JP2002332460A - Adhesive double-sided tape - Google Patents

Abstract

(57) [Problem] To improve workability by reducing the thickness of a tape, at a low cost, and easily releasing a release paper. SOLUTION: An adhesive double-sided tape 1 is constituted by a two-layer structure of an adhesive resin layer 2 made of an adhesive resin and a release paper 3 arranged on one surface of the adhesive resin layer 2. One surface of the release paper 3 is an embossed surface 4 embossed by an embossing device, and a surface opposite to the embossed surface 4 is a smooth flat surface 5. Further, the flat surface 5 of the release paper 3 is coated with the adhesive resin layer 2 so that the release paper 3
And an adhesive resin layer 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an adhesive double-sided tape for adhering two members.

[0002]

2. Description of the Related Art Conventionally, there are two types of adhesive double-sided tapes of this type, those which do not use release paper and those which use release paper. FIG. 7 shows an adhesive double-sided tape 31 of the former type. The band-shaped double-sided adhesive tape 31 is wound around a cylindrical core material 32. FIG. 7B
7A is an enlarged cross-sectional view of a portion B in FIG. 7A. As shown in the drawing, the adhesive double-sided tape 31 includes a base material 33 and an adhesive resin layer 34 coated on both surfaces of the base material 33.
And a three-layer structure.

[0003] Adhesive double-sided tape 3 without using release paper
1 is a tape having an adhesive resin layer 34 on both sides thereof, so that the tape 1 is mounted in a support case 35 so as not to be adhered to others or to protect the adhesive resin layer 34 on the surface. .

FIG. 8 shows an adhesive double-sided tape 41 of the type using release paper.
Is wound around the core member 42 in the same manner as described above. FIG. 8B
8A is an enlarged cross-sectional view of a portion C in FIG. 8A. As shown, the adhesive double-sided tape 41 includes a base material 43 and an adhesive resin layer 44 coated on both surfaces of the base material 43.
And release paper 4 stuck on the upper surface side of one adhesive resin layer 44
5 and a four-layer structure.

The adhesive double-sided tape 31 shown in FIG. 7 which does not use release paper has an adhesive resin layer 34 coated on both sides, so that it cannot be carried as it is, and must be carried together with the support case 35 as described above. And it is inconvenient to carry.

On the other hand, the adhesive double-sided tape 41 using the release paper 45 shown in FIG. 8 is formed by bonding the release paper 45 having flat surfaces on both sides to the adhesive resin layer 44 to provide a support as shown in FIG. You can carry and work without a case. The adhesive double-sided tape generally used is the adhesive double-sided tape 41 shown in FIG. 8 in many cases.

[0007]

FIG. 9 and FIG.
The figure shows a case in which members 51 and 52 such as sheets of thin paper are adhered using an adhesive double-sided tape 31 or an adhesive double-sided tape 41. In the following description, the case where the adhesive double-sided tape 41 is used will be described.
The same applies to the case of.

The adhesive double-sided tape 41 is cut at a desired size, and the lower adhesive resin layer 44 is adhered to the surface of the lower member 52 with the release paper 45 facing upward without peeling the release paper 45. . After the adhesive double-sided tape 41 is bonded to the member 52, the release paper 45 on the surface is peeled off, and the upper member 51 is bonded to the upper adhesive resin layer 44, so that the upper and lower members 51, 52 are bonded via the adhesive double-sided tape 41. Will be adhered.

Such a handy double-sided adhesive tape 31, 4
Even if it is 1, there are many problems as described below. That is, after the release paper 45 is peeled off and adhered, as shown in FIG. 10, the base material 43 and the adhesive resin layers 4 on the upper and lower surfaces of the base material 43 are formed as an adhesive double-sided tape.
4, the adhesive double-sided tape is too thick. Therefore, the thin sheet-shaped member 5
When 1 and 52 are bonded together using an adhesive double-sided tape, only the portion of the adhesive double-sided tape 41 becomes thicker,
That portion protrudes from the other portions, resulting in poor appearance and reduced commercial value.

Further, the conventional adhesive double-sided tape 41 always requires a base material 43 because of the structure in which the adhesive resin layers 44, 44 are provided, and the base material 43 and the adhesive resin layers 44, 44 on both surfaces of the base material 43 are required. Due to the three-layer structure described above, there is a problem that the price is high. Furthermore, the thickness of the double-sided adhesive tape 41 is increased due to the three-layer structure, and the length of the core double-sided tape 41 is limited.
In addition, since the two-layered adhesive resin layer 44 is used, when the double-sided adhesive tape 41 is wound, the side surface becomes sticky,
Therefore, there is a problem that when the adhesive double-sided tape 41 is held, discomfort is given.

