JPS587272A - Plastic ball for baseball - 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 an integrally molded plastic ball for hardball baseball.

Traditionally, baseball has been popular in Japan, and hardball baseball such as high school baseball, adult baseball, and professional baseball are actively played and attract large numbers of spectators.

In particular, high school baseball excites people all over Japan through its spring and summer tournaments, but hardball baseballs are expensive and have a short lifespan, so a large amount of money is required for practice, which is a problem for baseball clubs. It becomes.

The weight of a hardball baseball ball is 1487, and the circumference of the ball is 23.
crn, but its structure has a diameter of 2 in the center.
The outside of a cork ball core made of 1.5+mm cork grains hardened with resin is covered with rubber to form a core with a diameter of 34 mm.The outside of this core is made with wool, and the outside is made with cotton thread to the size of a ball. It is wrapped in the epidermis of the skin, but the seams of the skin are sewn with thread, making the manufacturing process very complicated and time-consuming, making it expensive. Furthermore, if you use this hardball ball for batting, it will become deformed after 100 hits, the outer skin will tear and become unusable, and if it gets wet, it will absorb water and become heavy or swell, making it unusable. there were.

Apart from official matches, this loss is very large in practice.
Since this is an economic burden, the present invention has excellent impact resistance and abrasion resistance, and does not absorb water and can withstand long-term use.

Moreover, it provides a hardball baseball at a low price.

The hardball baseball ball of the present invention has a one-heath hole made of polyurethane, and the plastic ball for hardball has a polyol, an isocyanate, a catalyst,
A predetermined amount of a compound consisting of a foaming agent and a coloring agent (to produce a color similar to that of a real ball) is injected and foamed, and after foaming for a predetermined period of time, the specific gravity of the ball is 0.5 to 0.9. /cr
Within the range of tl, the desired ball is obtained by setting the foam pound distribution and foaming time so that the foam density gradually increases from the center of the ball toward the outer shell (outward from the center of the ball). . At this time, the surface of the ball is integrally provided with unevenness in a seam pattern, and the surface is given a rough finish to provide the same feel when held in the hand as a leather ball.

Next, an example of the method for manufacturing a plastic ball for hardball baseball of the present invention will be shown.

Example 1 Diol 4j 3CIOC1' (RF-3200),
25 parts by weight Tryol #3000 (H
F-319) 75 parts by weight Diol 1,4 Butanediol 1611 Catalyst DMDA
O, 8ll〃 N Methylmorpholine 1.07lll 33LV
O4ll pigment color white
2. Ol1 blowing agent Freon R-111,
Oll Isochanelle Viewer-MDI 80.
1.

The above compound was injected into a mold with the same external shape as an official baseball ball, and after degassing and solidifying for about 10 minutes, the plastic ball taken out from the mold had a specific gravity of 0.74 f/ctIl. An integrally molded urethane ball was obtained.

When the ball is dropped from a height of 2 m onto a 25 mm thick iron plate, the rebound is 57 to 60 crn, and the flight of the ball during batting is also the same distance as the official ball.

Example 2 Diol #3000 (RF-3200)
10 parts by weight Tryol #3000 (HF-319)
90 ll diol 1.4 butadiol
10 parts by weight catalyst DMDA
O,8〃〃 N Methylmorpholine 1,0〃〃 33Lv 0.
4 ll Pigment Color White 2.0/
1. Foaming agent Freon R-111.0 Isocyanate Pure MDI80.111 The above compound 1907 was injected into a ball mold, and after degassing and curing for about 10 minutes, the ball taken out from the mold had a specific gravity of 0. 9t/cA, when the ball is dropped from a height of 2m onto a 25mm thick iron plate, the rebound is 57-6ocrn, and the flight of the ball when batting is also good, and when using this ball, you can apply a lot of force ( Since it is necessary, it becomes a practice for powering up.

Example 3 Diol #3000 (RF-3200) 4
0 parts by weight Tryol #3000 (HF-31
9) 75 Diol 1.4 Butanediol 16 Catalyst DMDA
OT8 Catalyst N-methylmorpholine
1.0 parts by weight〃 33L■ 0
．． 4 Pigment Color White 2. O
[Foaming agent Freon R-111, O] Isocyanate Pure MDI80.11! The above compound 106f was injected into a ball mold, and after degassing and curing for about 10 minutes, the ball taken out from the mold had a specific gravity of 0.5? An integrally molded ball was obtained with /CRD, and when the ball was dropped from a height of 2 m onto a 25 m + thick iron plate, the rebound was 57 to 60 cm,
The flight of the ball during batting is worse than that of the official ball, making it very convenient for use in narrow grounds.

In addition, in all of the above three examples, the density is low in the center of the ball, and the density is higher toward the outer skin, and the outer skin has a surface with appropriate hardness and appropriate elasticity. All balls were durable enough to withstand more than 1,000 batting practices.

As described above, according to the present invention, it is strong and elastic, has extremely excellent impact resistance and abrasion resistance, does not absorb water, and can withstand more than 1000 battings, which is 10 times more than conventional products.
Moreover, you can obtain an extremely excellent practice ball at a low price.

Utility model registration applicant Uchiyama Industries Co., Ltd.

Claims (1)

[Claims] For a baseball sized ball, a predetermined amount of a compound consisting of polyol, isocyanate, catalyst, foaming agent, and colorant is injected into the plastic baseball mold and foamed, so that the specific gravity of the ball is 0.5 to 0.5. 0.9
? / crl, and the ball is molded so that the density gradually increases from the center of the ball toward the outer skin, and a ball-like seam pattern is integrally provided on the surface. A plastic baseball ball with an integrated skin and core material.