METHOD OF BLOW-MOLDING A BIAXIALLY ORIENTED POLYETHYLENE TEREPHTHALATE RESIN BOTTLE-SHAPED CONTAINER AND CONTAINER PRODUCED BY SUCH METHOD

摘要

A method of blow-molding a biaxially oriented polyethylene terephthalate resin bottle-shaped container is disclosed. The method comprises the steps of heating the body portion of a preform at 100 to 120.degree.C, biaxialorientation blow-molding the preform in a primary blowing mold heated at 110 to 230.degree.C to form a primary intermediate molded bottle-shaped piece, heating the primary intermediate molded bottle-shaped piece at 130 to 255.degree.C or at a temperature which is 20.degree.C or higher than the primary blowing mold temperature to form a secondary intermediate molded bottle-shaped piece, and blow-molding the secondary intermediate molded bottle-shaped piece in a secondary blowing mold heated at 100 to 150.degree.C to form a bottle-shaped container. The temperature of the secondary blowing mold is several degrees greater than the maximum temperature the molded bottle-shaped container will be subjected to during use, The bottle-shaped container has no stress remaining from biaxial orientation blow-molding and has a high heat resistance temperature value.