Patent ID: 11958229
Assignee: NISSEI ASB MACHINE CO., LTD.
Field: Other special machines (Mechanical engineering)
Classification: CPC B | IPC B

Claim 0:
1. A manufacturing method for manufacturing a resin container made of polyethylene using an injection stretch blow molding method, the manufacturing method comprising:
forming a bottomed preform by injection molding; and
stretching the preform by pressing a bottom portion of the preform by a stretching rod while introducing blow air into the preform,
wherein the stretching of the preform comprises:
stretching the preform by introducing preliminary blow air which has a pressure lower than final blow air into the preform in a state where the stretching rod is not in contact with the bottom portion of the preform;
stretching the preform by moving the stretching rod at a predetermined set speed and pressing the bottom portion of the preform by the stretching rod while introducing the preliminary blow air into the preform, the stretching of the preform by moving of the stretching rod being performed after the stretching of the preform by introduction of the preliminary blow air; and
stretching the preform by introducing the final blow air into the preform, the stretching of the preform by introduction of the final blow air being performed after the stretching of the preform by moving of the stretching rod.