JPH04124173U - ball for ball games - Google Patents

Abstract

(57) [Summary] [Purpose] A ball base is formed using a thermoplastic elastomer material, and the ball base is provided with the necessary conditions for a ball, such as impact relaxation, rebound resilience, and shape retention. [Structure] The 10% elongation stress of the thermoplastic elastomer that is the ball base material is set within the range of 30 to 190 Kg/cm ² .

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

In this invention, compressed air is sealed inside a soccer ball, etc., and it hits the player's body directly. Concerning a ball for a game that is played or kicked with the foot.

0002

[Conventional technology]

With this type of ball, the ball hits the player's body directly, so the impact It is necessary to slow down the attack, and to make it easier for athletes to control with their bodies and feet, It is necessary to have a high degree of rebound resilience. Such properties are provided by the ball base. Ru. The most typical conventional ball base is butyl rubber for sealing compressed air. Approximately 3000 m of nylon thread is wound around the surface of the tube on an endless track. It is composed of a thread-wound reinforcing layer formed by Multiple sheets are placed on the surface of the ball base. leather panels are glued together via a thin layer of rubber. In the case of a soccer ball, there are 12 pentagons. The entire surface is covered with a shaped leather panel and 20 hexagonal leather panels.

0003 The ball base with the above structure requires a lot of man-hours and time to construct, and the work is complicated. Therefore, in order to deal with this, the ball base was made of thermoplastic elastomer by rotational molding. A method of integrally forming it has been proposed (Japanese Unexamined Patent Publication No. 53-4634). .

0004

[Problem that the idea aims to solve]

The technique disclosed in the above-mentioned publication involves forming a ball base from a thermoplastic elastomer, specifically a polyester elastomer. Normally, commercially available thermoplastic elastomers have a 10% elongation stress of about 1 to 200 kg/cm ² , which is an extremely wide range, and it is extremely difficult to manufacture a ball that can be used as a ball base without being limited by this. That is, since internal pressure from compressed air is applied to the ball base, if the elongation stress is too small, the entire ball may swell over time. Furthermore, if the elongation stress is too large, the deformation upon impact will be small, and you may feel pain when it hits your body. Furthermore, if the elongation stress exceeds a predetermined range, there is a problem that appropriate rebound resilience cannot be obtained, and as a result, appropriate bounce cannot be obtained.

[0005] This invention was made in view of these circumstances, and it We created a ball base using Tomer material and conducted various experiments to meet the conditions required for the ball. As a result of our experiments, we focused on the elongation stress and found that if we set this within a predetermined range, the ball Various properties such as shock absorption, shape retention, rebound resilience, etc. are within appropriate ranges. They obtained the knowledge that it could be accommodated, and came up with the present invention.

[0006]

[Means to solve the problem]

In the present invention, a thermoplastic elastomer material is formed into two hemispherical hollow bodies by injection molding, the hemispherical hollow bodies are joined to form a spherical hollow body, and the thermoplastic elastomer material is formed into a spherical hollow body at an appropriate position in the first hemispherical hollow body. The ball base is made up of a ball base in which compressed air is sealed through a provided air injection valve, and a plurality of leather panels bonded to the surface of the ball base with an adhesive, and the thermoplastic material forming the ball base is The elastomeric material has a 10% elongation stress in the range of 30 to 190 kg/cm ² .

[0007]

【Example】

In Figure 1, 1 and 2 are two hemispherical hollow bodies made of injection molded thermoplastic elastomer. Formed using the shape method. A valve 3 is integrally formed at the center of the center 1 of the first hemispherical hollow body 1. It is shaped. For a size 5 soccer ball, the outer circumference of the end is approximately 6 7 cm, and the wall thickness is set to approximately 0.5 to 2.5 mm. These two hemispherical hollow bodies 1 , 2, each end is heated and softened or melted and joined to form a spherical hollow ball. A base body 4 is formed. The heating of the ends of the two hemispherical hollow bodies 1 and 2 is performed so that each end faces each other. This is done by placing the heat plates at regular intervals and interposing a hot plate in the gap. heat The plate and the ends of each hemispherical hollow body 1 and 2 are slightly apart, so a hot plate is placed at the end of the hollow body. It will not be deformed by contact. When joining hollow bodies, place the hot plate between the hollow bodies. The two are then pulled out and placed on top of each other.

The thermoplastic elastomer constituting the ball base 4 must have a 10% elongation stress in the range of 30 to 190 kg/cm ² . If this value does not reach 30 kg/cm ² , the ball will expand and deform due to internal pressure, and the ball will not be able to maintain its designed size. On the other hand, if this value exceeds 190 kg/cm ² , the deformation upon impact will be too small, resulting in an increased hardness of the ball, causing pain when the ball hits the body, hands, feet, etc. Furthermore, if this value is too large, a bounce height suitable for ball manipulation cannot be obtained, and a ball suitable for competitions cannot be achieved. If the 10% elongation stress is within the above range, the rebound resilience (JISK6301) will be in the range of 40 to 80%, and a bounce height suitable for soccer ball games, basketball games, and volleyball games can be obtained.

