JPH0647109A - Physical exercise ball - Google Patents

Abstract

PURPOSE:To provide a manufacturing method of a physical exercise ball composed of a soft leather ball having an impact value lower than a conventional yarn winding ball or a sticking ball such as a soft volleyball of not causing thickening, deformation and so on. CONSTITUTION:In a manufacturing method of a physical exercise ball having a winding yarn reinforcing layer on a rubber spherical tube, the winding yarn reinforcing layer formed on the rubber spherical tube is formed by winding covered yarn where a filament such as nylon is wound round core yarn composed of urethane elastic yarn.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sports ball having a thread winding reinforcing layer on a rubber tube.

[0002]

2. Description of the Related Art Conventionally, a softball ball, which is made of a single layer of rubber and is highly elastic, has been popular as a leisure sport for all age groups regardless of age and sex. The ball has no reinforcement,
If it is used for several hours, it will be deformed or enlarged, and if the air pressure is 0.1 kg / cm ² or more, it will swell abnormally.
When placed in a storage basket or the like and stacked in a plurality of layers, there is a problem that the balls in the lower layer are subjected to heavy pressure and are deformed or damaged, resulting in lack of durability.

Conventionally, pasted balls have been manufactured as follows. That is, 50 to 50
A 200D polyester or nylon filament wound endlessly on 3,000 to 4,000 m is wrapped with a cover rubber and vulcanized in a mold of 150 to 180 degrees to obtain a so-called carcass. that time,
If the panel shape and the grain are stamped on the mold in advance,
The obtained carcass becomes a rubber ball as it is,
Apply chloroprene adhesive to the carcass
A leather ball is obtained by pasting a surface material such as artificial leather. Although this pasted ball is excellent in durability, it has a problem that it is hard, it hurts when hitting a hand, an arm, etc., and it is inferior to a sewing ball in terms of feel.

In order to improve the above problems, for example, as described in JP-A-55-103877, a nylon spherical filament surface and a nylon elastic filament are randomly mixed and wound on the surface of a rubber spherical tube. There is a type that absorbs impact by forming a wound layer, but the urethane elastic yarn, which has a particularly large impact absorbing effect, occupies only a small proportion of the whole yarn, and it has the same elasticity as the cover rubber. Since it is a body, it actually shows only the effect of slightly increasing the amount of the cover rubber, and the satisfactory effect of reducing the impact value cannot be obtained. Further, as another example, Japanese Patent Laid-Open No.
No. 6-15769, the urethane elastic yarn of the invention is replaced with a rubber yarn, and twisted and wound at the same time as nylon (or nylon crimped yarn),
Although a wound layer is formed, the effect is almost the same as that of the above invention, and the expected impact value reducing effect is not obtained. The nylon crimped yarn is obtained by twisting, heat fixing, and untwisting a nylon filament to give a twisting strain, or a compressive force is applied in the fiber axial direction of the nylon filament to cause buckling, By fixing it with heat, a zigzag crimp is given and spring-like elasticity is given.However, when a strong tension is applied during manufacturing or use, twist strain or crimp is stretched and spring-like elasticity is obtained. It is also known that the behavior of the nylon filament itself is lost and that the expected impact value reduction (soft) effect is not always exhibited.

[0005]

The problem to be solved is that the conventional soft volleyball has no reinforcing property and is deformed or enlarged when used for several hours, and the air pressure is reduced to 0.
If it is 1 kg / cm ² or more, it may swell abnormally.

Among conventional pasted balls, a leather ball is hard and hurts when hitting a hand, an arm, etc., and is inferior to a sewn ball in terms of feel.

[0007]

SUMMARY OF THE INVENTION A first aspect of the present invention is a motion which comprises forming a thread-wound reinforcing layer on a spherical rubber tube and molding and vulcanizing a cover rubber on the reinforcing layer to form a carcass. A method of manufacturing a ball for use, wherein a thread winding reinforcing layer formed on the rubber spherical tube is formed by winding a covered yarn in which a filament such as nylon is wound around a core thread made of urethane elastic thread. .

A second aspect of the present invention is a method of manufacturing an exercise ball, which comprises forming a thread-wound reinforcing layer on a rubber spherical tube and applying an outer skin on the reinforcing layer with an adhesive. The thread winding reinforcing layer formed on the rubber spherical tube is formed by winding a covered yarn in which a filament such as nylon is wound around a core thread made of urethane elastic thread.

