Laminate and method for producing laminate

Abstract

To provide a laminate and a method for manufacturing the same, which can prevent breakage of a peelable liner that contains a paper base material and is formed with a notch, even when the peelable liner is deformed so as to turn over.SOLUTION: In a laminate 100, a sticking material 110 is peelably laminated on a surface 121 of a peelable liner 120, and a part different from an arrangement part of the sticking material in the surface of the peelable liner is exposed. The peelable liner has a paper base material 124, and a resin laminate layer 123 provided on a side closer to the sticking material side than the paper base material, and a notch 126 along the edge of the sticking material is formed on the surface. The notch reaches the resin laminate layer from the surface, and is positioned on a side closer to the resin laminate layer side than the paper base material.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a laminate and a method for producing the laminate. [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 testing 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 can be easily grasped and peeled off. [Prior art documents] [Patent documents]

[0005] [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]

[0006] However, release liners containing a paper substrate and having cuts formed therein may break when deformed by turning over, and the inventors' investigations have shown that such breakage occurs when the cuts formed in the release liner reach the paper substrate contained in the release liner.

[0007] More specifically, the cutting edge of the blade used to form the adhesive patch into a predetermined shape penetrates the paper substrate contained in the release liner, cutting into the paper substrate, and starting from this weak point, part of the paper substrate is torn off towards the adhesive patch being peeled off, destroying it.

[0008] The present invention has been made in consideration of such problems, and aims to provide a laminate and a method for producing the same, which can prevent the release liner from being destroyed even if the release liner contains a paper substrate and has cuts formed therein, and is deformed by being turned over. [Means for solving the problem]

[0009] In order to achieve the above object, the laminate of the present invention has an adhesive patch releasably laminated to a 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 paper substrate and a resin laminate layer provided on the adhesive patch side of the paper substrate, and a notch is formed on the surface along the edge of the adhesive patch. The notch extends from the surface to the resin laminate layer and is located on the resin laminate layer side of the paper substrate.

[0010] To achieve the above object, the method for producing a laminate of the present invention includes preparing a workpiece having a base layer, an adhesive layer, and a release liner in that order in the stacking direction, the release liner having a paper base and a resin laminate layer disposed on the adhesive layer side of the paper base. Then, a blade is applied to the workpiece from the base layer side, and an incision is formed by cutting the workpiece with the blade until the tip of the blade penetrates the base layer and the adhesive layer, reaches the resin laminate layer of the release liner, and is positioned on the resin laminate layer side of the paper base. Then, the excess base layer and adhesive layer other than the remaining portion are peeled off and removed, leaving the base layer and adhesive layer surrounded by the incision. [Effects of the Invention]

[0011] According to the invention having the above configuration, the notches do not reach the paper base material contained in the release liner, and the formation of a starting point for fracture is avoided, so that even if the release liner containing the paper base material and the notches is deformed by being turned over, fracture can be prevented. [Brief explanation of the drawings]

[0012] [Figure 1] FIG. 2 is a perspective view of a laminate according to an embodiment. [Figure 2] FIG. 2 is a cross-sectional view taken along line II-II in FIG. [Figure 3] 10 is a cross-sectional view showing the formation of cuts in a workpiece that serves as the base for the laminate; FIG. [Figure 4] FIG. 10 is a cross-sectional view showing scrap removal, in which an excess portion is peeled off and removed from a workpiece. [Figure 5] FIG. 10 is a cross-sectional view of a workpiece in which a cut is formed at a depth different from that of the embodiment. [Figure 6] FIG. 10 is a cross-sectional view of a workpiece in which a cut is formed at a depth different from that of the embodiment. [Figure 7] 10 is a cross-sectional view of a laminate in which, unlike the embodiment, a slit is formed in the release liner that reaches the paper substrate. [Figure 8]8 is a cross-sectional view of the laminate of FIG. 7 in which the release liner is deformed by being peeled off. [Figure 9] FIG. 8 is a cross-sectional view of the laminate of FIG. 7 in which breakage has occurred in the release liner. [Figure 10] FIG. 2 is a cross-sectional view taken along line XX in FIG. [Figure 11] 11 is a cross-sectional view of the laminate of FIG. 10 in which the release liner is peeled off. [Figure 12] FIG. 11 is a cross-sectional view of the laminate of FIG. 10 in which the adhesive patch has been peeled off without causing damage to the release liner. DETAILED DESCRIPTION OF THE INVENTION

[0013] 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 explanation and differ from the actual proportions.

