Title:
ゴルフボール及びその製造方法
Document Type and Number:
Japanese Patent JP6613651
Kind Code:
B2
Abstract:
In a golf ball having a core and a cover, the core is formed of a rubber composition, has center and surface portions which are unfoamed regions and has an intermediate portion containing a foamed region. The core is produced by charging the rubber composition, which contains a blowing agent, into a first curing mold and curing under given conditions, then removing the molded rubber material in a semi-cured state from the first mold, transferring the semi-cured material to a second curing mold and curing under given conditions. The foamed region of the core deforms by a certain degree at the time of impact, decreasing the radius of gyration of the ball and enabling a lower spin rate to be achieved. The decrease in resilience due to expansion of the molded material can be held to a minimum.
Inventors:
Nakajima Reishi
Application Number:
JP2015125323A
Publication Date:
December 04, 2019
Filing Date:
June 23, 2015
Export Citation:
Assignee:
Bridgestone Sports Co., Ltd.
International Classes:
A63B37/00; A63B45/00
Domestic Patent References:
| JP2005111246A | ||||
| JP11319151A | ||||
| JP56500122A | ||||
| JP48020024B1 |
Foreign References:
| US20150111666 |
Attorney, Agent or Firm:
Takashi Kojima
Saori Shigematsu
Katsunari Kobayashi
Takeshi Ishikawa
Katsuhiko Masaki
Saori Shigematsu
Katsunari Kobayashi
Takeshi Ishikawa
Katsuhiko Masaki