JPH07194744A - Gut - Google Patents

Abstract

PURPOSE:To improve the impact resistance of guts to be used for rackets of tennis and badminton by imparting flexibility to this gut while maintaining the low elongation and high strength of the gut. CONSTITUTION:Several pieces of monmofilaments of nylon 6 are wound as side yarn 2 around core yarn 1 consisting of multifilaments 1a of aramid fibers. The yarn are then fixed by an adhesive. Several pieces of monofilaments 3c of nylon 6 and several pieces of stretch-broken textile yarn 3b of aramid fibers are wound as side yarn 3 on the outer periphery of the core yarn 1 and the side yarn 2 and are fixed by the adhesive. A synthetic resin coating layer 5 is formed on the outermost layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to guts used in rackets for tennis, badminton, squash, etc.
It relates to a gut having excellent impact resistance.

[0002]

2. Description of the Related Art As a gut for rackets such as tennis and badminton, animal fibers such as cattle and sheep intestines and whale muscle have been used for a long time. Although it has excellent resilience, it has a problem that it is inferior in water resistance and therefore has a short service life and is extremely expensive.

In place of the above-mentioned animal fibers, many synthetic fiber gut in which synthetic fibers such as nylon and polyester are braided using a core yarn and a side wound yarn are used. There is a demand for a gut with a small diameter and high strength, but it is extremely difficult to satisfy both of these, and the gut using the above nylon or polyester fiber also has excellent water resistance and high strength. Despite having it, the elongation is 27-3
Since it is 3%, there is no problem in stretching a normal size racket, but when it is pulled up strongly like a large size racket and pulled up, it has flexibility, resilience,
There is a problem that it lacks impact resistance.

[0004]

In recent years, high strength,
With the advent of aramid fibers having excellent high abrasion resistance, the fibers are coated and braided on the outer periphery of a core yarn made of nylon, polyester or metal fine wire as a core winding yarn or a side winding yarn (Japanese Patent Laid-Open No. 61-193679), Alternatively, a gut in which this aramid fiber is used as a core yarn together with nylon fiber and the like has been proposed (JP-A-3-205070), but it has strength at low elongation but lacks flexibility, resulting in resilience and impact resistance. Problems such as sex have been pointed out.

The present invention has been made to solve the above problems, and has a small diameter, excellent water resistance and abrasion resistance, and high strength at low elongation. The purpose of the present invention is to provide a gut having excellent flexibility, impact resilience, and impact resistance at low cost.

[0006]

That is, the gut of the present invention is a multi-filament of aramid fiber, a spun-off spun yarn of aramid fiber (direct spun yarn), a synthetic fiber yarn alone or a bundle thereof as a core yarn, At least one of aramid fiber multifilament, aramid fiber spun yarn (spun yarn), and synthetic fiber yarn is wound around the outer periphery of the core yarn as a side yarn, and a synthetic resin coating layer is formed on the peripheral surface of the side yarn. It is a thing.

[0007]

The gut according to the present invention has low elongation and high strength by using the check-cut spun yarn of aramid fiber as a main constituent fiber in at least one of the core yarn and the side yarn as described above, and It is possible to obtain a gut that is flexible and has excellent impact resistance at a low cost.

As described above, the aramid fiber has low elongation and high strength as compared with the nylon fiber and the polyester fiber. However, since the aramid fiber has difficulty in flexibility and inferior impact resistance, the aramid is used in the present invention. The stretch-spun spun yarn of fibers is used in combination, and the spun-spun spun yarn of aramid fibers is, for example, 1000 denier / 1 of the above-mentioned aramid fibers (long fibers).
It is obtained by continuously cutting a 334 filament into 45 cm or 150 cm while stretching it between two rollers, and then bundling this and twisting it at a twist number of 400 to 550 T / m. When the tensile strength of the yarn was measured, as shown by the stress-strain curve in FIG. 5, it showed a value of 28 g / de at a breaking elongation of 10% and 9.4 g / de at a breaking elongation of 19% of nylon 6 fiber. Tensile strength of de, breaking elongation of polyester fiber 13% at 9.2 g / d
Compared with the tensile strength of e, it has a low elongation and shows about three times the strength. Compared with the aramid fiber, this shows about twice the elongation at the same tensile strength, which means that the stretch-cut spun yarn has added flexibility, while maintaining high strength. The impact resistance is improved.

