| 摘要 |
PURPOSE:To previously prevent generation of molding defect based on static electricity charged on the surface of a parison by correcting the parison sagged between the split molds to a vertically sagged state with a gripper provided to the lower part of the split molds and closing the split molds and introducing pressurized fluid into the parison. CONSTITUTION:A plurality of grippers 5, 6 are equipped freely movably and regulatively in the position for pinching the lower part of a parison according to the respective cavities 2 in the lower part of the split molds 1. The parisons 4 are extruded from the extrusion heads 3 and sagged between the split molds 1. The lower parts of the sagged parisons 4 are pinched between the grippers 5, 6. Before the split molds 1 are closed, the curves of the parisons 4 are corrected by moving and regulating the grippers 5, 6 and the parisons are rightly regulated to a vertical state. The parisons 4 are held in this state and the split molds 1 are closed. Pressurized fluid such as pressurized air in introduced into the parisons 4 and simultaneously two hollow bodies made of plastic are molded. In such a way, a plurality of pieces of parisons are corrected to the right vertical state and therefore molding defect is not caused even when a plurality of moldings are obtained at once. |
