Label

Abstract

To easily detect separation when a label is separated from an attachment target body.SOLUTION: The label includes: a base material 10; a separation layer 20 laminated on one surface of the base material 10 in the shape of a latent image pattern; and an adhesive layer 30 laminated over the entire surface of the base material 10 on which the separation layer 20 is laminated. The adhesive layer 30 has a first region 7a having a first adhesion strength to an adherend and a second region 7b having a second adhesion strength weaker than the first adhesion strength to the adherend.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a label. [Background technology]

[0002] BACKGROUND ART Conventionally, various measures have been taken to detect whether a label that is affixed to an adherend has been improperly removed after affixing.

[0003] For example, Patent Document 1 discloses a label in which a release agent layer is disposed on the back surface of a label substrate in the shape of letters, a pattern, etc., and a colored adhesive is further applied over the release agent layer. When this label is peeled off after being attached to an object, the release agent layer and the adhesive peel off, revealing information such as letters or a pattern.

[0004] By attaching a label having such a structure across the opening portion of an adherend such as a box, it is possible to detect tampering with the adherend. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-330370 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in labels such as those disclosed in Patent Document 1, in which a release layer is laminated in a predetermined pattern on one side of a substrate and a colored adhesive layer is further laminated on the release layer, the release layer and the adhesive layer may not peel off depending on the adhesion strength to the adherend and the method of peeling from the adherend. In labels in which the adhesive layer is made of a stretchable adhesive, when an attempt is made to peel the label off after it has been attached to the adherend, the adhesive layer stretches sufficiently while attached to the adherend, and then the area facing the release layer breaks, resulting in no adhesive layer being present in the area facing the release layer. However, depending on the adhesion strength to the adherend and the method of peeling from the adherend, the adhesive layer may not stretch sufficiently, making it difficult for the area facing the release layer to break. This may result in a risk of leaving no trace of the label having been peeled off from the adherend.

[0007] The present invention has been made in consideration of the problems associated with the conventional technology as described above, and aims to provide a label that can easily detect peeling if it is peeled off after being attached to an adherend. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides: A label that reveals a latent image pattern when peeled off after being attached to an adherend, A base substrate; a release layer laminated on one surface of the base material in the shape of the latent image pattern; a colored adhesive layer laminated over the entire surface of the base substrate on which the release layer is laminated, covering the release layer; The colored adhesive layer is a first region in which the adhesive force to the adherend is a first adhesive force; and a second region in which the adhesive strength to the adherend is a second adhesive strength that is weaker than the first adhesive strength.

[0009] In the present invention configured as described above, when the label is peeled off after being attached to an adherend, the release layer laminated on one side of the base substrate peels off from the colored adhesive layer, revealing a latent image pattern due to the release layer, and peeling is detected. Here, the colored adhesive layer has a first region where its adhesive strength to the adherend is a first adhesive strength and a second region where its adhesive strength to the adherend is a second adhesive strength weaker than the first adhesive strength. Therefore, as the label is peeled off and the portion peeled from the adherend moves from the second region to the first region, its adhesive strength to the adherend increases. As a result, when an attempt is made to subsequently peel the label from the adherend, the load applied to the label as a peeling force increases, acting more strongly between the release layer and the colored adhesive layer in the first region, making it easier for the colored adhesive layer to peel off from the release layer. This reveals a latent image pattern, and peeling is detected.

[0010] In this way, even if the release layer and the colored adhesive layer are difficult to separate when peeled off after being attached to the adherend due to the adhesive strength with the adherend or the method of peeling from the adherend, when the part to be peeled off from the adherend moves from the second region to the first region, the adhesive strength with the adherend becomes stronger, making it easier for the release layer to peel off from the colored adhesive layer. This makes it easier to detect peeling when the release layer is peeled off after being attached to the adherend.

[0011] The first area and the second area may be adjacent to each other via a boundary line connecting two opposing end sides of the label.

[0012] In such a configuration, when the label is peeled from the second area side in a direction perpendicular to the direction in which the boundary line extends, the adhesive force to the adherend becomes stronger via the boundary line, making it easier for the peel layer to peel off from the colored adhesive layer.

[0013] The second region may be sandwiched between two of the first regions via two border lines that extend parallel to each other.

[0014] In such a configuration, when the label is peeled from either side of the direction in which the first and second regions are adjacent in a direction perpendicular to the direction in which the boundary line extends, the adhesive force to the adherend changes from a strong state in the first region to a weak state in the second region, and then becomes strong again in the first region. Therefore, in the part where the adhesive force to the adherend becomes strong again, the load applied to the label as a peeling force increases and acts between the release layer and the colored adhesive layer, making it easier for the release layer to peel from the colored adhesive layer, and the latent image pattern appears, allowing the peeling to be detected.

[0015] The second region is sandwiched between two of the first regions via two boundary lines, One of the two boundary lines is The label is formed by connecting two opposing end edges of the label, The other of the two boundary lines is a main side extending parallel to the one boundary line; The main side may have two sub-sides extending obliquely from both ends thereof toward the one boundary line so as to be separated from each other and reach the end side.

[0016] In such a configuration, when the label is peeled from one of the two boundary lines in the direction in which the two boundary lines are aligned, the portion peeled from the substrate becomes the second region, and then the width of the second region peeled from the substrate narrows.In particular, when the peeled portion moves from the second region to the portion that becomes the first region via the main edge of the other boundary line, the load applied to the label as a peel force concentrates and acts between the peel layer and the colored adhesive layer, making it easier for the peel layer to peel from the colored adhesive layer.

[0017] In addition, the adhesive surface of the second region that adheres to the adherend may be processed to reduce the adhesive strength, so that the adhesive strength of the second region to the adherend is weaker than that of the first region.

[0018] In this configuration, the adhesive strength to the adherend can be made weaker in the second region than in the first region without using adhesives with different adhesive strengths in the first and second regions.

[0019] In addition, the adhesive force of the second region to the substrate may be weaker than that of the first region by configuring the second region to have a material printed on the adhesive surface thereof to eliminate the adhesive force.

[0020] In such a configuration, the adhesive strength of the second region to the adherend can be reduced by applying a general process such as halftone printing to the adhesive surface of the second region without using any special process, thereby making the adhesive strength of the second region to the adherend weaker than that of the first region.

[0021] Also, a label that reveals a latent image pattern when peeled off after being attached to an adherend, A base substrate; a release layer laminated on one surface of the base material in the shape of the latent image pattern; a colored adhesive layer laminated over the entire surface of the base substrate on which the release layer is laminated, covering the release layer; The colored adhesive layer is a first region having adhesive strength to the adherend; The label may have a second region that does not have adhesive strength to the adherend.

[0022] In the present invention configured as described above, when the label is peeled off after being attached to an adherend, the release layer laminated on one side of the base substrate peels off from the colored adhesive layer, revealing a latent image pattern due to the release layer, and peeling is detected. Here, the colored adhesive layer has a first region that has adhesive strength to the adherend and a second region that has a second adhesive strength that does not provide adhesive strength to the adherend. Therefore, when the part of the label that separates from the adherend moves from the second region to the first region, the load applied to the label to separate from the adherend acts greatly between the release layer and the colored adhesive layer in the first region. This makes it easier for the colored adhesive layer to peel off from the release layer in the first region, revealing a latent image pattern and detecting peeling.

[0023] Furthermore, a plurality of the second regions may be arranged side by side.

[0024] In such a configuration, when the label is peeled off in a direction perpendicular to the direction in which the boundary line extends, first areas with strong adhesion to the substrate and second areas with weak adhesion appear alternately, thereby increasing the area in which the latent image pattern is more likely to appear.

