JPS6033076B2 - Manufacturing method for stuffed game balls - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a padded ball for ball games in which a sponge shoulder or the like is enclosed in order to adjust the weight and bounce of the ball.

As shown in Fig. 1, the conventional manufacturing method for this type of ball game pole is that a spherical inner tube a is first vulcanized and molded, a part of which is cut open to provide a closing part b, and skin waste is removed from the closed part b. A predetermined amount of stuffing material c consisting of foam, sponge shoulders, etc. is stuffed into the inner tube a. After the filling was completed, the opening b was closed with a rubber sheet piece e using adhesive d, and if necessary, the inner tube a was heat-treated in a predetermined mold.

In addition, f' is an internal pressure regulating valve, g is a valve body, h is a reinforcing layer such as a thread, i is a rubber layer, i is an adhesive layer, and k is a skin layer.

In addition, as shown in Fig. 2, an inner tube a obtained by molding rubber latex or the like has an internal pressure regulating valve f after stuffing c is stuffed into the inner tube a through a closing part b for attaching an air injection valve. The valve mounting part g was pasted to the opening part b using an adhesive d or the like.

However, in either case of FIG. 1 or FIG. 2, the inner tube a must be vulcanized and molded in advance, and then a portion thereof must be cut open to provide a closing portion b. In addition, when the stuffing material c such as a sponge shoulder is allowed to freely expand, the volume becomes 1.5 to 3 times the internal volume of the inner tube a, so it is quite difficult to insert the stuffing material c through the small-diameter opening b, even by hand. It was inefficient. In addition, it takes a considerable amount of work to close the opening part b with the rubber sheet piece e or the valve mounting part g with the adhesive d after filling the stuffing material c, and if necessary, heating using a mold is necessary. I had to process it.

Further, as described above, since a bonding process is required when closing the entrance part b, an accident in which internal pressure air leaks from this bonded part is likely to occur.

The present invention has been made in order to overcome the drawbacks of the above-mentioned method of manufacturing a padded baseball game ball.

Embodiments of the present invention will be described with reference to FIGS. 3 to 8.

First, as shown in Fig. 3, natural or synthetic leather shoulder 1, high-magnification foamed sponge waste 2, etc. are compressed in an evenly mixed state, and a bag-shaped film 3 made of thermoplastic resin such as polyethylene is compressed. Being foreskinned. The ball-shaped stuffing 4 made in this way is prepared in advance. Next, as shown in FIG. 4, inner tube rubber sheets 6a and 6b are applied to the molds 5 and 5, which are divided into upper and lower halves, respectively, and the stuffing material 4 is sealed in the molds 5 and 5.

Note that a valve mounting portion 6c is formed on the rubber sheet 6a. Then, air is removed from the suction holes 7, 7 of the molds 5, 5, and rubber sheets 6a, 6b are molded by a vacuum forming method using vacuum suction force, and as shown in FIG. A vulcanized inner tube 8 is completed.
After that, the unfinished inner tube 8 was changed to a different pinion shape (
(not shown).

This heating thermally destroys the film 3 of the stuffing 4 inside the inner tube 8, and the compressed skin 1, sponge waste 2, etc. inside expands and fills the inner tube 8 as shown in FIG. . Incidentally, since the amount of the thermally destroyed film 3 itself is small, the influence on rebound properties etc. can be ignored.

Ball rebound adjustment is determined by the type and mixing ratio of the material for the stuffing 4, but in the case of ultra-low bounce balls such as indoor soccer balls, urethane sponge with an apparent specific gravity of approximately 0.03 is used as the material for the stuffing 4. Approximately 40 pieces of natural leather and about 120 pieces of natural leather were mixed and placed in a bag made of polyethylene film 3.

Further, the vulcanized inner tube 8 is coated with a rubber layer 1 on its surface via a reinforcing layer 9 and an adhesive layer 10, as shown in FIG.
1 is attached, and the rubber pole 12 is completed.

Further, as shown in FIG. 8, a skin layer 13 is further pasted on the rubber layer 11' via an adhesive layer 10, thereby completing a grass-covered ball 14. The rebound characteristics of the indoor soccer pole manufactured in this way are that when it is freely dropped from a public height to a concrete surface, the first bounce is about 3 droplets and the second bounce is about 9 arcs, which is similar to that of an indoor soccer ball. Good results were obtained that fully satisfied the specifications.

As mentioned above, the present invention relates to a method for manufacturing a ball game pole in which a padding made of skin, sponge shoulder, etc. is enclosed in a spherical inner tube made of a polymeric material in order to appropriately adjust the weight and bounce of the ball. A stuffing 4 is prepared in advance by compressing a mixture of the skin shoulder 1, the sponge shoulder 2, etc. and surrounding it with a film 3 of thermoplastic resin such as polyethylene, and vacuum forming it in two divided molds 5, 5. The stuffing 4 is sealed in the inner tube 8 which is uncured and molded by the method, and the inner tube is heated and vulcanized in a pinion shape, and the film 3 of the stuffing 4 is thermally destroyed, resulting in a skin shoulder. 1, sponge shoulders 2, etc. are expanded in the inner tube 8 and uniformly dispersed.

According to this invention, in the method of enclosing the filler 4 such as the skin calculus 1 in the inner tube 8, a large amount of the skin layer is removed from the entrance part provided by cutting out a part of the previously molded spherical inner tube. This method has the advantage that the work is more efficient than when manually stuffing the balls, etc., and that the leather shoulders 1, etc. enclosed in the inner tube 8 are evenly distributed, which contributes to performance such as rebound properties of the ball.

Note that this invention can be applied not only to indoor soccer poles but also to a wide variety of balls that require reduced bounce characteristics.

In other words, it is possible to lower the rebound properties of the pasted ball and bring out the characteristics of the sewn ball. It can also be applied to the manufacture of training balls with increased weight without the aim of low bounce by selecting the type and amount of stuffing. Furthermore, the stuffing material is not limited to the one shown in the drawings, but may be made of compressed compressible material such as a lump of sponge.

[Brief explanation of the drawing]

Fig. 1 is a vertically sectioned front view of the figure of a conventional stuffed ball game ball, and Fig. 2 is a modification of the same. 3 to 4 are for explaining an embodiment of the method for manufacturing a stuffed ball game ball of the present invention, and FIG. 3 is a front view of the stuffing;
Fig. 4 is a front view showing the state in which the inner tube is molded with a mold, Fig. 5 is a vertical cut front view of the uncured inner tube, Fig. 6 is a vertical cut front view of the inner tube after vulcanization, and Fig. 6 is a vertical cut front view of the inner tube after vulcanization. FIG. 7 is a vertical cut front view of a stuffed ball game ball, and FIG. 8 is a modification of the same. 1... Leather calendar, 2... Sponge shoulder, 3... Film, 4... Filling, 8... Inner chew. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 8

Claims (1)

[Claims] 1. In a method of manufacturing a ball game ball in which a filling made of skin scraps, sponge scraps, etc. is sealed in a spherical inner tube made of a polymeric material in order to appropriately adjust the weight and rebound properties of the ball, leather scraps and sponge scraps are The inner tube is prepared in advance by compressing a mixture of polyethylene and encasing it with a film of thermoplastic resin such as polyethylene, and then molding the mixture into an unvulcanized mold using a vacuum forming method in a mold that is divided into two parts. The stuffing is sealed inside the inner tube, and then the inner tube is heated and vulcanized in a square shape, and the film of the stuffing is destroyed by heat, so that skin waste, sponge waste, etc. expand in the inner tube and are uniformly dispersed. A method for producing a stuffed ball game ball characterized by: