JPS60245681A - Method for treating lateral side of wound pressure-sensitive adhesive tape - Google Patents

Abstract

PURPOSE:To ensure prevention of the blocking of a wound pressure-sensitive adhesive tape, by using a sheet having a specified pressure-sensitive adhesive layer non-compatible with the pressure-sensitive adhesive layer of the wound pressure-sensitive adhesive tape and sticking the adhesive layer side of the sheet on the lateral side of the wound tape. CONSTITUTION:A pressure-sensitive adhesive sheet composed of a substrate and a pressure-sensitive adhesive layer which is provided on one side of the substrate, has Young's modulus of 0.5-10kg/cm<2> and is non-compatible and non-reactive with the pressure-sensitive adhesive layer of a pressure-sensitive adhesive tape described below is used. The pressure-sensitive adhesive layer side of each of said adhesive sheets 2, 2' is sticked on each of lateral sides 1A, 1A' of a wound pressure-sensitive adhesive tape 1 in which a pressure-sensitive adhesive tape composed of a support and a pressure- sensitive adhesive layer provided thereon is wound into a laminate. A thermoplastic resin film is particularly preferred as the substrate for the sheet 2, 2'. When Young's modulus is less than 0.5kg/cm<2>, the adhesive layer is liable to be united with the adhesive layer of the wound tape, while when Young's modulus exceeds 10kg/cm<2>, the adhesive layer can not be stuck on the side of the tape.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for treating the side surface of an adhesive tape wound laminate formed by winding and laminating adhesive tape such as a single-sided adhesive tape, a double-sided adhesive tape, or an anticorrosion tape.

Generally, adhesive tapes such as single-sided adhesive tapes, double-sided adhesive tapes, or anticorrosive tapes are used in a state where they are wound and laminated on a core, but this type of wound laminate has an adhesive layer supported on the side. Because the rolls are cut and arranged together with the body, if, for example, 5 or 10 rolls are packaged together, the sides of the stack of rolls may stick to each other and cause blocking, making it impossible to separate them easily.

For this reason, when a plurality of adhesive tape wound laminates are packaged together, a release paper such as a paper is usually inserted between the wound laminates. but,
When wrapping a large number of adhesive tape-wound laminates, there is a problem that inserting a mount for each laminate is very time-consuming and poor packaging work efficiency.

In order to solve this problem, an attempt has been made to prevent the blocking by applying a cross-linked silicone treatment liquid to the side surface of the adhesive tape-wound laminate and curing the adhesive layer in the area facing the side surface. ing.

According to the method using this cross-linked silicone-based treatment liquid, the surface of the adhesive layer facing the adhesive tape-wound laminate is hardened, so even if multiple pieces are packaged at the same time, blocking will not occur and the packaging process will be easier. Gender issues will be resolved.

However, according to this method, the adhesive layer in the adhesive tape is hardened in the shape of edges at both ends in the width direction of the tape, so when the adhesive tape is rewound and attached to an adherend, A void with a triangular cross section is created. For this reason, even if the above-mentioned adhesive tape uses a transparent support, there is a problem in that both edges of the tape become clear and the appearance after application becomes unsightly.

In addition, when anticorrosion tape is wrapped spirally around pipes such as gas pipes and water pipes, voids with a triangular cross section are created along the side edges of the tape where they overlap, and air and moisture can easily enter and cause corrosion of the pipes. Furthermore, since this void forms a continuous gap along the outer circumference of the piping, once moisture and other corrosion-causing substances forcefully infiltrate, the void will spread throughout the void and cause corrosion over a wide range, resulting in corrosion protection. There is a problem in that it significantly reduces the

On the other hand, there is a method in which a thermoplastic resin film is applied to the side surface of the adhesive tape-wound laminate, and then the film is pressed with a heated material close to the melting temperature of the film so that it adheres to the side surface of the adhesive tape-wound laminate. However, if the temperature of the film does not reach close to the melting temperature of the film and is slightly lower, the film will not adhere to the side surface, and -1 - the temperature control of the film is very poor. There is a problem.

