HOME > Product Introduction > Sporting Goods > The Secret of the Ball The secret of the ball You can see the process of making a softball baseball. 1. First, make the inner ball. A foaming agent is injected inside. (It's like a super bowl) < > * 1 Vulcanization is a chemical reaction that occurs when sulfur is added to raw rubber and heated. Rubber, which looks like clay, changes to be hard and elastic. (Discovered in 1839 by Charles Goodyear) You can see the process of making softball. 1. Cork chips (natural cork grains). < > * 1 Vulcanization is a chemical reaction that occurs when sulfur is added to raw rubber and heated. Rubber, which looks like clay, changes to be hard and elastic. (Discovered in 1839 by Charles Goodyear) You can see the process until the Yu ball is made. 1. It is a material for Yu balls. Prepare a rubber ball at the center, two gourd-shaped synthetic leather sheets on the epidermis, and a sewing thread. < > Product introduction Industrial supplies Sporting goods Product Line The secret of the ball event information Inquiries (sports) Footwear Tire tube head office Yubinbango674-0084 Akashi, Hyogo Prefecture UOZUMI-cho, Nishioka 2050 Address TEL: 078-944-0650 FAX: 078-942-0284 Kobe 〒650-0023 4-1-10 Sakaemachi -dori, Chuo-ku, Kobe 7th floor, Shinwa Building TEL: 078-360-1361 FAX: 078-360-1371 Fukuoka 〒812-0016 Hakataeki Minami 4-9-7, Hakata-ku, Fukuoka City Chateau Izumi 1st floor TEL: 092-472-3885 FAX: 092-472-3862 Tokyo 4-5-15 Shinbashi, Minato-ku, Tokyo 105-0004 Shinbashi Shinwa Building 4th floor TEL: 03-3459-6868 FAX: 03-3459-6869 Nagoya Yubinbango453-0056, Nakamura-ku, Nagoya, Sunada-cho 1-chome No. 40 No. 1 TEL: 052-412-3218 FAX: 052-412-3473 Copyright (C) Naigai Rubber Industry Co., Ltd. All Rights Reserved.