| 摘要 |
PURPOSE:To provide a manufacturing method of a blow-molded ribbed article by which the appearance shape is not spoiled, and the rigidity can be efficiently increased. CONSTITUTION:A double parison consisting of a cylindrical parison 5 on the inner side and an outer parison 6 is introduced between forming dies 1, 1. The dies are closed, and the outer parison 6 is pressed at parting lines 3, 3, and the outer parison is molded by blowing, and then, the cylindrical parison 5 on the inner side is blown, and ribs are formed by bringing into contact or welding the outer surface of the cylindrical parison 5 on the inner side with the inner surface of the outer parison 6 which is formed ahead. |
