JPH05140838A - Woven fabric for tacky adhesive tape base - Google Patents

Abstract

PURPOSE:To obtain a base cloth for tacky adhesive tape, easily cuttable by hand to form a clear cut end and free from the lowering of strength in wet state by weaving a cloth using polyester multifilament yarn as a warp and acrylic multifilament yarn as a weft. CONSTITUTION:Woven fabric is produced by using a warp consisting of polyester multifilament yarn and a weft consisting of acrylic multifilament yarn having a single fiber denier of 1-5de and a total denier of 20-150de and composed of a copolymer containing >=70wt.% of acrylonitrile. A polyethylene film is laminated on one surface of the woven fabric and a rubber-based adhesive is applied to the other surface to obtain a tacky adhesive tape.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a base cloth for adhesive tapes, and more particularly to a base cloth for adhesive tapes which has good hand-cutting property and has a beautiful cut end and a beautiful product surface. Is.

[0002]

2. Description of the Related Art In recent years, adhesive tapes have been widely used as packaging materials and masking materials. The required characteristics are good hand-cutability, beautiful cuts, and a decrease in strength due to changes in temperature and humidity. It has few dimensional changes, is beautiful as a product, and can be supplied at low cost.

In order to meet the above-mentioned required characteristics, spun yarn or vinylon fiber made of rayon fiber has hitherto been used, but the rayon spun yarn has a large decrease in strength when wet and tends to cause uneven thickness on the base fabric. Furthermore, there are drawbacks such that the polyester film of the backup material shrinks due to water absorption of the fiber, the adhesive layer peels off, and the spun yarn tends to cause excessive adhesion of the adhesive. It has drawbacks such as a decrease in strength and shrinkage due to water absorption of the fiber, resulting in separation of the backup material and the adhesive layer.

For the purpose of improving these drawbacks, various base fabrics using polyester filaments or acrylic spun yarn have been proposed. For example, hand-cutting, which is a drawback of base fabric using ordinary polyester filaments,
In order to improve the beauty of the cut end, the adhesiveness with a polyethylene film as a backup material, and the curl property generated in an adhesive tape as a product, Japanese Patent Publication No. 62-141148 discloses a warp with a sulfonic acid group of 3.0. A modified polyester filament containing more than mol% is entangled, and the breaking strength after the entanglement is 2.45 g / d or less and the breaking elongation is 30.
% Or more, and the maximum heat shrinkage force per denier is 0.2
A woven fabric has been proposed in which fibers of g / d or less are used and ordinary polyester filaments having a single yarn fineness of 1 to 6 denier and a total fineness of 70 denier or more are used as wefts. However, this woven fabric has some problems in manufacturing, such as using modified polyester, requiring entanglement treatment, and controlling the shrinkage ratio. Furthermore, the adhesiveness with the polyethylene film that is the backup material is still insufficient. is not. On the other hand, Japanese Utility Model Laid-Open No. 102450/1990 proposes to use acrylic spun yarn for warp and / or weft. Certainly, although the decrease in tensile strength when wet is very small for acrylic spun yarn, since it is a spun yarn, it is a backup material and the amount of adhesive used to provide adhesion to polyethylene is large and the amount of adhesive is too large. become,
The adhesive is exposed at the cut end, or the spun yarn is exposed, so the beauty of the cut end is not yet sufficient, and there is a problem in terms of the beauty of the surface of the product, especially in the thickness unevenness of thin adhesive tape. there were.

[0005]

SUMMARY OF THE INVENTION The object of the present invention is to maintain the hand-cutting property and the beautifulness of the cut end, to have good adhesiveness to a polyethylene film which is a backup material, and to be free from unevenness in thickness and curl. Another object of the present invention is to provide a base cloth fabric for a good pressure sensitive adhesive tape.

[0006]

DISCLOSURE OF THE INVENTION The present invention provides a base fabric for an adhesive tape comprising a warp and a weft, wherein the warp comprises a polyester multifilament and the weft comprises an acrylic multifilament. It is a base fabric. The polyester multifilament used for the warp in the present invention has a strength of 15 kg / 25 mm or more generally required when it is used as a base fabric for an adhesive tape, and it can be cut by hand (tear strength of 400 g or less in the vertical direction as an adhesive tape). ) Is sufficient. Further, this multifilament may be a normal polyester resin or one produced from a modified polyester resin.

One feature of the present invention is the use of acrylic multifilaments in the weft. The method of using acrylic multifilament for the warp is Japanese Patent Application No. 3-825.
Although it has already been filed as Japanese Patent Publication No. 83, it focuses on the characteristics of acrylic multifilaments, that is, that the elongation is moderately low and that the hand-cutting property and the cut end are beautiful. As a result of further research, the present inventor has surprisingly found that when the polyester multifilament is used as the warp and the acrylic multifilament is used as the weft, both the cut end of the polyester multifilament of the warp and the cut end of the multifilament of the weft are both beautiful, It has been found that a woven fabric having good hand-cutting properties, no unevenness in thickness and curl of the product, and good adhesiveness to a polyethylene film as a backup material can be obtained.

