JP2002322440A - Bonding tape, method for bonding, and for coating the substrate - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an adhesive tape used as a bonding tape, capable of preventing sticking out of an adhesive from edges of the adhesive tape. SOLUTION: This adhesive tape 43 is, formed by giving one of both the surfaces of a PET(polyethylene terephthalate) film 41 a concaved part 41a which locates on an area inward apart from both the edges of the film at a interval of 2 mm and has a depth of about 10 μm and applying the adhesive 42 of acrylic type to the concaved part 41a. Even when two webs 70, 71 are together bonded by using the adhesive tape 43, made to be continuous in length, and subjected to various coating, the adhesive 42 is prevented from sticking out because of being kept in the concaved part 41a, so that adhering of contaminants to a coated surface and other troubles are not caused. Further, decrease of bonding strength caused by contact of the adhesive 42 with a coating liquid is suppressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bonding tape for bonding a support, a method for bonding a support using the bonding tape, and a method for coating the bonded support.

[0002]

2. Description of the Related Art Adhesive tapes are made of plastic films,
It is used as a tape for joining paper or a thin metal foil, a laminated sheet thereof, or a strip-shaped flexible support (hereinafter, referred to as a web) made of these materials. As the adhesive tape, one obtained by directly applying an adhesive to a tape base or one obtained by applying an adhesive on both sides of very thin paper or the like and attaching the same to the tape base is used. Various types of paper, various types of plastic films, metal foils such as aluminum, or laminates thereof, and various types of metals and metal oxides on paper, plastic films, etc. are used for the tape base of the adhesive tape. Thinly coded ones are used.

[0003] In the production of conventional optical films, when applying a coating solution to a web, a web as long as possible is used in order to reduce the loss of the web. Therefore, a method has been adopted in which the webs are joined together to form a long web and are continuously applied at once. Web Joining
As shown in FIG. 10 (a), adhesive tapes 12 are adhered from both front and back surfaces of the webs so that the end faces of the webs 10 and 11 do not overlap. Also, the adhesive tape 12
Are affixed over the width direction of the web as shown in FIG. As another method, there is a method in which a plurality of adhesive tapes 13 are attached so as to intersect the end faces of the webs 10, 11 as shown in FIG. further,
As shown in FIG. 12, there is also a method in which ends of two webs 14 and 15 are overlapped and an adhesive tape 16 is attached.

Even if the web is bonded with an adhesive tape by any of the methods, there has been a problem that uneven coating of the coating solution, streaks, or coating abnormalities such as local thickening and thin coating are apt to occur at the bonded portion. . For this reason, when applying a web having a joint, a method for reducing the loss due to the abnormal application was required. For example, Japanese Patent Application Laid-Open No. 58-88074 discloses a method in which an application head is separated from an application position immediately before a joint is applied, and is returned to an original position after the joint passes. Further, in Japanese Patent No. 2,632,265, a black layer is provided at a joint portion, and the surface potential is 0.5 to
A method for charging to 2.0 kV is disclosed. According to these methods, it is possible to reduce various coating abnormalities caused by a change in the wettability of the coating liquid at the web and the joint by the adhesive tape.

[0005]

However, even with the above method, there is a problem that the failure due to the protrusion of the adhesive from the adhesive tape cannot be reduced. FIG.
Reference numeral 3 denotes a coating apparatus using an extrusion coater method. The web 21 delivered from the delivery device 20 is:
The rollers are conveyed to the extrusion coater 24 by the rollers 22 and 23. Extrusion coater 24
Then, the web 21 supported by the backup roller 25
Is applied with a coating liquid. Next, the web 21
The paper 6 is sent through the dryer 27 and dried. The dried web 21 is conveyed by pass rollers 28 and 29 and wound up by a winder 30.

[0006] In the coating device, depending on the surface in contact with the web,
Two types of rollers are provided in combination. These are a roller in contact with the application surface of the web (hereinafter referred to as the application surface side roller 22) and a roller in contact with the surface on which the web is not applied (hereinafter referred to as the opposite surface side roller 23). Similarly, the pass rollers 28, 29 are also composed of the application surface side roller 28 and the opposite surface side roller 29.

