JP2012058529A - Opening identification label - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an opening identification label capable of confirming history as to whether or not a label is exfoliated with another sensation (especially tactile sensation) in addition to the visual sense.SOLUTION: The opening identification label comprises a base material part equipped with at least an exfoliation layer formed by applying printing by a release agent to one face of a transparent surface sheet, and an adhesion part which is laminated on the face on the exfoliation layer side of the base material part and stuck to the face to be adhered. The adhesion part is formed by laminating a plurality of adhesive agents having different adhesive force, and as for the adhesive force of the plurality of the adhesive agents, the adhesive force of the adhesive agent located on the base material part side is stronger than that of the release agent located on the face to be adhered.

Description

  The present invention relates to an unsealing identification label for identifying presence / absence of unsealing or fraud.

  In recent years, opening identification labels have been used for information management and opening identification of products and the like. With this unsealing identification label, when the unsealing identification label attached to the unsealing part of the article or product container to be managed is peeled off, the pattern such as `` opened '' remains on the adherend surface of the unsealing part, These letters and other patterns appear on the surface of the opened identification label from which they have been peeled off. As described above, the opening identification label has a function of visually recognizing the history of peeling the label, that is, the history of opening the article or product to be managed.

  As such an opening identification label, Patent Document 1 by the present inventor includes a transparent surface layer, an opaque intermediate layer made of aluminum, and a release agent layer that forms a pattern such as characters between the surface layer and the intermediate layer. The anti-voyeurism label which laminated | stacked the base material which becomes and adhere | attached the intermediate | middle layer of a base material, and the adhesive layer for sticking on a to-be-adhered surface is described. When the anti-voyeurism label attached to the adherend surface is peeled, the pattern of the release agent layer is visually recognized from the surface layer side of the label, and the history of peeling the label can be confirmed.

JP 2008-242188 A

  However, for the conventional opening identification label including the anti-voyeurism label of Patent Document 1, the history confirmation as to whether or not the label has been peeled depends only on the sight from the surface side of the label. Therefore, there is a problem that confirmation cannot be sufficiently performed under the condition of poor visibility. In addition, there is a problem that these labels are not compatible with the use of visually impaired people.

  The present invention has been devised in view of the above-described points, and the purpose of the present invention is to open a history in which whether or not a label has been peeled can be confirmed by visual sense as well as by another sense (especially tactile sense). To provide an identification label.

  In order to solve the above problems, the unsealing identification label of the present invention comprises a base material portion comprising at least a release layer printed on one surface of a transparent surface sheet with a release agent, and a surface on the release layer side of the base material portion. It is an unsealing identification label that is laminated on and is composed of an adhesive part that is attached to the adherend surface, and the adhesive part is formed by laminating a plurality of adhesives having different adhesive forces. The adhesive strength of the adhesive is greater for the adhesive disposed on the substrate portion side than for the adherend surface side.

  The unsealing identification label of the present invention is used by being attached to an adherend surface of an object with an adhesive that constitutes an attaching portion. When the label once attached to the adherend surface is peeled off, the layer that is in contact with the peelable layer constituting the base material portion is pulled by the sticking portion adhering to the adherend surface and peeled off from the peelable layer. In addition, voids are generated between them. And since the adhesive arranged on the base part side has a larger adhesive force than the adhesive arranged on the adherend side, the adhesive on the adherend side adheres firmly to the base part. It is pulled by the adhesive on the base material part side and peeled off from the adherend surface. When the pressure-sensitive adhesive constituting the sticking portion is peeled off from the adherend surface, the sticking portion is formed in an uneven shape in order to contract and round after being stretched by its elasticity. Therefore, if the peeled open identification label is again attached to the surface to be adhered, etc., the surface sheet can be touched with fingers, etc., and irregularities caused by rounded adhesive or voids can be confirmed by touch. it can.

  Furthermore, since the opening identification label of the present invention once pasted and peeled off creates a gap between the peeling layer of the base material portion and the layer in contact with the peeling layer, the base material portion is peeled off. There is no return to the previous state. Therefore, once the label is pasted and peeled off, the printed pattern of the release layer appears on the top sheet, and even if it is stuck on the adherend surface again, the pattern that appears on the top sheet is not lost.

