Patent ID: 6838036
Filing Date: 2005-01-04
Classification: A63B,B29C,B29K,B29L,Y10S

Abstract:
1. A method for manufacturing a golf ball comprising the steps of; a preforming step to form a preforming material which is substantially cylindrically shaped and is made of a rubber composition; a placing step to place the preforming material in a mold comprising an upper portion and a lower portion both of which have a hemispherical cavity; a clamping step wherein the lower portion is mated to the upper portion; an unclamping step wherein after mating of the upper and lower portions for more than or equal to 15 seconds during the clamping step, the lower portion moves relatively apart from the upper portion so that a clearance between the upper and lower portions becomes from 3 mm to 8 mm; a crosslinking step wherein the lower portion is again mated to the upper portion so that a crosslinking reaction initiates; and, a removing step wherein the mold is opened to remove a sphere from the cavity.