[0007] When the web is conveyed by these rollers, the problem of adhesive bleeding occurs. When the adhesive tape is adhered to the application surface side and the web 21 is joined, the adhesive tape joining the web 21 is squeezed by the application surface roller 22, and a phenomenon occurs that the adhesive protrudes from the end of the adhesive tape. . The small amount of adhesive that has overflowed contaminates the roller and transfers it to the subsequent web 21. This causes an abnormal application surface when the application liquid is applied to the web 21. Further, after the web 21 is sent out from the dryer 27, a similar problem occurs with the application surface side roller 28 of the pass roller, which causes a failure such as adhesion of foreign substances on the application surface later. This problem occurs even when the web 21 is bonded using the adhesive tape on the surface opposite to the application surface. That is, the adhesive tape is ironed by the opposite rollers 23 and 29 to stain the rollers,
Transfer to subsequent web. Further, when the web is wound up, the web is transferred to the coating surface side, causing a failure with foreign matters and the like. In the coating apparatus, since the coating side rollers 22 and 28 and the opposite side rollers 23 and 29 are combined, the problem of adhesive protrusion is an unavoidable problem when the webs are joined by the adhesive tape. .

In addition, when the joining portion is continuously applied, depending on the type of application liquid, the application liquid penetrates from the end of the adhesive tape, and there is a problem that the joining strength is reduced.

SUMMARY OF THE INVENTION It is an object of the present invention to provide a joining tape that prevents the adhesive from protruding from the end of the tape and prevents the application liquid from permeating from the end of the tape, thereby preventing a decrease in joining strength. It is.

Another object of the present invention is to provide a method for joining webs by using the joining tape. Still another object is to provide a method for applying a coating liquid to a web joined by the joining tape.

[0011]

Means for Solving the Problems To solve the above-mentioned problems, a bonding tape according to the present invention provides a bonding tape comprising a support and an adhesive layer applied or affixed to one surface of the support. Forming the adhesive layer inside the widthwise end surface of the support, and depressing the layer surface of the adhesive layer from the adhesive layer non-layer surface of the peripheral portion of the support. ing. Thereby, the adhesive or the adhesive member is held by the tape base, and it is possible to prevent the adhesive from protruding from the tape base. Furthermore, since the contact between the adhesive layer and the coating liquid becomes difficult, it is possible to prevent a decrease in the bonding strength of the adhesive layer due to the penetration of the coating liquid.

The length of the non-adhesive layer surface in the width direction of the support is 0.2 to 5 mm, and the depth of the recess of the adhesive layer from the peripheral edge of the support is 0.005 mm. ~ 0.
1 mm, the product thickness of the adhesive layer is 5 to 300 μm
m is preferable. Further, it is preferable to perform fine unevenness processing on the surface on which the adhesive layer is provided.

[0013] The present invention also includes a web joining method in which the end of the web is joined using a joining tape, wherein the joining tape described above is used.

Further, the present invention includes a method of applying a web having a joining portion joined by a joining tape, wherein the method employs any of the joining tapes described above.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be described below. The tape base of the adhesive tape is made of polyethylene terephthalate (PET) or polyethylene naphthalate (PE) which has been subjected to coloring processing, translucent processing, or various kinds of vapor deposition processing.
N), plastic films such as polyimide and polypropylene (PP), metal foils such as aluminum, various papers, and laminates thereof are mainly used. Among these materials, plastic films such as polyethylene naphthalate (PEN) and polyimide, various papers, and laminates thereof can be preferably used in the present invention. When used as a laminate, it is preferable to use the tape base material on the surface to which the adhesive is applied. Further, among them, polyethylene terephthalate (PET) is preferably used.

The thickness of the tape substrate is from 10 μm to 200
It is preferably up to μm. More preferably, from 25 μm to 1
00 μm. The width of the tape is not particularly limited, but is preferably from 10 mm to 100 mm.