  Thus, the opening identification label of this invention can confirm the log | history of whether the label was peeled off both visually and visually.

  Further, the sticking part is composed of a first pressure-sensitive adhesive layer that adheres to the base part and a second pressure-sensitive adhesive layer that adheres to the adherend surface, and the pressure-sensitive adhesive force of the pressure-sensitive adhesive constituting the first pressure-sensitive adhesive layer is first. It is preferable that it is larger than the adhesive force of the adhesive which comprises 2 adhesive layers. By forming the sticking part from two layers of adhesive, the unsealing identification label of the present invention can have a simple configuration.

  Further, the opening identification label of the present invention is attached to the adherend surface by the second pressure-sensitive adhesive layer. When the opening identification label of the present invention once adhered is peeled off, the second identification label is adhered to the adherend surface. 2 The adhesive layer is stretched by elasticity. However, since the intermolecular force of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer is weakened along with the elongation, the pressure-sensitive adhesive force of the pressure-sensitive adhesive gradually decreases. Here, since the adhesive which comprises a 1st adhesive layer has a larger adhesive force than the adhesive which comprises a 2nd adhesive layer, the 2nd adhesive layer adhered firmly with the base-material part. It is pulled by the first pressure-sensitive adhesive layer and peeled off from the adherend surface. Thus, the opening identification label of the present invention is peeled off with the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer hardly remaining on the adherend surface.

  And when peeling the opening identification label of this invention, while a space | gap arises between the peeling layer which comprises a base material part, and the layer which is contacting the said peeling layer, the 1st which comprises an adhesion part. Since the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer is stretched and then contracted and rounded, the sticking portion is formed in an uneven shape. Therefore, if the peeled open identification label is again attached to the surface to be adhered, etc., the surface sheet can be touched with fingers, etc., and irregularities caused by rounded adhesive or voids can be confirmed by touch. In addition, the printed pattern of the release layer appearing on the top sheet can be visually confirmed. Therefore, the history of whether or not the label has been peeled can be confirmed by tactile sensation and vision.

  Furthermore, it is also preferable that the second adhesive layer has a peel strength of 10 N / 25 mm or less with respect to the stainless steel plate. When the label of the present invention is peeled off, a suitable range of pressure-sensitive adhesive strength is selected such that the second pressure-sensitive adhesive layer is hardly left on the adherend surface. Therefore, not only is it not necessary to remove the pressure-sensitive adhesive remaining on the adherend surface, but also the pressure-sensitive adhesive constituting the first pressure-sensitive adhesive layer and the second pressure-sensitive adhesive layer shrinks and returns to the base material portion side. The unevenness caused by the adhesive or the like can be confirmed by touch.

According to the present invention, it is possible to provide an unsealing identification label having the following excellent effects.
(1) The history of whether or not the attached unsealing identification label has been peeled can be confirmed by touching the surface sheet, that is, by touch.
(2) The history of whether or not the attached unsealing identification label has been peeled can be confirmed by looking at the top sheet, that is, visually.
(3) When the attached unsealing identification label is peeled from the adherend surface, no adhesive or the like remains on the adherend surface.
(4) Since it has a simple structure, it is easy to manufacture and can be manufactured at low cost.

It is sectional drawing which shows the state which affixed the opening identification label which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the state which peels the opening identification label which concerns on the 1st Embodiment of this invention (a), (b) It is sectional drawing which shows the state which peels further. It is sectional drawing which shows the state after peeling of the opening identification label which concerns on the 1st Embodiment of this invention. It is sectional drawing which shows the state which affixed the opening identification label which concerns on the 2nd Embodiment of this invention. It is sectional drawing which shows the state which peels (a) the peeling identification label which concerns on the 2nd Embodiment of this invention, (b) It is sectional drawing which shows the state which peels further.

  Hereinafter, a first embodiment of the present invention will be described.

