MOLD FOR MANUFACTURING RUBBER BALL, AND METHOD OF MANUFACTURING RUBBER BALL

摘要

PROBLEM TO BE SOLVED: To reduce necessary quantity of a preform, and shorten necessary time before taking a molded rubber ball from a mold. ;SOLUTION: A ring groove 13c is formed to get in contact with a cavity 13a to be continuous with it around a cavity 13a of a bottom force 13 facing a top force 12. As the top force 12 and the bottom force 13 are tightened for compression molding, rubber composition supplied to the cavity 13a to form a preform Z is also filled in the ring groove 13c, thereby spew is formed to be connected to a rubber ball.;COPYRIGHT: (C)2001,JPO