JPH07185046A - Gut - Google Patents

Abstract

PURPOSE:To improve the durability accompanying impact of a gut used in a racket for tennis and badminton. CONSTITUTION:As a core thread 1 constituting a gut, an aromatic polyamide fiber multifilament is used, a core winding thread 2 consisting of nylon 6 monofilament 2a and carbon fiber multifilament 2b is wound on the outer circumference of the core thread 1, a side winding thread 3 consisting of nylon 6 monofilament 3a and carbon fiber multifilament 3b is braided thereon, and a resin coat layer 4 is formed on the outer layer.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gut used for rackets such as tennis, badminton and squash.

[0002]

2. Description of the Related Art Conventionally, as a racket gut, a gut made of twisted animal fiber has long been used. The racket stretched with this gut has excellent resilience, emits a pleasant hitting sound with little slack, and gives the player a pleasant feel at impact, but has the disadvantage of poor moisture resistance and a short service life. It was

In recent years, many guts using synthetic fibers such as polyamide and polyester have been proposed. For example, on the outer peripheral surface of a core thread made of a monofilament of polyamide fiber, a core winding thread made of a large number of monofilaments having a diameter smaller than that of the core thread is adhered with an adhesive to form a winding layer. An outer peripheral surface of the winding layer is coated with polyamide resin, thermoplastic urethane elastomer, or the like, or a large number of monofilaments having a diameter smaller than that of the core thread provided so as to surround the core thread on the outer peripheral surface of the core thread. Some of them have a side winding yarn of monofilament between the core winding yarn and a coating layer formed on the upper surface thereof, that is, at a position outside the core winding yarn.

However, in the case of using the racket having the gut stretched as described above, the gut can be stretched to some extent by the striking force to absorb some impact of the ball, but the gut is given a predetermined tension. Since it is necessary to stretch over,
There is a certain limit to absorbing shock. Further, in the conventional gut, the core winding yarns of the same layer of the winding layer are wound around the outer periphery of the core yarns in close contact with each other, and this relatively large number of core winding yarns hardly distorts. Therefore, since the gut itself is not easily deformed, the impact of the ball can hardly be absorbed.

Further, in the conventional gut, since the monofilament or multifilament of polyamide fiber is used as the core winding yarn and the side winding yarn, there is a problem that it lacks flexibility and abrasion resistance although it has high strength. there were.

Recently, in order to solve the above problems, an aromatic polyamide fiber having good tensile strength and abrasion resistance is coated and braided on the outer periphery of a core yarn made of nylon, polyester or metal fine wire. Alternatively, a gut in which this aromatic polyamide fiber is twisted with nylon fiber or the like has been proposed.

[0007]

However, the gut having such a structure has a problem that it is inferior in durability against impact even though it is excellent in tensile strength and abrasion resistance. In particular, a thin metal wire as a core yarn and a braided aromatic polyamide fiber on the outer periphery of the core yarn are damaged due to lack of adhesiveness between the two and have a problem in durability.

The present invention has been made in order to solve the above problems, and is to obtain a gut having high strength, abrasion resistance and excellent durability against impact. It is an object of the present invention to provide a gut that can reduce the impact between the gut and the ball and improve the durability when a racket in which the gut is stretched is used.

[0009]

In order to achieve the above object, the gut of the present invention has a multifilament of aromatic polyamide fiber as a core yarn or a monofilament of this multifilament and nylon fiber, polyolefin fiber or carbon fiber. Alternatively, a multifilament, or a carbon fiber multifilament, or this multifilament and nylon fiber or polyolefin fiber monofilament or multifilament is used. A core winding yarn is wound around the outer periphery of this core yarn, and a side winding yarn is further applied on it. A resin coating layer is formed on the outermost layer.

[0010]

The gut of the present invention uses the multifilament of the aromatic polyamide fiber or the carbon fiber as the main constituent fiber of the core yarn as described above, so that the adhesion to the core winding yarn or the side winding yarn thereon is improved. It is possible to obtain a gut that has a small elongation, high strength, and excellent durability upon impact.

In the present invention, a multifilament of aromatic polyamide fiber or carbon fiber is used as the core yarn. These are other synthetic fibers, namely nylon 6,
It may be used together with nylon fiber such as nylon 66 or a copolymer thereof, aromatic polyamide fiber, carbon fiber, polyolefin fiber and the like. Further, as the core winding yarn and the side winding yarn, aromatic polyamide fibers, nylon fibers, carbon fibers, polyolefin fibers, polyester fibers and the like are preferable, and these are used as individual monofilaments or multifilaments, or as a bundle thereof. May be. These core yarn, core wound yarn, and side wound yarn are assembled, fixed to each other with a nylon adhesive, and a covering layer is formed on the resin by using urethane resin, silicone resin, fluororesin solution, etc. It is possible to prevent fatigue of the fiber at the time of hitting and hitting the ball, and to obtain a gut with improved wear resistance and durability.

[0012]

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 a core yarn made of a multifilament 1d of 3000 denier aromatic polyamide fiber.
A core winding yarn 2 is wound around the outer periphery of the. In this embodiment, as the core winding yarn 2, three 210-denier nylon 6 monofilaments 2a and nine 200-denier carbon fiber multifilaments 2b were used. Then, the core thread 1 and the core winding thread 2 were fixed to each other with a nylon adhesive. Then, four 210 denier nylon 6 monofilaments 3a and 12 200 denier carbon fiber multifilaments 3b are wound around the outer periphery of the core winding 2 as side windings 3 and fixed with a nylon adhesive to form a braid. I got A. Then, a gut having the structure shown in FIG. 1 was obtained by forming a nylon resin coating layer 4 on the outer layer of the braided yarn A.

Example 2 A multifilament 1d of aromatic polyamide fiber of 3000 denier similar to that of Example 1 is used as a core yarn 1, and three nylon 6 monofilaments 2a of 210 denier and three carbons of 300 denier are provided on the outer periphery thereof. A core winding yarn 2 composed of a fiber multifilament 2b and six aromatic polyamide fiber multifilaments 2d of 200 denier was arranged and fixed with a nylon adhesive. Furthermore, four nylon 6 monofilaments 3a of 210 denier and 12 aromatic polyamide fiber multifilaments 3d of 200 denier were wound as the side wound yarn 3 and fixed to each other with a nylon adhesive to form a braid B. Then, a nylon resin coating layer 4 was formed on the outermost layer to obtain a gut having the structure shown in FIG.

Example 3 Two 200 denier aromatic polyamide fiber multifilaments 1d and two 200 denier polyethylene fiber monofilaments 1c were assembled to form a core yarn 1, and 210 denier three filaments were formed on the outer periphery thereof. A core winding yarn 2 composed of nylon 6 monofilament 2a and 200 carbon fiber multifilament 2b having a denier of 2 was arranged and fixed by resin. Further, four 210 denier nylon 6 monofilaments 3a and 200 denier 12 carbon fiber multifilaments 3b were arranged as the side wound yarns 3 and resin fixing was performed to obtain a braid C. Then, a nylon resin coating layer 4 was formed on the outer layer of the braided yarn C, and a silicone resin coating layer 5 was further provided on the outermost layer to obtain a gut having the structure shown in FIG.

Example 4 A multifilament 1d of 200 denier aromatic polyamide fiber and a nylon 6 monofilament 1a of 210 denier were wound to form a core yarn 1, and 210 was formed on the outer periphery thereof.
Denier 3 nylon 6 monofilaments 2a, 2
6 carbon fiber multifilaments 2b of 00 denier
And core wound yarn 2 composed of three polyethylene fiber monofilaments 2c of 215 denier were arranged, and they were fixed to each other with an adhesive. 21 as the side winding yarn 3
Four nylon 6 monofilaments 3a of 0 denier and 12 carbon fiber multifilaments 3b of 200 denier were assembled and fixed with an adhesive to obtain a braid D. Then, a nylon resin coating layer 4 was formed on the outermost layer to obtain a gut having a structure as shown in FIG.

Example 5 The core filament 1 is the same multifilament 1d of 3000 denier aromatic polyamide fibers as in Example 1, and 210 denier nylon 6 monofilaments 2a and 20 are used.
Three carbon fiber multifilaments 2b of 0 denier and three polyethylene fiber monofilaments 2c of 215 denier were used as core winding yarns 2, and 10 nylon nylon 6 monofilaments 3a of 210 denier and 200 denier were used as side winding yarns 3 thereon. Using 10 carbon fiber multifilaments 3b of No. 3, the braided yarn E was obtained in the same manner as in Example 1.
Next, a coating layer 4 was formed on the outermost layer using nylon resin to obtain a gut having the structure shown in FIG.

