Next, the structure

Abstract

To provide an adhesive structure which is firmly adhered to an adherend, eliminates the need for troublesome cleaning and disposal of sawdust when removing it from the adherend, and can be easily separated without damaging the adherend. [Solution] An adhesive structure (1A) for detachably adhering a hook (3) to a wall (2) includes a sheet-like base layer (13) made of an EVA resin foam (131) with non-stretchable PET film layers (132) on both the front and back sides, and an adhesive layer (12) having one side adhered to the back side of the base layer (13) and the other side adhered to the wall (2). The adhesive layer is an elastic adhesive layer using an elastic adhesive that retains elasticity even after hardening and can be separated from the base layer (13) by a force that separates it in the shear direction. The other side of an adhesive layer (11) that adheres a base (31) of the hook (3) to one side is adhered to the surface of the base layer (13), and an inelastic adhesive layer using a non-elastic adhesive is used as the adhesive layer.

Description

[Technical Field]

[0001] The present invention relates to an adhesive structure that is detachably adhered to an adherend. [Background technology]

[0002] Generally, an attachment such as a wall hook is adhered to an adherend such as a wall or the vertical surface of furniture, electrical appliances, etc., using an adhesive structure such as a double-sided tape. Some double-sided tapes are easily releasable so as not to damage the adherend when the attachment is removed from the adherend.

[0003] However, while double-sided tape that ensures easy peeling does not pose any particular problems when used to attach lightweight objects, it may not be able to withstand the weight of heavy objects and may experience creep, making it unsuitable for hanging heavy objects.

[0004] Thus, a double-sided tape that does not have easy peelability has been known in the past, which includes a base layer made of a foam, adhesive layers provided on both the front and back sides of the base layer, and an extensible film provided between the base layer and each adhesive layer (see Patent Document 1). This type of double-sided tape is suitable for hanging heavy objects, even when attached to an adherend, because the elasticity of the base layer absorbs the load and prevents creep, even when a heavy object is attached to the adherend. On the other hand, when removing the double-sided tape from the adherend, the base layer is cut with a filament to separate it in the thickness direction, allowing it to be removed from the adherend. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent No. 6715577 Summary of the Invention [Problem to be solved by the invention]

[0006] However, in the case of adhesive structures such as the conventional double-sided tape, when removing the attachment from the adherend, the base layer needs to be cut off with a filament, which generates cutting chips from the base layer, making cleaning and disposal of the cutting chips extremely troublesome. Furthermore, depending on the material used for the adhesive structure, it may be difficult to completely remove the adhesive from the adherend, or part of the surface of the adherend may be peeled off and damaged when removed from the adherend.

[0007] The present invention has been made in view of the above points, and an object of the present invention is to provide an adhesive structure that is firmly adhered to an adherend, and can be easily separated without damaging the adherend, eliminating the need for troublesome cleaning and disposal of sawdust when removing the structure from the adherend. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides an adhesive structure that is separably adhered to an adherend, comprising: a sheet-like substrate layer made of a synthetic resin material; and an adhesive layer, one side of which is adhered to the back surface of the base layer and the other side of which is adhered to the adherend. The base layer is made of ethylene-vinyl acetate copolymer resin foam (hereinafter referred to as EVA resin foam), and non-stretchable polyethylene terephthalate film layers (hereinafter referred to as PET film layers) are provided on both the front and back sides of the ethylene-vinyl acetate copolymer resin foam. On the other hand, the adhesive layer is made of a silicone adhesive or a urethane adhesive. It is characterized by the following.

[0009] The surface of the base layer is bonded to one side of an adhesive layer having an adhesive body attached to the other side thereof, and the adhesive layer is A layer of silicone adhesive or urethane adhesive, or a layer of hardening epoxy adhesive is used. It's fine.

[0014] Further, between the elastic adhesive layer and the base material layer, Hardening epoxy adhesive A non-elastic adhesive layer may be interposed.

[0015] In addition, an extensible stretchable layer made of a synthetic rubber sheet may be interposed between the elastic adhesive layer and the base layer, so that the elastic adhesive layer and the base layer can be separated by the stretching force in the shear direction when the stretchable layer is stretched between them.

