Importance

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Abstract

A blow molding method for molding tube containers by introducing blow air into a parison having been extruded by an extruder is disclosed, which comprises introducing blow air into the parison to shape a tube container and form a discharge outlet in part of the wall of an unnecessary portion of the tube container located lower than the cutting position of the tube container, and further continuing the introduction of blow air. The blow air may be introduced horizontally by piercing the wall of a parison having been extruded from an extruder with a nozzle for introducing blow air or vertically by introducing blow air in the axial direction of the parison. The discharge outlet is formed in part of the side wall or bottom wall of the container below a cutting position preferably as low as possible. The discharge outlet may be formed by pressing the wall of a softening-state tube container against an opening of a passageway formed in the mold and connecting to the cavity with the compressed blow air to break through the tube container at the corresponding portion or by piercing with a needle-like member from outside the mold. This method enables one to shorten the cooling time necessary for cooling the tube container after blow molding and produce moldings having good dimensional accuracy with high efficiency.

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First Claim