The surface on which the adhesive of the tape substrate according to the present invention is provided (hereinafter referred to as a concave portion) can take various forms. In FIG. 1, a concave portion 41a is formed in the tape base material 41,
4 shows an adhesive tape 43 to which an adhesive 42 has been applied. The tape base 41 has a rectangular recess 41a. The recess 41 a is formed leaving a distance d from the end of the tape base 41. That is, in the width direction of the tape base material, the recess 41 a
Has been processed. In this case, if the distance d is too small, the adhesive 42 protrudes from the processing surface of the concave portion 41a, and the effect of preventing the adhesive from protruding is reduced. On the other hand, if the distance d is too large, the surface of the tape substrate on which the adhesive is not applied becomes large, which causes peeling when the web is joined after forming the adhesive tape from the tape substrate. Also,
In this case, since the joining portion of the web is difficult to adhere, there is also a problem that the web is caught in a narrow gap portion in the transport path when the application liquid is applied to the web. In the present invention, the distance d
Is preferably from 0.5 mm to 5 mm, more preferably from 0.5 mm to 2 mm. The processing surface of the concave portion 41a has a depth t from the tape base material surface of 0.005.
mm to 0.1 mm is preferred. More preferably 0.0
It is from 08 mm to 0.06 mm. The depth t of the recess is 0.
If it is less than 005 mm, the effect of the concave portion holding the adhesive becomes insufficient, and a phenomenon that the adhesive protrudes occurs. On the other hand, if the depth t of the concave portion is larger than 0.1 mm, the amount of the adhesive to be applied becomes excessive, which is not preferable from the viewpoint of cost increase of the adhesive tape.

In the present invention, the recess formed in the tape substrate is not limited to a rectangular shape. For example, a concave portion 45a having an arc-shaped side surface is formed like a tape base 45 of the adhesive tape 44 shown in FIG.
2 may be applied. FIG. 3 shows another embodiment.
A concave portion 47a having a trapezoidal cross section and an adhesive 42 may be applied, like the tape base material 47 of the adhesive tape 46 shown in FIG. As described above, the concave portion formed in the tape substrate may have various shapes as long as the concave portion is provided inside the surface of the tape substrate.

Further, as shown in an adhesive tape 48 shown in FIG. 4, the surface on which the adhesive layer is provided in the concave portion 49a of the tape base material 49 may be subjected to fine unevenness processing. The holding effect is improved. Tape base 49 shown in the figure
The groove 49b is provided on the surface on which the adhesive is provided to form irregularities, and the adhesive 42 is applied to the recess 49a so as to fill the groove 49b. The groove 49b is formed in a lattice shape or an oblique line shape with respect to the tape base material 49. In the present invention, there is no limitation on the shape, size, depth, arrangement, and the like of the groove 49b. Also, the groove 4 formed in the same concave portion 49a
9b need not have the same shape, size, depth, and the like. The maximum opening width of the groove 49b is 10 μm to 5 μm.
000 μm is preferred. More preferably, it is 30 μm to 1000 μm. It is appropriate that the depth of the groove 49b is 2 μm to 300 μm. In the present invention, the processing of the fine unevenness is not limited to the method of providing the groove,
A method of providing a protrusion on the surface of 9a may be used.

As described above, the recesses in which the adhesive is provided are filled with the adhesive 42, and the respective adhesive tapes 43, 44,
46 and 48 are formed. As the adhesive 42, various commercially available ones, for example, an acrylic adhesive, an epoxy adhesive, a polyester adhesive, a polyurethane adhesive, a phenol adhesive, and the like can be used. However, in the present invention, the adhesive is not limited to these.

The thickness of the adhesive 42 applied is preferably large enough to slightly protrude from the recess. This coating thickness is 5 μm to 300 μm, more preferably 8 μm to 100 μm when completed as an adhesive tape. An extrusion coater, a roll coater, or the like is suitable as a method of coating the concave portions. Further, the adhesive tape of the present invention,
An adhesive member in which a double-sided tape having an adhesive on both sides is attached instead of the adhesive may be used. The adhesive applied to the tape substrate may be an adhesive, or a double-sided tape having an adhesive on both sides may be attached.

FIG. 5 is a plan view of the adhesive tape 43 shown in FIG. The adhesive tape 43 is formed in a long strip shape, and the concave portion 41 a
Is formed and an adhesive 42 is provided at the center. However, the adhesive tape of the present invention is not limited to the form shown in FIG. For example, as shown in FIG.
0, the recesses 50a are formed intermittently, and
A perforated cutting line 50b may be formed between them, and the adhesive 42 may be further provided in the recess 50a. In this case, by being cut along the cutting line 50b and used,
The adhesive 42 does not protrude from the peripheral edge of the adhesive tape 51.