In view of the above-mentioned circumstances, the present invention provides a method that can reliably prevent blocking when multiple adhesive tape wound laminates are packaged together, and without reducing workability during packaging. If the adhesive tape is rewound and pasted, it may cause voids and problems when used.
This was done with the aim of providing a new method.

That is, the present invention provides an adhesive tape provided on one side of a base material on the side surface of an adhesive tape wound laminate formed by winding and laminating adhesive tapes having a configuration in which an adhesive layer is provided on a support. Young's modulus of 05 to 10 kg without compatibility and chemical reactivity with the adhesive layer in the above adhesive tape
This invention relates to a method for treating the side surface of an adhesive tape-wound laminate, which is characterized in that a pressure-sensitive adhesive sheet comprising an adhesive layer of CRD is applied from the adhesive layer side.

The adhesive tape wound laminate whose side surface has been treated by the method of the present invention is a pressure-sensitive adhesive sheet having a specific adhesive layer on the side surface, or is pasted from this adhesive layer side. Blocking will not occur when multiple pieces are packaged together.In addition, when performing the above packaging, there is no need to insert a release paper such as interleaving paper between the rolled laminates. The workability is good.

Furthermore, the adhesive layer of the pressure-sensitive adhesive sheet attached to the side surface of the adhesive tape-wound laminate has a specific range that does not have compatibility and chemical reactivity with the adhesive layer of the wound laminate. Since the adhesive tape is hard and has a Young's modulus of The adhesive tape can be rewound without any problems when used, and there is no change in the rewound adhesive tape, unlike in conventional methods using cross-linked silicone-based processing liquids. There are no problems such as voids, and the original characteristics of the adhesive tape can be exhibited.

In addition, the pressure-sensitive adhesive sheet can be easily attached to the side surface of the adhesive tape-wound laminate by simply bringing the pressure-sensitive adhesive sheet into contact with the side surface marked with "-" and pressing it. There is no problem that temperature control is difficult when adhering to the above-mentioned side surface as in the method using.

The adhesive tape-wound laminate to which the side surface treatment method of the present invention is applied refers to a support such as paper, nonwoven fabric, or woven fabric, or a synthetic resin film such as polyolefin film or polyvinyl chloride film. The base polymer is made of comb, synthetic rubber, (meth)acrylic acid alkyl ester polymer, epoxy resin, etc., and an adhesive layer is provided by adding tackifiers, resins, and various fillers as necessary. Consists of single-sided adhesive tape,
It is usually made by winding and laminating double-sided adhesive tape, anticorrosion tape, etc. around a core.

There are no particular restrictions on the support and adhesive layer described in ``2'', and commonly used materials are widely included, but the Young's modulus of the adhesive layer is usually 1 to 8 Kg/cr&
It is better to be at a certain level.

The pressure-sensitive adhesive sheet that is attached to the side surface of the above adhesive tape-wound laminate has a structure in which a specific adhesive layer is provided on one side of a base material. Paper, woven fabric, nonwoven fabric, various plastic films, and the like are widely used as the base material for this pressure-sensitive adhesive sheet.

The thickness of this base material is usually preferably about 0.01 to 2.0 mm; if this thickness is too thin, there is a risk that this base material will break when the adhesive tape-wound laminate is unwound. However, thick plowing is uneconomical and undesirable.

As this base material, various materials can be used as described above, but thermoplastic resin films are particularly preferred among these. When this film is used as a base material, the first
As shown in the figure, sides IA and I of the adhesive tape-wound laminate]
Pressure-sensitive adhesive sheet 2.2' is brought into contact with A', and then the second
As shown in the figure, adhesive sheets 2 and 2' are placed on the side surfaces jA and 1A', and a metal plate heated to around the melting temperature of the thermoplastic resin film that is the base material of the adhesive sheet 2. 3 and 3', the adhesive sheet 1- is applied only to the side surfaces 1A and 1A' of the wound laminate 1, as shown in FIG.
2.2' will be pasted. This is because only the portion of the adhesive sheet 2.2' that comes into contact with the side surface of the wound laminate becomes molten when pressed by the metal plate 3.3', so the protruding portion of the adhesive sheet 2.2' This is because it is cut at the boundary with.

