrast between the pattern forming portions 11a and 21a and the background forming portions 11b and 21b and the latent image pattern does not appear after copying, it is marked as "×". Also, regarding the adhesive force between the main body piece 20 and the concealing piece 10, when the adhesive force when sealed at a GAP of 300 μm is 1.60 N / 6" or more, it is marked as "〇"; when the adhesive force when sealed at a GAP of 300 μm is 1.00 N / 6" or more and less than 1.60 N / 6", it is marked as "△"; when the adhesive force when sealed at a GAP of 300 μm is less than 1.00 N / 6", it is marked as "×".

[0045] Regarding the visibility of the latent image pattern during copying, as shown in FIG. 5, if the dot density of the latent image printing layers 11 and 21 is 7% or more, the latent image pattern appears after copying, and the latent image pattern can be distinguished before and after copying.

[0046] Regarding the adhesive strength between the main body piece 20 and the concealing piece 10, as shown in FIG. 5, for a single-sided screen in which the latent image printing layer is laminated on only one of the main body piece 20 and the concealing piece 10, when the dot density of the latent image printing layer is 18% or less, an adhesive strength of 1.60 N / 6” or more can be obtained when sealed with a GAP of 300 μm. When the dot density of the latent image printing layer is 19% - 20%, an adhesive strength of 1.00 N / 6” or more and less than 1.60 N / 6” can be obtained when sealed with a GAP of 300 μm.

[0047] That is, even when the latent image printing layer is provided on each of the main body piece 20 and the concealing piece 10, if it is formed in a non-overlapping area when the main body piece 20 and the concealing piece 10 are folded via the folding portion 30, by setting the dot density of the latent image printing layer to 20% or less, an adhesive strength of 1.00 N / 6” or more and less than 1.60 N / 6” can be obtained when sealed with a GAP of 300 μm. Furthermore, by setting the dot density of the latent image printing layers 11, 21 to 18% or less, an adhesive strength of 1.60 N / 6” or more can be obtained when sealed with a GAP of 300 μm, and sufficient adhesive strength can be ensured over the entire surface.

[0048] On the other hand, as shown in FIG. 5, for a double-sided screen in which the latent image printing layer is laminated on both the main body piece 20 and the concealing piece 10, when the dot density of the latent image printing layer is 14% or less, an adhesive strength of 1.60 N / 6” or more can be obtained when sealed with a GAP of 300 μm. When the dot density of the latent image printing layer is 15% - 20%, an adhesive strength of 1.00 N / 6” or more and less than 1.60 N / 6” can be obtained when sealed with a GAP of 300 μm.

[0049] That is, when the latent image printing layer is formed in the overlapping area when the main body piece 20 and the concealment piece 10 are folded via the folding part 30 in each of the main body piece 20 and the concealment piece 10, by setting the dot density of the latent image printing layer to 20% or less, an adhesive force of 1.00 N / 6” or more and less than 1.60 N / 6” can be obtained when sealing with a GAP of 300 μm. Further, by setting the dot density of the latent image printing layer to 14% or less, an adhesive force of 1.60 N / 6” or more can be obtained when sealing with a GAP of 300 μm, and sufficient adhesive force can be further ensured.

[0050] Thus, in the pressure-sensitive sticker 1 in which the main body piece 20 and the concealment piece 10 connected via the folding part 30 are detachably attached, the dot density of the latent image printing layers 11 and 21 formed in a form in which a latent image pattern is expressed by being copied on the pseudo-adhesive layers 3 laminated on the respective adhering surfaces of the main body piece 20 and the concealment piece 10 is 7% or more. By this, while surely expressing the latent image pattern when copied, since the dot density of the latent image printing layers 11 and 21 is 18% or less, sufficient adhesive force for attaching the main body piece 20 and the concealment piece 10 can be ensured, and forgery prevention can be achieved by an easy manufacturing method of forming the latent image printing layers 11 and 21 on the pseudo-adhesive layer 2.

[0051] Also, if the latent image printing layer is formed in the non-overlapping area when the main body piece 20 and the concealment piece 10 are folded via the folding part in each of the main body piece 20 and the concealment piece 10, when the main body piece 20 and the concealment piece 10 are detachably attached, sufficient adhesive force can be further ensured over the entire surfaces of the concealment piece 10 and the main body piece 20.

[0052] Also, even if the latent image printing layer is formed in the overlapping area when the main body piece 20 and the concealment piece 10 are folded via the folding part in each of the main body piece 20 and the concealment piece 10, by setting the dot density of the latent image printing layer to 7% or more and 14% or less, sufficient adhesive force can be further ensured.

[0053] (Other embodiments) FIG. 6 is a diagram showing another embodiment of the pressure-sensitive sheet of the present invention, where (a) is a view showing one surface, (b) is a cross-sectional view taken along line A-A' shown in (a), and (c) is a view showing the other surface.

