Patent ID: 6416423
Filing Date: 2002-07-09
Classification: A63B,B29C,B29D,B29L

Abstract:
A method for producing a golf ball, the golf ball including a spherical elastic inner layer having a large number of projections with a round shape or a polygonal shape when viewed two-dimensionally on its outer surface, and including a thermoplastic resin outer layer covering the inner layer, the method comprising:providing a mold, comprising an upper mold and a lower mold, with a spherical cavity formed in the inside and with a parting surface provided at a position corresponding to an equator of the spherical cavity, with pole sections of the upper mold and the lower mold each being provided with a plurality of columnar support pins, the support pins elongating into the cavity reciprocally movably, the support pins each having a tip width sufficient for supporting at least two projections on the inner layer; supporting the inner layer at a cavity center portion of the mold with the support pins, from above and below at positions of the projections; and injecting an external layer resin into a space between the inner layer and the cavity wall surface so as to integrally form the inner and outer layers.