Further, the release paper 45 itself has flat surfaces on both sides and should be easy to peel off from the adhesive resin layer 44 as the name suggests. At present, even if the release paper 45 is to be peeled off after bonding to the base material 52, the release paper 3 is difficult to peel off because of the base material 43. Therefore, the adhesive double-sided tape 4
In the work of bonding using a large number of 1, the workability was very poor.

The present invention has been made in view of the above points, and has an object to provide a double-sided adhesive tape having a thin tape, low cost, and easy to release release paper to improve workability. Is provided.

[0013]

Therefore, in the pressure-sensitive adhesive double-sided tape according to the first aspect of the present invention, one surface is a minute projection surface 4 on which a number of minute projections are formed, and the other surface is a smooth flat surface 5. And a pressure-sensitive adhesive resin layer 2 in which a pressure-sensitive resin is disposed on the flat surface 5 side of the release member 3.

With such a configuration, unlike the conventional case, the base member is not used, and is constituted by two layers of the release member 3 and the adhesive resin layer 2 provided on one surface of the release member 3. Therefore, unlike the conventional example which is composed of three layers of the base material and the adhesive resin layer coated on both sides of the base material, the cost can be greatly reduced and the thickness of the tape itself can be reduced. be able to. Also, in the manufacturing process of the double-sided adhesive tape 1, embossing is performed on one surface of the release member 3, but the coating operation of the adhesive resin layer 2 is performed only once, so that the manufacturing process can be simplified as compared with the related art. Can be.

Also, unlike the conventional method using a base material,
Since no base material is used, the adhesive double-coated tape 1 can be provided with only the adhesive function of the adhesive resin layer 2. Furthermore, since only one adhesive resin layer 2 is used as a means for bonding both members 10 and 11, even if the members 10 and 11 are thin sheets, the bonded portions appear on the surfaces of the members 10 and 11. And the appearance is not impaired as in the prior art. Further, this does not lower the commercial value.

Further, since the double-sided adhesive tape 1 is composed of the single-layered adhesive resin layer 2 and the release member 3, the thickness of the double-sided adhesive tape 1 itself can be reduced. When the tape 1 is wound to the same diameter as the conventional one, the adhesive double-coated tape 1 having a length of 1.5 to 2 times as long as the conventional one can be wound. In addition, since the adhesive resin layer 2 is only one layer, the amount of the adhesive resin coating is reduced by half, and the amount of the adhesive resin used can be reduced by half, compared to the conventional adhesive resin layer having a two-layer structure. The cost can be reduced, and even when a large number of adhesive double-sided tapes 1 are wound, the sticky feeling on the side surface can be eliminated. Furthermore, for the same reason, the thickness of the adhesive double-sided tape 1 itself is reduced by 30% as compared with the conventional one.
５０50% thinner. Further, since a base material is not used unlike the related art, the use of the present invention not only for thin paper but also for exhibits, bags, and the like is very widespread. Further, since the base material is not used, the release member 3 is very easily peeled off, and the workability can be greatly improved.

In the pressure-sensitive adhesive double-sided tape according to the second aspect, the pressure-sensitive adhesive double-sided tape 1 is composed of the release member 3 and the pressure-sensitive adhesive resin layer 2, and is wound with the minute projection surface 4 of the release member 3 facing upward. It is characterized by:

As a result, the release member 3, the adhesive resin layer 2,
Since the release member 3 and the adhesive resin layer 2 are alternately positioned and the adhesive double-sided tape 1 is wound, the adhesive resin layer 2 is not exposed to the surface and the adhesive resin layer 2 does not stick to the hand. Therefore, it is easy to carry. Further, even if the adhesive double-sided tape 1 is released by the minute projection surface 4, it can be easily released from the adhesive resin layer 2.