Next, a method of forming a concave portion in the tape base material and forming an adhesive tape will be described with reference to FIG. The apparatus for forming the adhesive tape includes a heating roller 60 and a pressing unit 6.
1, an adhesive application section 62 and a dryer 63. After the tape base 41 is heated by the heating roller 60, a depression (see FIG. 1) is formed on the surface by the pressing unit 61. Subsequently, in the adhesive application section 62, the pickup roller 64 lifts the adhesive 42 from the adhesive tank 65. The adhesive 42 is coated by the coating roller 66 on the surface of the tape base 41 on which the concave portions are formed. Finally, the adhesive tape 43 is obtained while being dried while being conveyed by the rollers 67 in the dryer 63. Thus, pressure is applied to the surface of the tape base material 41 to plastically deform the tape base material 41 to form a concave portion on the surface, and then the adhesive is applied to form the adhesive tape 43.

FIG. 8 shows a cross section of a main part of the pressurizing section 61 shown in FIG. The pressure unit 61 includes a pressure roller 68 and a backup roller 69. As the pressure roller, a steel material or the like whose surface has been subjected to a hardening treatment such as nickel-chrome plating treatment of 1 to 10 μm thickness, nitriding treatment, and titanium nitride treatment of 0.3 to 5 μm thickness is used. Are provided with convex portions 68a corresponding to concave portions formed in the tape base material. Various rollers can be used as the backup roller.
A rubber roller is used. The pressure roller 68 is disposed on the backup roller 69 with the tape base 41 interposed therebetween, and presses the tape base 41, and forms a concave portion in the tape base 41 by the convex portion 68 a. The applied pressure varies depending on the material, but is about 0.3 to 50 kg / cm ² . In the illustrated example, four consecutive recesses are formed in the width direction, and four adhesive tapes are later formed using a slitter or the like.
The number of the projections 68a may be changed as appropriate.

When the tape base is formed from a polymer such as PET, it is effective to heat the tape base with a heating roller or the like. Pressing the tape substrate while heating or immediately after heating is a preferable method because the recess is formed in a short time. As the heating, a method using a heating roller having a heating mechanism inside the pass roller, a method using a heating furnace to heat before pressing, a method using the above heating roller and heating simultaneously with pressing can be used. However, even when a polymer such as PET is used for the tape substrate, it is not always necessary to heat. Further, the processing of the concave portion is not limited to the method using pressure. If an adhesive that does not require a dryer is selected, the drying may be a method of natural drying.

FIG. 9 shows the function of joining the webs with the adhesive tape 43 shown in FIG. Adhesive tape 4
The tape substrate 41 of No. 3 has a concave portion 41a formed on the surface thereof. An adhesive 42 is provided to fill the concave portion 41a. The webs 70 and 71 have their end faces approaching and facing each other, and the surfaces thereof are joined by an adhesive tape 43. As described above, since the adhesive 42 is housed in the concave portion 41a, the tape base 41 can be exposed to external force.
It does not protrude. In addition, the adhesive 42 is
Since it is housed in a, contact and permeation with the application liquid when applying the application liquid are suppressed, and a decrease in bonding strength of the adhesive is suppressed.

The adhesive tape of the present invention can be applied to a joining method for joining both the front and back surfaces of a web as shown in FIG. Further, as shown in FIG. 11, the present invention can be applied to a method of providing a plurality of adhesive tapes in the width direction of a web and joining the webs. Further, as shown in FIG. 12, the present invention can be applied to a method in which a part of the web is overlapped and joined with an adhesive tape.

The web bonded with the adhesive tape of the present invention is
The coating liquid is applied by a conventional coating device as shown in the figure. Regardless of whether the web 21 fed from the feeding device 20 is squeezed by the application surface rollers 22 and 28 and the opposite surface rollers 23 and 29, the adhesive is held in the concave portion of the tape substrate. It does not protrude. The ironing force of the roller is absorbed by the elastic force of the polymer because the adhesive is formed from the polymer. For this reason, the protrusion of the adhesive due to the ironing action of the roller can be suppressed, the dirt on the roller due to the protrusion can be suppressed, and the failure of the application surface can be reduced. As described above, according to the present invention, the protrusion of the adhesive from the adhesive tape can be suppressed without improving the conventional coating machine.

FIG. 13 shows an embodiment using the extrusion coating method. However, the present invention can be used in any of a slide bead coating method, a curtain coating method, a bar coating method, a roll coating method, and the like in which a web is transported by a roller. Furthermore, the present invention is not limited to these methods, and can be applied to any device that rubs the adhesive tape with a roller.

[0030]

EXAMPLES The present invention will be described below in detail with reference to examples, but embodiments of the present invention are not limited thereto. The execution conditions will be described in detail by a first embodiment. The materials and methods of Examples 2 to 5 and Comparative Examples 1 to 3 are the same as those of Example 1 unless otherwise specified.

