JPH11293575A - Rope, its production, and net for sport - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rope having excellent durability, especially excellent durability against forces repeatedly added in the lateral directions of fibers and suitable for use as sport nets, to provide a method for producing the same, and to provide a sport net comprising the ropes and having excellent durability. SOLUTION: The rope is obtained by covering the periphery of a core material 2 comprising aramide fibers with a braid 3 and further forming a synthetic resin coating layer 4 on the outer periphery of the braid 3. The method for producing the rope comprises covering the periphery of the core material 2 comprising the aramide fibers and having or not having a core wire 1 with the braid 3 comprising polyester-based fibers blended and twisted with low melting point fibers, thermally treating the obtained rope-like product to melt and solidify the low melting point fibers, and subsequently forming the synthetic resin covering layer 4 on the outer periphery of the braid 3. A net for sport is obtained by processing the ropes or ropes obtained by the above method. When the ropes are applied to either of a net for volleyball, a net for tennis and a net for badminton, an excellent durability-improving effect is expressed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rope suitable for use as a sports net, which has excellent durability, especially durability against a force repeatedly applied from the lateral direction of the fiber.
The present invention relates to a method for manufacturing the same and a durable sports net comprising the rope.

[0002]

2. Description of the Related Art Aramid fibers have high strength, high elastic modulus, and excellent weather resistance and heat resistance, and are used in various applications by utilizing these characteristics.

[0003] Application of aramid fibers to the field of various ropes has been studied in the past, but ropes made of aramid fibers have excellent abrasion resistance in order to prevent damage to external forces. The mainstream is a material composed of a combination of various kinds of fibers in combination with other fibers.

In Japanese Utility Model Publication No. 7-21596,
A rope is disclosed in which a low melting point yarn layer is provided between an inner layer and an outer layer made of aramid fiber, and the inner layer and the outer layer are fused and tightly integrated through the low melting point yarn layer.

That is, aramid fibers generally have an unfavorable tendency to be extremely resistant to tensile force in the longitudinal direction, but to be deformed and broken when subjected to a force from the lateral direction of the fiber. For this reason, it was necessary to use it in combination with another fiber as described above, or to fuse it through a low melting point yarn layer.

However, in the above-mentioned conventional aramid fiber rope, although the abrasion resistance can be certainly improved, the fatigue resistance to the force repeatedly applied from the lateral direction of the fiber has not reached a practical level. ,
Applying this rope as a sports net such as a net for volleyball, a net for tennis and a net for badminton has a problem in terms of durability.

[0007]

SUMMARY OF THE INVENTION The present invention has been achieved as a result of studying to solve the problems in the prior art described above.

Accordingly, an object of the present invention is to provide a rope which is excellent in durability, in particular, durability against a force repeatedly applied from the lateral direction of the fiber, and which is suitable for use as a sports net, a method for producing the rope, and a durability comprising the rope. An object of the present invention is to provide an excellent sports net.

[0009]

In order to achieve the above-mentioned object, the rope of the present invention has a core material made of aramid fiber covered with a blade, and a synthetic resin coating layer is formed on the outer periphery of the blade. It is characterized by the following.

[0010] In the rope of the present invention, the core material has a core wire at the center, the blade is made of polyester fiber mixed and twisted with low melting point fiber, and the melting point of the low melting point fiber is 8%.
0 to 160 ° C., the low-melting fiber is made of polyamide fiber, the twist ratio of the low-melting fiber is 3 to 20% by weight of the whole blade, and the synthetic resin coating layer is made of a thermoplastic resin, especially It is a preferable condition that it is made of a plastic polyester elastic body or a thermoplastic urethane elastic body.

Further, in the method for producing a rope according to the present invention, the periphery of a core made of aramid fiber having or not having a cord is covered with a braid made of polyester fiber mixed and twisted with a low melting point fiber, After the low-melting-point fiber is melted and solidified by heat-treating a material, a synthetic resin coating layer is formed on the outer periphery of the blade.

In the method for producing a rope according to the present invention, polyamide fibers having a melting point of 80 to 160 ° C. are used as the low-melting fibers, and the heat treatment is performed at a temperature 10 to 30 ° C. higher than the melting point of the low-melting fibers. Is a preferable condition.