In the pressure-sensitive adhesive double-sided tape according to the third aspect, a sheet-like release member having a smooth flat surface formed on one side, and an adhesive resin having an adhesive resin disposed on the flat surface side of the release member. A layer 15 and a release member 16 having a microprojection surface 22 having an infinite number of microprojections formed on one surface, and the microprojection surface 22 adhered to the adhesive resin layer 15 side. It is characterized by:

With this configuration, the minute projection surface 22
As a result, the release paper 16 can be easily peeled off from the adhesive resin layer 15, and unlike the conventional method, no base material is used, and only one adhesive resin layer 15 is used. Can also be simplified. The release member 14, the adhesive resin layer 15, and the release member 16 form the adhesive double-sided tape 13, and the adhesive double-sided tape 13 is formed into a sheet, which can be cut into an arbitrary size or shape and used.
The adhesive strength can be increased, so that the members 24,
For example, 25 can be used for bonding electronic components and the like. For example, when electronic components are mounted on the inner surface of a mobile phone case, the mounting is usually performed with screws, but by using the adhesive double-sided tape 13 of the present invention, screws are not required, and the body can be reduced in weight. Can be thin. Also, assembly can be performed easily. Of course, it can be used for any purpose.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) A first embodiment of the present invention will be described below in detail with reference to the drawings. 1 and 2, the present embodiment is an adhesive double-sided tape of a type in which a plurality of belt-shaped tapes are wound and used. The adhesive double-sided tape 1 is wound around a core material 6 in the same manner as in the related art.
The adhesive resin layer 2 has a two-layer structure with release paper 3 disposed on one surface. In particular, a feature of the present invention is that the base materials 33 and 43 used conventionally are not used. In addition,
FIG. 1B is an enlarged sectional view of a portion A in FIG.

Here, an embossed surface 4 is formed on one surface of the release paper 3 by embossed by an embossed device (not shown) so as to form countless minute projections. The opposite surface to the embossed surface 4 Is a smooth flat surface 5. The emboss pattern on the embossed surface 4 is a CM type,
HM type, H type, diamond type, etc., and a small pattern with a small surface protruding area are preferable examples. Further, the flat surface 5 of the release paper 3 is coated with an adhesive resin to form an adhesive resin layer 2.
To form a two-layer structure of release paper 3 and adhesive resin layer 2.

When the double-sided adhesive tape 1 is wound around the core member 6, as shown in FIG. 2, the double-sided adhesive tape 1 is wound so that the embossed surface 4 of the release paper 3 of the double-sided adhesive tape 1 is on the upper surface. Turning. Therefore, in a state where the adhesive double-sided tape 1 is wound, the embossed surface 4 of the release paper 3 of the lower adhesive double-sided tape 1 is adhered to the lower surface side of the adhesive double-sided tape 1. However, since one surface of the release paper 3 is the embossed surface 4, the contact area between the adhesive resin layer 2 of the upper double-sided adhesive double-coated tape 1 and the embossed surface 4 is different from the state of point contact by a large number of minute projections. Therefore, when the adhesive double-sided tape 1 is released, the upper adhesive resin layer 2 is easily peeled off from the lower release paper 3.

Here, the basis weight of the release paper 3 is 5
0g / m ² ~200g / m we use ^two things, after performing the embossing process of the concavo-convex on one surface of the release paper 3, the adhesive resin layer 2 by coating an adhesive resin layer on the flat surface 5
Is formed. The adhesive resin (adhesive resin layer 2) coated on the flat surface 5 of the release paper 3 is a connection film, and the surface on which embossing is performed on one side (embossed surface 4) is almost 100% The present inventor has found for the first time not to shift. Therefore, as described above, as shown in FIG.
Is released, the adhesive resin layer 2 is released while being adhered to the flat surface 5 of the release paper 3.

Next, the operation in the case where the adhesive double-sided tape 1 is used for adhesion will be described. First, as in the case of a normal tape, the adhesive double-sided tape 1 is cut by unwinding to a required dimension, and as shown in FIG. To the surface of the member 10 which is paper. Next, as shown in FIG. 3B, the release paper 3 is peeled from the adhesive resin layer 2, and in this case,
Since there is no base material 43 as in the related art, the release paper 3 is very easily peeled off. Then, as shown in FIG.
The member 11 is adhered to the pressure-sensitive resin layer 2 having only the layer from above.

As described above, in the pressure-sensitive adhesive double-sided tape 1 according to the present embodiment, unlike the related art, the base material is not used and the release paper 3 and the pressure-sensitive adhesive resin layer 2 coated on one surface of the release paper 3 are used. Since it is composed of two layers, unlike the conventional example composed of three layers of the base material and the adhesive resin layer coated on both sides of the base material, the cost can be greatly reduced and the tape can be reduced. The thickness of itself can be reduced.
Also, in the manufacturing process of the adhesive resin layer 2, although embossing is performed on one surface of the release paper 3, the coating process of the adhesive resin layer 2 is performed only once, so that the manufacturing process can be simplified as compared with the conventional method. it can.

