JPH0546310B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to hand-tearable fabrics that require a high degree of hand-tearability, such as printed labels, adhesive tapes, electrical tapes, and medical tapes.

<Conventional technology> Conventionally, composite fabrics made by laminating synthetic fiber fabrics and synthetic resin films with adhesives have been used as hand-cut fabrics that require a high level of hand-cut ability, such as printed names. Attempts have been made to improve the properties of the fibers constituting the fabric or the fabric itself in order to improve its hand-tearability.

For example, an example of improving the properties of the fibers and fabrics that make up the fabric is ``In a rolled medical astate cloth adhesive tape, the warp of the acetate cloth of the tape is 30 to 70% of the thickness of the weft,
``Medical acetate cloth adhesive tape which is easy to break and is made by welding the side sections of acetate cloth of the tape'' (Utility Model Publication No. 35998/1983) is known. Examples of improved film properties include:
"A plastic film tape that has been stretched in the longitudinal direction to a natural stretch ratio or less and in the transverse direction to a natural stretch ratio or above, and has narrow grooves in the transverse direction with a depth of 10 to 40% of the tape thickness at intervals of 10 mm or less. an adhesive tape characterized in that at least one side of the tape is an adhesive layer.
(Utility Model Publication No. 55-30989) is known. Alternatively, as an example of specifying the fiber properties that make up a fabric to improve hand-cutting performance, use the "temperature at which the mechanical loss tangent (tan δ) at a measurement frequency of 110Hz reaches its maximum.
A base for adhesive tapes with excellent tearability, which is made of polyester fibers having a Tmax of 120°C or less, an elongation of 10 to 23%, a toughness of 13 to 20, and a boiling water shrinkage of 6% or less as warp threads. "Cloth" (Tokukaisho
62-28436) is known.

However, hand-tearable fabrics require both tearability and handleability (workability), and for this purpose, appropriate hardness is required, and in order to provide appropriate hardness, the thickness of the synthetic resin film is usually adjusted. It is set to be 70μm or more.

<Object of the invention> The present invention provides such a conventional shearable fabric,
There is a correlation in terms of tearing strength between the multifilament warp yarns that make up the fabric and the adhesive strength between the fabric and the film, and if appropriate adhesive strength is provided, good hair breakage will occur even if the multifilament warp yarns are strong or have high elongation. Being able to have sex,
That is, the inventors have discovered that it is possible to reduce the tearing strength of the entire tear-resistant fabric, leading to the present invention. Furthermore, by using a pretreated fabric that has been pre-impregnated with resin as the base fabric, we have found that the adhesiveness between the fabric and the film can be improved and the thickness of the film can be made thinner than before, leading to the present invention. be.

In other words, the present invention provides: (1) A composite fabric made by laminating a polyethylene film on a woven fabric via an adhesive, in which the woven fabric is made of multifilament and the strength of the multifilament warp is 300 to 400 g/multifilament, adhesive strength A hand-cuttable fabric characterized by having a weight of 1000 to 2000 g/inch.

(2) The hand-cuttable fabric according to claim 1, wherein the multifilament has an elongation of 12 to 18%.

(3) The hand-cuttable fabric according to claim 1 or 2, which is impregnated with a resin so that the woven fabric has a hardness of 5 mm or more as measured by the cantilever method (JIS-L-1096). . ”.

The fiber material used for the woven fabric of the present invention is not particularly limited, but fibers such as polyester, polyamide, and polyacrylonitrile are used. Although the adhesive is not particularly limited, epoxy resin, melamine resin, polyalkylene imine resin, etc. are used.

The strength of the multifilament system that makes up the woven fabric (base fabric) is in the range of 300 to 400 grams/multifilament. If it is less than 300 grams, it will not be strong enough to be cut by hand. If the weight exceeds 400 grams, the ease of cutting by hand will deteriorate. The elongation is preferably in the range of 12 to 18%. Adhesive strength is 1000-2000g/
In the range of inches. If the weight is less than 1000 grams, the ease of cutting by hand will deteriorate. If it exceeds 2000 grams, it becomes too hard and becomes impractical in terms of handling.

When using a pretreated fabric that has been previously impregnated with a resin as a base fabric, the pretreatment resin is not particularly limited, but it is preferable to use polyester, melamine, or acrylic resin.

The hardness of the pretreated fabric, that is, the degree of resin impregnation treatment, is determined by the cantilever method (JIS-L-1096).
It is preferable that the hardness measured by is 5 mm or more.

<Effects of the invention> The present invention has the following effects.

(1) Compared to conventional products, it is possible to obtain good hair breakability (200 to 450 grams) even when using high-strength yarn or high-elongation yarn (the strength or elongation of conventional products is 200 grams). ~250g/multifilament, elongation is 7-12%, and adhesive strength is normal
500-1000 grams/inch).

