Resin container manufacturing method
AssigneeNissei Asb Machine Co., Ltd.
InventorKiyonori Shimada
Life of this patent
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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.
Claims5
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 in a temperature adjustment;
- stretching the preform in a stretch blow molding by pressing a bottom portion of the preform by a stretching rod while introducing blow air into the preform;
- conveying the preform from the injection molding to the temperature adjustment in a first conveying;
- and
- conveying the preform from the temperature adjustment to the stretch blow molding in a second conveying,
- wherein the temperature adjustment includes at least processing of heating the preform from outside,
- wherein during the first conveying, the temperature adjustment, and the second conveying, the temperature adjustment is performed such that a length in a longitudinal axis direction of the preform at the time of being brought into the stretch blow molding is shrunk by at least 8% or more of a length in the longitudinal axis direction of the preform at the time of forming in the injection molding.
Dependencies are inferred from the claim text.