Resin-made container, resin-made container manufacturing method, resin-made container manufacturing apparatus, and mold

A resin-made container manufactured by a stretch blow molding method, comprising:

• a neck portion having an inlet-outlet portion for contents;
• a lateral surface portion connected to the neck portion;
• and
• a bottom portion disposed on an opposite side to the neck portion and connected to the lateral surface portion,
• wherein the bottom portion is formed with a cut remaining portion, which is left after a bulge portion protruding vertically downward is cut,
• wherein the cut remaining portion is positioned in an eccentric region of the bottom portion, the eccentric region being out of a region perpendicularly projected from an opening plane of the inlet-outlet portion of the neck portion.

A resin-made container manufacturing apparatus comprising:

• a clamping mechanism provided independently of a bottom mold of a mold for blow molding, the clamping mechanism being capable of clamping a protrusion provided in a bottom portion of a preform accommodated in the mold for blow molding in a state where split molds included in the mold for blow molding are opened, the protrusion being provided independently of a gate portion;
• a moving mechanism configured to move the clamping mechanism such that, in a state where a neck portion of the preform is held, the protrusion is positioned in an outer region of the bottom portion, the outer region being out of a region perpendicularly projected from an opening plane of an inlet-outlet portion of the neck portion;
• and
• a stretch mechanism configured to stretch the preform by a pressurizing medium after the split molds are closed.

A resin-made container manufacturing method comprising:

• a clamping process of clamping a protrusion provided in a bottom portion of a preform accommodated in a mold for blow molding by a clamping mechanism in a state where split molds included in the mold for blow molding are opened, the protrusion being provided independently of a gate portion, the clamping mechanism being provided independently of a bottom mold included in the mold for blow molding;
• a bending process of bending the preform by moving the protrusion to an outer region of the bottom portion in a state where a neck portion of the preform is held, the outer region being out of a region perpendicularly projected from an opening plane of an inlet-outlet portion of the neck portion;
• and
• a blow process of closing the split molds to stretch the preform by a pressurizing medium.