Further, when polyester filaments are generally used as the warp of the base fabric for adhesive tape, the elongation of the filament is preferably in the range of 10 to 15%, while the acrylic multifilament of the present invention is used as the warp. It has been found that, by using the polyester multifilament, which is usually produced, the one having an elongation of 20 to 40% is easily hand-cut and its cut end is beautiful. The reason for this is not clear, but it is presumed that the frictional adhesion between the acrylic multifilament and the polyester multifilament is involved.

The acrylic multifilament used in the present invention is obtained by spinning a conventionally used polyacrylonitrile, a copolymer containing 70% by weight or more of acrylonitrile, or a mixture of two or more thereof by a conventional method. The single yarn denier is preferably 1 to 5 denier, and the total denier is preferably 20 to 150 denier. The strength of the multifilament is the same as that of the warp direction, that is, the strength generally required for an adhesive tape is not less than 15 kg / 25 mm width and it can be cut by hand (the tear strength in the horizontal direction as an adhesive tape is 400 g or less). I wish I had it. This is easily done by properly selecting the denier and weave density of the multifilament. further,
It is preferable that the acrylic multifilament of the present invention is not substantially crimped.

Hereinafter, the present invention will be specifically described with reference to examples, but the present invention is not limited to these examples. The tear strength in the examples was evaluated according to the following. Evaluation of tear strength: Tear strength is the strength when tearing the adhesive tape by cutting the warp of the base fabric for adhesive tape, JI
SL-1079 It carried out based on the C method (Bendulum method).

From the experience of the present inventors, an adhesive tape having good hand tearability was judged to have good hand tearability if it was 400 g or less by this test method. Example 1 A polyester having a total fineness of 50 denier and 34 filaments (strength: 5.0 g / d, elongation: 32%) was used as a warp, and an acrylic filament having a total fineness of 75 denier and 38 filaments (strength: 3.5 g / d). , Elongation 12
%) Is used for the weft, and the weaving density is 65 warps / inch,
Weaving was performed with a raw machine using a water jet loom (commonly called water jet loom) with a weft direction of 45 yarns / inch.

Using the obtained greige fabric as a base fabric, an adhesive was coated on the base fabric, and a polyethylene film having a thickness of 50 μm was melt-extruded and laminated on the surface for lamination. Then, a rubber adhesive was applied to the cloth surface to prepare an adhesive tape. The obtained pressure-sensitive adhesive tape could be cut into pieces by hand very easily, and there were no frayed threads or uneven thickness, and the cut end was also clean. The tensile strength of this tape is 1
The tear strength at 8 kg / 25 m was 95 g. Example 2 Ordinary polyester filament having a total fineness of 75 denier and 48 filaments (strength 5.5 g / d, elongation 28%)
Is used for the warp, the total fineness is 100 denier, and the acrylic filament (strength 3.7 g /
d, elongation 10.5%) for weft, weaving density, warp direction
40 lines / inch, weft direction 40 lines / inch, Example 1
A base fabric for an adhesive tape and an adhesive tape were prepared in the same manner as in.

The adhesive tape obtained was evaluated for hand tearability, and it was found that it could be cut into pieces by hand very easily, there was no frayed yarn, uneven thickness, and the cut end was very clean.
The tensile strength of this tape is 20kg / 25m, and the tear strength is
It was 105 g. Comparative Example 1 A normal polyester filament having a total fineness of 50 denier and 34 filaments (strength 5.0 g / d, elongation 32%).
Is used for the warp, the total fineness is 75 denier, the usual polyester filament of 34 filaments (strength 5.5g /
d, elongation 30%) is used for the weft, and the weaving density is 65
Example 1 with a line / inch and a weft direction of 45 lines / inch
A base cloth for an adhesive tape and an adhesive tape were prepared in the same manner as in (1).

As a result of evaluating the hand tearability of this pressure-sensitive adhesive tape, it was found that it was not cut by hand and the tensile strength was 19 kg / 25 mm and the tear strength was 950 g.

[0015]

EFFECTS OF THE INVENTION According to the present invention, by using a base fabric fabric using polyester multifilament yarn as the warp and acrylic multifilament yarn as the weft, the adhesive tape has good hand-cutability and cut end It is possible to obtain a good pressure-sensitive adhesive tape that retains its beauty, does not lose its strength when wet, has no unevenness in the thickness of the product, has a smooth surface, and has no curl. In addition, by using the polyester multifilament for the warp, it is possible to obtain an inexpensive adhesive tape base cloth with good productivity.

Claims (1)

[Claims] 1. A base fabric for an adhesive tape, comprising a warp and a weft, wherein the warp comprises a polyester multifilament and the weft comprises an acrylic multifilament.