When a thermoplastic resin film is used as the base material of a pressure-sensitive adhesive sheet in this manner, the adhesive sheet can be attached only to the side surface of the adhesive tape-wound laminate with good workability.

The plastic resin film used is one made of polyethylene, polypropylene, vinyl acetate copolymer, or vinyl chloride, or a mixture of two or more of them. .05
The thickness is preferably about 0.2 mm.

Next, the adhesive layer in the pressure-sensitive adhesive sheet has no compatibility or chemical reactivity with the adhesive layer in the adhesive tape-wound laminate, and has a Young's modulus of 05~] OK
It is important that it be relatively hard, in the fl/crrf range.

The adhesive layer in the drying sheet is formed using an adhesive composition containing a base polymer and optional additives such as tackifiers and fillers. Each component is added to the adhesive layer described in "2".
It is necessary to use a material that does not impart chemical reactivity to the adhesive layer in the adhesive tape wound laminate.

In addition, as the base polymer described in ``2'', a polymer having no compatibility with the base polymer contained in the adhesive layer of the adhesive tape wound laminate is used. Specific examples include butyl rubber, neoprene comb, nitrile rubber, polyurethane, acrylic resin, and natural comb.
Use polyisobutylene etc.

The adhesive layer formed using the above adhesive composition has a Young's modulus of 05 to IO1 (glod, preferably 1 to 8 kg/
It is necessary that it be in the range of c1iI. When the Young's modulus is less than 0.5 Kg/crj, the cohesive force of the adhesive layer is so low that the soft adhesive tape easily impregnates the side surface of the wound laminate and becomes integrated with the adhesive layer in the wound laminate.

If the Young's modulus exceeds OKg/ci, the adhesive layer will have a high cohesive force and become too hard, resulting in insufficient adhesiveness and no adhesion to the side surface of the wound laminate.

The Young's modulus within the above range can be easily achieved by adjusting the blending ratio of each component of the adhesive composition used to form the adhesive layer. Also,
The Yafugu ratio can also be adjusted by including a crosslinking agent in the composition and crosslinking the pressure-sensitive adhesive layer.

However, in this case, it is necessary to ensure that no unreacted crosslinking agent remains in the adhesive layer. If unreacted crosslinking agent remains, a crosslinking reaction may occur between the adhesive layer in the adhesive tape wound laminate and the adhesive layer in the adhesive sheet, which is not preferable.

The thickness of the adhesive layer in the above adhesive sheet is usually 0.
1 to I 00 ""-, more preferably 1 to 15μ. If this thickness is too thin, the adhesion force to the side surface of the adhesive tape wound laminate will be too low and the adhesive sheet will easily peel off, and if it is too thick, the adhesive force will increase and it will be difficult to unwind the wound laminate. This is not desirable because it is both uneconomical and uneconomical.

In order to perform side surface treatment of the adhesive tape-wound laminate using the pressure-sensitive adhesive sheet configured as described above, first, as shown in FIG. 1, the side surface I A of the adhesive tape-wound laminate 1,
], Abut pressure-sensitive adhesive sheet) 2.2' on A'. The size of this adhesive sheet 2.2' is usually made larger than the above-mentioned side surfaces I A and I A' from the viewpoint of workability.

Then apply the adhesive sheet 2.2' to the side 1A.

