| 摘要 |
PURPOSE:To make it possible to remove positively a molded item from split mold main parts without forming a mark due to a knock pin onto the molded item, by providing, outside of a pair of split molds, an extendable air pin for blowing air into a parison clamped between the pair of split molds. CONSTITUTION:A cylinder 50 has an air pin 52 with a through-hole in the axial direction that is fixed to one surface of its piston 51. When air supplied to the cylinder is released after the molding, the air pin 52 is retracted to its original position by the action of a spring 55, then when split mold main parts are opened to the right and left by driving hydraulic cylinder 10, 10 of the molding machine, the molded item with the upper parts and lower parts and opposite parts of the molded item clamped by split mold upper parts 3, 3 and lower parts 4, 4 the split mold main parts will be taken out positively from the main part half surfaces 5, 5 of the split mold main parts 2, 2. Then when movable arms 22, 22 are retracted by driving a core cylinder 32, the split mold upper parts 3, 3 and the lower parts 4, 4 with the molded item clamped by the upper and lower parts and the opposite parts thereof is retracted to the next retraction position (Y). While the molded item is retracted, the molded item is torn off an extrusion die 41. |