[0014] 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. A portion of the surface 121 other than the location where the adhesive patch 110 is disposed is exposed. In addition, a cut 126 is formed on the surface 121 along the edge of the adhesive patch 110.

[0015] The adhesive material 110 is used by peeling it off from the release liner 120 and adhering it to an object to which it is to be attached. There are no particular limitations on the fields or uses to which the present invention can be applied, and for example, the adhesive material 110 may be a label that displays a barcode and be attached to an electrical product that is the object to which it is to be attached, or it may be applied not only to the field of electrical products but also to the field of automobiles, for example, and the present invention may also be applied to different uses other than displaying information, such as sealing holes.

[0016] 2, the adhesive patch 110 has a configuration in which a base layer 111 and an adhesive layer 112 are laminated together. After being peeled from the release liner 120, the adhesive patch 110 is attached to an object to be attached via the adhesive layer 112.

[0017] The material for forming the base layer 111 is, for example, a polyester such as polyvinyl chloride or polyethylene terephthalate, or a polyolefin such as polyethylene or polypropylene. The base layer 111 has a thickness of, for example, 40 μm or more and 500 μm or less, but is not limited to this.

[0018] The adhesive layer 112 is mainly composed of an adhesive such as an acrylic adhesive, a polyester adhesive, a urethane adhesive, or a rubber adhesive, and may also contain various additives such as an antistatic agent, a plasticizer, a tackifier, or a stabilizer, as needed.

[0019] The release liner 120 has, in this order in the stacking direction, a release agent layer 122, a resin laminate layer 123, a paper substrate 124, and a resin laminate layer 125. In the release liner 120, the incision 126 extends from the laminated surface 121 of the adhesive material 110 to the resin laminate layer 123 (the resin laminate layer provided on the adhesive material side), and is located on the resin laminate layer 123 side of the paper substrate 124 (it does not reach the paper substrate 124).

[0020] 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 .

[0021] 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.

[0022] The paper substrate 124 is preferably 80 g / m 2 More than 200g / m 2 The paper substrate 124 is preferably made of high-quality paper, but the present invention also includes paper substrate 124 made of other paper.

[0023] Next, a method for producing a laminate according to this embodiment will be described.

[0024] 3, in the laminate production method of this embodiment, a workpiece 1000 to be processed is prepared, and then a laminate 100 is produced based on the workpiece 1000. The workpiece 1000 has a base layer 1111, an adhesive layer 1112, and a release liner 120, in this order in the stacking direction.

[0025] The base material layer 1111 and the adhesive layer 1112 are formed on the entire surface of the release liner 120. The material of the base material layer 1111 is the same as that of the base material layer 111 of the adhesive material 110, and the material of the adhesive layer 1112 is the same as that of the adhesive layer 112 of the adhesive material 110.

[0026] There are no particular limitations on how the workpiece 1000 itself is formed; for example, it may be formed by bonding a laminate of a base layer 1111 and an adhesive layer 1112 to a release liner 120, or the workpiece 1000 may be formed by sequentially laminating the adhesive layer 1112 and the base layer 1111 onto the release liner 120 in that order.

[0027] After the workpiece 1000 is prepared, the blade 1 is inserted into the workpiece 1000 to form the incision 126. The blade 1 is placed against the workpiece 1000 from the base material layer 1111 side, and is inserted until the cutting edge penetrates the base material layer 1111, the adhesive layer 1112, and the release agent layer 122, reaches the resin laminate layer 123, and is positioned closer to the resin laminate layer 123 than the paper base material 124 (until a position not reaching the paper base material 124).

[0028] After forming the incision 126, the base material layer 1111 and adhesive layer 1112 surrounded by the incision 126 are left, and the excess base material layer 1111 and adhesive layer 1112 other than the remaining portions are peeled off and removed.

