JPS59101165A - High strength 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 a synthetic fiber gut used for badminton, squash, tennis, etc.

The purpose of the present invention is to provide a string with a structure in which a plurality of windings ω are wound around a core yarn and bonded together, and the string has high strength by specifying the bath liquid viscosity of the synthetic resin monofilament that constitutes the string. .

Whale muscle, an animal fiber, has traditionally been used to make strings for rackets used for ball games such as badminton and squash. However, with the advent of synthetic fibers such as nylon, they have been praised for their excellent toughness and durability, which suit the properties of guttets, and in recent years, nylon guttets have rapidly become popular. It has become popular. As the technology of the ball game itself has become more sophisticated and its use among the general public, the characteristics required for synthetic fibers have become more diverse. In other words, the feel at impact is 9.

There is a growing demand for improvements in practicality such as better controllability and better durability. Synthetic fibers have a high degree of processing freedom, so they have gradually met these required properties and responded to advances in competition technology.

On the other hand, with the advent of new materials for rackets, carbon fiber has recently begun to be used instead of bamboo and wood, which are lightweight and have excellent toughness. Its use led to the use of large rackets.

However, with the advent and spread of large rackets, the required characteristics for gut have become more severe than ever. In other words, as competitions have become faster, it has become clear that conventional gutts have poor wind performance and cannot keep up with the speed. Therefore, the need for &lII gauge gutts arose. In other words, as the racket material becomes stronger and stronger, the strings attached to the racket must be made thinner and stronger than before, which increases the demands of players. It has become impossible to do so.

In view of these circumstances, the inventors have made extensive studies to meet the above requirements, and have now succeeded in developing a high-strength gut. Therefore, the present invention provides a thin gauge type high strength gut.

That is, this invention uses nylon 6 with a solution viscosity of 3.80 or more for the core yarn, and uses nylon 6 with a solution viscosity of 2.80 to 3.
．． The gist of this product is a high-strength synthetic resin gutt characterized by the use of 40% nylon 66. Hereinafter, an example of this will be described in detail based on the accompanying drawings.

As shown in FIG. 1, the gutt according to the present invention has a relatively thick synthetic resin monofilament 1 as a core, a plurality of relatively thin synthetic resin monofilaments 2 are wound around the core, and a suitable adhesive is applied to the string. Glue the core thread and winding wire in step 3 and fc
Groove structure.

By the way, the core yarn and winding wire, which are the first phosphoric acid unit of a cut having such a structure, have conventionally been made of nylon 6 and have a solution viscosity within the range most commonly used. , 0 (17-3,60) was used. Therefore, the string diameter could not be made very small. However, if it were a conventional size racket, it would be 1.40 mm '44 degrees. There was no problem with using a cut with a thickness of .However, by using lightweight yet strong carbon fiber for the racket material, it was decided to use a gutsy one for large rackets that had a wider ball hitting surface than before. Therefore, it is necessary to have a gut with a finer gauge than before.If a polymer with the structure described above is used, it is difficult to make a narrow gauge gut with sufficient strength. In other words, adaptation to large rackets involves reducing the diameter 1a of the strings, but with conventional IM polymers, the strength decreases due to the thinning of the gauge, and the tension required when stringing the strings on the racket decreases. This is because not only will it not be able to withstand the tension, but it will also not be able to withstand the force of hitting the ball.

In this invention, by specifying the type and solution viscosity (degree of polymerization) of nylon used for the core yarn and winding wire, which are each monomer constituting the gut, as described below, it is possible to obtain a thin gauge. Despite this, it has the guts of a highly powerful type. In other words, the essence of this invention is x'u
Although it is a + gauge, it is as strong as a conventional 1.40 mm racket and has properties suitable for large rackets.

In this invention, KaF tlo・! Highly polymerized nylon 6 is used as the synthetic resin for the core yarn, which is one of the acid units. That is, a solution having a viscosity of 3.80 to 4.50 (preferably 4.00 to 4.20) is used.

Nylon 66 with a normal degree of polymerization is used as the synthetic resin for the winding, which is the other structural unit.

