Patent ID: 11958230
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, the manufacturing method comprising:
an injection molding process of injection-molding a resin preform including a neck portion and a body portion;
a temperature adjustment process of temperature-adjusting the injection-molded preform while cooling the injection-molded preform; and
a blow molding process of blow-molding the temperature-adjusted preform to manufacture the resin container,
wherein in the injection molding process,
a step portion thicker than at least an engagement groove of the neck portion is formed between the neck portion and the body portion of the preform, an outer diameter of the step portion being larger than at least an outer diameter of the engagement groove of the neck portion,

wherein in the blow molding process,
the preform is blow-molded such that at least a part of the step portion remains between a neck portion and a shoulder portion of a container blow-molded based on the preform, and

wherein the step portion formed between the neck portion and the body portion of the preform has an upper step portion formed between a neck mold and a core mold, and a lower step portion formed between a cavity mold and the core mold, and an outer diameter of the upper step portion is greater than an outer diameter of the lower step portion.