JP3117768B2 - Gut - Google Patents

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 fibers has been used. When this gut is used, it has excellent resilience, less slack, emits a pleasant hitting sound, and gives a player a pleasant hitting feel, but has the disadvantage of poor moisture resistance and a short service life.

In recent years, many guts using synthetic resins such as nylon and polyester have been proposed. For example, on the outer peripheral surface of a core material made of a polyamide resin monofilament, a core winding made of a large number of monofilaments having a smaller diameter than the core material is surrounded by an adhesive to surround the core material to form a wound layer, A core formed by coating the outer peripheral surface of this wound layer with a polyamide resin or a thermoplastic urethane elastomer, or a core composed of a large number of monofilaments having a smaller diameter than the core provided on the outer peripheral surface of the core so as to surround the core. Some have a monofilament side winding between the 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 a racket having such a gut stretched, the gut can be slightly stretched by a striking force to absorb some impact of a ball, but the gut is stretched with a predetermined tension. Because of the need, there are certain limits to absorbing shock. Further, in the conventional gut, the core windings of the same layer of the winding layer are wound around the outer periphery of the core material in close contact with each other, and this relatively large number of core windings is hardly distorted. Therefore, since the gut itself is not easily deformed, almost no ball impact can be absorbed.

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

[0006]

The [0007], since recently to solve the problems described above, the core yarn of a material strong, nylon or polyester abrasion resistance good para-aromatic polyamide textiles tensile or coated braid on the surface of, para-
A gut in which an aromatic polyamide fiber is twisted together with a nylon fiber or the like has been proposed.

[0007] However, although the gut having such a structure is excellent in tensile strength and abrasion resistance, it has a problem in that it is inferior in durability due to impact.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is intended to provide such a gut with 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 durability when the racket is used.

[0009]

SUMMARY OF THE INVENTION The present invention, meta-aromatic polyamide fibers in order to achieve the above object, namely poly meta-phenylene iso phthalamide fiber core yarn and constitute a gut Shinmakiito, Gawamakiito This is used as a part of the constituent fibers of the wound yarn.

[0010]

According to the gut of the present invention, the meta-based aromatic polyamide fiber is used as a part of the constituent fibers in the core yarn, core winding yarn, side winding yarn and the like constituting the gut as described above. Not only strength, but also flexibility and abrasion resistance,
In addition, a gut excellent in durability due to impact can be obtained.

As the meta-aromatic polyamide fiber used in the present invention, for example, a material mainly composed of metaphenylenediamine and isophthalic acid dichloride or a material composed of other materials may be used. The meta-aromatic polyamide fibers may be used as the fibers obtained by the multi-number set the filaments of about 100 to 1500 denier.

In the present invention, in addition to the above-mentioned meta-based aromatic polyamide fiber, a nylon fiber such as nylon 6, nylon 66, or a copolymer of nylon 6 and nylon 66 may be used as a core yarn, a core winding yarn, an outer winding. Used as yarn. Further, a knitting yarn wound using a meta-based aromatic polyamide fiber or a nylon fiber (also referred to as a braided yarn, in the present invention, the following knitting yarn)
By coating the outer periphery of the yarn with nylon, and further forming a coating layer of a fluororesin or silicone resin solution thereon, the knitting yarn is protected and a gut having the most preferable characteristics can be obtained.

[0013]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. Embodiment 1 FIG. 1 is a cross-sectional view of a gut showing one embodiment of the present invention, wherein 1 is a core yarn made of a 0.903 mmφ monofilament made of a copolymer of nylon 6 and nylon 66, and this core yarn is shown in FIG. 0.128mmφ of nylon 6 around 1
Twenty-five monofilaments were wound as core winding yarn 2. When the core winding 2 is wound, 1 is provided between the core winding 2 and the core 1.
As the inner winding yarn 3 only places were wound multifilament 200 denier meta-aromatic polyamide fibers. Further, two monofilaments of 0.234 mmφ nylon 6 are twisted (for example, triple winding) around the outer periphery of the core winding yarn 2 as two outer winding yarns 4 to obtain a knitting yarn A, and a molten nylon resin is applied to the knitting yarn A. A gut having the structure shown in FIG. 1 was obtained by coating to form a coating layer 5.

