| 摘要 |
PURPOSE:To obtain the titled apparatus by which parison can be molded into a shape adapted for the shape of the aimed item, can prevent even the thickness of the wall of a complicated item from being deviated, and can make the item light in weight, by setting the length, numbers and steps of arms so as to corresponding to the molded item. CONSTITUTION:With the arms 10a, 10b, 10c folded in slits 9a, 9b, 9c of an arm shaft 7, the arm shaft 7 is lowered with a cam bar 16 at the same speed as that of the extrusion of a parison 16. When the cam section 15 of the cam bar 16 engages with a projection 13 of the arm of the arm shaft 7, the arms are radially expanded, and the support plates 14 at the tips of the arms that are coated with a Teflon coating come in touch with the inner surface of the parison to give it a certain tension. |