  As shown in FIG. 1, the opening identification label 1 of the present embodiment includes a base material portion 2 composed of three layers of a transparent surface sheet 21, a release layer 22 and an opaque layer 23, a first pressure-sensitive adhesive layer 31, and The adhesive part 3 comprised from two layers of the 2nd adhesive layer 32 is provided. The sticking part 3 is laminated | stacked on the base material part 2 so that the 1st adhesive layer 31 may contact | connect the surface by the side of the opaque layer 23 of the base material part 2. FIG.

  First, the base material part 2 is demonstrated. The base material part 2 is provided with the transparent surface sheet 21 used as a label support body. The surface sheet 21 is made of a polymer film, and the material is not particularly limited. However, polypropylene, polyester, polyethylene terephthalate, polystyrene, polyimide, polyvinyl chloride, or the like is desirable. Further, the thickness of the surface sheet 21 can be confirmed by touching the surface sheet 21 from the viewpoint of facilitating handling such as sticking or peeling of the opening identification label 1 and the unevenness generated when the opening identification label 1 is peeled off. In view of the above, it is preferably 10 μm to 100 μm, more preferably 20 μm to 60 μm, and particularly preferably 25 μm to 50 μm.

  Next, the release layer 22 is formed on one surface of the topsheet 21 by printing with a release agent. Various designs such as characters and figures such as “opened” and “VOID” can be selected as the printing pattern by the release agent. The release agent used is not particularly limited, and silicon resin, Teflon (registered trademark), or the like is used.

  Furthermore, the opaque layer 23 is provided as what comprises the base material part 2 concerning this embodiment shown in FIG. Specifically, the opaque layer 23 is formed by subjecting the surface sheet 21 on which the release layer 22 is formed, to the side on which the release layer 22 is formed, by performing aluminum vapor deposition or printing with an opaque paint. As shown in FIG. 2, the release layer 22 is peeled off from the opaque layer 23 pulled by the adhesive layer 3 described below, and a void 4 is formed, whereby the surface sheet 21 of the opening identification label 1 is opened. Characters, figures, etc. showing that appear.

  Next, the sticking part 3 will be described. The sticking part 3 according to the present embodiment is formed by laminating a first pressure-sensitive adhesive layer 31 and a second pressure-sensitive adhesive layer 32. The first pressure-sensitive adhesive layer 31 is disposed between the opaque layer 23 and the second pressure-sensitive adhesive layer 32 of the base material part 2 and adheres to both layers. The material of the pressure-sensitive adhesive composing the first pressure-sensitive adhesive layer 31 is appropriately selected from acrylic resin, urethane resin, rubber resin, or silicon resin made of acrylic acid ester or methacrylic acid ester. The agent is suitably selected.

  About the adhesive which comprises the 1st adhesive layer 31, from the viewpoint of not leaving the adhesive which comprises the adhesion part 3 on the to-be-adhered surface 5, when peeling the once opened opening identification label 1, A material having a larger adhesive force than the pressure-sensitive adhesive constituting the second pressure-sensitive adhesive layer 32 is selected. And the adhesive force of the adhesive which comprises the 1st adhesive layer 31 specifically, the 1st adhesive layer 31 peels from the opaque layer 23, and the 1st adhesive layer 31 and the 2nd adhesive under it From the viewpoint of preventing the layer 32 from remaining on the adherend surface 5 and firmly adhering the second pressure-sensitive adhesive layer 32 to the first pressure-sensitive adhesive layer 31, 180 degrees with respect to the stainless steel test plate defined in JIS Z 0237. The peel adhesion is preferably greater than 10 N / 25 mm, and more preferably greater than 15 N / 25 mm. Moreover, if the thickness of the 1st adhesive layer 31 is too thick, the stress which pulls the peeling layer 22 and peels will disperse | distribute and it will become insufficient peeling, and if too thin, the adhesive force with the opaque layer 23 and the 2nd adhesive layer 32 will be sufficient. From the viewpoint of insufficient, the thickness of the first pressure-sensitive adhesive layer 31 is preferably 5 μm to 50 μm, and more preferably 10 μm to 30 μm.

