JPS61103458A - Gut - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improving the grip of rackets for tennis, badminton, and the like.

Guts in rackets such as tennis and badminton are
Although the racket frame is stretched under high tension, the contact area between the warp and weft threads may wear out and break due to the repeated impact force when hitting the ball. That is, it is thought that the accumulation of frictional heat generated at the intersection of the warp and weft threads of the gut due to the impact force when the ball is hit accelerates wear, but no effective measures have been taken at present.

The present invention has been made in view of these points, and it is an object of the present invention to provide a long-life gut that can prevent wear and tear due to impact force when hitting a ball over a long period of time by using NOo 2 . Therefore, a feature of the present invention is that the outer periphery of the gun 1 to the main body made of synthetic resin filaments is covered with a synthetic resin layer containing whiskers, which are single crystal fibers.

Hereinafter, the present invention will be explained in detail based on drawings showing examples.

In FIG. 1, which shows a cross section of a gutt, 1 is a core body made of a thick synthetic resin monofilament, that is, a gutt main body, and around the gutt main body 1, there are a number of thin yarns 2 made of thin synthetic resin monofilaments.・is wrapped around it. Furthermore, a large number of outermost layer yarns 3 made of synthetic resin monofilaments of the same diameter and the same material as the outer layer yarns 2 are layered from above the outer layer yarns 2. ... are layered via a synthetic resin layer 4 that contains whiskers, which are high-strength single crystal fibers, and has adhesive properties.

The whisker mixed into the synthetic resin layer 4 is potassium titanate whisker (K, 0.nTi0 (n is 1).
(above)), silicon carbide (SiC), etc. can be used alone or as a mixture of two or more types, but potassium titanate whiskers are economically preferred.

Table 3 shows the characteristic values of potassium titanate whiskers and silicon carbide whiskers.

Table I Such whiskers can also be surface-treated with an amino-based silane coupling agent, an epoxy-based silane coupling agent, or an alkyl titanate-based surface treatment agent. Furthermore, the whiskers have an average fiber length of 5 μm or more.
200 μm, a fiber diameter of 0.1 μm to 5 μm, and an aspect ratio of 200 to 1500 are desirable. The amount of whiskers used is 2 to 2 to 100 parts by weight of the synthetic resin.
The amount is preferably in the range of 80 parts by weight, and particularly preferably in the range of 5 to 30 parts by weight.

Note that as the adhesive, a polyester resin or a polyamide resin adhesive such as a nylon resin solution is used.

Potassium titanate whisker Nitismo D on nylon 6
(Otsuka Chemical Co., Ltd. M) at 15% and 20%, Tismo D treated with titanate coupling and filled at 15%, and no Tismo D at all, the physical properties are shown in Table 2.

No. 5 Fig. 2 shows another embodiment, in which a large number of outer layer yarns 2 are wound around the gut main body 1, and a synthetic resin layer containing whiskers is further applied on top of the gutt main body 1, similar to the embodiment shown in Fig. 1. 4 to cover the entire outer periphery, and the outermost layer yarn 3 in FIG. 1 is omitted.

In addition, in each of the above embodiments, Gutto main body 1 and NOo
6 As the outer layer yarn 2 and the outermost layer yarn 3, nylon or other synthetic resin filaments can be used.

Next, the experimental results of the fire resistance of the gun A according to the present invention and the conventional Gut 13 are shown in Table (2). The experimental method was based on the method disclosed in Japanese Utility Model Publication No. 52-54437, as shown in FIG. weight 3,7
A weight 5 of 1 kg is tied and suspended, and a connecting piece 9 is fixed at the other end to the rotating shaft 8 of the motor 7 via a pulley 6.
It is rotatably connected to the tip of the shaft, and is caused to perform one reciprocating motion per second with an amplitude of 16 cm by the rotation of the motor 7, and the number of times until the guts X1 and X2 that are in sliding contact with each other break due to friction is determined. In addition, the sample included Guttu A of the present invention.
As Gutto B, we used a nylon multifilament twisted yarn whose surface was coated with 6 nylon resin containing 20% Tismo D, and as conventional Guttu B, we used a nylon multifilament twisted yarn whose surface was coated with the same 6 nylon resin. there was.

NOl 7 Table ■ As is clear from Table ■1, the gaff [AC3
1 Significantly superior durability compared to conventional Gaff+/B.

The present invention has effectively achieved its intended purpose with the configuration described in detail above. That is, since the outer layer (circumference) of the gut main body 1 made of synthetic resin filaments is covered with a synthetic resin layer 4 containing whiskers, which are single crystal fibers, the gut is reduced due to the strong frictional force between the warp and the weft when the ball is hit. The wear to0 and the degree of cutting were greatly improved, and a long-life gut with durability I11 was realized.

[Brief explanation of the drawing]

FIG. 1 is an enlarged cross-sectional view of a gasket showing one embodiment of the present invention, and FIG. 2 is an enlarged cross-sectional view of a gasket showing another embodiment.
FIG. 3 is a simplified diagram showing the test method for Gutt's durability. 1...Gut main body, 4...Synthetic resin layer.

Claims (1)

[Claims] 1. A gut formed by covering the outer periphery of a gut main body 1 made of synthetic resin filaments with a synthetic resin layer 4 containing whiskers, which are single crystal fibers.