Also, unlike the conventional method using a base material,
Since no base material is used, the adhesive double-coated tape 1 can be provided with only the adhesive function of the adhesive resin layer 2. Note that the adhesive double-sided tape 1 is required to have only the adhesive function of the adhesive resin layer 2, and from the viewpoint of the adhesive function, the base material is essentially unnecessary. Further, since only one adhesive resin layer 2 is used as a means for actually bonding the members 10 and 11 to each other, even if the members 10 and 11 are thin sheets, the bonding portion is the surface of the members 10 and 11. And does not impair the appearance as in the prior art. Further, this does not lower the commercial value.

Further, since the adhesive double-sided tape 1 is composed of the single adhesive resin layer 2 and the release paper 3, when the adhesive double-sided tape 1 is wound around the core material 6 to the same diameter as the conventional one, The adhesive double-sided tape 1 having a length of 1.5 to 2 times can be wound. Also, since there is only one adhesive resin layer 2, the amount of adhesive resin coating is reduced to one half and the amount of adhesive resin used can be reduced by half, compared to the conventional adhesive resin layer having a two-layer structure. Costs can be reduced. At the same time, even when a large number of adhesive double-sided tapes 1 were wound as shown in FIG. 1A, the sticky feeling on the side surfaces could be eliminated. Further, for the same reason, the thickness of the pressure-sensitive adhesive double-sided tape 1 itself can be reduced by 30% to 50% as compared with the related art. Further, since a base material is not used unlike the related art, the use of the present invention not only for thin paper but also for exhibits, bags, and the like is very widespread. Further, since the base material is not used, the release paper 3 is very easily peeled off, and the workability can be greatly improved.

The method of embossing the release paper 3 and the method of coating the flat surface 5 with an adhesive resin after embossing are well known and will not be described. The release paper 3 is a material generally used for an adhesive double-sided tape, and a thin film or nonwoven fabric made of a synthetic resin may be used instead of the release paper 3. Further, the width of the pressure-sensitive adhesive double-sided tape 1 may be appropriately widened according to the intended use as well as the width of a normal tape.

(Second Embodiment) Next, a second embodiment will be described with reference to FIGS. In the previous embodiment, the band-shaped adhesive double-sided tape was used.
The case of a sheet-shaped adhesive double-sided tape will be described. Even if one side of the release paper is coated with the adhesive resin layer as in the previous embodiment, since it is wound, the adhesive resin layer does not adhere to other portions due to the lower release paper. However, when the sheet-shaped release paper is coated with the adhesive resin layer, it is necessary to prevent the adhesive resin layer from adhering to other parts because the adhesive resin layer is exposed. Therefore, a release paper is separately disposed on the adhesive resin layer side as well, so that the adhesive double-sided tape has a sandwich structure.

FIG. 4 shows a sheet-shaped double-sided adhesive tape 13.
5 is an enlarged cross-sectional view of a main part of FIG. The release paper 14 has a flat surface 20 on both sides,
The adhesive resin layer 15 is formed by coating the entire lower surface of the flat surface 21 with an adhesive resin. The surface of the other release paper 16 on the side of the adhesive resin layer 15 is an embossed surface 22 similar to the previous embodiment, and the outer surface is a flat surface 23. Since the embossed surface 22 of the release paper 16 is adhered to the adhesive resin layer 15,
The embossed surface 22 facilitates peeling of the release paper 16. The flat surface 20 on the upper surface of the release paper 14
The flat surface 23 on the lower surface of the release paper 16 does not have to be a particularly smooth flat surface.

Since the release papers 14 and 16 are provided on both sides of the sheet-shaped adhesive double-sided tape 13, the adhesive resin layer 15 does not stick to the hand even if it is held by hand. When actually used, it is cut into a required size with scissors or the like, so that it can be cut into an arbitrary shape such as a circle or a polygon as well as a square, and used as a double-sided tape. Further, when using the adhesive double-sided tape 13 of the same size and shape, a large number of sheets are laminated and cut by a cutter at the same time for use.

After the adhesive double-sided tape 13 is cut into a predetermined size and shape, the release paper 16 having the embossed surface 22 as shown in FIG. 6A is peeled off. Since the surface where the release paper 16 is adhered to the adhesive resin layer 15 is provided with the embossed surface 22, the release paper 16 can be easily peeled off from the adhesive resin layer 15. At this time, the adhesive resin of the adhesive resin layer 15 does not migrate to the embossed surface 22 side by 100%, and the adhesive resin of the adhesive resin layer 15 adheres to the flat surface 21 side of the release paper 14.

