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Golf ball and method of making same
| Details |
Inventors: Shimosaka, Hirotaka; Ihara, Keisuke; Masutani, Yutaka; Inoue, Michio; Kasasima, Atuki;
Assignee: Bridgestone Sports Co., Ltd (Tokyo, JP)
Primary Examiner: Marlo; George J.
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
A golf ball has a core (1) enclosed with a cover (2) wherein the cover (2) is embossed on its surface with dimples by compression molding in a mold and includes an innermost layer (3), an intermediate layer (4), and an outermost layer (5). The intermediate layer (4) and the outermost layer (5) are formed of a laminate film while the outermost layer (5) is made of a material which is smoothly releasable from the mold. The golf ball is readily removed from the mold at the end of molding and has a high precision of dimple geometry. |
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DETAILED DESCRIPTION Therefore, an object of the present invention is to provide a golf ball featuring smooth mold release, high productivity, and precise dimple geometry.
Another object of the present invention is to provide a method which ensures efficient preparation of such golf balls.
The present invention is directed to the preparation of a golf ball by enclosing a core with a multi-layer cover including an innermost layer, an intermediate layer, and an outermost layer while embossing the cover with dimples by compression molding in a mold.
According to the invention, a core having the cover innermost layer formed thereon is wrapped with a laminate film including a resin layer to form the cover intermediate layer and another resin layer to form the cover outermost layer, and the wrapped core is placed in a negative dimple pattern-bearing mold and thermocompression molded therein for thereby constructing the cover including the innermost, intermediate and outermost layers around the core while embossing dimples in the cover surface.
Desirably, the other resin layer of the laminate film to form the cover outermost layer is made of a material having mold release characteristics such as an ethylene-vinyl acetate copolymer, polyurethane, and polyethylene in consideration of mold release after thermocompression molding, and the cover innermost layer and intermediate layer are constructed of an ionomer resin base material which is a suitable cover stock.
This process prevents the dimple geometry precision from being degraded due to ineffective mold release after molding and ensures efficient manufacture of golf balls having a cover of better performance.
More particularly, since the golf ball of the invention is characterized in that the intermediate and outermost layers of the cover are formed by thermocompression molding and that in embossing dimples in the cover surface, the outer layer of the laminate film in contact with the negative dimple pattern-bearing cavity surface of the mold is constructed of a material having release characteristics, a ball as molded can be removed from the mold without reducing dimple precision
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