In the present invention, by using the stretch-cut spun yarn having the above characteristics as a constituent material of the gut,
The obtained gut is given flexibility and has high impact resistance, and as a result, durability can be improved. In the present invention, for example, Technora GTN manufactured by Teijin Ltd. is used as such a stretch-cut spun yarn.

Synthetic fiber yarns to be used with these aramid fibers or their stretch-spun yarns include nylon 6, nylon 66 or their copolymers, polyesters,
Polyolefin and the like are suitable.

The gut according to the present invention comprises aramid fiber, its stretch-spun spun yarn, and synthetic fiber yarn, either alone or in combination.
First, a core yarn is formed, and side yarns are sequentially braided on the core yarn. Nylon-based adhesives are used as adhesives to form the core yarns and the side yarns. Is fixed by adhesive, and the threads to be laminated are also fixed by adhesive. In the present invention, since the aramid fiber's checkered spun yarn has fluffs, it is possible to more effectively perform the bonding with an adhesive and overcome the problem that the aramid fiber has poor adhesion to other fibers. What can be done is also one of the features. As the nylon adhesive, for example, a nylon resin dissolved in a solvent such as phenol or formic acid and, if necessary, diluted with a solvent such as trichloroethylene, perchlorethylene or ethane dichloride is suitable.

When the side yarn is formed on the outer periphery of the core yarn by using the above-mentioned material, and the outermost layer is coated with a resin such as nylon resin or urethane resin, and a coating layer is provided, it is possible to stretch the gut or hit the ball. It is possible to prevent fatigue of the fibers and further improve durability, abrasion resistance and the like.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. Example 1 FIG. 1 is a cross-sectional view of a gut showing an example of the present invention, in which 1 is 2000 aramid fibers (made by Teijin Ltd., Technora T-240) having a single fiber thickness of 1.5 denier. A core yarn composed of a bundle of 3000 denier multifilaments 1a, and 200 as side yarns 2 around the core yarn 1.
Four denier nylon 6 monofilaments 2c were wound around and fixed to each other with a nylon adhesive 4. Next, ten monofilaments 3c of 210 denier nylon 6 and 0.7 on the outer periphery of the side yarn 2 and the core yarn 1 described above.
Draft-cut 5 denier aramid fiber (Technola T-240) to a length of 45 cm, bundle it and 400 T /
5 177 denier checkered spun yarns 3b (Technola GTN manufactured by Teijin Ltd.) obtained by twisting with a twist number of m
Was braided and fixed with a nylon adhesive. After that, a nylon resin coating layer 5 was formed on the outermost layer to obtain a gut having a diameter of 1.07 mm.

Example 2 200 denier aramid fiber multifilament 1a
20 obtained by bundling aramid fibers cut to a cut length of 150 cm with 1 denier and twisting them 500 T / m times
A core yarn 1 was prepared by using a 0 denier spun yarn 1b, and 200 side denier multifilaments 2a of 200 denier as side yarns 2 and 4 200 denier stretch spun yarns 2b same as 1b above. Winding one by one, core yarn 1 and side yarn 2
They were fixed to each other with an adhesive. Next, on the outer circumference thereof, nine 210-denier nylon filament monofilaments 3d made of a copolymer of nylon 6 and nylon 66, and six of the same 200-denier checkered spun yarns 3b were used as side yarns 3. After braiding and fixing with an adhesive 4, a coating layer 5 of nylon resin was formed on the outermost layer to obtain a gut having a diameter of 1.1 mm and having the structure shown in FIG.

Example 3 The 177 denier checkered spun yarn used as one of the side yarns in Example 1 was bundled into a core yarn 1b, on which 210 denier nylon monofilaments 2c of 8 side yarns were formed. No. 2 and fixed with an adhesive 4 and then 200 denier aramid fiber multifilaments 3a, 17
After wrapping 5 side-to-side spun yarns 3b of 7 denier and 5 monofilaments 3c of nylon fiber of 210 denier as side yarns 3, a nylon resin coating layer 5 is formed on the outer layer to have a diameter of 1 as shown in FIG. A gut of 0.2 mm was obtained.