Next, as shown in FIG. 6B, the adhesive resin layer 15 is adhered to the member 24, and then the release paper 14 on the upper side is peeled off. When the release paper 14 is peeled off, the release paper 14 can be easily peeled off from the adhesive resin layer 15 because there is no substrate unlike the conventional case. Further, as shown in FIG. 6C, by bonding the other member 25 to the adhesive resin layer 15, the other member 25 can be securely bonded to the member 24.

In this embodiment, the same effects as those described in the previous embodiment can be obtained. In particular, unlike the conventional case, the base material is not used and only one adhesive resin layer 15 is used, so that the cost can be reduced and the manufacturing process can be simplified. Further, the following effects can be obtained. That is, the adhesive double-sided tape 13 is formed into a sheet,
Since it can be used after being cut into an arbitrary size and shape, the adhesive strength can be increased, and therefore, the members 24 and 25 can be used for bonding electronic components and the like, for example. For example, when electronic components are mounted on the inner surface of a mobile phone case, the mounting is usually performed with screws, but by using the adhesive double-sided tape 13 of the present invention, screws are not required, and the body can be reduced in weight. Can be thin. Also, assembly can be performed easily. Of course, it can be used for any purpose.

In this embodiment, the release paper 1
4 and 16 may be made of a synthetic resin film or nonwoven fabric instead of paper.

In each of the above embodiments, the release papers 3, 16
The conditions such as temperature and speed in an embossing device (not shown) when forming the embossed surfaces 4 and 22 to form countless minute projections are as follows.
When the emboss pattern is, for example, an HM type, temperature: 50 ° C. to 100 ° C. speed: 20 m to 40 m per minute

The pressure when embossing is performed on the surfaces of the release papers 3 and 16 is a general pressure when embossing is performed on a paper material by an embossing device (not shown). Since this pressure value is not directly related to the present invention, it is omitted. However, the temperature is adjusted according to the depth of the embossed sculpture, and the temperature is adjusted by increasing the temperature for a shallow sculpture pattern and decreasing the temperature for a deep sculpture pattern. This temperature range is the above 50 ° C to 100 ° C
Range.

It should be noted that other methods may be used to form the innumerable minute protrusions. However, in the case of forming the innumerable minute protrusions on the surfaces of the release papers 3 and 16, it is preferable to perform embossing using an embossing device. It is.

In each of the above embodiments, the adhesive resin layers 2, 1 coated on the surfaces of the release papers 3, 14 are used.
The color 5 may be transparent, translucent, or a color of various colors. Further, in each of the above embodiments, the release paper 3,
Although the adhesive resin layers 2 and 15 were coated on the entire surface of the surface 14, the adhesive resin layers 2 and 15 were not coated over the entire surface, but followed the pattern, characters and the like.
15 may be coated on one surface of the release papers 3 and 14.

[0041]

According to the pressure-sensitive adhesive double-sided tape according to the first aspect of the present invention, unlike the prior art, the release member and the pressure-sensitive adhesive resin layer provided on one surface of the release member are used without using a base material. Since it is composed of two layers, the cost can be greatly reduced unlike the conventional example which is composed of three layers of the base material and the adhesive resin layer coated on both sides of the base material. Also, in the production process of the pressure-sensitive adhesive double-sided tape, embossing is performed on one surface of the release member, but the coating process of the pressure-sensitive adhesive resin layer is performed only once, so that the production process can be simplified as compared with the conventional method.

Unlike the conventional method using a base material,
Since no base material is used, only the adhesive function of the adhesive resin layer can be imparted to the adhesive double-sided tape. Furthermore, since only one adhesive resin layer is used as a means for bonding both members, even if the member is a thin sheet, the bonded portion is unlikely to appear on the surface of the member, which impairs the appearance as in the conventional case. Nor. Further, this does not lower the commercial value.

Further, since the adhesive double-sided tape is constituted by one adhesive resin layer and the release member, the thickness of the tape can be reduced. Therefore, the adhesive double-sided tape is wound around the core material to the same diameter as the conventional one. In this case, an adhesive double-sided tape 1.5 to 2 times as long as the conventional one can be wound. Also, since there is only one adhesive resin layer, the coating amount of the adhesive resin is half that of the conventional adhesive resin layer having a two-layer structure.
Thus, the amount of the adhesive resin used can be halved, the cost can be reduced by that amount, and even when a large number of adhesive double-sided tapes are wound, the sticky feeling on the side surface can be eliminated.
Further, for the same reason, the thickness of the pressure-sensitive adhesive double-sided tape itself can be reduced by 30% to 50% as compared with the related art. Further, since a base material is not used as in the related art, it can be used not only for thin paper but also for exhibits, bags, and the like. Further, since the base material is not used, the release member is very easily peeled off, and the workability can be greatly improved.

