JPH0783778B2 - Synthetic resin gut - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a synthetic resin gut for use in a ball game racket such as tennis, badminton and squash, and more specifically, a core yarn made of a relatively thick monofilament. On the other hand, it is a synthetic resin gut for a racket having a structure in which a plurality of winding yarns made of a relatively thin monofilament is wound and adhered, and has excellent strength and durability,
In particular, the present invention relates to a synthetic resin gut which is suitable as a gut for a large racket.

[Conventional technology]

As a gut to be stretched on a ball game racket such as tennis, badminton and squash, animal fibers typified by whale muscle have been conventionally used, but synthetic fibers such as nylon have emerged, and their toughness and Since the gut characteristics such as durability have been evaluated, guts made of synthetic resin monofilament have rapidly spread in this kind of field.

And in this gut made of synthetic resin monofilament,
With the sophistication of the technique of ball game itself and its popularization in recent years, the required characteristics, especially in terms of competition, have become more diverse.

That is, more excellent performance has been required due to practical characteristics such as shot feeling, repulsion, controllability and durability.

On the other hand, with regard to racket materials, composite materials such as glass fiber and carbon fiber have come to be used in place of conventional bamboo and wood, and since these new materials are lightweight and have excellent toughness, they are large in size. It can be said that this has led to the birth of rackets and wide-body rackets.

However, with the advent and spread of wide-body rackets,
In reality, the performance requirements for guts have become even more severe than before.

For example, as the speed of competition has increased, the conventional gut has poor wind-cutting ability and cannot cope with the speed, and it is necessary to make the gut more fine gauge and stronger.

The present applicants have used a nylon 6 monofilament having a high degree of polymerization as a core yarn as a racket gut satisfying the above-mentioned new performance, and winding a plurality of nylon 66 monofilaments around the core yarn as a winding yarn and bonding them. It was found that the so-called gut having a so-called winding structure is effective, and it was previously disclosed
It was proposed as 59-101165 gazette.

[Problems to be Solved by the Invention]

However, the above-mentioned gut proposed by the applicants has a characteristic that it is stronger than the conventional product, and when it is stretched on a wide body racket and used for competition, it is not always sufficient in terms of durability. There was a problem that it was not possible to exert good performance and it was easy to cause the gut to be cut during the competition.

Therefore, the present inventors have further studied for the purpose of obtaining a gut for a high-strength racket that also has durability when stretched with a large racket, particularly a wide-body racket with high tension, and as a result, the present application described above. In the gut of the winding structure proposed by people, by using a copolymerized nylon monofilament consisting of a specific copolymerized composition as the core yarn instead of the high polymerization degree nylon monofilament,
The present invention has been accomplished by finding that a gut for a racket that meets the above-mentioned object and is excellent in hitting feeling such as resilience and controllability of hitting can be obtained.

[Means for Solving the Problems]

That is, the present invention has a solution viscosity of 4.0 or more as a core yarn,
The nylon 6 / nylon 66 copolymerization ratio is 90 / 10-80 / 20 (weight ratio), and the nylon 66 monofilament having a solution viscosity of 2.8-3.4 is used as the winding thread. The present invention provides a synthetic resin gut characterized in that a plurality of the above-mentioned wound yarns are wound around the outer periphery of the yarn and adhered to each other.

Hereinafter, the synthetic resin gut of the present invention will be described in more detail with reference to the drawings.

As shown in the partial perspective view of the drawing, the synthetic resin gut of the present invention has a relatively thick synthetic resin monofilament as the core yarn 1, and a plurality of relatively thin synthetic resin monofilaments, usually 2 to 3, around the core yarn 1. It has a winding structure in which 20 pieces are wound as a winding thread 2 and adhered with an appropriate adhesive 3.

In the present invention, the core yarn 1 constituting the gut having the above structure
As the solution viscosity is 4.0 or more, nylon 6 / nylon 66
The copolymerized nylon monofilament having a copolymerization ratio of 90/10 to 80/20 (polymerization ratio) is used as the winding yarn 2 and has a solution viscosity of 2.
8 to 3.4 nylon 66 monofilament is used.

By selecting the types of core thread and winding thread as described above,
Since the adhesiveness of the wound yarn to the core yarn is improved and the heat resistance and abrasion resistance of the wound yarn are more effectively exhibited, high strength is exhibited even with a thin gauge type gut. Moreover, it is possible to obtain excellent durability that can be stably used for a long time of competition.

That is, the solution viscosity of the core yarn is 4.0 or more, particularly 4.0 to
It is as high as 4.5, and by using a monofilament made of copolymerized nylon having a nylon 6 / nylon 66 copolymerization ratio of 90/10 to 80/20 (weight ratio), the tenacity is given to the gut and the core yarn The adhesiveness of the adhesive that is interposed between the yarn and the winding yarn is improved, and the negative factors such as the strength due to the adhesive and the decrease in the strength utilization ratio are eliminated.

