Method and apparatus for manufacturing resin container
AssigneeNissei Asb Machine Co., Ltd.
InventorsTomokazu Komiyama, Atsushi Nagasaki
Life of this patent
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Abstract
A method for manufacturing a resin container includes: injection molding a preform made of a resin and having a body portion and a bottom portion; adjusting a temperature of the preform manufactured in the injection molding; and a blow molding step of blow-molding the preform having the adjusted temperature to manufacture a resin container. In the injection molding, the preform is injection-molded using an injection mold in which a thickness of the bottom portion is 0.7 to 0.85 relative to a thickness of the body portion. Further, in the adjusting the temperature, a coolant is introduced into the preform to cool the bottom portion of the preform.
Claims5
A method for manufacturing a resin container, the method comprising:
- injection-molding a preform made of a resin and having a body portion and a bottom portion;
- adjusting a temperature of the preform manufactured in the injection molding;
- and
- blow-molding the preform having the adjusted temperature to manufacture a resin container,
- wherein the preform is bowl-shaped such that a diameter of a neck portion is set to be longer than a length from the top of the neck portion to the bottom portion,
- in the injection-molding, the preform is injection-molded using an injection mold in which a thickness of the bottom portion is 0.7 to 0.85 relative to a thickness of the body portion,
- in the adjusting the temperature, a coolant is introduced into the preform to cool the bottom portion of the preform,
- a vertical-axis stretching ratio of the preform in the blow-molding is from 3.0 to 7.0,
- the injection mold has a gate region into which a resin material is introduced from an outer side of the bottom portion,
- the gate region is formed in a tapered shape in which a diameter increases toward the bottom portion,
- a corner portion connecting the gate region and an outer surface of the bottom portion is rounded,
- the thickness of the bottom portion is 0.70 to 0.90 relative to the diameter dimension of the distal end side of the gate region, and
- a radius of the corner portion is 1.0 mm or more.
An apparatus for manufacturing a resin container, the apparatus comprising:
- an injection molding unit configured to injection-mold a preform made of a resin and having a body portion and a bottom portion;
- a temperature adjustment unit configured to adjust a temperature of the preform manufactured by the injection molding unit;
- and
- a blow molding unit configured to blow-molds the preform having the adjusted temperature to manufacture a resin container,
- wherein the preform is bowl-shaped such that a diameter of a neck portion is set to be longer than a length from the top of the neck portion to the bottom portion,
- the injection molding unit injection-molds the preform using an injection mold in which a thickness of the bottom portion is 0.7 to 0.85 relative to a thickness of the body portion,
- the temperature adjustment unit introduces a coolant into the preform to cool the bottom portion of the preform,
- a vertical-axis stretching ratio of the preform in the blow-molding is from 3.0 to 7.0,
- the injection mold has a gate region into which a resin material is introduced from an outer side of the bottom portion,
- the gate region is formed in a tapered shape in which a diameter increases toward the bottom portion,
- a corner portion connecting the gate region and an outer surface of the bottom portion is rounded,
- the thickness of the bottom portion is 0.70 to 0.90 relative to the diameter dimension of the distal end side of the gate region, and
- a radius of the corner portion is 1.0 mm or more.
Dependencies are inferred from the claim text.