How to remove the adhesive

Abstract

To provide a laminate excellent in curl resistance and excellent in detachability of a patch when a release liner is deformed such as turning over.SOLUTION: A laminate 100 has a configuration in which an adhesive 110 is releasably laminated on a surface 121 of a release liner 120, and a portion of the surface of the release liner that is different from a location where the patch is arranged is exposed. The bending resistance of the release liner measured according to the 45° cantilever method described in JIS L1096:2010, 8.21 is 50 mm or more and 140 mm or less. For the patch, a test piece 110A with a width W of 10 mm placed on a table 1000 is protruded from the table by 10 mm when viewed from a direction IV perpendicular to the mounting surface 1001 of the test piece, and the protruded portion 113A is pressed. The force F required to bend 90° is 0.1 N or more and 0.6 N or less.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a laminate and a method for removing an adhesive patch. [Background technology]

[0002] Adhesive materials such as stickers and labels have been used in various fields. For example, Patent Document 1 discloses an adhesive material used in hard disk drives, and Patent Document 2 discloses an adhesive material used in automobile body components.

[0003] In the invention of Patent Document 1, a fold is provided in part of the sticker, which is the adhesive material, making it easier to peel the adhesive material off the backing by flipping it over. However, in a laminate in which an adhesive material and a release liner are stacked together, whether it is easier to peel the adhesive material or the release liner by flipping it over depends on the situation.

[0004] For example, the inventors have found through their investigations that when the patch is relatively small or when working with gloves on, peeling back the release liner makes it easier to peel the patch and the release liner apart. In particular, the inventors have found that if the release liner is deformed by being peeled back, and the patch follows this and is partially peeled off from the release liner by repulsive force, the patch is easier to grasp and peel off.

[0005] Furthermore, the inventors have investigated methods for strengthening the repulsive force of such patches, and as a result of their investigations, have found that the repulsive force can be strengthened by making the release liner that the patch follows more easily deformable, and have therefore come up with the idea of ​​weakening the stiffness of the release liner. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Patent No. 6141279 [Patent Document 2] Japanese Utility Model Application Publication No. 7-15516 Summary of the Invention [Problem to be solved by the invention]

[0007] However, release liners with weak stiffness have the drawback of being prone to curling before release, and having low curl resistance.

[0008] On the other hand, if the stiffness of the release liner is increased, curl resistance will be improved, but deformation of the release liner and, consequently, deformation of the adhesive sheet will be suppressed, making it difficult to remove the adhesive sheet by utilizing the deformation of the release liner.

[0009] The present invention has been made in view of these problems, and has as its object to provide a laminate that has excellent curl resistance and provides good releasability of the adhesive patch when the release liner is deformed by peeling it off. [Means for solving the problem]

[0010] To achieve the above object, the present invention provides a laminate in which an adhesive patch is releasably laminated on the surface of a release liner, and a portion of the surface of the release liner different from the location of the adhesive patch is exposed. The release liner has a bending resistance of 50 mm or more and 140 mm or less, measured in accordance with the 45° cantilever method described in JIS L1096:2010, 8.21. When a 10 mm wide test piece of the adhesive patch is placed on a stand and allowed to protrude 10 mm from the stand when viewed from a direction perpendicular to the surface on which the test piece is placed, the force required to press the protruding portion and bend it 90° is 0.1 N or more and 0.6 N or less. [Effects of the Invention]

[0011] According to the laminate having the above configuration, the release liner has a strong stiffness suitable for suppressing curling, and therefore exhibits excellent curl resistance.