  The second pressure-sensitive adhesive layer 32 is laminated by adhering to the first pressure-sensitive adhesive layer 31, and the opening identification label 1 is adhered to the adherend surface 5 by the second pressure-sensitive adhesive layer 32. The material of the pressure-sensitive adhesive composing the second pressure-sensitive adhesive layer 32 is appropriately selected from acrylic resin, urethane resin, rubber resin, or silicon resin made of acrylic acid ester or methacrylic acid ester. The agent is suitably selected.

  The pressure-sensitive adhesive constituting the second pressure-sensitive adhesive layer 32 is smaller than the pressure-sensitive adhesive force of the pressure-sensitive adhesive constituting the first pressure-sensitive adhesive layer 31 from the viewpoint of preventing the second pressure-sensitive adhesive layer 32 from remaining on the adherend surface 5. Is selected. And the adhesive force of the adhesive which comprises the 2nd adhesive layer 32 specifically produces the convex of the unevenness | corrugation produced when the opening identification label 1 is peeled, preventing the residue to the adherend surface 5. From the viewpoint, it is preferable that the 180 degree peeling adhesive strength to the stainless steel test plate specified in JIS Z 0237 is 10 N / 25 mm or less. Further, if the thickness of the second pressure-sensitive adhesive layer 32 is too thick, the stress for pulling and peeling the peeling layer 22 through the first pressure-sensitive adhesive layer 31 is dispersed to cause insufficient peeling. The thickness of the second pressure-sensitive adhesive layer 32 is preferably 5 μm to 100 μm, and more preferably 10 μm to 50 μm, from the viewpoint of insufficient adhesive strength.

  In addition, the sticking part 3 is not only composed of the two pressure-sensitive adhesive layers as described above, that is, the first pressure-sensitive adhesive layer 31 and the second pressure-sensitive adhesive layer 32, but also includes three or more layers having different adhesive forces. You may be comprised with the adhesive layer. In that case, a pressure-sensitive adhesive layer having a large adhesive strength is arranged on the base material part 2 side, a pressure-sensitive adhesive layer having a low pressure-sensitive adhesive force is successively continued, and a pressure-sensitive adhesive layer having the smallest adhesive strength is arranged on the adherend surface 5 side. The

  Next, with reference to FIGS. 1-3, the use condition of the opening identification label 1 concerning this embodiment is demonstrated. As shown in FIG. 1, the opening identification label 1 is attached to the adherend surface 5 with the second adhesive layer 32 of the attachment portion 3 sticking to the adherend surface 5. Next, when peeling off the opened identification label 1 once attached, as shown in FIG. 2 (a), when the end of the opened identification label 1 is lifted, the release layer 22 does not exist in the base material portion 2 ( In the portion consisting of the topsheet 21 and the opaque layer 23, the base portion 2 and the sticking portion 3 are lifted off from the adherend surface 5 as they are, but the release layer 22 is present in the base portion 2 (the topsheet 21). Part of the base layer 2 is pulled by the sticking part 3 including the second pressure-sensitive adhesive layer 32 sticking to the adherend surface 5. As a result, the release layer 22 is peeled off to form the void 4.

  Subsequently, as shown in FIG. 2B, when the end of the unsealing identification label 1 is further lifted, a portion where the release layer 22 is present in the base material portion 2 (consisting of the surface sheet 21, the release layer 22, and the opaque layer 23) Since the second pressure-sensitive adhesive layer 32 of the sticking part 3 is adhered to the adherend surface 5, the second pressure-sensitive adhesive layer 32 that is adhered expands due to elasticity. Since the intermolecular force of the pressure-sensitive adhesive constituting the layer 32 is weakened, the pressure-sensitive adhesive force of the pressure-sensitive adhesive gradually decreases. On the other hand, since the adhesive force of the adhesive constituting the first adhesive layer 31 is larger than the adhesive constituting the second adhesive layer 32, the second adhesive layer 32 adhered firmly to the substrate part 2. The first pressure-sensitive adhesive layer 31 is pulled. Thus, the opening identification label 1 is peeled off with the first pressure-sensitive adhesive layer 31 and the second pressure-sensitive adhesive layer 32 constituting the sticking part 3 hardly remaining on the adherend surface 5.

