Golf ball mold and golf ball
AssigneeBridgestone Sports Co., Ltd.
InventorsHisashi Yamagishi, Yutaka Masutani, Takashi Maruko, Atsushi Nakamura
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Abstract
In connection with a golf ball comprising a core, an intermediate resin layer, and a cover, the invention provides a mold having a cavity wall defining a spherical cavity, wherein the core is placed in the cavity to define a space for molding the resin layer. The cavity wall is provided with a plurality of radially extending projections, the total cross-sectional area of the projections relative to the cavity wall and the total volume of the projections relative to the space volume are properly controlled.
Claims9
In connection with a golf ball comprising a core, a resin layer enclosing the core, and a cover enclosing the resin layer,
- a mold composed of a pair of an upper mold half and a lower mold half and having a cavity wall defining a spherical cavity, the core being placed in the cavity to define a space for molding the resin layer, wherein
- the cavity wall formed of the upper mold half and lower mold half is provided with a plurality of projections extending radially toward the geometric center of the cavity so as to precisely place the core at the center of the cavity and to be not off-centered during injection by the pressure of the injected resin compound,
- the total of the cross-sectional areas of the projections at their base divided by the surface area of the cavity wall is up to 2%, and
- the total of the volumes of the projections divided by the volume of the space is up to 4%.
Dependencies are inferred from the claim text.