Example 4 200 denier aramid fiber multifilament 1
177, obtained by cutting a 1.5 denier aramid fiber into a length of 45 cm, bundling them, and twisting them 400 times
A core yarn 1 is composed of bundles of denier spun yarn 1b and 210 denier nylon fiber monofilament 1c, and 200 denier aramid fiber multifilament 2a and 210 denier nylon fiber are formed on the core yarn 1. Each of the monofilaments 2c of No. 2 was wound to form a side thread 2, and these were fixed with an adhesive 4. Then 2 on it
The 10-denier nylon monofilament 3c and the 177-denier checkered spun yarn 3b are used to form the side yarn 3, and the nylon resin coating layer 5 is formed on the outer layer to form the diameter shown in FIG. A gut of 1.15 mm was obtained.

Physical properties such as tensile strength and elongation were examined for the gut obtained in the above example and the conventional nylon gut in which all of the natural sheep gut, core yarn, core wound yarn, and side wound yarn are made of nylon monofilament. The results shown in Table 1 were obtained, and it was confirmed that the gut of the present invention was very excellent. Further, when the gut obtained in the above example was stretched and used on a tennis racket, it was flexible and improved in impact resistance and excellent in durability although it had a small elongation.

[0018]

[Table 1]

[0019]

As described above, the gut according to the present invention uses the draft-spun spun yarn of aramid fiber as one of the materials for the core yarn and the side yarns, so that it has high elongation and high strength. It was confirmed that the gut which can impart flexibility, has excellent impact resistance, and has a long service life.

[Brief description of drawings]

FIG. 1 is a sectional view showing an embodiment of a gut according to the present invention.

FIG. 2 is a sectional view showing another embodiment of the gut according to the present invention.

FIG. 3 is a sectional view showing another embodiment of the gut according to the present invention.

FIG. 4 is a sectional view showing another embodiment of the gut according to the present invention.

FIG. 5 is a diagram showing the relationship between breaking elongation and tensile strength of fibers.

[Explanation of symbols]

 1 core yarn 2 side yarn 3 side yarn 4 adhesive layer 5 resin coating layer

Claims (8)

[Claims] 1. A core yarn made of aramid fiber multifilament is wound around the outer periphery of at least one of aramid fiber multifilament, aramid fiber spun-off spun yarn and synthetic fiber yarn as a side yarn, and the outer periphery is coated with a synthetic resin. Gut formed by forming layers. 2. The synthetic fiber yarn is nylon, polyester,
The gut according to claim 1, which is made of polyolefin. 3. At least one of an aramid fiber multifilament, an aramid fiber stretch-cut spun yarn, and a synthetic fiber yarn is wound as a side yarn on the outer periphery of a core yarn made of the aramid fiber stretch-spun yarn, and is wound around the outer periphery. A gut formed by forming a synthetic resin coating layer. 4. The synthetic fiber yarn is nylon, polyester,
The gut according to claim 3, which is made of polyolefin. 5. At least one of an aramid fiber multifilament, an aramid fiber stretch-cut spun yarn, and a synthetic fiber yarn on the outer periphery of a core yarn composed of a bundle of aramid fiber multifilaments and aramid fiber stretch-cut spun yarn. A gut which is formed by winding as a side thread and forming a synthetic resin coating layer on the outer circumference. 6. The synthetic fiber yarn is nylon, polyester,
The gut according to claim 5, which is made of polyolefin. 7. An aramid fiber multifilament, an aramid fiber stretch-cut spun yarn, and a synthetic fiber yarn on the outer periphery of a core yarn composed of a bundle of the aramid fiber multifilament and the aramid fiber stretch-spun yarn and a synthetic fiber yarn bundle. A gut formed by winding at least one kind as a side thread and forming a synthetic resin coating layer on the outer circumference. 8. The synthetic fiber yarn is nylon, polyester,
The gut according to claim 7, which is made of polyolefin.