  And, as shown in FIG. 3, the unsealed identification label 1 once adhered and peeled to the adherend surface 5 has a gap 4 between the peeled layer 22 and the opaque layer 23 of the base member 2 and is attached to the peeled identification label 1. Since the pressure-sensitive adhesive constituting the attachment part 3 expands and returns to the base material part 2 side, it shrinks and rounds, so that a part of the base material part 2 and the sticking part 3 are formed in an uneven shape. As described above, when the unsealing identification label 1 in the state shown in FIG. 3 is attached to the adherend surface 5 again and touched on the top sheet 1 of the base material portion 2, unevenness may occur. It is confirmed.

  Further, the unsealed identification label 1 once stuck and peeled off from the adherend surface 5 is peeled off from the opaque layer 23 when the opaque layer 23 of the base 2 is peeled off from the peeling layer 22 as shown in FIG. The space | gap 4 has arisen between the layers 22, and it does not return to the state before peeling. Therefore, patterns such as “opened” of the release layer 22 such as letters and figures remain appearing on the surface sheet 21, and the appearing pattern is not lost even if it is attached to the adherend surface 5 again. . In this way, the unsealed identification label 1 once adhered to and peeled off from the adherend surface 5 can confirm the history of peeling of the label both visually and visually.

  Next, a second embodiment of the present invention will be described.

  As shown in FIG. 4, the opening identification label 10 of the present embodiment includes a base material portion 2 composed of two layers, a transparent topsheet 21 and a release layer 22, a first pressure-sensitive adhesive layer 31, and a second pressure-sensitive adhesive. And a sticking portion 3 composed of two layers 32. The sticking part 3 is laminated | stacked on the base material part 2 so that the 1st adhesive layer 31 may contact the surface at the side of the peeling layer 22 of the base material part 2. FIG.

  The base material part 2 includes a transparent surface sheet 21 and a release layer 22 that serve as a label support. These selected materials, thicknesses, and the like are the same as those in the first embodiment described above. In addition, as shown in FIG. 4, since the opaque layer 23 in the first embodiment is not provided in this embodiment, the release layer 22 is formed on the surface sheet 21 on which the release layer 22 is formed. The 1st adhesive layer 31 which comprises the sticking part 3 adheres directly to the side. The sticking part 3 is formed by laminating the first pressure-sensitive adhesive layer 31 and the second pressure-sensitive adhesive layer 32 in the same manner as in the first embodiment described above, and the selected material, thickness, adhesive force, and the like. Is the same as in the first embodiment described above.

  In addition, the sticking part 3 is not only composed of the two pressure-sensitive adhesive layers as described above, that is, the first pressure-sensitive adhesive layer 31 and the second pressure-sensitive adhesive layer 32, but also includes three or more layers having different adhesive forces. You may be comprised with the adhesive layer. In that case, a pressure-sensitive adhesive layer having a large adhesive strength is arranged on the base material part 2 side, a pressure-sensitive adhesive layer having a low pressure-sensitive adhesive force is successively continued, and a pressure-sensitive adhesive layer having the smallest adhesive strength is arranged on the adherend surface 5 side. The

  Next, with reference to FIGS. 4 to 5, the usage state of the opening identification label 10 according to the present embodiment will be described. As shown in FIG. 4, the opening identification label 10 is attached to the adherend surface 5 with the second adhesive layer 32 of the attachment portion 3 sticking to the adherend surface 5. Next, when peeling off the opened identification label 10 once attached, as shown in FIG. 5A, when the end of the opened identification label 10 is lifted, the release layer 22 does not exist in the base material portion 2 ( The base part 2 and the sticking part 3 are lifted off from the adherend surface 5 as they are, and the part having only the top sheet 21 is peeled off, but the base layer 2 has a release layer 22 (the top sheet 21 and the release layer 22). The first adhesive layer 31 that is in contact with the release layer 22 is pulled by the second adhesive layer 32 that adheres to the adherend surface 5, so that the release layer 22 is released. A void 4 is generated.