[0025] The second regions may be arranged so that their widths in a direction perpendicular to the direction in which the boundary line extends are different from one another.

[0026] In such a configuration, it becomes difficult to adjust the force when peeling the label from the adherend so that the colored adhesive layer does not peel off from the release layer, and the latent image pattern becomes more likely to appear.

[0027] In addition, the colored adhesive layer may be configured so that the first region and the second region are made of adhesives with different adhesive strengths, so that the adhesive strength of the second region to the substrate is weaker than that of the first region.

[0028] In such a configuration, simply by using adhesives with different adhesive strengths, the adhesive strength to the adherend can be made weaker in the second region than in the first region.

[0029] The base material may have a shape having a longitudinal direction, and the direction in which the first region and the second region are adjacent to each other may be the longitudinal direction.

[0030] The adherend may also have two adjacent members, and the adhesive may be attached across the two members so that the first direction is substantially perpendicular to the direction in which the two members are adjacent to each other. [Effects of the Invention]

[0031] According to the present invention, even if the release layer and the colored adhesive layer are difficult to peel off when peeled off after being attached to the adherend due to the adhesive strength to the adherend or the method of peeling off from the adherend, when the part to be peeled off from the adherend moves from the second region to the first region, the adhesive strength to the adherend becomes stronger, making it easier for the release layer to peel off from the colored adhesive layer, thereby making it easier to detect the peeling when it is peeled off after being attached to the adherend.

[0032] Furthermore, when the first region and the second region are adjacent to each other via a boundary line connecting two opposing end edges of the label, peeling the label from the second region side in a direction perpendicular to the direction in which the boundary line extends strengthens the adhesive force to the substrate via the boundary line, making it easier for the peel layer to peel off from the colored adhesive layer.

[0033] In addition, in a case where the second region is sandwiched between two first regions via two boundary lines extending parallel to each other, when peeling occurs from either side of the direction in which the first and second regions are adjacent in a direction perpendicular to the direction in which the boundary lines extend, the adhesive force to the substrate changes from strong in the first region to weak in the second region, and then becomes strong again in the first region.In this way, in the part where the adhesive force to the substrate becomes strong again, the load applied to the label as a peeling force increases and acts between the peeling layer and the colored adhesive layer, making it easier for the peeling layer to peel off from the colored adhesive layer, making it easier to detect the peeling if it is peeled off after being attached to the substrate.

[0034] In addition, in a case where the second region is sandwiched between two first regions via two boundary lines, one of the two boundary lines connecting two opposing end edges of the label, and the other of the two boundary lines has a main edge extending parallel to the one boundary line and two sub-edges extending diagonally from each end of the main edge toward the one boundary line so as to move away from each other and reach the end edge, when the label is peeled from one of the two boundary lines in the direction in which the two boundary lines are aligned, after the part peeled from the substrate becomes the second region, the width of the second region peeled from the substrate narrows, and particularly when the peeling part moves from the second region to the part that becomes the first region via the main edge of the other boundary line, the load applied to the label as a peel force concentrates and acts between the peel layer and the colored adhesive layer, making it easier for the peel layer to peel from the colored adhesive layer.

[0035] In addition, in the case where the adhesive surface of the second region that adheres to the adherend is processed to reduce the adhesive strength, the adhesive strength of the second region to the adherend can be made weaker than that of the first region without using adhesives with different adhesive strengths in the first and second regions.

[0036] In addition, in the case where a material for eliminating adhesive strength is dot printed on the adhesive surface of the second region where it adheres to the adherend, the adhesive strength of the second region to the adherend can be made weaker in comparison with the first region by applying a general process such as dot printing to the adhesive surface of the second region where it adheres to the adherend without applying any special process to reduce the adhesive strength.

[0037] In addition, when the colored adhesive layer has a first region that has adhesive strength to the substrate and a second region that does not have adhesive strength to the substrate, even if the release layer and colored adhesive layer are difficult to separate when peeled off after being attached to the substrate due to the adhesive strength to the substrate or the method of peeling off from the substrate, when the part to be separated from the substrate moves from the second region to the first region, the load applied to the label to separate from the substrate acts greatly between the release layer and the colored adhesive layer in the first region, making it easier for the colored adhesive layer to peel off from the release layer in the first region, and making it easier to detect the peeling when it is peeled off after being attached to the substrate. [Brief explanation of the drawings]

[0038] [Figure 1] 1A and 1B are diagrams showing a first embodiment of a label of the present invention, in which (a) is a surface view and (b) is a cross-sectional view taken along the line AA shown in (a). [Figure 2] 2A and 2B are diagrams showing the configuration of the back surface of the base substrate in the peel detection label shown in FIG. 1, where FIG. 2A shows the configuration of the peel layer, and FIG. 2B shows the configuration of the adhesive layer. [Figure 3] 2 is a diagram showing an example of a usage form of the peel detection label shown in FIG. 1. FIG. [Figure 4] 4 is a cross-sectional view for explaining the basic action of the peel detection label shown in FIG. 1 when it is peeled off from a box when used as shown in FIG. 3. FIG. [Figure 5] 2 is a front view showing the state in which the peel detection label shown in FIG. 1 has been peeled off from the box. FIG. [Figure 6] 2 is a diagram for explaining the action of the two adhesive layers of the peel detection label shown in FIG. 1. FIG. [Figure 7] 2 is a surface view showing the state in which the effect of the two adhesive layers is produced when the peel detection label shown in FIG. 1 is peeled off from the box. FIG. [Figure 8] 2A and 2B are diagrams showing a second embodiment of the label of the present invention, in which (a) is a surface view and (b) is a cross-sectional view taken along the line AA shown in (a). [Figure 9]9A and 9B are diagrams showing the configuration of the back surface of the base substrate in the peel detection label shown in FIG. 8, where (a) is a diagram showing the configuration of the release layer, and (b) is a diagram showing the laminated surface with the release paper. [Figure 10] 9 is a diagram for explaining the effect of the varnish layer of the peel detection label shown in FIG. 8. FIG. [Figure 11] 9 is a surface view showing the state in which the effect of the varnish layer is produced when the peel detection label shown in FIG. 8 is peeled off from the box. [Figure 12] 3A and 3B are diagrams showing a third embodiment of the label of the present invention, in which (a) is a surface view and (b) is a cross-sectional view taken along the line AA shown in (a). [Figure 13] 13A and 13B are diagrams showing the configuration of the back surface of the base substrate in the peel detection label shown in FIG. 12, where (a) is a diagram showing the configuration of the peel layer, and (b) is a diagram showing the laminated surface with the release paper. [Figure 14] 13 is a diagram for explaining the effect of the varnish layer of the peel detection label shown in FIG. 12. FIG. [Figure 15] FIG. 13 is a surface view showing the state in which the effect of the varnish layer is exerted when the peel detection label shown in FIG. 12 is peeled off from the adherend. [Figure 16] 4A and 4B are diagrams showing a fourth embodiment of the label of the present invention, in which (a) is a surface view and (b) is a cross-sectional view taken along the line AA shown in (a). [Figure 17] 17A and 17B are diagrams showing the configuration of the back surface of the base substrate in the peel detection label shown in FIG. 16, where (a) is a diagram showing the configuration of the peel layer, and (b) is a diagram showing the laminated surface with the release paper. DETAILED DESCRIPTION OF THE INVENTION

[0039] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0040] (First embodiment) <Configuration of Peel Detection Label 1> First, the configuration of the peel detection label in this embodiment will be described.