[0012] Furthermore, even if the release liner is deformed slowly due to its strong stiffness, the patch has a strong stiffness that exerts a suitable repulsive force accordingly, and therefore the patch has good releasability when the release liner is deformed by peeling it off. [Brief explanation of the drawings]

[0013] [Figure 1] FIG. 2 is a side view of the laminate of the embodiment. [Figure 2] FIG. 2 is a plan view of the laminate of the embodiment. [Figure 3] FIG. 1 is a diagram showing a test piece placed on a stand for measuring the stiffness of an adhesive patch. [Figure 4] FIG. 4 is a plan view seen from the direction of arrow IV in FIG. 3 (a direction perpendicular to the surface on which the test piece is placed). [Figure 5] FIG. 1 is a diagram showing an outline of measurement of stiffness of an adhesive patch. [Figure 6] FIG. 1 is a diagram showing an outline of measurement of stiffness of an adhesive patch. [Figure 7] FIG. 1 is a diagram showing an outline of measurement of stiffness of an adhesive patch. [Figure 8] FIG. 2 is a partially enlarged side view of the release liner. [Figure 9] FIG. 10 is a side view of a laminate in which the release liner has been peeled off. [Figure 10] FIG. 10 is a side view of a laminate in which the edge of the adhesive material is naturally peeled off by repulsion force from the curved portion of the release liner that has been deformed by peeling it over. [Figure 11] FIG. 10 is a side view of the laminate in which the adhesive material has been peeled off and the margin of the release liner has expanded. [Figure 12] FIG. 2 is a side view of a laminate in which the margin of the release liner is folded back to the back surface. [Figure 13] FIG. 10 is a side view of a laminate in which the end of the adhesive material has naturally peeled off from the curved folded-back portion of the release liner due to repulsive force. DETAILED DESCRIPTION OF THE INVENTION

[0014] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Note that the dimensional proportions in the drawings are exaggerated for the sake of convenience and differ from the actual proportions.

[0015] As shown in Fig. 1, the laminate 100 of the embodiment has a configuration in which an adhesive patch 110 and a release liner 120 are laminated together. The adhesive patch 110 is releasably laminated onto a surface 121 of the release liner 120. The adhesive patch 110 is used, for example, in the field of electrical appliances to seal holes formed in members that constitute casings, but the fields and uses to which the present invention can be applied are not particularly limited.

[0016] The adhesive material 110 has a configuration in which a base layer 111 and an adhesive layer 112 are laminated together. The base layer 111 is formed from a material such as, for example, polyvinyl chloride, polyester such as polyethylene terephthalate, or polyolefin such as polyethylene or polypropylene. The base layer 111 has a thickness of, for example, but not limited to, 40 μm or more and 500 μm or less. The adhesive layer 112 is mainly composed of an adhesive such as an acrylic adhesive, polyester adhesive, urethane adhesive, or rubber adhesive, and may also contain various additives such as an antistatic agent, a plasticizer, a tackifier, or a stabilizer, as necessary.

[0017] As shown in FIG. 2, the adhesive patch 110 has a circular shape, and the surface 121 of the release liner 120 is exposed at a location other than where the adhesive patch 110 is placed.

[0018] There are no particular limitations on how patch 110 is shaped, but for example, patch 110 can be shaped by cutting base material layer 111 and adhesive layer 112, which are formed so as to cover the entire surface 121 of release liner 120, in the thickness direction with a blade to form the outer shape of patch 110, and peeling off and removing unnecessary base material layer 111 and adhesive layer 112 outside this outer shape, a process known as scrap removal.

[0019] Although adhesive patch 110 has strong stiffness, if one were to attempt to specify the specific stiffness in accordance with a general measurement method, such as the 45° cantilever method described in JIS L1096:2010, 8.21, the shape of adhesive patch 110, which is the object of measurement, is not suitable for this measurement method, and stiffness cannot be specified. Therefore, the stiffness of adhesive patch 110 was specified using a unique measurement method.

[0020] Specifically, as shown in FIG. 3, a test piece 110A made from adhesive material 110 was placed on a base 1000 so that it partially protruded, and the force required to press and bend the protruding portion 113A by 90° was determined as stiffness.

[0021] The structure and size of the base 1000 are not particularly limited as long as it has a flat mounting surface 1001 on which the test piece 110A is placed and a corner 1002 bent at a right angle from the mounting surface 1001. The test piece 110A is fixed to the mounting surface 1001 via an adhesive layer 112, but this is not limiting, and a form in which it is fixed using tape, for example, is also included in the scope of the present invention. In FIG. 3, the protruding portion 113A protrudes horizontally from the mounting surface 1001, but this is not limiting, and it may be curved. The test piece 110A is formed by cutting it out from the adhesive material 110.