(2) Although the thickness is thin, the tape stands up well (5
cm or more, preferably 10 cm or more), ease of handling (workability)
is excellent.

(3) High peeling strength when wet.

<Examples> The present invention will be specifically explained below using examples.
In the examples, hair breakability, hardness, peeling strength, etc. were measured by the following methods.

Hair breakage (JIS-L-1096 pendulum method) Test piece is 6.3 cm long and 10 cm wide. The testing machine is an Elmendorf type tensile strength testing machine. Make a 2 cm cut with a sharp blade perpendicular to the long side at the center of both grips of the test piece, and read the load when the remaining 4.3 cm is torn.

Tape standing property (JIS-L-1096 cantilever method) Test piece is 2 cm wide and 15 cm long. The testing machine is a cantilever type testing machine.

Adhesive strength (JIS-K-6328) Test piece is 20 mm wide and 20 mm long. The testing machine is an Instron tensile testing machine. The tensile speed is 50mm/min. The peeling angle is 180°.

Example 1 Polyethylene terephthalate yarn with a fineness of 70 denier and 24 filaments was used as the warp (warp strength was 370 grams)
Using polyethylene terephthalate yarn with a fineness of 100 denier and 24 filaments as the weft, a plain weave fabric with a weft density of 50 threads/inch and a weft density of 45 threads/inch was woven without glue. Epomin P1000 as adhesive to the obtained base fabric
(Polyethyleneimine, 25 g/solution, manufactured by Nippon Shokubai Kagaku Kogyo Co., Ltd.) was applied in an amount of 0.5% by weight based on the weight of the base fabric, and while extruding molten polyethylene on the base fabric using a T-die, it was laminated and pressed into a film having a thickness of 60 μm. The resulting hand-tearable fabric had a hand-tearability of 400 grams, an adhesive strength of 1,500 grams, and a tape standability of 5 cm.

Example 2 Polyethylene terephthalate yarn with a fineness of 70 denier and 24 filaments was used as the warp (warp strength was 300 grams)
Using polyethylene terephthalate yarn with a fineness of 100 denier and 24 filaments as the weft, a plain weave fabric with a warp density of 50 threads/inch and a weft density of 45 threads/inch was woven without glue. Epomin p1000 as adhesive to limited base fabric
(Polyethyleneimine, 25g/solution, manufactured by Nippon Shokubai Kagaku Kogyo Co., Ltd.) is 0.5% by weight based on the weight of the base fabric, and Pluscoat Z-448 (70g/solution, manufactured by Gooh Kagaku Kogyo Co., Ltd.) is 1.8% by weight based on the weight of the base fabric. Adhere to 120℃
While extruding molten polyethylene using a T-die, it was laminated and pressed into a film having a thickness of 60 μm on the dried base fabric. The hand-cutting property of the obtained hand-cutting fabric was 370.
g, adhesive strength is 1200 g, tape standing ability is
It was 15cm long.

Comparative Example 1 Boncoat ES141 (acrylic resin, manufactured by Dainippon Ink Co., Ltd.) was added as an adhesive to the plain woven base fabric (thread tenacity 370 grams) obtained in Example 1 based on the weight of the base fabric.
Molten polyethylene was deposited in an amount of 0.5% by weight on the base fabric, and while extruded through a T-die, it was laminated and pressed into a film having a thickness of 60 μm. The resulting hand-tearable fabric had a hand-tearability of 700 grams, an adhesive strength of 800 grams, and a tape standability of 6 cm.

Comparative Example 2 A plain woven fabric with a warp density of 45 threads/inch and a weft density of 40 threads/inch was woven using rayon fibers with a cotton count of 30 as the warp and yarn (thread tenacity 250 g, rayon cloth/moss). 0.2% by weight of epoxy P1000 was attached as an adhesive to the obtained base fabric, and molten polyethylene was extruded onto the base fabric using a T-die to increase the thickness.
Laminated and pressed into a 60μ film. The resulting hand-tearable fabric has a hand-tearability of 150 grams and an adhesive strength of
It weighed 1500 grams and had a table height of 8 cm.

Claims (1)

[Claims] 1. A composite fabric formed by laminating a polyethylene film on a woven fabric via an adhesive, in which the woven fabric is made of multifilaments, the multifilament warp strength is 300 to 400 g/multifilament, and the adhesive strength is 300 to 400 g/multifilament. A hand-cuttable fabric characterized by a weight of 1000 to 2000 grams/inch. 2. The hand-cuttable fabric according to claim 1, wherein the multifilament has an elongation of 12 to 18%. 3. The hand-cuttable fabric according to claim 1 or 2, which is impregnated with a resin so that the woven fabric has a hardness of 5 mm or more as measured by the cantilever method (JIS-L-1096).