[0041] Fig. 1 shows a first embodiment of the label of the present invention, where (a) is a front view and (b) is a cross-sectional view taken along the line AA in (a). Fig. 2 shows the configuration of the back surface of the base substrate 10 in the peel detection label 1 shown in Fig. 1, where (a) is a view showing the configuration of the peel layer 20 and (b) is a view showing the configuration of the adhesive layer 30.

[0042] As shown in FIG. 1, this embodiment is a peel detection label 1 having a base substrate 10, a peel layer 20, and an adhesive layer 30.

[0043] The base substrate 10 is made of a transparent or translucent film, which allows the color of one side to be seen from the other side. The base substrate 10 has a rectangular shape, and thus has a longitudinal direction.

[0044] As shown in FIGS. 1 and 2, the release layer 20 is laminated on one surface of the base substrate 10. The release layer 20 is made of a release agent such as transparent silicone, and is laminated on one surface of the base substrate 10 by applying the release agent in the shape of a latent image pattern. The latent image pattern is revealed when the peel detection label 1 is peeled off after being attached to an adherend. In this embodiment, the latent image pattern is an arrangement of multiple letters of "VOID," but it may also be a variety of other patterns such as letters, symbols, numbers, and patterns, or a combination of these.

[0045] The adhesive layer 30 is an example of a colored adhesive layer in the present invention, and is laminated on the entire surface of the base substrate 10 on which the release layer 20 is laminated, covering the release layer 20. The adhesive layer 30 is made of an elastic adhesive of any color, such as blue, red, or black, and is laminated by applying the adhesive to the entire surface of the base substrate 10 on which the release layer 20 is laminated. Since the base substrate 10 is made of a transparent or translucent film, the color of the adhesive layer 30 is visible from the surface of the base substrate 10. A release paper 40 is removably attached to the surface of the adhesive layer 30 opposite the release layer 20. The adhesive layer 30 is composed of an adhesive layer 30a and an adhesive layer 30b arranged side by side in the longitudinal direction of the base substrate 10. The adhesive layer 30a is laminated on one longitudinal end of the base substrate 10, covering the release layer 20, and the adhesive layer 30b is laminated on the entire area of ​​the base substrate 10 where the adhesive layer 30a is not laminated, covering the release layer 20. The adhesives constituting the adhesive layer 30a and the adhesives constituting the adhesive layer 30b have different adhesive strengths, with the adhesive constituting the adhesive layer 30a having a stronger adhesive strength than the adhesive constituting the adhesive layer 30b. As a result, the adhesive strength of the adhesive layer 30a is stronger than the adhesive strength of the adhesive layer 30b, and the adhesive layer 30 has a first region 7a formed by the adhesive layer 30a, which has a first adhesive strength with respect to the adherend, and a second region 7b formed by the adhesive layer 30b, which has a second adhesive strength with respect to the adherend that is weaker than the adhesive strength of the adhesive layer 30a, and these regions 7a and 7b are adjacent to each other via a boundary line L1. The boundary line L1 extends in the width direction of the base substrate 10 between two opposing end sides that extend in the length direction of the base substrate 10.

[0046] <How to use peel detection label 1> Next, a method of using the peel detection label 1 configured as above will be described.

[0047] FIG. 3 is a diagram showing an example of how the peel detection label 1 shown in FIG. 1 is used.

[0048] The peel detection label 1 shown in Fig. 1 is affixed to a box 2, which is an adherend, as shown in Fig. 3, for example, and is used as a means for detecting the opening of the box 2. The box 2 has two lids 4a, 4b, which are two adjacent members, on the top surface of a container portion 3 with an open top, and is opened by opening the lids 4a, 4b like double doors. Therefore, the space between the opposing sides when the lids 4a, 4b are closed becomes the opening portion 5 of the box 2.

[0049] When attaching the peel detection label 1 to such a box 2, the release paper 40 is peeled off to expose the adhesive layers 30a, 30b, and as shown in Fig. 3, the peel detection label 1 is attached to the box 2 by the adhesive layers 30a, 30b so as to straddle the two lids 4a, 4b and face the opening portion 5. In this case, the longitudinal direction of the peel detection label 1 is the direction in which the lids 4a, 4b are adjacent, and the lateral direction of the peel detection label 1 is perpendicular to the direction in which the lids 4a, 4b are adjacent.

[0050] In this way, the peel detection label 1 is stuck across the lids 4a and 4b, so that the box 2 cannot be opened unless the peel detection label 1 is peeled off.

[0051] <Basic function of peel detection label 1> Next, the basic operation when the peel detection label 1 attached to the box 2 as described above is peeled off from the box 2 will be described using an embodiment in which the adhesive layer 30 is made of one type of adhesive.

[0052] FIG. 4 is a cross-sectional view for explaining the basic action of peel detection label 1 shown in FIG. 1 when it is peeled off from box 2 in the case where it is used as shown in FIG.

[0053] When the peel detection label 1 shown in FIG. 1 is attached to the box 2 as described above, it is attached by the adhesive layer 30 so as to straddle the lids 4a and 4b of the box 2, as shown in FIG. 4(a). The peel detection label 1 has a base substrate 10 made of a transparent or translucent film, so that the back surface can be seen through from the front surface opposite the surface attached to the box 2. However, the release layer 20 laminated on the surface of the base substrate 10 attached to the box 2 is made of a release agent such as transparent silicone, and a colored adhesive layer 30 is laminated on the entire surface of the release layer 20 so as to cover it. As a result, only the color of the adhesive layer 30 is visible on the entire surface, and the latent image pattern created by the release layer 20 is not visible.

[0054] When attempting to peel off the peel detection labels 1 from this state, if the peel detection labels 1 have a longitudinal direction as described above, the peel detection labels 1 will be peeled off from one longitudinal end of the peel detection labels 1 due to the ease of peeling. Therefore, as shown in Figure 3, if the peel detection labels 1 are affixed to the box 2 so that their longitudinal direction is the direction in which the lids 4a and 4b are adjacent and their short sides are perpendicular to the direction in which the lids 4a and 4b are adjacent, the peel detection labels 1 will be peeled off in the direction in which the lids 4a and 4b are adjacent. In this case, even if the longitudinal direction of the peel detection labels 1 is slightly offset from the direction in which the lids 4a and 4b are adjacent, and therefore the short sides of the peel detection labels 1 are slightly offset from the direction perpendicular to the direction in which the lids 4a and 4b are adjacent, the peel detection labels 1 may be peeled off in the direction in which the lids 4a and 4b are adjacent.

[0055] When the peel detection label 1 attached to the box 2 is peeled from one end side in the longitudinal direction, as shown in Fig. 4(b), in the region where the peel layer 20 is not laminated, the adhesive layer 30 peels off from the lids 4a, 4b together with the base substrate 10. On the other hand, in the region where the peel layer 20 is laminated, the adhesive layer 30 is adhered to the lids 4a, 4b with a stronger adhesive force than the adhesive force to the peel layer 20, so the adhesive layer 30 peels off from the peel layer 20. Then, because the adhesive layer 30 is stretchable, the portion peeled off from the peel layer 20 peels off from the lids 4a, 4b together with the base substrate 10, breaks in a direction perpendicular to the lamination direction with the peel layer 20, and is pulled by the portion that remains laminated on the base substrate 10, so that it almost disappears from the region facing the peel layer 20.

[0056] When the peel detection label 1 is completely peeled off from the lids 4a and 4b, the adhesive layer 30 is present almost only in the area where the peel layer 20 is not laminated, as shown in FIG. 4(c).

[0057] FIG. 5 is a front view showing the state in which the peel detection label 1 shown in FIG.

