| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a resin ball of by which the delamination between a core ball and a shell ball is prevented and a repulsive force can be kept even though shock at the time of hitting the ball is repeatedly imparted to the ball in a long period of time and a method for manufacturing it. <P>SOLUTION: In the two-layer structure resin ball 1 constituted of the resin core ball 2 formed in a substantial ball shape and the resin outer shell ball 3 formed covering the surface of the core ball 2, the core ball 2 is in the condition (biasing storing condition) where the core ball 2 is always biased relative to the outer shell ball 3, and the ball is applied to lifelong sports such as ground golf and park golf. <P>COPYRIGHT: (C)2006,JPO&NCIPI |
