JPS6153380A - Production of air-permeating adhesive tape - Google Patents

Abstract

PURPOSE:Needles with quadrangular pyramid edge are pressed from the side of the thermoplastic layer of a tackifying tape under specific conditions to enable high-efficiency production of the title tape which has high air permeation, is readily cut in the widthwise direction with hands, leaving no adhesive on the needles with uniform perforation. CONSTITUTION:Perforating needles with a quadrangular cone or point-rounded quadrangular cone are pressed to a tackifying tape which is made by laminating an adhesive on one surface of the thermoplastic resin layer from the side of the resin layer so that the diagonal lines at the bottom of the needles become parallel with the lengthwise and widthwise directions of the adhesive tape to give the objective tape with a number of perforation. The quadrangular cone has a side- face angle of 35-75 deg. and the diagonal length at the bottom face of 1.0-2.0mm..

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for producing an adhesive tape that has excellent air permeability and is easily cut by hand in the middle direction.

[Conventional technology]

Conventionally, when adhesive tapes made of a thermoplastic resin film laminated with an adhesive layer are used for medical purposes, they are not breathable and can cause dermatitis, so small holes have been made in the adhesive tapes to make them breathable. In some cases, small circular holes are arranged in the adhesive tape so that it can be cut by hand.

[Patent Office Gazette, Collection of Well-known and Commonly Used Techniques (Adhesion), 313 Adhesive tape with small holes, p. 189] [Problems to be solved by the invention] However, when the adhesive tape is made with circular small holes lined up, the adhesive tape becomes weak when pulled. is growing.

There were drawbacks such as the lack of directionality when cutting, resulting in diagonal cuts.

Misfire+yti In view of the above-mentioned drawbacks, it is an object of the present invention to provide a method for producing a breathable adhesive tape that can be easily cut by hand in the width direction of the adhesive tape.

[Means for solving problems]

The piercing needle used in the present invention is a regular square pyramid or a square pyramid with a rounded tip. A regular square pyramid is a male body with a regular square base, and the angle of the side surface is preferably 35 to 75 degrees, and the diagonal of the base is 115 to 3.5 degrees. It is preferable to set it to Off, and more preferably #itO to λOM''t'. Also, it is preferable that the tip of a regular square pyramid with a rounded tip is rounded and flatly rounded, and the bottom of the rounded part It is preferable that the diagonal line of t is less than or equal to the diagonal line A of the base of the square pyramid.

It is preferable that the perforation needles are provided with roll metal 11/c so that the diagonal lines on the bottom are parallel to the width direction and the circumferential direction of the roll, respectively, and the distance between the tips of the perforation holes is less than Fi8. is preferable.

The adhesive tape used in the present invention has an adhesive layer laminated on one side of a thermoplastic resin layer.

The thermoplastic resin layer preferably has an appropriate elongation at break of 30% or more, and is made of, for example, polyethylene, polyvinyl chloride, ethylene-vinyl acetate copolymer, or the like.

Further, as the above-mentioned adhesive, any conventionally known adhesive can be used, such as acrylic, rubber, vinyl ether, etc.
Silicone-based, urethane-based, etc. are destroyed.

In the present invention, the adhesive tape is perforated from the thermoplastic resin layer side of the adhesive tape so that the diagonals of the bottom surface of the perforation needles are parallel to the length direction and the width direction of the adhesive tape, respectively. A large number of perforations are formed in the adhesive tape by pressing the needle, and it is preferable to press the adhesive tape with a pressure roll or a tensile force to form the perforations on a roll provided with the perforation needle as described above. At this time, if the adhesive tape is easily stretched, a release paper with low extensibility may be layered on the adhesive layer to suppress extensibility and heated to 60-1406.

〔Effect of the invention〕

The structure of the method for producing a breathable adhesive tape of the present invention is as described above, and the perforations are made in the adhesive tape by pressing the perforation needle not from the adhesive side of the adhesive tape but from the thermoplastic resin layer side.

The perforated needle 9 adhesive is difficult to break, and therefore an adhesive tape having uniformly shaped perforations can be obtained efficiently. In addition, the obtained adhesive tape has a large number of approximately quadrangular pyramid-shaped perforations arranged so that the diagonal lines on the bottom are parallel to the width and length directions of the adhesive tape, so it does not cut diagonally. , 4y with good manual tearability in the width and length directions of the adhesive tape
'J can do it. In addition, the perforations are approximately square pyramid-shaped, and the bottom surface is located on the thermoplastic resin side, so it has excellent breathability, and when attached to the human skin, it has excellent volatilization of moisture such as sweat. ing.

Therefore, the breathable adhesive tape of the present invention can be suitably used for medical purposes.

〔Example〕

Next, the present invention will be explained in detail.

Example A toluene solution of an acrylic adhesive was applied to silicone-treated release paper and dried to form an acrylic adhesive layer with a thickness of 40 μm. A pressure-sensitive adhesive tape laminate was obtained by laminating the adhesive tapes (thickness: 120 μm). The obtained laminate was supplied to a roll having a large number of perforated needles so that the polyethylene film was in contact with the perforated needles, and was pressed with a rubber roll to obtain an adhesive tape provided with a large number of perforations.

The perforation needle has a side angle of 62 degrees and a bottom diagonal of 15 gm.
It is a regular square pyramid with diagonal lines parallel to the width direction and circumferential direction of the roll, and the bottom corners of each punching needle are set so as to touch the bottom corners of the other punching needles adjacent to each other. The tip of the piercing needle was not heated to 110"C during piercing.

The obtained adhesive tape has a large number of substantially square pyramidal perforations, and can be easily cut by hand in the width direction and length direction of the adhesive tape, and cannot be cut diagonally.

Also, BS! ! Using a Den-meter, JIS-
When air permeability was measured in accordance with 4-8117, it was 1 second/300 m air.

Claims (1)

[Scope of Claims] 1. An adhesive tape having an adhesive layer laminated on one side of the thermoplastic resin layer is attached to a regular square pyramid or square pyramid punching needle with a rounded tip, on the thermoplastic resin layer side of the tape. 1. A method for producing a breathable adhesive tape, the method comprising forming a large number of perforations by pressing the perforation needle so that the diagonal lines of the bottom surface thereof are parallel to the length and width directions of the adhesive tape. 2. The method for producing a breathable adhesive tape according to claim 1, wherein the angle of the side surface of the square pyramid is 35 to 75 degrees, and the length of the diagonal line of the bottom surface is 0.5 to 3.0 mm.