[0058] When the peel detection label 1 shown in FIG. 1 is peeled from the box 2 as described above, when the peel detection label 1 is viewed from the opposite side of the base substrate 10 from the surface attached to the lids 4a and 4b, the color of the adhesive layer 30 is visible through the base substrate 10 in the area not facing the peel layer 20 due to the presence of the adhesive layer 30. On the other hand, in the area facing the peel layer 20, the adhesive layer 30 is no longer present, so the color of the adhesive layer 30 is no longer visible. As a result, a latent image pattern 6 due to the peel layer 20 is revealed, as shown in FIG. 5. Even if printing is applied to the entire surface or part of the base substrate 10, the color of the printing is visible in the area facing the peel layer 20, while a color corresponding to the printing color of the base substrate 10 and the color of the adhesive layer 30 is visible in the area not facing the peel layer 20, and the latent image pattern 6 due to the peel layer 20 is revealed. For example, if the base substrate 10 is printed in red and the adhesive layer 30 is green, a red latent image pattern 6 will appear on a black background resulting from the mixture of red and green.

[0059] Even if the peel detection label 1 on which the latent image pattern 6 has appeared is then reattached to the box 2, the adhesive layer 30 is no longer present in the area opposite the peel layer 20, so the latent image pattern 6 remains visible, making it possible to recognize that the peel detection label 1 has been fraudulently peeled off from the box 2 and the lids 4a, 4b have been fraudulently opened.

[0060] Furthermore, when the peel detection label 1 is peeled off after being stuck to the box 2, the area of ​​the adhesive layer 30 facing the peel layer 20 peels off from the peel layer 20 and breaks in a direction perpendicular to the lamination direction with the peel layer 20, so that when the peel detection label 1 is peeled off from the box 2, the adhesive layer 30 is all peeled off from the box 2 together with the base substrate 10. As a result, after the peel detection label 1 is peeled off from the box 2, no part of the peel detection label 1 remains on the box 2.

[0061] <Actions of the two adhesive layers 30a and 30b> Next, the effect of the adhesive layer 30 being composed of two adhesive layers 30a and 30b having different adhesive strengths will be described.

[0062] As described above, when the peel detection label 1 shown in Figure 1 is peeled off after being attached to an adherend such as a box 2, the portion of the adhesive layer 30 facing the peel layer 20 peels off from the peel layer 20 and breaks in a direction perpendicular to the lamination direction with the peel layer 20, and is stretched by being pulled by the portion not facing the peel layer 20, so that the adhesive layer 30 is almost completely absent in the area facing the peel layer 20.

[0063] However, depending on the adhesive strength to the adherend and the method of peeling from the adherend, the adhesive layer 30 may not stretch sufficiently, making it difficult for the portion facing the release layer 20 to break. In such cases, it may become impossible to leave any trace of the peeling from the adherend.

[0064] 1, the adhesive layer 30 is composed of two adhesive layers 30a, 30b with different adhesive strengths, as described above. The two adhesive layers 30a, 30b are arranged side by side in the longitudinal direction of the base substrate 10, and the two regions 7a, 7b with different adhesive strengths are adjacent to each other via a boundary line L1 (see FIG. 2) extending in the lateral direction of the base substrate 10.

[0065] FIG. 6 is a diagram for explaining the action of the two adhesive layers 30a and 30b of the peel detection label 1 shown in FIG.

[0066] When the peel detection label 1 configured as described above is attached across the lids 4a and 4b of the box 2 using the adhesive layers 30a and 30b as shown in Figure 6(a), and then peeled off in the longitudinal direction of the peel detection label 1 from the side of the region 7b where the adhesive layer 30b is laminated on the base substrate 10, depending on the adhesive strength to the lids 4a and 4b and the method of peeling off from the lids 4a and 4b, the adhesive layer 30b may not stretch sufficiently, and as shown in Figure 6(b), it may be difficult for the part opposite the peel layer 20 to break.

[0067] As the peel detection label 1 continues to be peeled from the lids 4a, 4b, the portion of the peel detection label 1 peeled from the lids 4a, 4b moves to region 7a defined by the adhesive layer 30a. The adhesive strength of adhesive layer 30a is stronger than the adhesive strength of adhesive layer 30b, and the adhesive strength of adhesive layer 30 to the lids 4a, 4b also increases. As a result, when an attempt is made to subsequently peel the peel detection label 1 from the lids 4a, 4b, the load acting as a peel force on the peel detection label 1 increases, acting strongly between the peel layer 20 and the adhesive layer 30a in region 7a. This makes it easier for the adhesive layer 30a to peel from the peel layer 20 in region 7a, as shown in FIG. 6(c).

[0068] As in the case shown in Figure 4, the portion of the adhesive layer 30a that has peeled off from the release layer 20 then peels off from the lids 4a, 4b together with the base substrate 10 because the adhesive layer 30a is elastic, breaks in a direction perpendicular to the lamination direction with the release layer 20, and is pulled by the portion that remains laminated on the base substrate 10, so that it almost no longer exists in the area facing the release layer 20.

[0069] 6(d), when the peel detection label 1 is completely peeled off from the lids 4a and 4b, in region 7b, the adhesive layer 30b does not peel off from the release layer 20, so that the adhesive layer 30b is also present in the region facing the release layer 20. On the other hand, in region 7a, as described above, the adhesive layer 30b peels off from the release layer 20 and breaks in a direction perpendicular to the lamination direction with the release layer 20, so that the adhesive layer 30b is almost absent in the region facing the release layer 20.

[0070] FIG. 7 is a surface view showing a state in which the effect of the two adhesive layers 30a, 30b is exerted when the peel detection label 1 shown in FIG.

[0071] 1 is attached to an adherend and then peeled from the region 7b side of the adhesive layer 30b with weaker adhesive strength, the adhesive layer 30 is more likely to peel from the release layer 20 in the region 7a with the adhesive layer 30a with stronger adhesive strength, even if the portion facing the release layer 20 is less likely to break due to the adhesive strength to the box 2 or the manner of peeling from the box 2. As a result, even if the portion of the adhesive layer 30b facing the release layer 20 is less likely to break due to the adhesive strength to the box 2 or the manner of peeling from the box 2 and the latent image pattern 6 is not manifested in the region 7b, the latent image pattern 6 due to the release layer 20 is more likely to appear in the region 7a with the adhesive layer 30a with stronger adhesive strength than the adhesive layer 30b, as shown in FIG.

[0072] Immediately after the portion of the peel detection label 1 that is peeled off from the lids 4a, 4b moves from region 7b to region 7a, the load applied to the peel detection label 1 as a peel force changes significantly, making it easier for the adhesive layer 30a to peel off from the peel layer 20. Therefore, in a region of region 7a along the boundary line L1 adjacent to region 7b, the latent image pattern 6 due to the peel layer 20 is likely to appear. Furthermore, in a region of region 7a along the boundary line L1 adjacent to region 7b, the latent image pattern 6 due to the peel layer 20 is also likely to appear in a region (part A in FIG. 7) along the edge extending in the longitudinal direction of the peel detection label 1.

[0073] 7, the latent image pattern 6 is not manifested at all in the region 7b, but the latent image pattern 6 may be manifested in patches. Even in this case, the latent image pattern 6 is clearly manifested in the region 7a, making it easier to detect that the peel detection label 1 has been peeled off from the box 2.

