Thermoplastic ball core

Details Thermoplastic ball core Thermoplastic ball core

B - Operations, Transporting

29

C

18/660

B29C 44/04 (2006.01) A63B 37/06 (2006.01)

Patent

CA 1088713

THERMOPLASTIC BALL CORE ABSTRACT A method of forming a ball core is disclosed. A flowable homogeneous mass of a thermoplastic resin and a blow- ing agent is injected into the spherical cavity of a mold under temperature and pressure conditions sufficient to activate the blowing agent. The mold is cooled to 32°F to 65°F so as to form askin on the surface of the mass. The mass is held within the mold cavity for a sufficient time so that the skin has adequate strength to prevent its rupture by lowing agent contained within the mass, upon removal of the mass from the mold cavity. The mass is sealed at an exterior temperature of 32° to 65°F. A ball core for baseballs and softballs is also disclosed.

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