That is, the solution viscosity is 2.80 to 3.40, preferably 3.
00 to 3.20 is used.

The reason why a high-strength string can be obtained by processing a string using such a core and winding wire will be described below.

Normally, in such core-winding adhesive type guts, the strength of the gut is not the sum of the individual strengths of the synthetic resin monofilaments that are constituent units. This is because negative factors such as a decrease in strength due to the influence of the adhesive used and a decrease in strength utilization rate due to the structure act, and the strength utilization rate with respect to the string of the yarn decreases to 80 to 90 yen. Therefore, it is necessary to take measures that will minimize the decline in strength due to these negative factors. That is, for a relatively thick monofilament made of nylon 6 used as a core, it is preferable to use a raw material with a high degree of polymerization. By using nylon with a high degree of polymerization with a solution viscosity of 3.80 to 4.50, preferably 4.00 to 4.20, it is possible to achieve high strength, high toughness, and improvement in repeated stretching fatigue, compared to conventional products. It is possible to achieve an improvement in the power utilization rate of about 5 to 10% compared to the conventional method. Furthermore, by using nylon 66 with a solution viscosity of 2.80 to 3.40, preferably 3.00 to 3.20, as the raw material for the relatively thin synthetic resin monofilament used as the winding wire, dissolution by the adhesive is avoided. This reduction in strength can be avoided, the impact resistance can be further improved, and the strength utilization rate can be improved by about 5 to 10% compared to the conventional nylon 6. By selecting the type of synthetic resin used for the core and winding wire in this manner, the strength of the raw yarn can be utilized to the fullest for the stringiness after processing. In this way, we were able to reduce the diameter of the final product, the gut, while maintaining the same strength as before.

The gutt of this invention is not limited to being colorless, but can be colored to enrich the color depending on the purpose, and weathering agents, anti-friction agents, etc. can also be added. Furthermore, as for the core yarn, a so-called hollow monofilament can also be used in which a void is provided in the core.

Further, the diameters of the core and winding wire constituting the gut can be appropriately selected depending on the use of badminton, squash, tennis, etc.

Since the gut according to the present invention has a +1° Y configuration as described above, it can have high strength even though it has a small diameter.

Therefore, a large carbon fiber racket strung with this material has practicality (speed, anti-celebration power).

It is excellent in terms of feel at impact) and has the durability required for competition.

[Examples and comparative examples]

Nylon 6 chip M1021 (solution viscosity 3
．． 40) and M1041 (solution viscosity 4.20),
and nylon 66 chip M3001 (solution viscosity 3
．． 00), and each was spun into monofilaments having the diameters listed in Table 1 by a conventional melt-spinning and drawing method.

(Margins below) Next, one piece of these monofilaments was used as shown in Table 2 and processed into a core-wound type gut as shown in FIG. During processing, phenol, which is a nylon solvent, was used as the core-winding adsorbent. Furthermore, the gut surface was coated with nylon A'u fat liquid.

Table 2 shows the relationship between the diameter and strength of the guts obtained.

(Margins below) When the strings obtained in the examples were attached to a large racket and tested, the ball had a rebound force of 9 and a noise, and the controllability of the ball was excellent, and there was no loosening of the strings or misalignment. In that respect, the comparative example was not good.

The solution viscosity referred to here is calculated by dissolving the synthetic resin at a ratio of 1 part in 98 parts concentrated sulfuric acid, measuring the falling time using an Ostwald viscometer, and dividing by the falling time of 98 parts concentrated sulfuric acid alone. Relative viscosity.

[Brief explanation of the drawing]

FIG. 1 is a partial perspective view showing a section of a core-wound type gut according to the present invention.

Claims (1)

[Claims] (1) In gutts with a structure in which multiple windings are wound and glued around a core thread, nylon 6 with a solution viscosity of 3.80 or more is used for the core thread, and nylon 6 with a solution viscosity of 2.80 to 3.40 is used for the winding wire. A high-strength gutt made of synthetic 1-part fat, characterized by the use of 66.