Preparation of spherical body

摘要

A spherical body having at least a surface portion made of a thermoplastic resin, typically golf ball is prepared by molding the resin in a split mold consisting of a pair of mold halves. The spherical body as molded has a ring-shaped fin on its surface along the parting line between the mold halves. The fin is removed from the spherical body surface by means of a ultrasonic cutter. The method can remove only the fin at the parting line while minimizing any damage to the proximity of the fin and resurfacing the deburred area as smooth as possible. The method is suited for the manufacture of golf balls and golf ball cores.