Method for preparing a solid golf ball

Details Method for preparing a solid golf ball Method for preparing a solid golf ball

2005-05-17

2005-05-17

Gorden, Raeann (Department: 3711)

Games using tangible projectile

Golf

Ball

C473S378000, C425S116000

Reexamination Certificate

active

06893359

ABSTRACT:
A solid golf ball includes a core formed from a rubber composition and a cover directly covering the core. The cover is formed from a cover material mainly containing a thermoplastic urethane resin by injection molding using a mold composed of upper and lower mold halves. The core has a hardness, expressed by a deflection measured under an applied load of 5 kg to 130 kg, in a range of 2.0 mm or more. The cover has a thickness in a range of 0.9 mm to 1.7 mm. Assuming that a parting plane of the upper and lower mold halves is taken as an equator, each of the upper and lower mold halves has air vent portions in a region within a radius of 10 mm, measured as that projected on the equator plane, from a pole of the mold half. The total length of gaps of the air vent portions formed in the upper and lower mold halves is in a range of 90 mm or more. The width of each of the gaps of the air vent portions is in a range of 0.01 to 0.08 mm. The total area, measured as that projected on the equator plane, of the gaps of the air vent portions formed in the upper and lower mold halves is in a range of 1 to 5 mm2. The solid golf ball exhibits a high resilience and excellent controllability and durability while keeping a soft feel when hit with a putter, and is particularly characterized in that even a thin cover can be stably formed around the core by injection molding,

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patent: 6248028 (2001-06-01), Higuchi et al.
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patent: 02228978 (1990-09-01), None
patent: 07080848 (1995-03-01), None

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