METHOD FOR BLOW MOLDING FUEL TANK AND DEVICE USING THIS METHOD

摘要

PROBLEM TO BE SOLVED: To provide a modified device for blow molding which closes holes formed by a blow pin in a molded object and a method using this device. SOLUTION: In this method for blow molding a fuel tank, the blow pin leads to the interior of a parison accommodated inside a blow casting mold and the parison is blow molded inside a molding cavity by a pressurizing gas to be introduced into the parison from the blow pin. The blow pin is made to recede from the casting mold after using the former and a hole formed by the blow pin in the molded object is closed using a pinch plate assembly. The pinch plate assembly can remove cast burrs and later the molded object is unloaded by opening the casting mold. Preferably, the pinch plate assembly has a pair of corresponding plates and the forward edges of the paired plates can be transferred from an "open" position to a "closed" position which are apart from each other. In the "closed" position, the part of the parison or the molded object is pinched/sealed between them. COPYRIGHT: (C)2005,JPO&NCIPI