[0016] Furthermore, at least a portion of the stretchable layer may be provided with a tab that protrudes outward beyond the base layer. [Effects of the Invention]

[0019] In summary, the bonded structure of the present invention uses an elastic adhesive in the adhesive layer that remains elastic even after curing, and the load-absorbing effect of this elastic adhesive enables the bonded structure to be firmly bonded to the adherend. Meanwhile, the base material layer and the adhesive layer are separated by applying a shear force parallel to both surfaces between them without sawing through the base material layer. This eliminates the need for cleaning and disposing of the chips that are generated when sawing through the base material layer, which is extremely troublesome when removing the bonded structure from the adherend. By applying a force that separates the elastic adhesive layer and the base material layer in the shear direction, the elastic adhesive layer and the base material layer can be easily separated without damaging the adherend.

[0020] Furthermore, when a non-elastic adhesive is used as the adhesive layer between the base material layer and the adhesive body, the adhesive body can be firmly and separably adhered to the adherend by the adhesive structure.

[0021] On the other hand, if an elastic adhesive is used in the adhesive layer between the base layer and the adhesive body, the load absorption effect of this elastic adhesive makes it possible to more firmly adhere the adhesive body to the adherend, and the base layer and the adhesive layer can be separated by applying a shear force parallel to both sides of each other between the base layer and the adhesive layer without sawing through the base layer. This eliminates the need for cleaning and disposing of the sawdust that is generated when removing the adhesive body from the adherend, and the adhesive layer and the base layer can be easily separated by applying a force that separates them in the shear direction.

[0022] In particular, a silicone adhesive or an acrylic adhesive applied as the elastic adhesive layer can facilitate the separation effect on the base material layer when a separating force is applied in the shear direction. Among these, a silicone adhesive is preferred because a separating force easily acts between the elastic adhesive layer formed therefrom and the adherend when a shear force parallel to the adhesive layer surface is applied to the elastic adhesive layer formed therefrom.

[0023] In addition, the synthetic resin foam in the base layer provides elasticity to absorb vibrations, maintaining a stronger bond between the attachment and the adherend, ensuring adhesion to the adherend even when the attachment is relatively large and heavy. The use of EVA resin foam in particular reduces costs.

[0025] In addition, by interposing a non-elastic adhesive layer using a non-elastic adhesive between the elastic adhesive layer and the base material layer, the elastic adhesive layer bonds more strongly to the attachment layer than to the adherend, making it easier to separate from the adherend.

[0026] In addition, an extension layer made of a synthetic rubber sheet is interposed between the elastic adhesive layer and the base layer, and the elastic adhesive layer and the base layer can be separated by the extension force in the shear direction when this extension layer is stretched, so the elastic adhesive layer and the base layer can be easily separated by simply pulling the extension layer.

[0027] Furthermore, by providing a tab that protrudes outward beyond the base layer on at least a portion of the extensible layer, the synthetic rubber sheet can be easily pulled in the shear direction. [Brief explanation of the drawings]

[0030] [Figure 1] 1 is a perspective view showing a state in which an adhesive structure according to an embodiment of the present invention is used. [Figure 2] FIG. 2 is a side view of the bonded structure of FIG. 1. [Figure 3] 3 is a vertical cross-sectional side view showing the state before an attachment body is attached to the surface of the base material layer of the bonded structure of FIG. 2. FIG. [Figure 4]4 is a vertical cross-sectional side view showing a state in which an attachment body is attached to the surface of the base material layer of the bonded structure of FIG. 3. FIG. [Figure 5] FIG. 10 is a vertical cross-sectional side view showing a state before an attachment body is attached to the surface of a base material layer of an adhesive structure according to a modified example of the embodiment. [Figure 6] 6 is a vertical cross-sectional side view showing a state in which an attachment body is attached to the surface of the base material layer of the bonded structure of FIG. 5. FIG. [Figure 7] FIG. 10 is a vertical cross-sectional side view showing a state before an attachment body is attached to the surface of a base material layer of an adhesive structure according to another modified example of the embodiment. [Figure 8] 8 is a vertical cross-sectional side view showing a state in which an attachment body is attached to the surface of the base material layer of the bonded structure of FIG. 7. FIG. [Figure 9] FIG. 10 is a vertical cross-sectional side view showing a state before an attachment body is attached to the surface of a base material layer of an adhesive structure according to another modified example of the embodiment. [Figure 10] 10 is a vertical cross-sectional side view showing a state in which an attachment body is attached to the surface of the base material layer of the bonded structure of FIG. 9. FIG. [Figure 11] FIG. 10 is a longitudinal sectional side view showing a state before an adhesive body is attached to an adhesive layer portion of an adhesive structure according to another modified example of the embodiment. [Figure 12] 12 is a vertical cross-sectional side view showing a state in which an adhesive body is attached to the surface of the adhesive layer of the bonded structure of FIG. 11. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0031] The following describes in detail the embodiments of the present invention with reference to the drawings, but the present invention is not limited to the following examples.