Example 1 A film of polyethylene terephthalate (PET) having a thickness of 40 μm and a width of 60 mm was used as the tape base of the adhesive tape. On one side of the tape base, about 10 mm inward from the film edge
The rectangular concave portion shown in FIG. 1 was formed at a depth of μm using a heating roll. Next, an adhesive was applied to the rectangular concave portions of the PET film to form an adhesive tape. An acrylic adhesive was used as the adhesive. Further, a PET film having a thickness of 70 μm and a width of 1200 mm was used for the web. A sample was prepared by attaching the adhesive tape to both the front and back surfaces of the two webs along the face where the end faces were brought together. This sample was continuously applied by a coating machine including the bonding surface by an extrusion coating method. Coating conditions, coating amount, 80 cc / m ^2, coating speed was 70m / min. The coating liquid was 10 parts by weight of an acrylic resin, 2 parts by weight of a pigment, and surfactant.
One having a composition ratio of 01 parts by weight, methyl ethyl ketone 65 parts by weight, methanol 20 parts by weight, and methylene glycol 5 parts by weight was used. After the application, the sample was taken out from the winding portion and the applied surface was observed, but there was no abnormality in the surface state. In addition, the end of the adhesive tape at the joint was confirmed in detail, but no protruding adhesive was found on the end face of the adhesive tape.

Comparative Example 1 A web was bonded under the same conditions as in Example 1 except that the entire surface of the tape substrate was a smooth surface, and coating was performed under the same conditions. Observation of the coated surface after coating revealed that fine cissing defects were found on the coated surface after the joint.
Pieces / m ² , and 12 pieces / m ^{2 of} foreign matter adhesion failure were found.

Example 2 A concave portion having an arc-shaped concave portion on both sides shown in FIG. 2 at a depth of about 10 μm and 1.5 mm inward from the film edge was formed on one side of a PET film as a tape base material. To form an adhesive tape. The method of preparing and applying the sample is the same as in Example 1. When the coated surface after the application was observed, no abnormality was found in the surface state. In addition, the end of the adhesive tape at the joint was confirmed in detail, but no protruding adhesive was found on the end face of the adhesive tape.

Comparative Example 2 A web was bonded under the same conditions as in Example 2 except that the entire surface of the tape substrate was smooth, and coating was performed under the same conditions. On the coated surface after the joint, fine repelling defects were found at 7 / m ² , and foreign matter adhesion defects were found at 14 / m ² .

Example 3 On one side of a PET film as a tape base material, about 1 mm inward from a film edge 2 mm from the film edge.
A trapezoidal concave portion shown in FIG. 3 was formed at a depth of 3 μm using a heating roll to prepare an adhesive tape. The preparation of the sample is the same as in the first embodiment. This sample was continuously applied under the conditions of an application amount of 90 cc / m ² and an application speed of 55 m / min. When the coated surface after the application was observed, no abnormality was found in the surface state. In addition, the end of the adhesive tape at the joint was confirmed in detail, but no protruding adhesive was found on the end face of the adhesive tape.

Comparative Example 3 A web was bonded under the same conditions as in Example 3 except that the entire surface of the tape substrate was a smooth surface, and coating was performed under the same conditions. On the coated surface after the joint, fine repelling defects were found 5 / m ² , and foreign matter adhesion failures were found 8 / m ² .

Example 4 A trapezoidal concave portion shown in FIG. 3 was formed on one side of a PET film as a tape base material at a depth of about 13 μm 0.15 mm inward from the film edge using a heating roll. Then, an adhesive tape was made. The method of preparing and applying the sample is the same as that of the third embodiment. Observation of the applied surface after application revealed that fine repelling defects were 2 / m ² and foreign material adhesion defects were 3 / m ^{2 on} the applied surface after the joint. Further, when the edge of the adhesive tape at the joint was confirmed in detail, a slight protrusion of the glue was found on the end face of the adhesive tape. From the film edge of the tape base,
Since the concave portion was formed inside 0.15 mm, the effect of the concave portion holding the adhesive was not sufficient.