Press the entire surface of IA'. This suppression work is usually carried out on the metal plates 3 and 3' as shown in FIG.
It is usually enough to press from both sides of A' for about a few seconds to 1 to 2 minutes. At this time, the suppression time can be shortened by heating the metal plates 3, 3', and normally, from the viewpoint of workability, the metal plates 3, 3' are heated so that this time ranges from several seconds to about 20 to 30 seconds. It is best to set the temperature at 3'.

In addition, when a thermoplastic resin film is used as the base material for the adhesive sheet 2, 2', the temperature of the metal plates 3, 3' should be set to a temperature close to the melting temperature of the film, preferably this temperature. When the temperature is slightly higher than the melting temperature, the side surface IA7 of the adhesive tape-wound laminate 1 as shown in FIG.
G. is preferable because adhesive sheet) 2.2' can be pasted only on 1A'.

In this case, it is preferable that the surfaces of the metal plates 3, 3' be coated with Teflon or coated with a non-fusion film such as a polyester film to prevent the thermoplastic resin film from adhering.

On the other hand, if a material other than a thermoplastic resin film is used as the base material in the adhesive sheet 1-2.2', or even if a thermoplastic resin film is used, the metal plate 3
, 3' is lower than the melting temperature of this film, the pressure-sensitive adhesive sheet (2') attached to the side surfaces IA, IA' of the adhesive tape-wound laminate 1.
+2' is usually the above side IA.

Since it protrudes from IAI', it is preferable to cut out this protruding portion. This cutting can be easily performed because the adhesive sheet 2.2' is adhered to the side surfaces IA and IA'.

Note that the side surface treatment method of the present invention can be carried out on an assembly line using a conveyor. That is, the adhesive tape wound laminate is transported by a conveyor or the like, strip-shaped pressure-sensitive adhesive sheets are brought into contact with the transported wound laminate one after another, the adhesive sheets are then pressed with a metal disc, and then the rolled laminate is rolled. Cut the laminated body into pieces one by one. At the time of separation, if necessary, cut off the portion of the pressure-sensitive adhesive sheet that protrudes from the side surface of the wound laminate.

In the conventional method of inserting a release paper such as interleaving paper, the size of the release paper needs to be considerably larger than the side surface of the adhesive tape-wound laminate because this insertion work is done manually. There were problems in that the release paper protruding from the sides became a hindrance, making packaging difficult or increasing the packaging volume.

On the other hand, in the method of the present invention, since the pressure-sensitive adhesive sheet is adhered to the side surface of the adhesive tape-wound laminate, if there is a portion of the adhesive sheet protruding from the side surface, it can be easily cut off. In addition, when performing side treatment in an assembly line as described above, the width of the pressure-sensitive adhesive sheet to be attached to the wound laminate should be approximately the same as the diameter of the wound laminate. Therefore, the protruding part of the adhesive sheet can be relatively reduced by simply cutting off the adhesive sheet after pasting, and this protruding part can become an obstruction and make it difficult to package or the packaging volume is too large. Because it does not cause problems such as
It is not necessarily necessary to cut out the protruding part.

Examples of this invention will be described below. In addition, in the following, parts mean parts by weight.

Example 1 5 parts of incyanate crosslinking agent was mixed with 100 parts of an acrylic copolymer obtained by copolymerizing acrylic acid butyl ester, acrylonitrile, and acrylic acid at a ratio of 100:20:5 (weight ratio). An acrylic adhesive composition was obtained.

The above acrylic adhesive composition was coated on one side of a 60 μn thick polyethylene film formed by extrusion molding of low density polyethylene and dried to form an acrylic adhesive layer with a thickness of 10 parts m. An adhesive sheet was obtained. The Young's modulus of the above adhesive layer is 2 Kg/cr! Met.

Adhesive composition as an adhesive tape wound laminate, comprising a support made of polyvinyl chloride with a thickness of 270/'l, and a tackifier and a filler containing natural rubber as a main component on one side of this support. Thickness 130 formed by coating and drying
JI11 Young's Modulus], 11 (g/ffl) A single-sided adhesive tape composed of a natural rubber adhesive layer and a layer of a natural rubber adhesive was wound and laminated.

