Resin container manufacturing method
AssigneeNissei Asb Machine Co., Ltd.
InventorKiyonori Shimada
Life of this patent
Estimating the term…
Abstract
The present application includes an injection molding step and a stretch blow molding step. The stretch blow molding step is configured to include: a first step in which preliminary blow air is introduced into a preform to stretch the preform in a state in which a stretching rod does not contact the bottom of the preform; a second step which is executed after the first step, and in which the preliminary blow air is introduced into the preform and the stretching rod is moved at a set speed and pressed against the bottom of the preform to stretch the preform; and a third step which is executed after the second step, and in which final blow air is introduced into the preform to stretch the preform.
Claims8
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.
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.
Dependencies are inferred from the claim text.