[Example 5] On one side of a PET film as a tape base material, about 1 mm inward of 2 mm from the film edge.
A rectangular concave portion was formed at a depth of 0 μm using a heating roll. A groove is formed on the peripheral surface of the heating roller at a position corresponding to the concave portion, and the concave and convex processing is performed together with the formation of the concave portion as shown in FIG. Due to the unevenness processing, the opening width 40μm,
A large number of rectangular grooves 49b having a depth of 3 μm are formed. Next, an adhesive was applied by filling the grooves of the PET film and applying an adhesive to the rectangular recesses. The method of preparing and applying the sample is the same as in Example 1. When the coated surface after the application was observed, no abnormality was found in the surface state. Also,
The end of the adhesive tape at the joint was confirmed in detail, but no protruding adhesive was found on the end face of the adhesive tape.

[0039]

According to the adhesive tape of the present invention, since the surface on which the adhesive layer of the tape base material is provided is formed as a concave portion, the adhesive is held in the concave portion and the adhesive protrudes from the tape base material. Is suppressed. Further, since the adhesive layer is formed inside the end face in the width direction of the support, penetration of the coating liquid is suppressed, and a decrease in bonding strength of the adhesive is suppressed. Further, when applying a web bonded using the adhesive tape of the present invention, the protrusion of the adhesive is suppressed, and the occurrence of a foreign matter failure or the like due to the protrusion of the adhesive is eliminated. The adhesive tape of the present invention is also applicable to joining webs and applying a coating liquid to the joined webs.

[Brief description of the drawings]

FIG. 1 is a sectional view of an adhesive tape according to the present invention.

FIG. 2 is a sectional view of another embodiment of the adhesive tape according to the present invention.

FIG. 3 is a sectional view of another embodiment of the adhesive tape according to the present invention.

FIG. 4 is a sectional view of another embodiment of the adhesive tape according to the present invention.

FIG. 5 is a plan view of the adhesive tape shown in FIG.

FIG. 6 is a plan view of another embodiment of the adhesive tape according to the present invention.

FIG. 7 is a schematic view of a production line for producing an adhesive tape according to the present invention.

FIG. 8 is a cross-sectional view of a main part of a pressing unit that forms a concave portion of the adhesive tape according to the present invention.

FIG. 9 is a cross-sectional view in which webs are joined by the adhesive tape shown in FIG.

FIG. 10 is a side view showing an embodiment in which webs are joined by a conventional adhesive tape.

FIG. 11 is a plan view showing another embodiment in which webs are joined by a conventional adhesive tape.

FIG. 12 is a side view showing another embodiment in which webs are joined by a conventional adhesive tape.

FIG. 13 is a schematic view of an apparatus for applying a coating liquid to a web.

[Explanation of symbols]

 41, 45, 47, 49, 50 Tape base material 42 Adhesive 43, 44, 46, 48, 51 Adhesive tape 60 Heating roller 61 Pressing unit 62 Adhesive application unit 63 Dryer 64 Pickup roller 65 Adhesive tank 66 Coating Roller 68 Pressure roller 68a Convex part 69 Backup roller 70, 71 Web

Continued on front page F term (reference) 4D075 AC04 AC23 DA04 DA31 DA32 DB07 DB18 DB31 DB48 DB53 DB63 DC40 EA35 EB22 EB32 EB33 EB35 EB38 4J004 AA10 AA12 AA13 AA14 AA15 CA02 CA04 CA06 CA08 CB02 CC04 CC06 CD07 CE03 FA08

Claims (5)

[Claims] 1. A bonding tape comprising a support and an adhesive layer applied or affixed to one surface of the support, wherein the adhesive layer is formed inside an end face in a width direction of the support. A bonding tape, wherein the surface of the adhesive layer on which the adhesive layer is provided is more dented than the surface of the peripheral portion of the support where the adhesive layer is not provided. 2. A method according to claim 1, wherein the length of the non-adhesive layer in the width direction of the support is 0.2 to 5 mm, and the depth of the recess of the adhesive layer from the peripheral edge of the support is 0.005 mm. ~ 0.1m
2. The bonding tape according to claim 1, wherein the thickness of the adhesive layer in the product is 5 to 300 [mu] m. 3. The bonding tape according to claim 1, wherein the surface on which the adhesive layer is provided is subjected to fine unevenness processing. 4. A web joining method for joining an end portion of a web using a joining tape, wherein the joining tape according to any one of claims 1 to 3 is used. 5. A method for applying a web having a joining portion joined by a joining tape, wherein the joining tape according to any one of claims 1 to 3 is used.