According to the pressure-sensitive adhesive double-sided tape of the second aspect,
The release member and the adhesive resin layer constitute an adhesive double-sided tape, which is wound with the microprojection surface of the release member facing upward, so that the release member, the adhesive resin layer, the release member and the adhesive resin layer are Adhesive double-sided tapes are wound alternately, so that the adhesive resin layer is not exposed on the surface and the adhesive resin layer is not attached to the hand, so that it is easy to carry. Further, even when the adhesive double-sided tape is unwound from the minute projection surface, it can be easily unwound from the adhesive resin layer.

According to the pressure-sensitive adhesive double-sided tape according to the third aspect,
The release paper can be easily peeled off from the adhesive resin layer by the micro-projection surface. Unlike the conventional method, no base material is used and only one adhesive resin layer is used. Can also be simplified. A release member, an adhesive resin layer, and a release member constitute an adhesive double-sided tape, and the adhesive double-sided tape is formed into a sheet shape, and can be used after being cut into an arbitrary size and shape. Therefore, it can be used as a member for bonding, for example, an electronic component. For example, when mounting an electronic component on the inner surface of a mobile phone case, it is usually performed by screwing, but by using the adhesive double-sided tape of the present invention, a screw is not required, the body can be reduced in weight, and at the same time, thinner. can do. Also, assembly can be performed easily. Of course, it can be used for any purpose.

[Brief description of the drawings]

FIG. 1A is a side view of an adhesive double-sided tape according to a first embodiment of the present invention. FIG. 2B is an enlarged sectional view of a portion A in FIG. 1A according to the first embodiment of the present invention.

FIG. 2 is an enlarged sectional view of a main part showing a state in which the pressure-sensitive adhesive double-coated tape according to the first embodiment of the present invention is laminated.

FIGS. 3 (a) to 3 (c) are explanatory diagrams showing a use state according to the first embodiment of the present invention.

FIG. 4 is a perspective view of an adhesive double-sided tape according to a second embodiment of the present invention.

FIG. 5 is an enlarged sectional view of a main part of an adhesive double-sided tape according to a second embodiment of the present invention.

FIGS. 6 (a) to 6 (c) are explanatory diagrams showing a use state according to the second embodiment of the present invention.

FIG. 7A is a side view of a conventional double-sided adhesive tape using no release paper. FIG. 8B is an enlarged sectional view of a portion B in FIG.

FIG. 8A is a side view of an adhesive double-sided tape in a case where release paper of a conventional example is used. FIG. 9B is an enlarged sectional view of a portion C in FIG.

FIG. 9 is a diagram illustrating a use state when a conventional adhesive double-sided tape is used.

FIG. 10 is an enlarged sectional view of a main part for explaining a problem of the conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Adhesive double-sided tape 2 Adhesive resin layer 3 Release paper 4 Embossed surface 5 Flat surface 6 Core material 13 Adhesive double-sided tape 14 Release paper 15 Adhesive resin layer 16 Release paper 21 Flat surface 22 Embossed surface 23 Flat surface

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Kozo Ichihara 29-6 Inabadai, Otsu-shi, Shiga F-term in Ichihara Co., Ltd. (Reference) 4J004 AB01 BA02 CE01 DB02 EA01 FA08

Claims (3)

[Claims] 1. One surface is a micro-projection surface (4) provided with countless micro-projections, and the other surface is a smooth flat surface (5).
And a pressure-sensitive adhesive double-coated tape comprising a pressure-sensitive adhesive resin layer (2) in which a pressure-sensitive resin is disposed on the flat surface (5) side of the release member (3). . 2. An adhesive double-sided tape (1) is constituted by the release member (3) and the adhesive resin layer (2), and is wound with the minute projection surface (4) of the release member (3) facing upward. The pressure-sensitive adhesive double-sided tape according to claim 1, wherein 3. A sheet-shaped release member (14) having a smooth flat surface (21) formed on one side, and a release member (1).
4) An adhesive resin layer (15) in which an adhesive resin is disposed on the flat surface (21) side, and a microprojection surface (22) having an infinite number of microprojections on one surface are formed. 22) a release member (16) adhered to the adhesive resin layer (15) side.