However, the solution viscosity of the copolymerized nylon used as the core yarn is
If it is less than 4.0, the strength cannot be sufficiently increased, and the copolymerization ratio of nylon 6 in the copolymerized nylon is 90.
When the content exceeds the weight%, both strength and durability tend to decrease, which is not preferable.

Furthermore, as the winding thread, a monofilament made of nylon 66 having a normal degree of polymerization, that is, a nylon 66 monofilament having a solution viscosity of 2.8 to 3.4, particularly 3.0 to 3.2, may be used. As a result, the nylon 66 monofilament, which is the winding thread, exerts sufficient heat resistance and wear resistance, and as a result, the characteristics of the individual monofilaments of the core thread and the winding thread are maximized, so it is a fine gauge. However, it has the ideal effect of being totally superior in strength and durability.

In the present invention, the diameter of the monofilament that constitutes the core yarn and the winding yarn can be appropriately selected according to the type of racket to which the gut is applied, but even when it is configured as a fine gauge particularly for application to a large racket, its high The strength, durability and shot feel stability can be fully exerted.

The synthetic resin gut of the present invention is not limited to being colorless, and can be colored into a monofilament according to the purpose, and further, a weathering agent or a lubricant can be added to the monofilament to further improve the performance. it can.

In addition, especially for the copolymerized nylon monofilament that constitutes the core yarn, it is possible to have a structure in which a hollow portion communicating with the central portion is provided, and by enclosing oil in the hollow portion, the shot feeling and the like are further improved. It is possible to

The effects of the synthetic resin gut of the present invention will be further described below with reference to examples.

In addition, the solution viscosity in the present invention and the following examples,
A solution of synthetic resin dissolved in 98% concentrated sulfuric acid at a ratio of 1%,
The fall time was measured using an Ostwald viscometer, and 98%
It is the relative viscosity divided by the drop time of concentrated sulfuric acid alone.

〔Example〕

Solution viscosity is 4.4, nylon 6 / nylon 66 copolymerization ratio is 8
Copolymerized nylon tip of 5/15 (polymerization ratio) (manufactured by Toray Industries, Inc.)
6041), and the diameter by the usual melt spinning / drawing method.
A 0.87 mm monofilament (A) was produced.

Similarly, using a copolymerized nylon tip (6021XH manufactured by Toray Industries, Inc.) having a solution viscosity of 4.8 and a nylon 6 / nylon 66 copolymerization ratio of 95/5 (weight ratio), a monofilament (B ) Was manufactured.

Furthermore, a monofilament (C) having a diameter of 0.87 mm was manufactured using a high-polymerization degree nylon 6 chip having a solution viscosity of 4.2 (M1041 manufactured by Toray Industries, Inc.).

On the other hand, nylon 66 chips with a solution viscosity of 2.9 (Toray Industries, Inc.)
Manufactured by M3001) was used to produce a monofilament (D) having a diameter of 0.20 mm.

Next, these four types of monofilaments (A) to (D)
As shown in the table below, the core yarns and the winding yarns were combined, 13 winding yarns were wound around the outer periphery of the core yarns, and the gut (diameter 1.35mm) having a winding structure was obtained by bonding the winding yarns with a phenolic adhesive. .

The results of measuring the tensile strength and knot strength of the three types of gut thus obtained are also shown in the following table.

From the above results, the synthetic resin gut of the present invention (No. 1)
Has improved strength as compared with the gut (No. 2) using a monofilament having a large amount of nylon 6 component as the core thread and the gut (No. 3) using a nylon 6 monofilament.

In addition, when the above three types of gut were stretched on a wide-body tennis racket and put to practical use in tennis competitions, No. 1 gut has stable ball repulsion and controllability, and has a long time. Even in the competition, there was little looseness and misalignment of the gut, and there was no fear of cutting, and the durability was excellent.

On the other hand, as a result of subjecting No. 2 and No. 3 guts to the same practical tennis, as compared with No. 1 gut, loose gut and misalignment were more likely to occur, ball hit stability was lacking, and gut cut It often happened.

〔The invention's effect〕

As described above, the synthetic resin gut of the present invention has high strength and excellent durability, and has optimum performance as a gut for ball games such as tennis, badminton, and squash, especially for large rackets. There is.

[Brief description of drawings]

The drawing is a partial perspective view of the synthetic resin gut of the present invention. 1 ... core thread, 2 ... winding thread, 3 ... adhesive.

Front page continued (72) Inventor Kiyoshi Amano 1 Toray Monofilament Co., Ltd. Showa-cho, Okazaki City, Aichi Prefecture Toray Monofilament Co., Ltd. (56) References Japanese Patent Laid-Open No. 59-101165 (JP, A) Actually developed 56-28358 (JP, U)

Claims (1)

[Claims] 1. A core thread having a solution viscosity of 4.0 or more and a nylon 6 / nylon 66 copolymerization ratio of 90/10 to 80/20 (weight ratio).
The copolymerized nylon monofilament is used as the winding yarn, and the nylon 66 monofilament having a solution viscosity of 2.8 to 3.4 is used as the winding yarn. A plurality of the winding yarns are wound around the outer periphery of the core yarn and are bonded to each other. Gut made of synthetic resin.