A third aspect of the present invention is to form a wound winding reinforcing layer on a rubber spherical tube, mold and vulcanize a cover rubber on the reinforcing layer to form a carcass, and apply an adhesive on the carcass. A method for manufacturing an exercise ball, which comprises applying a skin to the surface of the rubber spherical tube, the wound yarn reinforcing layer being formed on the rubber spherical tube, wherein a core yarn made of urethane elastic yarn is wound with a filament such as nylon. Is formed by winding.

[0010]

EXAMPLE An example of the first invention will be described. A covered yarn described below is wound around a rubber spherical tube to form a thread winding reinforcing layer, and then wrapped with a cover rubber. The ball thus obtained is a so-called soft-valley rubber ball.

The cavern yarn is made of urethane elastic yarn (spandex) or the like as the core yarn, and other spun paper or filaments of nylon, polyester or the like wound around several hundred to one thousand times / m. However, as the core yarn, a urethane elastic yarn of 10 to 560D (trade name "Operon": DuPont) is usually used.

An embodiment of the second invention will be described.
A so-called leather ball is formed by winding the covered yarn around a rubber spherical tube, forming a thread-wound reinforcing layer, applying a chloroprene-based adhesive, and attaching a surface material such as natural leather or artificial leather.

Explaining an embodiment of the third invention,
The covered yarn is wound around a spherical rubber tube to form a wound-fiber reinforcing layer, which is then wrapped with cover rubber and vulcanized in a mold at 150 to 180 ° C. to produce a carcass. A so-called leather ball is obtained by applying a chloroprene-based adhesive to the obtained carcass and attaching a surface material such as natural leather or artificial leather to it.

Explaining the operation, the urethane elastic yarn has 4 to 5 times the strength of a rubber yarn of the same thickness and has an elongation of 500 to 600%. From this, the covered yarn has elasticity based on the spring effect of the core yarn (urethane elastic yarn) and the winding yarn (nylon filament), strength based on the core yarn in the elastic region, and high strength based on the winding yarn outside the elastic region. Has three-sided strength. Therefore, in the winding process like the above-mentioned processed yarn, it is possible to overcome the tension due to the frictional resistance at the several guides and the sizing portion of the yarn existing in the path from the bobbin to the wound tube. , Is wound in an elastic state. Further, in this state, the nylon filaments wound around the urethane elastic yarn as the core yarn are interlaced with each other on the surface of the spherical tube, and are intricately entangled in a state where the winding is not released.

Since the wound layer of the spherical tube wound with the covered yarn is fixed in a state where the nylon filaments are intricately entwined with each other, unlike the wound layer of the ordinary nylon filament, the wound layer of the core yarn and the wound yarn is different. It has a proper elasticity due to the spring effect and a proper reinforcing property with a wound yarn fixed in a complicatedly entangled state, that is, a nylon filament. Therefore, the carcass (rubber ball) produced as described above and the leather ball on which the chloroprene adhesive is applied and the natural leather or the artificial leather is attached have appropriate softness and reinforcement. Also, apply the adhesive directly to the wound layer,
What is directly laminated with natural leather or artificial leather has substantially the same characteristics.

FIG. 1 schematically shows the elongation and tensile strength of nylon filament, nylon processed yarn, nylon covered yarn, spandex, and the following can be seen. Nylon filament has almost no elongation and high strength. Nylon processed yarn has a narrow elastic region,
Moreover, the tensile strength in the elastic region is small. This is because the elasticity of the processed yarn depends only on the spring effect due to the processing strain of the yarn. Further, the nylon processed yarn has the same high strength as the nylon filament when it goes out of the elastic region. As described above, the nylon covered yarn has a wide elastic region and has an appropriate tensile strength in that region.
Spandex is elastic but not as strong as nylon filament.

Table 1 shows the manufacturing conditions of the balls of the first invention and the comparative example. In order to make the comparison conditions the same, the amount of nylon filament used was the same. Therefore, the winding time and the number of windings are adjusted. The total amount of spandex only was the same. The carcass and the total weight were made the same as much as possible.

