| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To evade concentrated occurrence of shearing stress at a part of a cover material and to improve the durability of a ball by suppressing the displacement of two core constituting members from each other when the hitting force of a club acts in the case of constituting a core spherical body covered with the cover material by the two core constituting members. <P>SOLUTION: A first core constituting member 6 and a second core constituting member 7 are molded by a mold for molding the core spherical body. While the first core constituting member 6 and the second core constituting member 7 are held in the mold, the first core constituting member 6 is moved and made to face the second core constituting member 7. A cavity for joining is formed around the joining part of the first core constituting member 6 and the second core constituting member 7, and a resin material 23 for joining is made to flow into the cavity for joining. The first core constituting member 6 and the second core constituting member 7 are deposited and integrated by the resin material 23 for joining, and the core spherical body 3 is constituted. On the outer peripheral side of the core spherical body 3, the cover material 4 is integrally formed. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