Example 6 200 denier carbon fiber multifilaments 1b and 2
00 denier polyethylene fiber monofilament 1c
Are bundled to form a core yarn 1, and six 210 denier nylon 6 monofilaments 2a and 215 are provided on the outer periphery of the core yarn 1.
Denier polyethylene fiber monofilament 2c 6
The book is wound as a core winding thread 2, these are fixed with a nylon adhesive, and 210 denier nylon 6 is further placed thereon.
The side winding yarn 3 composed of six monofilaments 3a, six 215 denier polyethylene fiber monofilaments 3c, and four 200 denier polyester fiber monofilaments 3e was assembled and fixed with an adhesive to obtain a braid F. It was Next, this braided yarn F was impregnated with a nylon resin and heated between the monofilaments to harden the resin, and then a nylon coating layer 4 was formed as the outermost layer to obtain a gut having the structure shown in FIG.

Example 7 2000 denier carbon fiber multifilament 1b was used as the core yarn 1, and three nylon 6 monofilaments 2a of 200 denier and 9 of 200 denier were used on the outer periphery thereof.
Four aromatic polyamide fiber multifilaments 2d are wound around to assemble the core winding yarn 2, and the side winding yarn 3 is further provided with four nylon 6 monofilaments 3a of 210 denier and 12 aromatics of 200 denier. The polyamide fiber multifilament 3d is wound to obtain the braided yarn G, and then the molten nylon resin is impregnated and heated to fix them to each other, and then the covering layer 4 is formed on the outermost layer to obtain the gut having the structure shown in FIG. Obtained.

In the above examples, the monofilament was used for all the fibers other than the aromatic polyamide fiber and the carbon fiber in the structure of the core yarn, core wound yarn and side wound yarn.
It may be a multifilament and is not limited to the above-mentioned embodiments.

When the gut of the present invention obtained in the above example was stretched and used on a tennis racket, it had excellent repulsion property, relaxation resistance and fatigue resistance, and produced a pleasant hitting sound. Even after repeated use, it was excellent in durability against impact.

Among the above examples, the guts obtained in Examples 2 and 7 and the conventional sheep gut and nylon gut were measured for physical properties such as tensile strength, elongation and durability, and the results shown in Table 1 were obtained. It was Further, the results of measuring the intrinsic strength of these guts by a dynamic viscoelasticity measuring device are shown in FIG. From these test results, it was confirmed that the gut of the present invention has smaller elongation and strength than the conventional product, and has excellent durability.

[0022]

[Table 1]

As for durability, the distance between the test hitting machine and the racket with the gut is set to 2 m, and the racket has a gut surface of 45 m.
The angle was determined by the number of hits of the ball until the gut was cut, with the ball from the test hitting machine hitting the gut in an obliquely hit state by 180 ° rotation.

[0024]

As described above, the gut of the present invention is woven on the aromatic polyamide fiber or the multifilament of carbon fiber as the core yarn, either alone or in combination with other fibers. Adhesion to the material of the core winding or side winding becomes strong, and it has high strength, flexibility, wear resistance, etc., and it has excellent durability and resilience against the shock most required for gut. Was there.

[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 sectional view showing another embodiment of the gut according to the present invention.

FIG. 6 is a sectional view showing another embodiment of the gut according to the present invention.

FIG. 7 is a sectional view showing another embodiment of the gut according to the present invention.

FIG. 8 is a diagram showing the strength with which a gut is inherent.

[Explanation of symbols]

 1 core yarn 2 core wound yarn 3 side wound yarn 4 coating layer 5 coating layer

Claims (6)

[Claims] 1. A multifilament of aromatic polyamide fiber or a monofilament or multifilament of this multifilament and nylon fiber, polyolefin fiber, carbon fiber is used as a core yarn, and a core winding yarn is wound around the outer periphery of the core yarn, and further, A gut made by winding a side winding on top and forming a resin coating layer on the outermost layer. 2. The gut according to claim 1, wherein the core winding yarn and the side winding yarn are monofilaments of aromatic polyamide fiber, nylon fiber, polyester fiber, polyolefin fiber, carbon fiber or multifilaments thereof. 3. The gut according to claim 1, wherein the resin coating layer is made of polyamide resin, polyolefin resin, fluororesin or silicone resin. 4. A multifilament of carbon fiber or a monofilament or multifilament of nylon fiber or polyolefin fiber and a multifilament of carbon fiber is used as a core yarn, and a core winding yarn is wound around an outer periphery of the core yarn, and a side winding yarn is further wound on the core winding yarn. And a resin coating layer formed on the outermost layer. 5. The gut according to claim 4, wherein the core winding yarn and the side winding yarn are monofilaments of aromatic polyamide fibers, nylon fibers, polyester fibers, polyolefin fibers, carbon fibers or multifilaments thereof. 6. The gut according to claim 4, wherein the resin coating layer is made of a polyamide resin, a polyolefin resin, a fluororesin or a silicone resin.