Further, the sports net according to the present invention is characterized in that the rope or the rope obtained by the above-mentioned method is processed into a net shape, and may be any one of a volleyball net, a tennis net and a badminton net. Excellent effect when applied.

[0014]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail.

First, the configuration of the rope of the present invention will be described with reference to the drawings.

FIG. 1 is a cutaway perspective view showing an example of a rope according to the present invention. This rope has a core 2 made of aramid fiber having a core wire 1 at the center, and a blade covering the periphery of the core 2. 3 and a synthetic resin coating layer 4 formed on the outer periphery of the blade 3.

Here, the core wire 1 is formed from a twisted yarn such as a polyamide-based fiber, a polyester-based fiber, and a polyurethane-based fiber, and the material is not particularly limited.

In the rope of the present invention, the cord 1 is not always essential, and may be omitted in some cases.

The core material 2 is formed by twisting or knitting a plurality of wholly aromatic or copolymer aramid fibers.

As the material of the blade 3, polyester fibers obtained by kneading polyamide-based low-melting fibers are preferably used. Among them, polyethylene terephthalate fibers obtained by kneading low-melting copolyamide fibers are most preferable.

The low melting point fiber used here is preferably one having a melting point of 80 to 160 ° C. If the melting point is lower than 80, the rope in use may be softened, and the temperature may exceed 160 ° C. In this case, it is necessary to increase the melting point of the polyester-based fiber to be combined therewith, and the choice of the polyester-based fiber is reduced, which is not preferable.

The mixing ratio of the low-melting fiber in the blade 3 is preferably in the range of 3 to 20% by weight, particularly 5 to 15% by weight of the entire blade. When the content exceeds 20% by weight, the rope becomes too hard and its practicality is reduced, which is not preferable.

As the synthetic resin for forming the synthetic resin coating layer 4, it is most preferable to use a thermoplastic resin, in particular, a thermoplastic polyester elastic body or a thermoplastic urethane elastic body.

In the rope of the present invention having the above structure, the core material 2 made of aramid fiber is covered and protected by a moderately hard blade 3 and a synthetic resin coating layer 4 having a moderate elasticity. In contrast, fatigue resistance when a force repeatedly applied from the lateral direction is applied is improved, and the durability of the entire rope becomes extremely excellent.

In manufacturing the rope of the present invention, first, a core wire is prepared as required, and a core material made of aramid fiber is arranged around the core wire.

Next, the periphery of the core material is covered with a blade made of polyester fiber in which low-melting-point fibers are twisted, and this is heat-treated to melt and solidify the low-melting-point fibers to obtain a rope.

Next, by forming a synthetic resin coating layer on the outer periphery of the melted and solidified blade of the rope-shaped material, the rope having the above-described structure can be manufactured efficiently.

In this case, as the low melting point fiber,
As described above, it is desirable to use a polyamide-based fiber having a melting point of 80 to 160 ° C., and performing a heat treatment of the blade at a temperature 10 to 30 ° C. higher than the melting point of the low-melting fiber to melt the low-melting fiber. A blade formed by bonding and curing polyester fibers can be formed.

As a method for forming the synthetic resin coating layer, known means such as coating with a molten resin, coating with a synthetic resin tube, and coating with a resin solution can be applied. About 0.5 to 2 mm is sufficient.

Thus, the rope obtained by the production method of the present invention has excellent fatigue resistance against the force repeatedly applied from the lateral direction of the fiber as described above. When applied to a sports net such as a net for volleyball, a net for tennis, and a net for badminton, an excellent effect of improving durability is exhibited.

[0031]

EXAMPLES The structure and effects of the present invention will be further described below with reference to examples.

Example 1 Eighteen 1260 denier nylon 6 fibers ("Nylon" manufactured by Toray Industries, Inc.) were aligned and twisted to form a core.

Further, a core material was formed by subjecting 30 pieces of 300 denier aramid fiber ("Kevlar" manufactured by Du Pont-Toray Co., Ltd.) to a single twisting process, and this core material was disposed around the core wire.