[0032] Fig. 1 is a perspective view showing a state in which an adhesive structure according to an embodiment of the present invention is used, and Fig. 2 is a side view of the adhesive structure of Fig. 1. As shown in Fig. 1, reference numeral 1 denotes an adhesive structure that is adhered to a wall 2 as an adherend, and that adheres a hook 3 as an attachment object. The hook 3 comprises a substantially rectangular plate-shaped base 31 and a substantially J-shaped locking portion 32 attached to the surface of the base 31.

[0033] Fig. 3 is a longitudinal side view showing the state before the hooks 3 are attached to the surface of the base layer of the bonded structure 1 of Fig. 2. As shown in Fig. 3, a first bonded structure 1A is used as the bonded structure 1. An EVA resin foam 131 is used as the base layer 13 of this bonded structure 1A, and non-stretchable PET film layers 132 are provided on both the front and back sides of the EVA resin foam 131. In this case, the expansion ratio of the EVA resin foam 131 can be determined as appropriate, but is preferably 1.1 to 10 times. The thickness of the non-stretchable PET film 132 is preferably 5 μm to 500 μm, and particularly preferably 5 μm to 20 μm.

[0034] An elastic adhesive layer 12 (adhesive layer) using a silicone adhesive as an elastic adhesive is provided on the back surface (left side surface in FIG. 3) of the base layer 13 of the adhesive structure 1A, via a non-stretchable PET film 132. The silicone adhesive applied to this elastic adhesive layer 12 is an elastic adhesive that remains elastic even when hardened. In this case, the silicone adhesive is applied in a fluid state to the back surface side of the base layer 13, and remains soft and elastic even when hardened over time.

[0035] The adhesive structure 1A includes an adhesive layer 11 (inelastic adhesive layer) whose other side (left side in FIG. 3 ) is attached to the surface (right side in FIG. 3 ) of the base layer 13. The back surface (left side in FIG. 3 ) of the base 31 of the hook 3 is attached to one side (right side in FIG. 3 ) of the adhesive layer 11. In this case, an inelastic adhesive that loses elasticity after hardening is used for the adhesive layer 11. As such an inelastic adhesive, a known adhesive such as a curing epoxy adhesive can be used, or double-sided tape can also be used. An elastic adhesive, as described below, may also be used. Furthermore, in FIG. 3 , the hook 3 is shown with the adhesive layer 11 already attached. However, the adhesive structure 1A may be configured as a double-sided tape by attaching the back surface of the hook base to one side of the adhesive layer whose other side is attached to the surface of the base layer. Furthermore, double-sided tape or adhesive may be applied to the back surface of the hook base before adhering it to the surface of the base layer, or double-sided tape or adhesive may be applied to the surface of the base layer before adhering the back surface of the hook base.

[0036] When the adhesive structure 1A is used to adhere the hook 3 to the wall 2, the elastic adhesive layer 12 (silicone adhesive layer) on the back surface of the base layer 13 of the adhesive structure 1A is pressed against the wall 2 to adhere it, and then the attachment layer 11 of the hook 3 is pressed against the surface of the base layer 13 to adhere it, thereby adhering the wall 2 and the hook 3 via the adhesive structure 1A. Note that the order of adhesion is not limited to this, and the operation of pressing the hook 3 against the attachment layer 11 to adhere it may be performed first.