Example 2 0.98 comprising a copolymer of nylon 6 and nylon 66
A monofilament of 5 mmφ is used as the core yarn 1, and a monofilament of nylon 6 of 0.142 mmφ is provided around the core yarn 1.
This as Shinmakiito 2, the knitting yarn by winding it brought interposed specified locations in the two 200 denier multifilament meta-aromatic polyamide fibers as the inner winding yarn 3 between the two B
I got A nylon covering layer 5 was formed on the outermost layer of the obtained knitting yarn B in the same manner as in Example 1 to obtain a gut having the structure shown in FIG.

Example 3 0.98 comprising a copolymer of nylon 6 and nylon 66
5 mmφ monofilament is used as the core yarn 1
105 denier multifilament 1 of nylon 6 fiber
Zero denier and 200 denier of meta-based aromatic polyamide fiber
Two multifilaments as core winding yarns 2a and 2bWinding
And a nylon 42 of 0.142 mmφ
24 filaments as outer winding yarn 4WindingKnitting yarn C
After the nylon coating layer 5 is formed on the knitting yarn C,
A silicon resin coating layer 6 is provided on the
Got got.

Example 4 Four 200-denier multifilaments of meta-aromatic polyamide fiber were used as a core yarn 1a, and a core winding yarn 2a was formed around the core yarn 1a.
And four 840-denier multifilaments of nylon 66 fiber, and five 840-denier multifilaments of nylon 66 fiber and 0.162
five monofilament nylon 6 fiber mmφ to obtain a knitting yarn D is wound using as external winding yarn 4a and 4. Then, a gut having the structure shown in FIG. 4 was obtained by forming the nylon coating layer 5 on the outermost layer.

Comparative Example 1 0.98 comprising a copolymer of nylon 6 and nylon 66
A 5 mmφ monofilament is used as a core yarn 11 and a 0.142 mmφ nylon 6 monofilament 2 is provided around the core yarn 11.
Wound with four as Shinmakiito 12 to give the gut of the structure of FIG. 5 to form a nylon-coated layer 15 thereon.

Comparative Example 2 0.98 comprising a copolymer of nylon 6 and nylon 66
A 5 mmφ monofilament is used as the core yarn 11 and a 105 denier multifilament 11
Book and para-aromatic polyamide fiber (Kevlar)
Of 200 denier multifilament of the core winding yarn 12
a, wound as 12b, further 0.142m thereon
24 nylon 6 monofilaments of outer diameter 14
Then, a nylon coating layer 15 was formed on the outermost layer to obtain a gut having the structure shown in FIG.

Of the above embodiments, the first and second embodiments
The gut obtained in Example 1 and the guts obtained in Comparative Examples 1 and 2 were tested for wear resistance and dynamic rigidity using a wear tester. The results shown in Table 1 were obtained, indicating that the gut of the present invention was excellent. Admitted.

[0020]

[Table 1]

[0021]

As described above, the gut according to the present invention can be used as a constituent yarn of a core yarn, a core winding yarn, an outer winding yarn and the like .
By winding a monofilament or multifilament of meta-aromatic polyamide fibers on one part of its, while providing high strength, flexibility, performance with the conventional nylon gut such as abrasion resistance, and durability against impact It is possible to improve the performance most required for gut, such as performance.

[Brief description of the drawings]

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

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

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

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

FIG. 5 is an enlarged sectional view showing the structure of a conventional gut.

FIG. 6 is an enlarged sectional view showing the structure of a conventional gut.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Core thread 1a Core thread 2 Core thread 2a Core thread 2b Core thread 3 Inner thread 4 Outer thread 4a Outer thread 5 Nylon resin coating layer 6 Silicon resin coating layer

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) A63B 51/02

Claims (3)

(57) [Claims] 1. A winding a yarn of at least one layer composed of a plurality of the outer periphery of the core yarn, a gut having a resin coating layer of at least one layer around, the constituent fibers of the core yarn or Makiito A gut, wherein one part is a meta-aromatic polyamide fiber. 2. The gut according to claim 1, wherein the meta-based aromatic polyamide fiber is mainly composed of metaphenylenediamine and isophthalic chloride. 3. The gut according to claim 1, wherein the resin coating layer is made of a polyamide resin, a polyolefin resin, a fluororesin, or a silicone resin.