[0022] 4, the test piece 110A has a width W of 10 mm. When viewed from a direction perpendicular to the mounting surface 1001, the protruding portion 113A protrudes from the base 1000 by a length L of 10 mm.

[0023] The longitudinal length of the test piece 110A, which is perpendicular to the width W, is not particularly limited, but if the portion fixed to the mounting surface 1001 is too narrow, there is a risk that the test piece 110A will come off, so it is preferable that the length be such that the test piece 110A can be securely fixed to the mounting surface 1001.

[0024] As shown in Figures 5 to 7, protruding portion 113A can be bent 90 degrees by pressing it against corner 1002, and at this time, by pressing protruding portion 113A with, for example, a push-pull gauge P, the force F required to bend protruding portion 113A 90 degrees can be measured.

[0025] The push-pull gauge P is pressed perpendicularly against the surface of the protruding portion 113A from the side of the base material layer 111. Furthermore, the present invention is not limited to the case where the push-pull gauge P is pressed perpendicularly at an angle of exactly 90° to the surface of the protruding portion 113A as in the illustrated example, and the case where the push-pull gauge P is pressed almost perpendicularly is also included in the scope of the present invention.

[0026] For example, if the protruding portion 113A is bent, it is difficult to press the push-pull gauge P against the surface of the protruding portion 113A at exactly 90°, and the direction in which the push-pull gauge P is pressed may have a slight inclination, for example, of 15° or less, relative to the normal direction of the surface of the protruding portion 113A.

[0027] Furthermore, due to the pressure from the push-pull gauge P, the protruding portion 113A bends and deforms to fit along the corner 1002, while the push-pull gauge P is kept pressed against the surface of the protruding portion 113A perpendicularly or approximately perpendicularly as described above, and measures the force.

[0028] The force measured by the push-pull gauge P, that is, the force F required to bend the protruding portion 113A by 90°, is 0.1N or more and 0.6N or less.

[0029] A larger force F indicates a stronger stiffness of the adhesive patch 110, and a smaller force F indicates a weaker stiffness of the adhesive patch 110. The stiffness of the adhesive patch 110 depends mainly on the base layer 111, and can be adjusted by changing the material and thickness of the base layer 111.

[0030] Unlike the adhesive material 110, the stiffness of the release liner 120 can be measured in accordance with the 45° cantilever method described in JIS L1096:2010, 8.21, and the bending resistance measured in accordance with this measurement method is 50 mm or more and 140 mm or less. A higher bending resistance indicates that the release liner 120 is less flexible and has greater stiffness, and a lower bending resistance indicates that the release liner 120 is more flexible and has less stiffness.

[0031] 8, release liner 120 has, in the stacking direction, a release agent layer 122, a resin laminate layer 123, a substrate 124, and a resin laminate layer 125. Of both sides of release liner 120, the side facing release agent layer 122 is surface 121 on which adhesive patch 110 is stacked.

[0032] The release agent layer 122 is formed from a release agent composition containing, for example, a silicone compound, and has good releasability from the adhesive patch 110 .

[0033] The resin laminate layers 123 and 125 are each formed of, for example, polyethylene, but are not limited thereto, and forms formed of other resins are also within the scope of the present invention. Furthermore, the resin laminate layers 123 and 125 each have a thickness of 10 μm or more and 40 μm or less, but are not limited thereto.

[0034] The substrate 124 is, for example, 80 g / m 2 More than 200g / m 2 The release liner 120 is preferably made of high-quality paper because it has good curl resistance among papers, but the material and thickness of the substrate 124 are not particularly limited as long as the release liner 120 can perform its essential functions such as curl resistance.

[0035] The stiffness of release liner 120 depends mainly on the material and thickness (basis weight) of substrate 124, and also varies depending on the material and thickness of resin laminate layers 123, 125, so it can be adjusted by changing these.

[0036] Next, a method for removing the adhesive patch 110 will be described.

[0037] 9, in the patch removal method of the present embodiment, the worker deforms the patch by peeling back the release liner 120. The patch 110 follows the deformation of the release liner 120, and at the same time, due to its stiffness, the repulsive force increases as the release liner 120 deforms.