[0037] Next, an example of a method for peeling the bonded structure 1A from the wall 2 will be described with reference to FIG.

[0038] Fig. 4 is a longitudinal sectional side view showing a state in which an attachment body is attached to the surface of the base material layer of the bonded structure of Fig. 3. As shown in Fig. 4, bonded structure 1A is adhered to wall 2 via elastic adhesive layer 12 made of an elastic adhesive.

[0039] Here, the fishing line or string is held at a distance of about 10 cm and pressed against the elastic adhesive layer 12 from above while sliding it horizontally. This operation causes a force to act between the elastic adhesive layer 12 and the base layer 13, separating them in the shear direction, and this force separates the elastic adhesive layer 12 from the base layer 13. Separation here means that the adhesive structure 1A is separated at the interface between the elastic adhesive layer 12 and the base layer 13, but also includes cases where some of the elastic adhesive layer 12 remains on the base layer 13. In the latter case, some of the elastic adhesive of the elastic adhesive layer 12 will remain on the wall 2, but it will not remain if it is rubbed off from the wall 2 by hand.

[0040] In this way, the adhesive structure 1A uses an elastic adhesive layer 12 made of an elastic adhesive that remains elastic even when hardened as an adhesive layer, so the load absorption effect of the elastic adhesive allows the adhesive structure 1A to be firmly adhered to the wall 2.

[0041] On the other hand, by applying a shearing force parallel to both surfaces between the elastic adhesive layer 12 and the base material layer 13 without cutting through the base material layer 13, the base material layer 13 and the elastic adhesive layer 12 are separated. This eliminates the need to clean up and discard the cuttings of the base material layer 13, which is extremely troublesome when removing the bonded structure 1A from the wall 2, and by applying a separating force in the shearing direction between the elastic adhesive layer 12 and the base material layer 13, the elastic adhesive layer 12 and the base material layer 13 can be easily separated without damaging the wall 2.

[0042] Next, a modification of this embodiment will be described with reference to FIG.

[0043] Fig. 5 is a longitudinal sectional side view showing a state before an adhesive body is attached to the surface of the base material layer of an adhesive structure according to a modified embodiment. As shown in Fig. 5, a second adhesive structure 1B is used as the adhesive structure 1.

[0044] The adhesive structure 1B uses only a PP resin sheet 133 that has been surface-treated on both sides as the base layer 13. Surface treatment here refers to processing both sides of the PP resin sheet by chemical, physical (thermal), mechanical, or other methods. The surface treatment allows the elastic adhesive layer 12, in which a silicone adhesive is applied as an elastic adhesive to both sides of the PP resin sheet 133, to adhere firmly, thereby firmly adhering the three components 133, 11, and 12. Furthermore, the PP resin sheet 133 has excellent transparency, so the design is not impaired even when transparent or translucent hooks are used.

[0045] The bonded structure 1B includes an elastic adhesive layer 12 in which a silicone adhesive is applied as an elastic adhesive to the back surface of a base layer 13. The base 31 of the hook 3, which is bonded to the wall surface 2 by this bonded structure 1B, is bonded to the surface of the base layer 13 of the bonded structure 1B by an adhesive layer 11. In this case, the bonded structure 1B may be configured as a double-sided tape, with the elastic adhesive layer 12, base layer 13 (P resin sheet 133), and adhesive layer 11 arranged in this order from the wall 2 side.

[0046] Fig. 6 is a longitudinal sectional side view showing a state in which an adhesive body is attached to the surface of the base material layer of the bonded structure of Fig. 5. In Fig. 6, the method for peeling the bonded structure 1B from the wall 2 can be the same as that for the bonded structure 1A described above.

[0047] Fig. 7 is a longitudinal sectional side view showing the state before an adhesive body is attached to the surface of a base layer of an adhesive structure according to another modified embodiment. In Fig. 7, a third adhesive structure 1C is used as the adhesive structure 1. This adhesive structure 1C includes a non-elastic adhesive layer 10 using a non-elastic adhesive between an elastic adhesive layer 12 to which a silicone adhesive is applied as the elastic adhesive of the adhesive structure 1A shown in Fig. 3 and a non-stretchable PET film 132 of a base layer 13. This non-elastic adhesive layer 10 has the same composition as the adhesive layer 11 located symmetrically with respect to the center of the base layer 13.