[0029] As shown in FIG. 4, excess base material layer 1111 and adhesive layer 1112 are peeled off and removed, that is, scraped off, and the remaining portions become adhesive material 110.

[0030] In this embodiment, the incision 126 penetrates the base material layer 1111, the adhesive layer 1112, and the release agent layer 122 to reach the resin laminate layer 123, thereby reliably separating the excess base material layer 1111 and the adhesive layer 1112 from the portion that will become the adhesive material 110.

[0031] In contrast, as shown in Figure 5, for example, when a cut 126a is formed that reaches only from the base material layer 1111 to the adhesive layer 1112, unlike this embodiment, the part surrounded by the cut 126a and the other excess part are connected by the adhesive layer 1112, and therefore the excess part cannot be removed properly.

[0032] 6, even when incision 126b is formed that penetrates base material layer 1111 and adhesive layer 1112 but only reaches release agent layer 122, the adhesive seeps out of adhesive layer 1112, connecting the portion surrounded by incision 126b with the remaining excess portion, making it impossible to properly remove the excess waste. Furthermore, release agent layer 122 is very thin, and it is difficult to accurately control the cutting edge so that it stops at release agent layer 122, so the formation of incision 126b is unstable.

[0033] On the other hand, in this embodiment, the portion that will become the adhesive material 110 is reliably separated from the other excess portion by the incision 126, as described above, and the excess portion can be satisfactorily removed as waste. Furthermore, in this embodiment, the cutting edge does not need to be stopped by the release agent layer 122 when forming the incision 126, and there is no need to control the position of the cutting edge extremely accurately, as with the incision 126b, so the incision 126 can be formed stably.

[0034] Next, the effects of this embodiment will be described in comparison with a laminate 100A having a different configuration from this embodiment.

[0035] 7, the laminate 100A has a release liner 120A with a cut 126c formed therein, which is different from that of the present embodiment. The cut 126c penetrates the release agent layer 122 and the resin laminate layer 123, reaching the paper substrate 124. Other than the cut 126c, the structure of the laminate 100A is the same as that of the laminate 100 of the present embodiment.

[0036] Because the cuts 126c reach the paper substrate 124, when the release liner 120A is turned over and deformed in the laminate 100A to peel off the adhesive material 110, there is a risk that the release liner 120A may be broken.

[0037] 8, when release liner 120A is deformed by being turned over, more specifically, when release liner 120A is deformed so that marginal portion 127 where adhesive patch 110 is not laminated is folded back toward back surface 128, adhesive patch 110 follows the deformation of release liner 120A, while increasing its resilience due to its stiffness. Such resilience causes adhesive patch 110 to attempt to peel off from release liner 120A.

[0038] However, in the release liner 120A, the incision 126c reaches the paper substrate 124, forming a weak portion with greatly reduced strength, and as the adhesive material 110 tries to peel off from this point, it breaks.

[0039] Specifically, as shown in FIG. 9, release liner 120A is destroyed as part of paper substrate 124 is peeled off from the weakened portion where cut 126c is formed toward adhesive material 110 that is being peeled off.

[0040] On the other hand, as shown in FIG. 10, in this embodiment, the incisions 126 do not reach the paper substrate 124, and no weak portions that could be the starting points for fracture are formed in the release liner 120.

[0041] As shown in FIG. 11, when the release liner 120 is deformed by peeling it back, the adhesive material 110 in this embodiment also follows the deformation of the release liner 120 and increases its resilience due to its stiffness.

[0042] However, as shown in FIG. 12, in this embodiment, the incision 126 does not reach the paper substrate 124, and no weak portion that could be the starting point for breakage is formed, so that breakage can be prevented even if the release liner 120 is deformed by being turned over.

[0043] Furthermore, because the release liner 120 is not damaged, the patch 110 can be peeled off smoothly, resulting in excellent workability. The end of the patch 110 spontaneously peels off (naturally peels off) from the release liner 120 due to the repulsive force, and the worker can peel off the entire patch 110 from the peeled end and apply it to the object to be attached.

