| 摘要 |
PURPOSE:To manufacture a hollow ball, made of vinyl chloride and applied with two-color coloring on the surface thereof. CONSTITUTION:Two sets of same rotary molding forms 10, 11, 20, 21 are employed to mold two-color ball surface layers A, B by respective rotary molding forms 10, 11, 20, 21, then, the combination of top force and bottom force for respective rotary molds are changed together with the surface layers A, B to manufacture ball main bodies C integrally with the insides of the surface layers A, B through rotary molding. |