[0048] An elastic adhesive layer 12 to which a silicone-based adhesive is applied as an elastic adhesive is provided on the back surface (left side surface in Figure 7) of the base material layer 13 of the adhesive structure 1C shown on the left of Figure 7, i.e., the back surface (left side surface in Figure 7) of the non-elastic PET film 132.

[0049] The adhesive structure 1C also includes an elastic adhesive layer 12 and a non-elastic adhesive layer 10, in which a silicone adhesive is applied as an elastic adhesive to the back surface of a base layer 13. The base 31 of the hook 3, which is attached to the wall surface 2 by the adhesive structure 1C, is attached to the surface of the base layer 13 of the adhesive structure 1C by an adhesive layer 11. In this case, the adhesive structure 1C may be configured as a double-sided tape, with the elastic adhesive layer 12, the non-elastic adhesive layer 10, the base layer 13, and the adhesive layer 11 arranged in this order from the wall 2 side.

[0050] Fig. 8 is a longitudinal sectional side view showing a state in which an adhesive body is attached to the surface of the base material layer of the bonded structure of Fig. 7. In Fig. 6, the method for peeling the bonded structure 1B from the wall 2 can be performed in the same manner as for the bonded structure 1A described above.

[0051] Fig. 9 is a longitudinal sectional side view showing a state before an attachment body is attached to the surface of a base layer of an adhesive structure according to another modified embodiment. In Fig. 9, a fourth adhesive structure 1D is used as the adhesive structure 1. This adhesive structure 1D includes an extension layer 14 made of a synthetic rubber sheet provided between an elastic adhesive layer 12 to which a silicone adhesive is applied as the elastic adhesive of the adhesive structure 1A shown in Fig. 3 and a non-stretchable PET film 132 of the base layer 13. A known synthetic rubber sheet can be used as this extension layer 14, and it may also be an elastomer sheet.

[0052] The bonded structure 1D also has an adhesive layer 11 made of a non-elastic adhesive on the surface of the non-stretchable PET film 132 of the base material layer 13. The base 31 of the hook 3 that is bonded to the wall surface 2 by this bonded structure 1D is bonded by the adhesive layer 11 to the surface of the base material layer 13 of the bonded structure 1D.

[0053] FIG. 10 is a longitudinal side view showing the state in which hooks 3 are attached to the surface of the base layer 13 of the bonded structure 1D of FIG. 9 . As shown in FIG. 10 , the end of the tensile layer 14 is provided with a tab 15 that protrudes outward from the end of the base layer 13 to facilitate gripping. By literally pinching and pulling this portion with the fingers, the tab 15 exerts a shearing force between the elastic adhesive layer 12 to which the silicone adhesive is applied and the non-stretchable PET film 132 when the tensile layer 14 is stretched, separating the two layers 12 and 132. The tab 15 need only be large enough for a person to grip, and at least a portion of the tensile layer may protrude outward from the end of the base layer. In this case, the bonded structure 1D may be configured as a double-sided tape, consisting of, in order from the wall 2 side, the elastic adhesive layer 12, the tensile layer 14, the base layer 13, and the adhesive layer 11.

[0054] Fig. 11 is a longitudinal side view showing a state before an attachment body is attached to the surface of a base layer of an adhesive structure according to another modified embodiment. In Fig. 11, a fifth adhesive structure 1E is used as the adhesive structure 1. This adhesive structure 1E includes an elastic adhesive layer 12 to which a silicone adhesive is applied as the elastic adhesive of the adhesive structure 1A shown in Fig. 3, a base layer 13 made of a non-stretchable PET film 132 as a non-stretchable sheet, and an extensible double-sided tape 16 provided between the base layer 13 and the base 31 of the hook 3. The extensible double-sided tape 16 may be any tape as long as it is stretchable, and is not particularly limited.

[0055] The extensible double-sided tape 16 functions as an adhesive layer with the other side adhered to the surface of the non-stretchable PET film 132 of the base layer 13, and has one side to which the base 31 of the hook 3 is attached.

