| CPC A63B 37/00622 (2020.08) [A63B 37/0011 (2013.01); A63B 37/0023 (2013.01)] | 4 Claims |
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1. A method for manufacturing a golf ball comprising a core and a cover, wherein the core has a core body made of a first polybutadiene rubber and having a surface with a plurality of grooves or holes thereon, which grooves or holes are filled with a second polybutadiene rubber of a differing composition from the first polybutadiene rubber, and wherein the polybutadiene rubber-filled groove portions or hole portions have a higher surface hardness than the core body, comprising the steps of:
producing a core body that is made of a first polybutadiene rubber and has a surface with a plurality of grooves or holes thereon;
filling the grooves or holes formed at the surface of the core body with a second polybutadiene rubber having a higher hardness than the surface hardness of the core body so as to produce a core having a smooth spherical surface; and
forming a cover around the core, either directly on the core or over an intervening intermediate layer.
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