[0009] The thermoplastic elastomer having the above characteristics may be selected from among the elastomers listed below. It can be obtained by selecting different grades and using them alone or by blending multiple types. It will be done. thermoplastic polyurethane Parabrene (registered trademark, manufactured by Nippon Polyurethane Industries Co., Ltd.), Takelac (registered trademark) Trademark, Takeda Birdish Urethane Industries Co., Ltd.). Polyester thermoplastic elastomer Pelprene (registered trademark, manufactured by Toyobo Co., Ltd.), Hytrel (registered trademark, manufactured by Toray Boseki Co., Ltd.) DuPont Corporation). Polyamide thermoplastic elastomer Glilax A (registered trademark, manufactured by Dainippon Ink and Chemicals Co., Ltd.). Polyolefin thermoplastic elastomer Sumitomo TPE (manufactured by Sumitomo Chemical Co., Ltd.), Milastomer (registered trademark, Mitsui Petrochemical Co., Ltd.) Manufactured by Gakukogyo Co., Ltd.). Styrenic thermoplastic elastomer Tuffprene (registered trademark, manufactured by Asahi Kasei Corporation), Clayton (registered trademark, Sheet) (manufactured by Le Kagaku Co., Ltd.). Polyvinyl chloride thermoplastic elastomer Sumiflex (registered trademark, manufactured by Sumitomo Bakelite Co., Ltd.), Sunplane (registered trademark) (registered trademark, manufactured by Mitsubishi Monsanto Chemical Co., Ltd.). Polybutadiene thermoplastic elastomer JSR RB (manufactured by Japan Synthetic Rubber Co., Ltd.).

0010 In the case of a soccer ball, an adhesive such as a polyurethane adhesive is applied to the surface of the ball base 4. Leather panels made by cutting natural leather or synthetic leather into hexagonal and pentagonal shapes using an adhesive. 5, 5... are glued together. The edges of each leather panel 5, 5... are removed obliquely, Narrow grooves 6, 6... are formed at the boundaries between adjacent leather panels 5, 5.... 7 is a bar The insect rubber that forms part of the valve 3 is removably attached to the valve 3, and air is injected into it. Compressed air is injected into the ball base 4 by inserting the needle.

[0011] As a thermoplastic elastomer material, a polyester elastomer, Pelprene (registered trademark, manufactured by Toyobo Co., Ltd.) was used to form a ball base with a wall thickness of 1.3 mm, and a leather panel was adhered to this to form a No. 5 ball base. A soccer ball of the same size was prepared, and the internal pressure of the ball was set to 0.6 Kg/cm ² , which is the same as a regular soccer ball. The elastomer material had a 10% elongation stress of 74 Kg/cm ² and the ball had a rebound resilience of 50.4%, making it suitable for use as a soccer ball. In addition, the impact when it hit a player was almost the same as that of a conventional pincushion ball, and there was almost no pain. Furthermore, the deformation during kicking was appropriate and the feel was also favorable. Even after being left for 6 months while maintaining the internal pressure, no expansion deformation occurred, and it was confirmed that the product had excellent shape retention.

0012

[Effect of the idea]

According to the present invention, two hemispherical hollow bodies are formed of a thermoplastic elastomer material, and these are joined to form a ball base, and the 10% elongation stress of this material is in the range of 30 to 190 kg/cm ² By setting the ball within the range, it is possible to satisfy the necessary conditions for a ball, such as impact mitigation, rebound resilience, and shape retention.

[0013] According to the present invention, the ball base is made of two hemispherical hollow bodies molded by injection molding. Since it is formed by bonding, the ball base can be manufactured in a short time and without the need for manual labor. This makes it possible to create balls with a conventional thread-wound structure, as well as rotary molding. Compared to the ball base manufacturing method, manufacturing costs can be significantly reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view of an embodiment of the present invention.

[Explanation of symbols]

1,2 Hemispherical hollow body 3 valve 4 Ball base 5 Leather panel 6 Narrow groove 7 Mushi rubber

──────────────────────────────────────────────── ─── Continued from the front page (51) Int.Cl. ⁵ Identification code Internal reference number FI Technical display location B29L 31:34 4F (72) Creator Kei Okimoto 1-8 Yokogawa Shinmachi, Nishi-ku, Hiroshima Molten Co., Ltd. Inside

Claims (1)

[Scope of utility model registration request] Claim 1: A thermoplastic elastomer material is formed into two hemispherical hollow bodies by an injection molding method, and the hemispherical hollow bodies are joined to form a spherical hollow body. The ball base is composed of a ball base in which compressed air is sealed through an air injection valve provided at an appropriate location, and a plurality of leather panels adhered to the surface of the ball base with an adhesive. A ball for a ball game, characterized in that the thermoplastic elastomer material has a 10% elongation stress in the range of 30 to 190 kg/cm ² .