[0018]

[Table 1]

From FIG. 2, the impact value (the impact value of the carcass when dropped from a height of 1 m) for the soft valley hall according to the first invention and the conventional and comparative examples.
By comparing and considering, it can be arranged as follows.
That is, the impact value of the conventional example is the lowest, but since it has no reinforcing property, it is bloated at an air pressure of 0.1 kg / cm ² or more, cannot be measured, and has an unsuitable size as a soft volleyball. Next, Comparative Example (1) is the softest next to the conventional example, but has no reinforcement as in the conventional example, and is 0.1 k
If it is more than g / cm ^2, it will be enlarged. In Comparative Example (2), the impact value drastically drops at a pressure of around 0.1 kg / cm ² , and is close to the impact value when the covered yarn is used. This is because the ball is not elastically deformed normally at the time of collision but is bent and plastically deformed.
It can also be confirmed from the fact that the collision sound changes from the normal sound (pompon) to the sound (pomp) at the boundary of m ² . In such a state, appropriate impact resilience as a ball cannot be obtained. Further, when the air pressure is 0.3 kg / cm ² or more, the impact value is high, and it is hard and painful (the athlete's evaluation is also the same, and it is unsuitable). The impact value of Comparative Example (3) is substantially the same as that of Comparative Example (2). Finally, the impact values of Examples (1) and (2) are higher than those of the conventional example and the comparative example (1), but the impact values are not a hindrance to the athlete, and they are reliable as the fluffy of the conventional example. It feels better than it does not feel, and is 0.3kg / c, which is the pneumatic range that is actually used.
When m ² or less, softness is maintained, which is preferable.

From FIG. 3, the relationship between the ball pressure and the ball size of the soft valley hole according to the first invention and the conventional and comparative examples can be compared and considered as follows. That is, since the conventional example has no reinforcing material, the ball is abnormally enlarged and deformed at an air pressure of 0.1 kg / cm ² or more. Recommended pressure for actual use without bloating 0.025-0.05kg / cm ²
Is an extremely small value, which is practically difficult to control. Next, the comparative example (1) spandex has the same strength as rubber, has no reinforcing effect, and is similar to the conventional example. Three
Secondly, in Comparative Example (2), the nylon filament has sufficient strength as a reinforcing material and there is no problem of enlargement, but it is a problem that it becomes hard. Further, Comparative Example (3) acts only as a nylon filament and is equivalent to Comparative Example (3). Finally, in Examples (1) and (2), the practical pressure was 0.02.
At 5 to 0.2 kg / cm ² , extreme enlargement does not occur and it can be easily controlled. In addition, regarding the change over time in ball size, the conventional method is 0.05 kg / c.
At m ² of 0.07 kg / cm ² , the standard is out of the standard when left to stand, whereas none of the examples is out of the standard, and when left to stand, the size becomes slightly smaller due to the spring action of the covered yarn.

Table 2 shows the manufacturing conditions of the balls of the second and third inventions and the comparative example. In order to make the comparison conditions the same, the amount of nylon filament used was the same. Therefore, the winding time and the number of windings are adjusted. The total amount of spandex only was the same. The carcass and the total weight were made the same as much as possible.

[0022]

[Table 2]

From FIG. 4, a carcass of No. 4 size volleyball (artificial leather) according to the second and third inventions and a conventional example.
When the impact value (the impact value of the carcass when dropped from a height of 1 m) is compared and compared with that of the comparative example, it can be arranged as follows. The shock value increases in proportion to the pressure. There is no great difference between the conventional bobbin winding (1) that does not include the spandex and the processed yarn and the conventional bobbin winding (2) that includes the same nylon filament and the spandex and the processed yarn. These impact values are pressure 0.15kg / c
rapidly drops to a boundary around m ^2, which is close to the impact value of the covered yarn used. This is because the conventional yarns (1) and (2) show a bent-like plastic deformation behavior at a pressure of 0.15 kg / cm ² or less, not elastic deformation at the time of collision. This can also be confirmed from the fact that the collision sound changes from a normal sound (pompon) to a buzzing sound at the boundary of 0.15 kg / cm ² . It is clear that in such a state, appropriate impact resilience as a ball cannot be obtained. Therefore, it is unsuitable as a ball game to use air with excess air to reduce the pain when children hit the ball. In the case of using the covered yarn, the impact value is smaller than that of the conventional bobbins (1) and (2), and the value is 0.
At 45 kg / cm ² , it is 73 to 87%, and this difference is noticeable to the athlete. In the embodiment using the covered yarn, the pressure is 0.15 kg.
Even if it is less than / cm ² , the impact value does not drop sharply, and the deformation at the time of collision does not impair the elastic deformation. Therefore, even under these low pressures, an appropriate impact resilience as a ball is maintained. The one with only spandex wound has the lowest impact value, but at an air pressure of 0.1 kg / cm ² , it has an abnormally large size and cannot be measured because it has no reinforcing property. (This bloat can be suppressed slightly by attaching artificial leather)