Next, a low melting point copolyamide fiber of 100 denier and a melting point of 110 ° C. (“Elder” manufactured by Toray Industries, Inc.)
And a 1500 denier polyethylene terephthalate fiber ("Tetron" manufactured by Toray Industries Co., Ltd.) that is twisted one by one, and using a blade method, a blade is formed on the outer periphery of the core material by a blade method to form a rope-like material. Obtained.

The rope-like material is continuously passed through a dryer heated to 125 ° C. to melt the low-melting-point copolymerized polyamide fiber, and then, on the outer periphery of the blade, a thermoplastic polyester elastomer (Dupont Toray) “Hytrel 724”
7 ″) was coated so as to have a thickness of 1.0 mm to obtain the rope of the present invention.

A durability test was performed on this rope to measure the number of cycles until breaking when the winding / unwinding was repeated at a winding speed of 80 revolutions / minute in a cycle of 30 seconds. The number of cycles: 358, which was extremely excellent in durability.

[Comparative Example 1] A rope obtained by forming a blade only with polyethylene terephthalate fiber without using a low melting point copolymerized polyamide fiber in Example 1, and having the same durability as in Example 1 As a result of the test, the number of cycles was 132 times, indicating poor durability.

[Comparative Example 2] A durability test was performed on the rope obtained in Example 1 by omitting the formation of the synthetic resin coating layer in the same manner as in Example 1. The number of cycles was 71 times. The durability was extremely poor.

[0039]

As described above, the rope of the present invention covers and protects the core material made of aramid fiber with a moderately hard blade and a synthetic resin coating layer having a moderate elasticity. In contrast, fatigue resistance when a force repeatedly applied from the lateral direction is applied is improved, and the durability of the entire rope is extremely excellent.

Further, according to the rope manufacturing method of the present invention, a rope having the above excellent characteristics can be efficiently manufactured.

The sports net obtained by processing the rope of the present invention into a net shape exhibits an excellent durability improving effect when applied to a volleyball net, a tennis net, a badminton net and the like. I do.

[Brief description of the drawings]

FIG. 1 is a cutaway perspective view showing an example of a rope according to the present invention.

[Explanation of symbols]

 Reference Signs List 1 core wire 2 core material 3 blade 4 synthetic resin coating layer

Claims (13)

[Claims] 1. A rope comprising a core made of aramid fiber covered with a blade, and a synthetic resin coating layer formed on the outer periphery of the blade. 2. The rope according to claim 1, wherein the core has a core wire at the center. 3. The blade according to claim 1, wherein the blade is made of a polyester fiber mixed and twisted with a low melting point fiber.
Or the rope according to 2. 4. The melting point of the low melting point fiber is 80 to 160 ° C.
The rope according to any one of claims 1 to 3, wherein 5. The rope according to claim 1, wherein the low melting point fiber is made of a polyamide fiber. 6. The twist ratio of the low melting point fiber is 3 to 20% by weight of the whole blade.
The rope according to any one of claims 5 to 10. 7. The rope according to claim 1, wherein the synthetic resin coating layer is made of a thermoplastic resin. 8. The rope according to claim 1, wherein the synthetic resin coating layer is made of a thermoplastic polyester elastic body or a thermoplastic urethane elastic body. 9. The heat treatment of the rope-shaped material is performed by covering the periphery of a core made of aramid fiber with or without a core wire with a blade made of polyester fiber mixed and twisted with a low melting point fiber, and heat-treating the rope. A method for manufacturing a rope, comprising: forming a synthetic resin coating layer on the outer periphery of the blade after melting and solidifying the melting point fiber. 10. The low melting point fiber has a melting point of 80 to 80.
The method for producing a rope according to claim 1, wherein a polyamide fiber at 160 ° C is used. 11. The method according to claim 9, wherein the heat treatment is performed at a temperature higher by 10 to 30 ° C. than the melting point of the low melting point fiber.
Or the method for producing a rope according to 10. 12. The rope according to any one of claims 1 to 8 or the rope obtained by the method according to any one of claims 9 to 11 is processed into a net shape. Sports net. 13. The sports net according to claim 12, wherein the net is one selected from a volleyball net, a tennis net, and a badminton net.