Method of manufacturing a golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsMichio Inoue, Keisuke Ihara
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Abstract
A golf ball has a core and a cover, and the cover includes at least one thin spherical layer with a thickness of not more than 1.5 mm. The thin layer is molded by injecting an injection molding material at a selected fill speed which is correlated to the melt flow rate of the molding material. The invention facilitates the mass production of golf balls having thin spherical cover layers of uniform thickness which offer potential for further improvements in ball performance.
Claims2
A method of manufacturing a golf ball having a core and a cover enclosing the core, the cover having at least one thin spherical layer with a uniform thickness of not more than 1.5 mm,
- said method comprising the step of injection molding a molding material uniformly around said core to cover said core with molding material satisfying formula (1):
- V≧(a/t2)−b (1)
- wherein V is an injection molding material fill speed in cubic centimeters per second, t is a thickness of said at least one thin spherical layer in millimeters, a=0.04M2−3.75M+137.5, and b=−1.49/M−0.57, and M is a melt flow rate in grams per 10 minutes at 190° C. of said injection molding material for said at least one thin spherical layer.
Dependencies are inferred from the claim text.