Intermediate product capable of being formed into a biaxially oriented polyethylene terephthalate resin bottle-shaped container and method of blow-molding the same

摘要

A biaxially oriented polyethylene terephthalate resin bottle-shaped container, and method of blow-molding the same, is disclosed. The method comprises the steps of heating the body portion of a preform at 90 DEG to 130 DEG C., biaxial-orientation blow-molding the preform in a primary blowing mold heated at 110 DEG to 230 DEG C. to form a primary intermediate molded bottle-shaped piece, heating the primary intermediate molded bottle-shaped piece at 130 DEG to 255 DEG C. or at a temperature which is at least 20 DEG C. greater 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 DEG to 150 DEG 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 of the present invention has no stress remaining from biaxial orientation blow-molding and has a high heat resistance temperature value.