  Next, as shown in FIG. 2B, when the end of the unsealing identification label 10 is further lifted, the part where the release layer 22 exists (consisting of the topsheet 21 and the release layer 22) is attached to the base material part 2. Since the second pressure-sensitive adhesive layer 32 of the part 3 is adhered to the adherend surface 5, the second pressure-sensitive adhesive layer 32 that is adhered expands due to elasticity, and constitutes the second pressure-sensitive adhesive layer 32 along with the expansion. Since the intermolecular force of the adhesive is weakened, the adhesive force of the adhesive gradually weakens. On the other hand, since the adhesive force of the adhesive constituting the first adhesive layer 31 is greater than the adhesive constituting the second adhesive layer 32, the second adhesive layer 32 is firmly adhered to the topsheet 21. 1 It is pulled by the adhesive layer 31. Thus, the opening identification label 10 is peeled off with the first pressure-sensitive adhesive layer 31 and the second pressure-sensitive adhesive layer 32 constituting the sticking part 3 hardly remaining on the adherend surface 5.

  And, as shown in FIG. 5, the unsealing identification label 10 once adhered to and peeled off from the adherend surface 5 has a gap 4 between the peeling layer 22 of the base material part 2 and the sticking part 3, Since the adhesive which comprises the sticking part 3 expand | extends and returns to the base-material part 2 side, since it shrinks and rounds, the sticking part 3 is formed in uneven shape. When the unsealing identification label 10 in which such a sticking part 3 becomes uneven is pasted on the adherend surface 5 again, and touches the top sheet 21 of the base material part 2, unevenness is generated. Is confirmed.

  Furthermore, as shown in FIG. 5, the opening identification label 10 once stuck and peeled off from the adherend surface 5 has the gap 4 due to the peeling of the first pressure-sensitive adhesive layer 31 from the peeling layer 22. It does not return to the previous state. Furthermore, when the opening identification label 10 is peeled off, the pressure-sensitive adhesive constituting the part of the sticking part 3 peeled from the peeling layer 22 expands and contracts, so that air enters the pressure-sensitive adhesive to form bubbles, Normally, the transparent adhesive becomes cloudy only in the stretched portion. Therefore, even if a pattern such as “opened” or the like of the release layer 22 appears on the surface sheet 21 and is pasted on the adherend surface 5 again, the appearing pattern is not lost. In other words, the unsealing identification label of this embodiment is made of a transparent material in which the base material portion 2 and the adhesive portion 3 constitute a transparent surface sheet 21, and the release layer 22 and the adhesive portion 3 constitute a transparent material. However, patterns such as letters and figures appear on the surface sheet 21 and can be visually confirmed. In this way, the unsealed identification label 10 once adhered to and peeled off from the adherend surface 5 can confirm the history of peeling of the label both visually and visually.

  The unsealing identification label of the present invention can prevent unauthorized opening of these files by attaching them to a file enclosing materials, a magnetic disk such as a CD or DVD, and an unsealed portion of a material storage shelf, etc. Can be confirmed visually and tactilely. In addition, it is easy to visually and tactilely determine whether or not it has been opened once by pasting the opening identification label of the present invention on the opening of a container enclosing disposable or used sanitary consumables, pharmaceuticals, foods, etc. Can be confirmed.

  Further, as described above, the opening identification label of the present invention can confirm the history of opening the container or the like, that is, the history of peeling the label both visually and visually. Therefore, it can cope with the use of the visually impaired. Moreover, it can respond also about the goods used under conditions with low visibility, such as a dark room.

  Hereinafter, the present invention will be described in detail with reference to examples.

