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

Claim 6:
7. 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;
adjusting a temperature of the preform; and
stretching the preform by pressing a bottom portion of the preform by a stretching rod while introducing blow air into the preform,
wherein during the adjusting of the temperature of the preform, a temperature equalization treatment is performed by shrinking the preform in a longitudinal axis direction thereof,
wherein during the temperature equalization treatment, the preform is deformed in a direction intersecting the longitudinal axis direction, and
wherein the adjusting of the temperature of the preform comprises:
shrinking the preform in the longitudinal axis direction while bending and deforming the preform; and
shrinking the preform in the longitudinal axis direction while relieving the bending and deforming of the preform.