[0038] 10, when the adhesive material 110 is deformed to a certain extent, the end portion spontaneously peels off (spontaneous peeling) due to a repulsive force. The worker then peels off the adhesive material 110 from the peeled end portion. The peeled adhesive material 110 is attached to a predetermined location on the object to be attached.

[0039] After the adhesive material 110 has been peeled off, the release liner 120 has an increased margin of space where the adhesive material 110 is not present, as shown in Figure 11. If the release liner 120 has a large margin, the worker peels off the adhesive material 110 by folding back the margin toward the back surface 127 of the release liner 120 and peeling back the release liner 120.

[0040] Specifically, as shown in FIG. 12, the worker folds back a marginal portion 126 of the release liner 120 where no adhesive material 110 is present, feeding it from end 128 toward the back surface 127 of the release liner 120, and then further moves end 128 away from the folded portion 129 thus formed, thereby turning over the release liner 120.

[0041] 13, when the folded portion 129 reaches the placement location of the adhesive material 110, the adhesive material 110 deforms to follow the curved shape of the folded portion 129, but after it has deformed to a certain extent, the end portion spontaneously peels off due to a repulsive force. The worker peels the adhesive material 110 from the peeled end portion and sticks it to a predetermined location on the object to be attached. Furthermore, when it is desired to peel off the next adhesive material 110, the worker further moves the end portion 128 so that the folded portion 129 reaches the next adhesive material 110.

[0042] While moving end 128, the worker must maintain folded portion 129 against the stiffness of release liner 120; however, if the worker holds release liner 120 with the back surfaces 127 overlapping each other and pinches it between the fingers in the thickness direction while sliding back surfaces 127 together, it is easy to move release liner 120 to the adhesive material 110 to be peeled off while maintaining folded portion 129.

[0043] In this case, if the frictional resistance between the back surfaces 127 is small, they can be slid smoothly and workability is excellent. From this perspective, the static friction coefficient between the back surfaces 127 of the release liners 120 is preferably greater than 0 and equal to or less than 4.

[0044] In fact, the inventors checked the workability in several cases where the static friction coefficient between the back surfaces 127 was different, and found that when the static friction coefficient was 0.3, 0.4, and 1.6, the back surfaces 127 could be easily slid smoothly against each other, and the workability was particularly good. When the static friction coefficient was 2.4, there was a slight sense of resistance between the back surfaces 127, but the back surfaces 127 could be slid against each other to peel off the adhesive material 110. On the other hand, when the static friction coefficient was 4.1, the resistance between the back surfaces 127 was high, and it was difficult to slide the back surfaces 127 against each other to peel off the adhesive material 110.

[0045] Next, the effects of this embodiment will be described.

[0046] In this embodiment, the release liner 120 has a bending resistance of 50 mm or more and 140 mm or less, measured in accordance with the 45° cantilever method described in JIS L1096:2010, 8.21, and the release liner 120 has a strong stiffness suitable for suppressing curling. Therefore, the laminate 100 of this embodiment exhibits excellent curl resistance.

[0047] On the other hand, because the release liner 120 has a strong stiffness, it deforms relatively slowly, for example at the folded portion 129, and therefore has a relatively low advantage in terms of generating a repulsive force in the adhesive material 110 compared to a material with weak stiffness that bends with a smaller curvature.

[0048] However, in this embodiment, even if the deformation of the release liner 120 is gradual, the patch 110 has enough stiffness to exert a suitable repulsive force accordingly. Specifically, the force F required to press the protruding portion 113A and bend it 90° is 0.1 N or more and 0.6 N or less, and due to this stiffness, the patch 110 exerts a suitable repulsive force accordingly, even if the deformation of the release liner 120 is gradual. Therefore, the releasability of the patch 110 is good when the release liner 120 is deformed by peeling it off.

[0049] As for the stiffness of the adhesive material 110, if the force F is 0.1 N or more, a suitable repulsive force can be exerted, and the stronger the stiffness, the better in terms of exerting the repulsive force, but on the other hand, if it is too strong, it will have difficulty conforming to the shape of the object to be attached when attached to the object. Therefore, it is preferable that the stiffness of the adhesive material 110 is such that the force F is 0.6 N or less, and with such a configuration, it can conform well to the shape of the object to be attached.

