| 摘要 |
PROBLEM TO BE SOLVED: To provide a manufacturing device for a ball for regulation baseball, wherein a core is arranged at the center of the regulation ball in order to prevent the deviation of the gravity center, a first bonded face and a second bonded face are formed in one unit to ensure melting and bonding for higher durability and less labor is required in convenient and efficient manufacture. SOLUTION: The hemisphere portion of a core 1 is covered with a first synthetic resin ball skin 2a which has a bonded portion 4 on the first bonded face 3a for increasing a bonding area with small heat capacity, the bonded portion 4 is melted by the heat of the molten resin for covering the remaining hemisphere portion to form a second ball skin 2b to be melted and bonded to the first ball skin 2a and the periphery of the core 1 is covered with the ball skin 2. |