[0074] Thus, in this embodiment, even if the peeling layer 20 and the adhesive layer 30b are difficult to peel off due to the adhesive strength to the box 2 or the method of peeling off from the box 2, the adhesive layer 30a, which has a stronger adhesive strength than the adhesive layer 30b, adheres firmly to the adherend, and as the peel detection label 1 is subsequently peeled off from the adherend, the peeling detection label 1 is easily peeled off from the peeling layer 20. As a result, when the label is peeled off after being attached to the box 2, the latent image pattern 6 appears at least in the region 7a of the adhesive layer 30a, making it easy to detect the peeling. In this case, the adhesive strength to the adherend can be made different between the two regions 7a, 7b simply by using adhesives with different adhesive strengths.

[0075] Furthermore, although the peel detection label 1 has different adhesive strengths to the substrate in areas 7a and 7b in order to produce the above-mentioned effect, it is adhered to the substrate over its entire surface, so no part of it will roll up while adhered to the substrate.

[0076] In this embodiment, region 7a of adhesive layer 30a and region 7b having weaker adhesive strength than adhesive layer 30b are adjacent to each other via boundary line L1. This boundary line L1 extends in the shorter direction of base substrate 10 between two opposing end sides that extend in the longer direction of base substrate 10. However, if the label simply has region 7a of adhesive layer 30a and region 7b having weaker adhesive strength than adhesive layer 30b, when the portion peeling from the adherend moves from region 7b to region 7a, the load applied to the peel detection label as a peel force increases when the portion peeling from the adherend moves to region 7a, making it easier for adhesive layer 30a to peel from release layer 20.

[0077] (Second embodiment) <Configuration of Peel Detection Label 101> First, the configuration of the peel detection label in this embodiment will be described.

[0078] Fig. 8 shows a second embodiment of the label of the present invention, where (a) is a front view and (b) is a cross-sectional view taken along the line AA in (a). Fig. 9 shows the configuration of the back surface of the base substrate 10 in the peel detection label 101 shown in Fig. 8, where (a) is a view showing the configuration of the release layer 20 and (b) is a view showing the laminated surface with the release paper 40.

[0079] As shown in FIGS. 8 and 9, this embodiment is a peel detection label 101 that differs from that shown in FIGS. 1 and 2 in that the colored adhesive layer is composed of an adhesive layer 130 and a varnish layer 150.

[0080] The adhesive layer 130 in this embodiment is laminated over the entire surface of the base substrate 10 on which the release layer 20 is laminated, covering the release layer 20. The adhesive layer 130 is made of an elastic adhesive of any color, such as blue, red, or black, and is laminated by applying the adhesive to the entire surface of the base substrate 10 on which the release layer 20 is laminated. Since the base substrate 10 is made of a transparent or translucent film, the color of the adhesive layer 130 is visible from the surface of the base substrate 10. A release paper 40 is removably attached to the surface of the adhesive layer 130 opposite the release layer 20.

[0081] A strip-shaped varnish layer 150 containing a silicone component or the like is laminated on the adhesive surface of the adhesive layer 130 that adheres to the release paper 40, extending in the short direction of the base substrate 10. The varnish layer 150 is laminated by halftone printing of the varnish on the adhesive layer 130. As a result, the area of ​​the adhesive layer 130 where the varnish layer 150 is laminated is processed to reduce the adhesive strength of the adhesive surface that adheres to the adherend. Note that processing to reduce adhesive strength is not limited to halftone printing of a material that eliminates adhesive strength, such as varnish, but may also be applied in a striped or mesh pattern. Furthermore, the material that eliminates adhesive strength is not limited to varnish. Materials that have no adhesive strength, such as varnish, can also be used as the material that eliminates adhesive strength. With this configuration, the colored adhesive layer in this embodiment is composed of a first region 107a made up only of the adhesive layer 130, and a second region 107b having a weaker adhesive strength than region 107a due to a varnish layer 150 laminated on the adhesive layer 130. The varnish layer 150 is laminated in a strip shape extending in the short direction of the base substrate 10, so that region 107b is sandwiched between the two regions 107a via two boundary lines L2 and L3. The boundary lines L2 and L3 connect two opposing end sides of the base substrate 10 that extend in the longitudinal direction, parallel to each other in the short direction of the base substrate 10.

[0082] The varnish layer 150 is laminated on the adhesive surface of the adhesive layer 130 that is bonded to the release paper 40, but the varnish layer 150 may be configured to be embedded in the adhesive layer 130 when the release paper 40 is attached to the surface of the adhesive layer 130 on which the varnish layer 150 is laminated. In this case, the adhesive surface of the adhesive layer 130 that is bonded to the release paper 40 and the surface of the varnish layer 150 that faces the release paper 40 may be flat and have no steps.

[0083] <Effect of varnish layer 150> Next, the effect of laminating the varnish layer 150 on a part of the adhesive layer 130 will be described.

[0084] As described above, the peel detection label 101 shown in Fig. 8 is used by being stuck to the box 2 across the lids 4a and 4b as shown in Fig. 3, similar to the one shown in Fig. 1. When the label is subsequently peeled off from the box 2, the portion of the adhesive layer 130 facing the peel layer 20 peels off from the peel layer 20 and breaks in a direction perpendicular to the lamination direction with the peel layer 20, and is stretched by being pulled by the portion not facing the peel layer 20, so that the adhesive layer 130 is almost absent from the region facing the peel layer 20.

[0085] However, depending on the adhesive strength to the box 2 and the method of peeling from the box 2, the adhesive layer 130 may not stretch sufficiently, making it difficult for the portion facing the release layer 20 to break. In that case, it may become impossible to leave any trace that the adhesive layer has been peeled from the box 2.

[0086] 8, as described above, varnish is dot-printed on the adhesive surface of the adhesive layer 130 that adheres to the release paper 40, so that the varnish layer 150 is laminated in a strip shape that extends in the short direction of the base substrate 10. Then, because the varnish layer 150 is laminated in a strip shape on the adhesive layer 130, areas 107a and 107b having different adhesive strengths are adjacent to each other via two boundary lines L2 and L3 (see FIG. 9) that extend in the short direction of the base substrate 10, such that the area 107b with weak adhesive strength is sandwiched between the two areas 107a with strong adhesive strength.

[0087] FIG. 10 is a diagram for explaining the action of the varnish layer 150 of the peel detection label 101 shown in FIG.

[0088] When the peel detection label 101 configured as described above is attached across the lids 4a and 4b of the box 2 using the adhesive layer 130 as shown in Figure 10(a), and then peeled off in the longitudinal direction of the peel detection label 101 from one end of the base substrate 10 in the longitudinal direction, depending on the adhesive strength to the lids 4a and 4b and the method of peeling off from the lids 4a and 4b, the adhesive layer 130 may not stretch sufficiently, and as shown in Figure 10(b), it may be difficult for the part facing the peel layer 20 to break.

[0089] As the peel detection label 101 continues to be peeled from the lids 4a, 4b, the portion of the peel detection label 101 peeled from the lids 4a, 4b moves to the region 107b where the varnish layer 150 is laminated, and the adhesive force to the box 2 temporarily changes from a strong adhesive force in the region 107a to a weak adhesive force in the region 107b. Then, as the peel detection label 101 continues to be peeled from the lids 4a, 4b, and the portion of the peel detection label 101 peeled from the lids 4a, 4b moves to the region 107a where the varnish layer 150 is not laminated, the adhesive force to the box 2 changes from a weak adhesive force in the region 107b to a strong adhesive force in the region 107a. As a result, when an attempt is made to subsequently peel the peel detection label 101 from the lids 4a, 4b, the load applied to the peel detection label 101 as a peel force again increases in the portion where the adhesive force to the box 2 becomes strong again, and acts strongly between the peel layer 20 and the adhesive layer 130. This makes it easier for the adhesive layer 130 to peel from the release layer 20 in the region 107a, as shown in FIG. 10(c).