[0044] In this embodiment, the notches 126 are formed so as to reach the resin laminate layer 123, which allows for good scrap removal as described above.

[0045] When the adhesive material 110 is peeled off, the release liner 120 is deformed by being turned over, but if the release liner 120 has a tendency to curl under normal circumstances other than when the adhesive material 110 is being peeled off, this may result in a decrease in quality and ease of handling.

[0046] In contrast, the paper substrate 124 is 80 g / m 2 If the basis weight is set to 200 g / m or more, the stiffness of the release liner 120 can be increased, and the curl resistance can be improved. 2 If the thickness is below this value, the stiffness of the release liner 120 will not be excessively strong, and flexibility will be ensured, making it easy to deform the release liner 120 by peeling it over.

[0047] Furthermore, by making the thickness of resin laminate layer 123 10 μm or more, the stiffness of release liner 120 can be increased, thereby improving curl resistance. Furthermore, if the thickness of resin laminate layer 123 is 40 μm or less, the stiffness of release liner 120 does not become excessively strong, and flexibility is ensured, making it easy to deform release liner 120 by peeling it over.

[0048] Furthermore, if the thickness of resin laminate layer 123 is 10 μm or more, even if the blade tip is slightly misaligned when forming incision 126, it is difficult for it to penetrate paper substrate 124, and damage to release liner 120 can be more effectively prevented.

[0049] The present invention is not limited to the above-described embodiments, but can be modified in various ways within the scope of the claims.

[0050] For example, the scope of the present invention also includes a configuration in which the resin laminate layer 125 is removed from the release liner 120 of the above embodiment, exposing one side of the paper substrate 124. Also included within the scope of the present invention is a configuration in which there is no release agent layer 122. In this case, for example, the resin laminate layer 123 can be formed from a resin with releasability, thereby substituting for the function of the release agent layer 122.

[0051] The planar shape of the release liner is also not particularly limited, and in addition to rectangular shapes such as rectangles and squares, shapes other than these are also included within the scope of the present invention.

[0052] The shape of the adhesive material is also not particularly limited, and in addition to rectangular shapes such as rectangles and squares, circular shapes, ovals, and shapes other than these are also included within the scope of the present invention.

[0053] 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]

[0054] 100 laminates, 110 adhesive materials, 111 Base material layer, 112 adhesive layer, 120 release liner, 121 laminated surface of adhesive material; 122 release agent layer, 123 resin laminate layer (resin laminate layer provided on the adhesive side), 124 Base material, 125 resin laminate layer, 126 cuts, 127 Blank areas without adhesive material, 128 Backside of release liner, 1000 Work material, 1111 Base material layer, 1112 Adhesive layer.

Claims

1. A laminate in which an adhesive patch is releasably laminated on a surface of a release liner, and a portion of the surface of the release liner that is different from the portion where the adhesive patch is disposed is exposed, the release liner has a paper substrate and a resin laminate layer provided on the adhesive material side of the paper substrate, and a notch is formed on the surface along the edge of the adhesive material; The incision extends from the surface to the resin laminate layer and is located closer to the resin laminate layer than the paper base material.

2. The paper substrate is 80 g / m ２ More than 200g / m ２ 10. The laminate of claim 1 having a basis weight of:

3. The laminate according to claim 1 or 2, wherein the resin laminate layer has a thickness of 10 μm or more and 40 μm or less.

4. A workpiece is prepared, which has a base layer, a pressure-sensitive adhesive layer, and a release liner in this order in the lamination direction, and the release liner has a paper base and a resin laminate layer provided on the pressure-sensitive adhesive layer side of the paper base; a blade is applied to the workpiece from the base material layer side, and an incision is formed by inserting the blade into the workpiece until the tip of the blade penetrates the base material layer and the pressure-sensitive adhesive layer, reaches the resin laminate layer of the release liner, and is positioned on the resin laminate layer side of the paper base material; a method for producing a laminate, wherein the base material layer and the pressure-sensitive adhesive layer surrounded by the incision are left, and excess base material layer and pressure-sensitive adhesive layer other than the remaining portions are peeled off and removed.

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