1. Examination of the thickness of the surface sheet After a release printing with a silicone-based release agent on a transparent surface sheet (manufactured by Lintec Co., Ltd.) made of polyester film with a thickness of 25 μm, 38 μm, 50 μm, and 100 μm, aluminum deposition treatment was performed. To obtain substrate parts of various thicknesses. As an adhesive for the first adhesive layer that adheres to each base material part, PA-T1 (manufactured by Lintec Corporation, adhesive strength; 16N to 18N / 25 mm) is adhered to the adherend side and the first adhesive layer. As an adhesive to be laminated, non-carrier (manufactured by Maru Adhesive Co., Ltd., adhesive strength: 9.5N to 9.6N / 25mm) is laminated and adhered to each base material, and the opening identification labels having different thicknesses of the surface sheets Got.

  The unsealing identification label obtained above was stuck on the stainless steel surface and left for about 30 minutes. Thereafter, the unsealing identification label was peeled off from the stainless steel surface, and the ease of peeling at that time was evaluated. Moreover, the peeled open identification label was affixed on the stainless steel surface again, the surface sheet | seat was touched with the finger | toe, the unevenness which arose in the adhesion part was confirmed, and the confirmation condition of an unevenness | corrugation was evaluated. Furthermore, the display of the opening pattern by release printing was confirmed from the top sheet.

  The evaluation was performed in the following four stages. Concerning the confirmation of unevenness, ◎: unevenness is easily recognized, ○: unevenness is observed, Δ: has a portion where unevenness is not recognized, x: unevenness is not recognized. Regarding ease of handling (ease of peeling), ◎: can be easily peeled, ○: can be peeled, Δ: difficult to peel, x: cannot be peeled off. Regarding the display of the opening pattern, ◎: the opening pattern is clearly recognized, ○: the opening pattern is recognized, Δ: the opening pattern has an unclear portion, x: the opening pattern is not recognized.

  From the results of Table 1, it was found that the smaller the thickness of the top sheet, the clearer the confirmation of the unevenness that occurred in the sticking part after peeling. However, it has been found that if the surface sheet becomes too thin, the unsealed identification label itself becomes dull and it is difficult to remove the label once attached.

2. Examination of the adhesive strength of the first adhesive layer at the sticking part A transparent surface sheet (manufactured by Lintec Co., Ltd.) made of a polyethylene terephthalate film with a thickness of 50 μm was subjected to release printing with a silicon release agent, and then aluminum. The base material part was obtained by performing a vapor deposition process. As an adhesive for the first adhesive layer that adheres to the substrate part, adhesive strength (by 180-degree peeling method for stainless steel test plate specified in JIS Z 0237) 16N to 18N / 25mm, 10.8N to 13.5N / 25 mm, 5.6 N to 8.0 N / 25 mm, 2.5 N to 5.4 N / 25 mm acrylic adhesives (manufactured by Lintec Co., Ltd.) are selected for each test section, and are adhered to the adherend surface side. As a pressure-sensitive adhesive for the second pressure-sensitive adhesive layer to be laminated with one pressure-sensitive adhesive layer, a non-carrier (manufactured by Maru Adhesive Co., Ltd., adhesive strength: 9.5N to 9.6N / 25 mm) is laminated and adhered to each substrate part. The opening identification label from which the adhesive force of the 1st adhesive layer differs was obtained.

  The unsealing identification label obtained above was stuck on the stainless steel surface and left for about 30 minutes. Thereafter, the opening identification label was peeled off from the stainless steel surface, and the remaining state of the adhesive on the adherend surface was evaluated. Moreover, the peeled open identification label was affixed on the stainless steel surface again, the surface sheet | seat was touched with the finger | toe, the unevenness which arose in the adhesion part was confirmed, and the confirmation condition of an unevenness | corrugation was evaluated. Furthermore, the display of the opening pattern by release printing was confirmed from the top sheet.

  The evaluation was performed in the following four stages. Concerning the confirmation of unevenness, ◎: unevenness is easily recognized, ○: unevenness is observed, Δ: has a portion where unevenness is not recognized, x: unevenness is not recognized. Regarding the remaining state of the pressure-sensitive adhesive on the adherend surface, ◎: not remaining, ◯: hardly remaining, Δ: partially remaining, ×: remaining substantially. Regarding the display of the opening pattern, ◎: the opening pattern is clearly recognized, ○: the opening pattern is recognized, Δ: the opening pattern has an unclear portion, x: the opening pattern is not recognized.