[0090] Then, as in the case shown in Figure 4, the portion of the adhesive layer 130 that has peeled off from the release layer 20 then peels off from the lids 4a, 4b together with the base substrate 10 because the adhesive layer 130 is elastic, breaks in a direction perpendicular to the lamination direction with the release layer 20, and is pulled by the portion that remains laminated on the base substrate 10, so that it almost no longer exists in the area facing the release layer 20.

[0091] 10(d), in the region 107b where the varnish layer 150 is laminated, the adhesive layer 130 does not peel off from the release layer 20, and therefore the adhesive layer 130 is present in the region facing the release layer 20. Also, in the region 107a where the varnish layer 150 is not laminated, the adhesive layer 130 does not peel off from the release layer 20, and therefore the adhesive layer 130 is present in the region facing the release layer 20 in the region upstream of the region 107b in the peeling direction from the lids 4a and 4b. On the other hand, in the region of the region 107a downstream of the region 107b in the peeling direction from the lids 4a and 4b, as described above, the adhesive layer 130 peels off from the release layer 20 and breaks in a direction perpendicular to the lamination direction with the release layer 20, and is almost absent in the region facing the release layer 20.

[0092] FIG. 11 is a surface view showing the state in which the effect of the varnish layer 150 is produced when the peel detection label 101 shown in FIG. 8 is peeled off from the box 2.

[0093] 8 is peeled from one end side in the longitudinal direction of the base substrate 10, even if the phenomenon of the portion facing the release layer 20 breaking due to the adhesive strength with the box 2 or the manner of peeling from the box 2 is unlikely to occur, the adhesive layer 130 is likely to peel from the release layer 20 in a region of the region 107a where the varnish layer 150 is not laminated that is downstream of the region 107b in the peeling direction from the box 2. As a result, even if the phenomenon of the portion of the adhesive layer 130 facing the release layer 20 breaking due to the adhesive strength with the box 2 or the manner of peeling from the box 2 is unlikely to occur and the latent image pattern 6 is unlikely to appear, the latent image pattern 6 by the release layer 20 is likely to appear in a region of the region 107a that is downstream of the region 107b in the peeling direction from the box 2, as shown in FIG.

[0094] Thus, in this embodiment, even if the release layer 20 and the adhesive layer 130 are difficult to peel off due to the adhesion strength to the box 2 or the method of peeling from the box 2, the adhesive layer 130 is easily peeled off from the release layer 20 in the region 107a where the varnish layer 150 is not laminated, which is downstream of the region 107b in the peeling direction from the box 2. As a result, when the sheet is peeled off after being attached to the box 2, the latent image pattern 6 appears at least in the region 107a where the varnish layer 150 is not laminated, which is downstream of the region 107b in the peeling direction from the box 2, making the peeling easier to detect. In this case, the adhesion strength to the adherend can be made weaker in the region 107b than in the region 107a without using adhesives with different adhesion strengths in the region 107a with strong adhesion and the region 107b with weak adhesion. In addition, by applying a general process such as halftone printing to the adhesion surface of region 107b to the adherend without using any special process to reduce the adhesive strength, the adhesive strength of region 107b to the adherend can be made weaker than that of region 107a.

[0095] As described above, when the peel detection label 101 is peeled from the lids 4a and 4b, the adhesive strength in the region 107b is weak, so that the load applied to the peel detection label 101 as a peel force is small. As a result, when the width W0 (see FIG. 9) of the region 107b in the longitudinal direction of the peel detection label 101 is wider, the load applied to the peel detection label 101 as a peel force is sufficiently small, and after the peel detection label 101 becomes slightly bent, the portion peeled off from the lids 4a and 4b moves to the region 107a. Therefore, when the width W0 (see FIG. 9) of the region 107b in the longitudinal direction of the peel detection label 101 is wider, the latent image pattern 6 of the peel layer 20 becomes more likely to appear.

[0096] Furthermore, in this embodiment, the region 107b is sandwiched between the two regions 107a via two boundary lines L2 and L3 that extend parallel to each other in the short direction of the base substrate 10 between two opposing end sides that extend in the longitudinal direction of the base substrate 10. As a result, the region 107b is a rectangle having two opposing end sides that extend in the longitudinal direction of the base substrate 10 as its two sides. However, the region 107b may be a rectangle that does not have two opposing end sides that extend in the longitudinal direction of the base substrate 10 as its two sides, i.e., the boundary lines L2 and L3 may not extend to the end sides of the base substrate 10. However, the latent image pattern 6 by the release layer 20 is more likely to appear when the boundary lines L2 and L3 extend to the end sides of the base substrate 10.

[0097] The configurations of the two embodiments described above may also be combined. For example, in a configuration in which two regions 7a, 7b with different adhesive strengths to the adherend are aligned in the longitudinal direction of the base substrate 10 as shown in Figure 1, an adhesive layer 30 may be laminated using a single type of adhesive over the entire surface of the base substrate 10 on which the release layer 20 is laminated, and the varnish layer 150 shown in Figure 8 may be laminated only on the region 7b above it. Also, in a configuration in which the region 107b with weak adhesive strength is sandwiched between two regions 107a with strong adhesive strength as shown in Figure 8, the varnish layer 150 may not be used, and the adhesive layer constituting the region 107b may be formed using an adhesive with weaker adhesive strength than the adhesive layer constituting the region 107a.

[0098] (Third embodiment) <Configuration of Peel Detection Label 201> First, the configuration of the peel detection label in this embodiment will be described.

[0099] Fig. 12 shows a third embodiment of the label of the present invention, where (a) is a front view and (b) is a cross-sectional view taken along the line AA in (a). Fig. 13 shows the configuration of the back surface of the base substrate 10 in the peel detection label 201 shown in Fig. 12, where (a) is a view showing the configuration of the release layer 20 and (b) is a view showing the laminated surface with the release paper 40.

[0100] As shown in FIGS. 12 and 13, this embodiment is a peeling detection label 201 in which the shape of the second region 207b is different from that shown in FIGS.

[0101] 12 and 13, the peel detection label 201 of this embodiment, like that shown in the second embodiment, has a varnish layer 250 laminated by halftone printing of varnish on the adhesive surface of the adhesive layer 130 that adheres to the release paper 40. As a result, the area of ​​the adhesive layer 130 where the varnish layer 250 is laminated is processed to reduce the adhesive strength of the surface that adheres to the adherend. As a result, the colored adhesive layer in this embodiment is also composed of a first area 207a made up of only the adhesive layer 130, and a second area 207b where the varnish layer 250 is laminated on the adhesive layer 130 and has a weaker adhesive strength than area 207a.

[0102] The varnish layer 250 is layered in a shape consisting of a rectangle and a trapezoid lined up in the longitudinal direction of the base substrate 10. The long side of this rectangle connects the two end sides extending in the longitudinal direction of the base substrate 10. The bottom base of the trapezoid connects the two end sides extending in the longitudinal direction of the base substrate 10. The trapezoids are lined up so that the bottom base of the trapezoid overlaps one side of the rectangle. As a result, the region 207b is sandwiched between the two regions 207a via the two boundary lines L4 and L5. The boundary line L4 is the long side of the rectangle connecting the two end sides extending in the longitudinal direction of the base substrate 10, and is therefore a straight line extending in the short direction of the base substrate 10. The boundary line L5 is the upper base and leg of the trapezoid, and is therefore composed of a main side L5a extending parallel to the boundary line L4 in the short direction of the base substrate 10, and two sub-sides L5b extending obliquely from both ends of the main side L5a toward the boundary line L4 so as to move away from each other. The two sub-sides L5b each reach two end sides extending in the longitudinal direction of the base substrate 10.

