| 摘要 |
PROBLEM TO BE SOLVED: To provide a method for a producing a ball which can improve a producing process by using a reinforcing layer with an simple structure instead of an conventional reinforcing layer and by using the reinforcing layer with the simple structure as a part of the conventional reinforcing layer. SOLUTION: In the producing method, the reinforcing layer 1 is formed with a sack-shaped body or one or plural kinds of members formed in a semi- finished pipe-shaped body, in the producing process of the ball having a reinforcing layer 1 between a cover X and an inner tube Y. This producing method is formed with the reinforcing layer 1 with a sack-shaped body or one or plural kinds of members formed in a semi-finished pipe-shaped body on an existing reinforcing layer 2.
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