The pressure-sensitive adhesive sheet described above is brought into contact with both sides of this adhesive tape-wound laminate from the acrylic adhesive layer side, and then the adhesive sheet is pressed for 15 seconds with a metal plate whose surface temperature is 20°C to stick it. Ta. Next, the protruding portion of the pressure-sensitive adhesive sheet from the side surface was cut off.

Example 2 Pressure-sensitive adhesive sheets similar to those in Example 1 were brought into contact with both sides of the same adhesive tape-wound laminate as in Example 1 from the acrylic adhesive layer side, and then a metal plate with a surface temperature of 150'C was attached. The adhesive sheet was pressed for 15 seconds to adhere. During this pressing, the protruding portions of the pressure-sensitive adhesive sheet from the side surfaces were removed, and the pressure-sensitive adhesive sheet was provided only on both sides of the wound laminate.

Example 3 An adhesive made of polyisobutylene (molecular weight 1 million) was applied to one side of a 60 mm thick film made by extrusion molding a mixture of polyethylene and polypropylene in a ratio of 10:90 (weight ratio), and dried. A polyisobutylene pressure-sensitive adhesive layer having a thickness of 1.0 m was formed on the side to obtain a pressure-sensitive pressure-sensitive adhesive sheet. ”−
The adhesive layer had a Young's modulus of 2 h/d.

The above pressure-sensitive adhesive sheet was brought into contact with both sides of the same adhesive tape-wound laminate as in Example 1 from the polyisobutylene adhesive layer side, and then the above pressure-sensitive adhesive sheet was placed on a metal plate with a surface temperature of 1.50°C. It was pasted by pressing for 15 seconds. During this pressing, the protruding portions of the adhesive sheet from the side surfaces of the wound laminate were removed, so that the adhesive sheet was provided only on both sides of the wound laminate.

Example, 1 Acrylic acid butyl ester and acrylic acid 100:10
(Weight ratio) 05 parts of incyanate crosslinking agent was blended with 100 parts of the acrylic copolymer used and copolymerized to obtain an acrylic pressure-sensitive adhesive composition.

The above adhesive composition was coated on one side of the same polyethylene film as in Example 1 and dried to form an acrylic adhesive layer having a thickness of IQ) tm to obtain a pressure sensitive adhesive sheet. The Young's modulus of the adhesive layer was Kg/cytl.

As adhesive tape wound laminate, thickness I 70. "A support made of polyvinyl chloride, and an adhesive composition consisting of natural rubber as a main component and a tackifier blended on one side of this support was applied and dried to form a Young's adhesive composition with a thickness of 3Q/1m. A single-sided adhesive tape composed of a natural rubber adhesive layer with a ratio of 1.h/d was used.

The above-mentioned pressure-sensitive adhesive sheet was brought into contact with both sides of this adhesive tape-wound laminate from the natural rubber adhesive layer side, and then the above-mentioned pressure-sensitive adhesive sheet was pressed for 15 seconds with a metal plate whose surface temperature was 50'C. Pasted. During this pressing, the protruding portion of the adhesive sheet from the side surface of the wound laminate is removed.
The i-wear sheet was provided only on the above-mentioned side surface.

Example 5 An acrylic pressure-sensitive adhesive composition was obtained by blending 10 parts of an incyanate crosslinking agent with 100 parts of a polymer consisting of butyl acrylate, acrylonitrile, and acrylic acid in a weight ratio of 100:30:5. Ta.

The above-mentioned adhesive composition was coated on one side of the same polyethylene film as in Example 1 and dried to form an acrylic adhesive side piece having a thickness of 10) m to obtain a pressure-sensitive adhesive sort. The Young's modulus of the adhesive layer was 8 K (1/C1d).