[0103] <Effect of varnish layer 250> Next, the effect of laminating the varnish layer 250 in the shape described above on a part of the adhesive layer 130 will be described.

[0104] As described above, the peel detection label 201 shown in Fig. 12 is used by being stuck to the box 2 across the lids 4a and 4b as shown in Fig. 3, similar to the one shown in Fig. 1. When the label is subsequently peeled off from the box 2, the portion of the adhesive layer 130 facing the peel layer 20 peels off from the peel layer 20 and breaks in a direction perpendicular to the lamination direction with the peel layer 20, and is stretched by being pulled by the portion not facing the peel layer 20, so that the adhesive layer 130 is almost absent from the region facing the peel layer 20.

[0105] However, depending on the adhesive strength to the box 2 and the method of peeling from the box 2, the adhesive layer 130 may not stretch sufficiently, making it difficult for the portion facing the release layer 20 to break. In that case, it may become impossible to leave any trace that the adhesive layer has been peeled from the box 2.

[0106] 12, as described above, the second region 207b is sandwiched between two first regions 207a having stronger adhesive strength than the second region 207b, with two boundary lines L4 and L5 interposed between them. One of the two boundary lines L4 and L5, the boundary line L4, extends in the lateral direction of the base substrate 10 between two end sides extending in the longitudinal direction of the base substrate 10. The other boundary line L5 of the two boundary lines L4 and L5 is composed of a main side L5a extending in the lateral direction of the base substrate 10 and two sub-sides L5b that extend obliquely from both ends of the main side L5a toward the boundary line L4 so as to move away from each other and reach the two end sides extending in the longitudinal direction of the base substrate 10.

[0107] FIG. 14 is a diagram for explaining the action of the varnish layer 250 of the peel detection label 201 shown in FIG.

[0108] After the peel detection label 201 configured as described above is attached to the box 2 shown in Fig. 3, when the peel detection label 201 is peeled in the longitudinal direction from the boundary line L4 side of the two boundary lines L4, L5, the portion being peeled from the box 2 moves to the second region 207b, and then the width of the second region 207b peeled from the box 2 gradually narrows from W1 to W2, as shown in Fig. 14. As a result, particularly when the peeling portion moves from the second region 207b to the portion that will become the first region 207a via the main side L5a of the boundary line L5, the load applied to the label as a peel force is concentrated and acts between the peel layer 20 and the adhesive layer 130.

[0109] FIG. 15 is a surface view showing the state in which the effect of the varnish layer 250 is exerted when the peel detection label 201 shown in FIG. 12 is peeled off from the adherend.

[0110] As described above, when the peeling portion moves from the second region 207b to the portion that becomes the first region 207a via the main edge L5a of the boundary line L5, the load applied to the label as a peeling force is concentrated and acts between the peeling layer 20 and the adhesive layer 130.

[0111] Therefore, as the peel detection label 201 continues to be peeled off from the box 2, the peel layer 20 is more likely to peel off from the adhesive layer 130 in the first region 207a. As a result, even if the phenomenon of the portion of the adhesive layer 130 facing the peel layer 20 breaking due to the adhesive strength with the adherend or the manner of peeling from the adherend is less likely to occur and the latent image pattern 6 is not manifested, the latent image pattern 6 due to the peel layer 20 is more likely to manifest in the first region 207a on the boundary line L5 side, as shown in Fig. 15. At this time, the load applied to the label as the peel force is particularly concentrated in the region of the first region 207a along the main side L5a of the boundary line L5 (part B in Fig. 15), and the latent image pattern 6 due to the peel layer 20 is more likely to manifest.

[0112] Thus, in this embodiment as well, even if the peeling layer 20 and the adhesive layer 130 are difficult to peel from each other due to the adhesive strength with respect to the adherend or the method of peeling from the adherend, the load applied to the label as the peeling force is concentrated in the first region 207a on the boundary line L5 side, making it easier for the peeling layer 20 to peel from the adhesive layer 130. As a result, when the label is peeled off after being stuck to the adherend, the latent image pattern 6 appears at least in the first region 207a on the boundary line L5 side, making it easier to detect the peeling.

[0113] (Fourth embodiment) <Configuration of Peel Detection Label 301> First, the configuration of the peel detection label in this embodiment will be described.

[0114] Fig. 16 shows a fourth embodiment of the label of the present invention, where (a) is a front view and (b) is a cross-sectional view taken along the line AA in (a). Fig. 17 shows the configuration of the back surface of the base substrate 10 in the peel detection label 301 shown in Fig. 16, where (a) is a view showing the configuration of the release layer 20 and (b) is a view showing the laminated surface with the release paper 40.

[0115] As shown in FIGS. 16 and 17, this embodiment is a peel detection label 301 that differs from the label shown in FIGS. 8 and 9 in that a plurality of varnish layers 350a to 350d are laminated on the adhesive layer 130.

[0116] In this embodiment, a plurality of varnish layers 350a to 350d are laminated on the adhesive surface of the adhesive layer 130 that adheres to the release paper 40. Each of the varnish layers 350a to 350d is laminated by halftone printing of varnish on the adhesive layer 130, similar to that shown in Figures 8 and 9, and is laminated in the form of a strip extending in the shorter direction of the base substrate 10. The varnish layers 350a to 350d are arranged side by side in the longitudinal direction of the base substrate 10, from the longitudinal center of the base substrate 10 to one end in the longitudinal direction. The varnish layers 350a to 350d have different widths. Specifically, the width W3 of the varnish layer 350a located closest to the center of the base substrate 10 in the longitudinal direction is the narrowest, the width W4 of the varnish layer 350b adjacent to the varnish layer 350a is the widest, the width W5 of the varnish layer 350c adjacent to the varnish layer 350b on the opposite side of the varnish layer 350a is the second narrowest, and the width W6 of the varnish layer 350d adjacent to the varnish layer 350c on the opposite side of the varnish layer 350b is the second widest. The spacing between the varnish layers 350a and 350b, the spacing between the varnish layers 350b and 350c, and the spacing between the varnish layers 350c and 350d may be different from one another. The colored adhesive layer in this embodiment is configured in this way, and is composed of a first region 307a composed only of the adhesive layer 130, and a second region 307b having weaker adhesive strength than the region 307a by laminating the varnish layers 350a to 350d on the adhesive layer 130. The varnish layers 350a to 350d are arranged side by side in the longitudinal direction of the base substrate 10, and thus the multiple regions 307b are arranged side by side in the longitudinal direction of the base substrate 10, with the regions 307a and 307b forming stripes in the longitudinal direction of the base substrate 10. The multiple regions 307b have different widths in the longitudinal direction of the base substrate 10.

[0117] <Effect of varnish layers 350a to 350d> Next, the effect of laminating the varnish layers 350a to 350d on the adhesive layer 130 will be described.

[0118] 1, the peel detection label 301 in this embodiment is used by being attached to the box 2 across the lids 4a and 4b as shown in Fig. 3. When the label is subsequently peeled off from the box 2, the portion of the adhesive layer 130 facing the peel layer 20 peels off from the peel layer 20 and breaks in a direction perpendicular to the lamination direction with the peel layer 20, and is stretched by being pulled by the portion not facing the peel layer 20, so that the adhesive layer 130 is almost absent from the region facing the peel layer 20.

[0119] However, depending on the adhesive strength to the box 2 and the method of peeling from the box 2, the adhesive layer 130 may not stretch sufficiently, making it difficult for the portion facing the release layer 20 to break. In that case, it may become impossible to leave any trace that the adhesive layer has been peeled from the box 2.