[0056] Figure 12 is a longitudinal side view showing the state in which hooks 3 are attached to the surface of the extensible double-sided tape 16 of the adhesive structure 1E of Figure 10. In Figure 12, the adhesive structure 1B can be peeled off from the wall 2 in the same manner as in the adhesive structure 1A described above.

[0057] 12, the extensible double-sided tape 16 has an end portion provided with a gripping portion 15 that protrudes outward from the end portion of the base layer 13 to make it easier to grip. By literally gripping and pulling this portion with the fingers, an elongation force in the shear direction acts between the base 31 of the hook 3 and the non-stretchable PET film 132 (base layer 13), causing the extensible double-sided tape 16 to come out from between the base 31 of the hook 3 and the non-stretchable PET film 132, and separating the two.

[0058] In this manner, in this modified example, not only can the elastic adhesive layer 12 and the non-stretchable PET film 132 (base layer 13) be separated by a force that separates them in the shear direction, but also the attachment body 3 can be easily separated from the non-stretchable PET film 132 on the wall 2 side by the stretching force of the stretchable double-sided tape 16 that stretches in the shear direction when the stretchable double-sided tape 16 is pulled.

[0059] In this embodiment and each modification, a wall 2 is used as the adherend, but the adherend may also be a room window, a side wall of furniture, a refrigerator, a tiled wall, or the like. In the case of room walls, the adhesive tape can be applied to wallpaper-covered walls, which are becoming more common these days, as well as well-known materials such as wood. Furthermore, the adhesive tape can be used without any problems even on wallpaper-covered walls with some unevenness, and even in the case of wallpaper-covered walls, the adhesive structure can be separated without peeling off any of the wallpaper.

[0060] Furthermore, in this embodiment and each modification, the hook 3 is used as the attachment object, but the attachment object may also be a shelf, a thin iron plate, etc. If a magnetic material such as a thin iron plate is selected as the attachment object, other magnetic hooks or the like can be used on the magnetic material portion, and a hook using a magnet can be applied to a non-magnetic wall or the like. [Explanation of symbols]

[0061] 1, 1A, 1B, 1C, 1D, 1E Adhesive structure 10. Inelastic adhesive layer 11 Adhesion layer 12 Elastic adhesive layer 13 Base material layer 131 EVA foam 132 Non-stretchable PET film 133 PP resin sheet 14. Extension layer (synthetic rubber sheet) 15 Knob 16 Stretchable double-sided tape (adhesive layer) 2 Wall (adherent) 3 Hook (attachment) 31 Foundation 32 Locking part

Claims

1. An adhesive structure that is separably adhered to an adherend, a sheet-like base layer made of a synthetic resin material; an adhesive layer having one side bonded to the back surface of the base material layer and the other side bonded to the adherend; Equipped with The base layer is made of an ethylene-vinyl acetate copolymer resin foam, and non-stretchable polyethylene terephthalate film layers are provided on both the front and back surfaces of the ethylene-vinyl acetate copolymer resin foam. The adhesive structure is characterized in that a silicone adhesive or a urethane adhesive is used as the adhesive layer.

2. An adhesive layer having an adhesive body attached to one side thereof is adhered to the surface of the base layer, and the other side of the adhesive layer is adhered to the surface of the base layer.

2. The bonded structure according to claim 1, wherein the adhesive layer is a layer made of a silicone adhesive, a urethane adhesive, or a layer made of a curable epoxy adhesive.

3. An adhesive structure as described in claim 1, wherein a layer of curing epoxy adhesive is interposed between the adhesive layer and the base material layer.

4. A stretchable extension layer made of a synthetic rubber sheet is interposed between the adhesive layer and the base layer, The adhesive structure according to any one of claims 1 to 3, wherein the adhesive layer and the base material layer are separable by the shear extension force generated when the extension layer is stretched between them.

5. An adhesive structure as described in Claim 4, wherein at least a portion of the extension layer has a tab portion that protrudes outward beyond the base layer.

6. An adhesive structure as described in claim 1, wherein a non-elastic adhesive layer using a curing type epoxy adhesive is interposed between the adhesive layer and the base material layer.

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