Further, referring to FIG. 5, the impact values (carcasses when dropped from a height of 1 m) for No. 4 size volleyballs (artificial leather) according to the second and third inventions and the conventional example and the comparative example are shown. By comparing and considering the impact value of, it can be arranged as follows. As in the case of the carcass, the impact value increases in proportion to the air pressure. The impact value increases in proportion to the weight increase due to the attached artificial leather, but the magnitude relationship of the impact values according to the examples remains unchanged. The impact value of the embodiment using the covered yarn was 0.48 kg / cm ² at a pressure of 84 to 8 of the conventional bobbin.
This is 7%, and this difference is noticeable. There is no longer a sudden drop in the impact value of the conventional bobbin at low pressure. The impact value is the lowest when only the operon is used, but since it does not have the reinforcing property of nylon filaments and the like, if it is 0.2 kg / cm ² or more, it will be bloated and unsuitable as a ball.

[0025]

Since the present invention is constructed as described above,
Soft volleyball according to the first invention has a practical pressure of 0.02
At 5 to 0.2 kg / cm ² , extreme enlargement does not occur, pressure control is easy, and the size does not deviate from the standard over time, and if left unattended, the spring effect of the covered yarn causes a slight change. Get smaller.

The impact value of the leather balls according to the second and third aspects of the invention is 84 to 87% of that of the conventional bobbin at a pressure of 0.45 kg / cm ² , and the softening is noticeable to the athlete. .

[Brief description of drawings]

FIG. 1 is a coordinate diagram schematically showing the relationship between elongation and tensile strength of various yarns.

FIG. 2 is a coordinate diagram showing the relationship between air pressure and impact value in a soft volleyball.

FIG. 3 is a coordinate diagram showing the relationship between the air pressure in a soft volleyball and the ball size.

FIG. 4 is a coordinate diagram showing the relationship between the air pressure in the carcass of No. 4 size volleyball (artificial leather) and the impact value.

FIG. 5 is a coordinate diagram showing the relationship between the pressure and the impact value of a No. 4 size volleyball (artificial leather).

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Kei Okimoto 1-8 Yokomachi Shinmachi, Nishi-ku, Hiroshima City Morten Co., Ltd.

Claims (3)

[Claims] 1. A method for manufacturing an athletic ball, which comprises forming a thread-wound reinforcing layer on a rubber spherical tube and molding and vulcanizing a cover rubber on the reinforcing layer to form a carcass. A method for manufacturing an athletic ball, which comprises forming a thread winding reinforcing layer formed on a rubber spherical tube by winding a covered yarn in which a filament such as nylon is wound around a core thread made of urethane elastic thread. 2. A method for manufacturing an exercise ball, which comprises: forming a thread winding reinforcing layer on a rubber spherical tube; and sticking a skin on the reinforcing layer via an adhesive. A method for manufacturing an athletic ball, comprising a wound yarn reinforcing layer formed on a spherical tube, which is formed by winding a covered yarn in which a filament such as nylon is wound around a core yarn made of urethane elastic yarn. 3. A thread winding reinforcing layer is formed on a rubber spherical tube, a cover rubber is molded and vulcanized on the reinforcing layer to form a carcass, and an epidermis is stuck on the carcass via an adhesive. A method of manufacturing an athletic ball, which comprises forming a thread winding reinforcing layer on the spherical tube made of rubber, by winding a covered yarn obtained by winding a filament such as nylon around a core thread made of urethane elastic thread. A method for manufacturing an athletic ball formed.