[0120] As described above, the peel detection label 301 shown in Figure 16 has varnish layers 350a to 350d arranged in a line in the longitudinal direction of the base substrate 10 on the adhesive surface of the adhesive layer 130 that is attached to the release paper 40, so that multiple areas 307b are arranged in a line in the longitudinal direction of the base substrate 10, and the areas 307a, 307b with different adhesive strengths are arranged in a striped pattern in the longitudinal direction of the base substrate 10.

[0121] 3, the peel detection label 201 is attached across the lids 4a and 4b of the box 2, and then peeled from one longitudinal end of the base substrate 10 in the longitudinal direction of the peel detection label 301. When the portion of the peel detection label 301 peeled from the lids 4a and 4b moves to the region 307b where the varnish layer 350a is laminated, the adhesive strength to the box 2 temporarily changes from the strong adhesive strength in region 307a to a weak adhesive strength. Then, as the peel detection label 301 continues to be peeled from the lids 4a and 4b and the portion of the peel detection label 301 peeled from the lids 4a and 4b moves to the region 307a where the varnish layer 350a is not laminated, the adhesive strength to the box 2 changes from the weak adhesive strength in region 307b to a strong adhesive strength. As a result, when an attempt is made to subsequently peel the peel detection label 301 from the lids 4a and 4b, the load applied to the peel detection label 301 as a peel force becomes large again in the portion where the adhesive force to the box 2 becomes strong again, and acts strongly between the peel layer 20 and the adhesive layer 130. This makes it easier for the adhesive layer 130 to peel from the peel layer 20.

[0122] Then, as in the case shown in Figure 4, the portion of the adhesive layer 130 that has peeled off from the release layer 20 then peels off from the lids 4a, 4b together with the base substrate 10 because the adhesive layer 130 is elastic, breaks in a direction perpendicular to the lamination direction with the release layer 20, and is pulled by the portion that remains laminated on the base substrate 10, so that it almost no longer exists in the area facing the release layer 20.

[0123] This effect is likely to occur in the regions 307a adjacent to the region 307b where the varnish layers 350a to 350d are laminated, on the downstream side in the peeling direction of the peel detection label 301. As a result, even if the phenomenon of the portion of the adhesive layer 130 facing the peeling layer 20 breaking due to the adhesive strength with the box 2 or the manner of peeling from the box 2 is unlikely to occur and the latent image pattern is unlikely to appear, the latent image pattern due to the peeling layer 20 is likely to appear in the region of the region 307a downstream in the peeling direction from the box 2 relative to the region 307b.

[0124] Thus, in this embodiment, even if the release layer 20 and the adhesive layer 130 are difficult to peel off due to the adhesive strength to the box 2 or the method of peeling from the box 2, the adhesive layer 130 is easily peeled off from the release layer 20 in the region 307a where the varnish layers 350a to 350d are not laminated, which is downstream of the region 307b in the peeling direction from the box 2. As a result, when the base substrate 10 is peeled off after being attached to the box 2, a latent image pattern appears at least in the region 207a where the varnish layers 350a to 350d are not laminated, which is downstream of the region 207b in the peeling direction from the box 2, making the peeling easier to detect. In this case, the regions 307a and 307b, which have different adhesive strengths, are arranged in a striped pattern in the longitudinal direction of the base substrate 10, which increases the region where the latent image pattern is easily revealed. Furthermore, if the widths of the varnish layers 350a to 350d are different from each other, even if it is known that there is a difference in adhesive strength between areas 207a and 207b, it becomes difficult to adjust the force used when peeling the peel detection label 301 from the substrate so that the adhesive layer 130 does not peel off from the peel layer 20, making it easier for the latent image pattern to appear.

[0125] The shape of the region 207b in this embodiment may be the same as the shape of the region 107b shown in the third embodiment.

[0126] Furthermore, in the third and fourth embodiments described above, the adhesive strength of the regions 207b, 307b is made weaker than that of the regions 207a, 307a by laminating the varnish layers 250, 350a-350d on the adhesive layer 130 of the regions 207b, 307b. However, as in the first embodiment, the adhesive layer constituting the regions 207b, 307b may be made using an adhesive having a weaker adhesive strength than the adhesive layer constituting the regions 207a, 307a, thereby making the adhesive strength of the regions 207b, 307b weaker than that of the regions 207a, 307a.

[0127] (Other embodiments) In the second to fourth embodiments described above, varnish is dot-printed on the adhesive surface of the adhesive layer 130 that adheres to the release paper 40, and the varnish layers 150, 250, 350a-350d are laminated. As a result, the adhesive strength of the second regions 107b, 207b, 307b on which the varnish layers 150, 250, 350a-350d are laminated is weaker than the adhesive strength of the first regions 107a, 207a, 307a on which the varnish layers 150, 250, 350a-350d are not laminated. However, the varnish may be laminated by so-called solid printing, thereby eliminating the adhesive strength of the second regions 107b, 207b, 307b on which the varnish layers are laminated. Even in this case, if the peel detection label is peeled off after being attached to box 2 as shown in Fig. 3, and the portion that separates from box 2 moves from the second region where a layer of varnish is laminated due to solid printing of varnish to the first region where no varnish layer is laminated, the load applied to the peel detection label to separate from box 2 acts greatly between peel layer 20 and adhesive layer 130 in the first region. This makes it easier for adhesive layer 130 to peel off from peel layer 20 in the first region, and a latent image pattern appears, allowing peeling to be detected. [Explanation of symbols]

[0128] 1,101,201,301 Peel detection label 2 boxes 3 Container part 4a,4b Lid 5 Unpacked part 6 Latent Image Pattern 7a,7b,107a,107b,207a,207b,307a,307b area 10 Base material 20 Peeling layer 30,30a,30b,130 Adhesive layer 40 Release paper 150, 250, 350a~350d varnish layer L1~L5 boundary line L5a main side L5b side edge

Claims

1. A label that reveals a latent image pattern when peeled off after being attached to an adherend, A base substrate; a release layer laminated on one surface of the base material in the shape of the latent image pattern; a colored adhesive layer laminated over the entire surface of the base substrate on which the release layer is laminated, covering the release layer; The colored adhesive layer is a first region having a first adhesive force with respect to the adherend; and a second region having a second adhesive strength to the adherend that is weaker than the first adhesive strength.

2. The label of claim 1, A label, wherein the first region and the second region are adjacent to each other via a boundary line connecting two opposing end sides of the label.

3. The label according to claim 2, A label in which the second region is sandwiched between two of the first regions via two boundary lines extending parallel to each other.

4. The label of claim 1, the second region is sandwiched between two of the first regions via two boundary lines, One of the two boundary lines is The label is formed by connecting two opposing end sides of the label, The other of the two boundary lines is a main side extending parallel to the one boundary line; A label having two sub-sides extending obliquely from both ends of the main side toward the one boundary line so as to move away from each other and reach the end side.

5. The label of claim 1, The second region has a surface that is applied with a treatment to reduce adhesive strength to the adherend.

6. The label according to claim 5, The second region of the label has a dot-printed material on the surface that adheres to the adherend to eliminate adhesive force.

7. A label that reveals a latent image pattern when peeled off after being attached to an adherend, A base substrate; a release layer laminated on one surface of the base material in the shape of the latent image pattern; a colored adhesive layer laminated over the entire surface of the base substrate on which the release layer is laminated, covering the release layer; The colored adhesive layer is a first region having adhesive force to the adherend; A label having a second region that does not have adhesive strength to the substrate.

Images