The above pressure-sensitive adhesive sheet was brought into contact with both sides of the same adhesive tape-wound laminate as in Example 4 from the acrylic adhesive layer side, and then the above pressure-sensitive adhesive sheet was heated for 20 minutes on a metal plate with a surface temperature of 150'C. I pressed it for a second and it stuck. During this pressing, the protruding portion of the pressure-sensitive adhesive sheet (1) from the wound laminate was removed, and the pressure-sensitive adhesive sheet was provided only on the side surface.

Comparative example Acrylic acid butyl ester and acrylic acid 100:5
An acrylic pressure-sensitive adhesive composition was obtained by blending 1 part of an isocyanate crosslinking agent with 100 parts of an acrylic copolymer copolymerized using (weight ratio).

The above acrylic adhesive composition was applied to one side of the same polyethylene film as in Example 1 and dried to a thickness of 0/IM.
An acrylic adhesive layer was formed to obtain a pressure-sensitive adhesive sheet. , "The Young's modulus of the desiccating agent 1@ is 0.4 Ky/
It was crd.

The above pressure-sensitive adhesive sheet was brought into contact with both sides of the same adhesive tape-wound laminate as in Example 1 from the acrylic adhesive layer side, and then the above pressure-sensitive adhesive sheet was placed on a metal plate with a surface temperature of 20°C. It was pressed and pasted for 15 seconds. Next, the protruding part from the side of the adhesive sheet was cut off.

When a plurality of adhesive tape-wound laminates having been side-treated in Examples 1 to 5 and Comparative Example were packaged together, the wrapping process was successful without any of the pressure-sensitive adhesive sheets peeling off. I was able to do it. Furthermore, no blocking occurred in the wound laminate packaged in this manner.

Furthermore, when the adhesive tape-wound laminate that had been subjected to the above-mentioned side treatment was rewound and wrapped around J.J. When wrapped, the appearance was good and no voids were observed. On the other hand, in the case of the comparative example, the adhesive layer of the pressure-sensitive adhesive sheet adhered to the edge of the adhesive tape during unwinding, leading to damage to the adhesive sheet, and furthermore, the appearance of the pressure-sensitive adhesive sheet was poor if it were to get around the glass tube. It was bad.

As is clear from the above Examples and Comparative Examples, the method for treating the side surface of an adhesive tape-wound laminate of the present invention reliably prevents blocking when a plurality of adhesive tape-wound laminates are packaged together. Moreover, it can be seen that the above-mentioned wound laminate can be unwound and pasted without reducing the workability during packaging, and without causing problems such as poor appearance when used.

[Brief explanation of the drawing]

1, 2, and 3 are diagrams for explaining an example of the method for treating the side surfaces of an adhesive tape-wound laminate according to the present invention. A perspective view showing the state in which the pressure-sensitive adhesive sheet is in contact with each other, FIG. 2 is a side view showing the state in which the pressure-sensitive adhesive sheet is pressed by a metal plate, and FIG. 3 shows the state after the above-mentioned suppression. FIG. 1. Adhesive tape wound laminate, IA, IA' side surface, 2.
2'・Pressure-sensitive adhesive sheet 1, Patent applicant: Nitto Electric Industries Co., Ltd. Agent: Patent attorney Kunio Nemoto 1 So] 1.J, 9. j Figure 1 No. 3 Port No. 2

Claims (2)

[Claims] (1) On the side surface of an adhesive tape wound laminate formed by winding and laminating an adhesive tape having a structure in which an adhesive layer is provided on a support, a base material and a "2" layer provided on one side of the base material are provided. A pressure-sensitive adhesive sheet consisting of an adhesive layer with a Young's modulus of 05~] OKg/cr7 that has no compatibility or chemical reactivity with the adhesive layer in the adhesive tape is attached from this adhesive layer side. A method for treating the side surface of an adhesive tape-wound laminate. (2) A method for treating the side surface of an adhesive tape-wound laminate according to claim f+j, wherein the base material of the pressure-sensitive adhesive sheet is a thermoplastic resin film.