  From the results in Table 2, the adhesive strength of the first pressure-sensitive adhesive layer is larger than the pressure-sensitive adhesive strength of the second pressure-sensitive adhesive layer. It was found that the confirmation of unevenness became clear. This is because if the adhesive at the sticking portion remains on the adherend surface, the unevenness generated at the sticking portion after peeling does not occur or the unevenness becomes small. Therefore, it was found that the adhesive strength of the first pressure-sensitive adhesive layer is preferably greater than 10 N / 25 mm, and more preferably greater than 15 N / 25 mm.

3. Examination of the adhesive strength of the second adhesive layer in the sticking part A transparent surface sheet (manufactured by Lintec Co., Ltd.) made of a polyethylene terephthalate film with a thickness of 50 μm was subjected to release printing with a silicon release agent, and then aluminum. The base material part was obtained by performing a vapor deposition process. PA-T1 (manufactured by Lintec Co., Ltd., adhesive strength: 16 to 18 N / 25 mm) is used as an adhesive for the first adhesive layer that adheres to the base material, and the first adhesive layer adheres to the adherend side. As the pressure-sensitive adhesive of the second pressure-sensitive adhesive layer to be laminated, adhesive strength (according to 180-degree peeling method against a stainless steel test plate specified in JIS Z 0237) 9.5 N to 9.6 N / 25 mm, 12.8 N / 25 mm, 14 Using each acrylic pressure-sensitive adhesive of 5 N / 25 mm and 14.7 N / 25 mm, opening identification labels having different adhesive forces of the second pressure-sensitive adhesive layer were obtained.

  About the opening identification label obtained above, by the same method and evaluation method as in Example 2, the remaining state of the adhesive on the adherend surface of each opening identification label, the confirmation state of unevenness and the display state of the opening pattern were examined. .

  From the results in Table 3, the adhesive strength of the second pressure-sensitive adhesive layer is smaller than the pressure-sensitive adhesive strength of the first pressure-sensitive adhesive layer. It was found that the confirmation of unevenness became clear. This is because if the adhesive of the sticking part including the second pressure-sensitive adhesive layer remains on the adherend surface, the unevenness generated in the sticking part after peeling does not occur or the unevenness becomes small. is there. Therefore, it was found that the adhesive strength of the second pressure-sensitive adhesive layer is preferably smaller than 10 N / 25 mm.

  The present invention is not limited to the above-described embodiments or examples, and variously modified forms are included in the technical scope without departing from the gist of the invention described in the claims. Is.

DESCRIPTION OF SYMBOLS 1, 10 Opening identification label 2 Base material part 21 Surface sheet 22 Peeling layer 23 Opaque layer 3 Adhering part 31 1st adhesive layer 32 2nd adhesive layer 4 Cavity 5 Adhering surface

Claims (3)

A substrate part comprising at least a release layer printed with a release agent on one surface of a transparent surface sheet, and laminated on the surface of the substrate part on the release layer side, and adhered to the adherend surface An opening identification label consisting of
The adhesive part is formed by laminating a plurality of adhesives having different adhesive forces, and the adhesive force of the adhesives is larger in the adhesive disposed on the substrate part side than on the adherend side. An opening identification label characterized by the above.   The adhering portion is composed of a first pressure-sensitive adhesive layer that adheres to the base material portion and a second pressure-sensitive adhesive layer that adheres to the adherend surface, and the pressure-sensitive adhesive force of the pressure-sensitive adhesive constituting the first pressure-sensitive adhesive layer is the above-mentioned. The opening identification label according to claim 1, wherein the opening identification label is larger than the adhesive strength of the adhesive constituting the second adhesive layer.   The opening identification label according to claim 2, wherein the second adhesive layer has an adhesive strength of 10 N / 25 mm or less by peeling 180 degrees to the stainless steel plate.

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