| 摘要 |
A cover method for baseballs or softballs, whereby a spherical core is independently formed and a fiber material layer is attached, this fiber material layer is evenly brushed with a thin layer of PU, and this spherical core is then placed in a mold, and PU is injected into the mold to cover the spherical core and heated, finally the mold is removed to reveal the complete ball. Utilizing this method and mold to produce the ball covers for baseballs and softballs, whereby PU is brushed onto, and penetrates into, the fiber material layer on the independently formed spherical core, so that when the ball cover forms, the ball cover and spherical core attaches and fits firmly, and the porous construction of this fiber material cover attracts air, and therefore greatly avoids bubbles forming when the ball cover is formed which affects the quality and lifespan of the balls.
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