[0054] As shown in FIG. 6, the pressure-sensitive sheet in this embodiment is different from the one shown in FIG. 1 in that a notification information display column 122 is provided in the region of the main body piece 120 where the latent image printing layer 121 composed of the pattern component part 121a and the background component part 121b is laminated, and a notification information display column 112 is provided in the region of the cover piece 110 where the latent image printing layer 111 composed of the pattern component part 111a and the background component part 111b is laminated. It is a pressure-sensitive postcard 101.

[0055] Also in the pressure-sensitive postcard 101 configured as described above, similar to the one shown in FIG. 1, when viewed with the naked eye, in the latent image printing layers 111 and 121, the dots constituting the pattern component parts 111a and 121a and the dots constituting the background component parts 111b and 121b cannot be clearly distinguished, making it difficult to recognize the latent image pattern formed by the pattern component parts 111a and 121a. However, when copied with a copying machine, the dots constituting the pattern component parts 111a and 121a and the dots constituting the background component parts 111b and 121b are clearly distinguished. As a result, for example, while the background component parts 111b and 121b become invisible, the latent image pattern formed by the pattern component parts 111a and 121a can be clearly seen. Thereby, forgery prevention can be achieved. At that time, by setting the dot density of the latent image printing layers 111 and 121 to 7% or more, the latent image pattern can be surely developed when copied with a copying machine, and by setting the dot density of the latent image printing layers 111 and 121 to 14% or less, the adhesive force for attaching the main body piece 120 and the cover piece 110 can be sufficiently ensured.

[0056] In the embodiment shown in FIG. 6, each of the latent image printing layer 121 laminated on the main body piece 120 and the latent image printing layer 111 laminated on the concealment piece 110 has been described by taking as an example those having substantially the same size as each of the notification information display column 122 of the main body piece 120 and the notification information display column 112 of the concealment piece 110. However, each of the latent image printing layer 121 laminated on the main body piece 120 and the latent image printing layer 111 laminated on the concealment piece 110 may be provided in a configuration that overlaps a part of each of the notification information display column 122 of the main body piece 120 and the notification information display column 112 of the concealment piece 110.

[0057] In the above-described embodiment, the pressure-sensitive sticker 1, 101 in which the main body pieces 20, 120 and the concealment pieces 10, 110 are connected via the folding part 30 and the main body pieces 20, 120 and the concealment pieces 10, 110 are detachably adhered by the pseudo-adhesive layer 3 has been described by taking as an example. However, in a pressure-sensitive sheet such as a pressure-sensitive sticker in which three pieces of paper are connected via a folding part and these three pieces of paper are Z-folded and detachably adhered, the same operation occurs and the same effect can be obtained by applying the configuration of the pseudo-adhesive layer 3 and the latent image printing layers 11, 21, 111, 121 to the adhesion surface.

Explanation of Reference Numerals

[0058] 1, 101 Pressure-sensitive sticker 2 Base sheet 3 Pseudo-adhesive layer 10, 110 Concealment piece 11, 21, 111, 121 Latent image printing layer 11a, 21a, 111a, 121a Pattern component 11b, 21b, 111b, 121b Background component 12, 22, 112, 122 Notification information display column 12a, 22a Notification information 13 Hole part 14 Notch 15 Destination information display area 15a Destination information 16, 25 Latent image pattern 20, 120 Main body piece 23 Type Display 24 Ground Pattern Printing Layer 30 Fold

Claims

1. A pressure-sensitive adhesive sheet in which a first piece of paper and a second piece of paper connected through a folding portion are detachably adhered, a pseudo-adhesive layer laminated on substantially the entire adhesion surfaces of the first piece of paper and the second piece of paper to detachably adhere the first piece of paper and the second piece of paper, and a latent image printing layer formed in a form that develops a latent image pattern by being copied on at least a part of the pseudo-adhesive layer, wherein the latent image printing layer has a dot density of 7% or more and 18% or less. The pressure-sensitive adhesive sheet.

2. In the pressure-sensitive adhesive sheet according to Claim 1, the latent image printing layer is formed in a region where the first piece of paper and the second piece of paper do not overlap when the first piece of paper and the second piece of paper are folded through the folding portion in each of the first piece of paper and the second piece of paper. The pressure-sensitive adhesive sheet.

3. In the pressure-sensitive adhesive sheet according to Claim 1, the latent image printing layer is formed in a region where the first piece of paper and the second piece of paper overlap when the first piece of paper and the second piece of paper are folded through the folding portion in each of the first piece of paper and the second piece of paper, and the dot density is 7% or more and 14% or less. The pressure-sensitive adhesive sheet.

Images