[0050] In the release liner 120, if the static friction coefficient between the back surfaces 127 is greater than 0 and equal to or less than 4, when the folded portion 129 is moved to the adhesive material 110 to be peeled off, the back surfaces 127 can be easily overlapped and slid smoothly, improving workability.

[0051] The substrate 124 of the release liner 120 is 80 g / m 2 More than 200g / m 2 If the release liner 120 is formed from paper having the following basis weight, it can effectively exhibit curl resistance due to its excellent stiffness, and also has a certain degree of flexibility, making it easy to deform the release liner 120 by peeling it over.

[0052] In this embodiment, the adhesive material 110 has a circular shape and no corners, so that the adhesive material 110 is less likely to be accidentally caught on the fingers of an operator, for example, and unintentional peeling of the adhesive material 110 is prevented.

[0053] The present invention is not limited to the above-described embodiments, but can be modified in various ways within the scope of the claims.

[0054] For example, the scope of the present invention also includes a configuration in which resin laminate layer 125 is removed from release liner 120 of the above configuration, exposing one surface of substrate 124. Furthermore, the planar shape of the release liner is not limited to the shape shown in Figure 2, and rectangular shapes such as rectangles and squares, as well as shapes other than these, are also included in the scope of the present invention.

[0055] Furthermore, the shape of the adhesive patch is not limited to a circular shape as in the above embodiment, but may be an elliptical shape. If the adhesive patch has an elliptical shape, as in the above embodiment, there will be no corners, and unintentional peeling due to inadvertent catching can be prevented.

[0056] Furthermore, the shape of the adhesive material is not limited to a circle or an oval, but may be a rectangular shape such as a rectangle or a square, or may be a shape other than these.

[0057] The adhesive material is not particularly limited as long as it is used by application, and may be, for example, a label, tape, sticker, or the like. [Explanation of symbols]

[0058] 100 laminates, 110 adhesive materials, 110A adhesive test piece, 111 Base material layer, 112 adhesive layer, 113A The protruding portion of the test piece from the base, 120 release liner, 121 laminated surface of adhesive material; 122 release agent layer, 123 resin laminate layer, 124 Base material, 125 resin laminate layer, 126 Blank areas without adhesive material, 127 Backside of release liner, 128 release liner edge, 129 Folded part, 1000 units, 1001 test piece mounting surface, 1002 corners, W is the width of the specimen, L The length of the part of the test piece that protrudes from the base as viewed from a direction perpendicular to the surface on which the test piece is placed.

Claims

1. A laminate in which an adhesive material having a base layer made of a forming material of polyvinyl chloride or polyolefin is releasably laminated on the surface of a release liner, and a portion of the surface of the release liner different from the location of the adhesive material is exposed, the release liner has a bending resistance measured in accordance with the 45° cantilever method described in JIS L1096:2010, 8.21 of 50 mm or more and 140 mm or less; In the laminate, a 10 mm wide test piece placed on a base is caused to protrude 10 mm from the base when viewed from a direction perpendicular to the surface on which the test piece is placed, and the force required to press and bend the protruding portion by 90° is 0.1 N or more and 0.6 N or less; A method for removing an adhesive patch, in which, when deforming the release liner by turning it over, the back surfaces of the release liners are overlapped with each other, and while holding them with fingers in the thickness direction, the back surfaces are slid against each other until a part of the adhesive patch naturally peels off from the release liner, and then the adhesive patch is peeled off from the naturally peeled part.

2. 2. The method for removing an adhesive patch according to claim 1, wherein the coefficient of static friction between the surface and the back surface opposite the surface of the release liner is greater than 0 and equal to or less than 4.

3. The release liner has a density of 80 g / m ２ More than 200g / m ２ 3. The adhesive patch removing method according to claim 1, wherein the substrate is formed from paper having a basis weight of:

4. 4. The adhesive patch removal method according to claim 1, wherein the adhesive patch has a circular or elliptical shape.

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