초록 ▼

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.degree. to 130.degree. C., biaxial-orientation blow-molding the preform in a primary blowing

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.degree. to 130.degree. C., biaxial-orientation blow-molding the preform in a primary blowing mold heated at 110.degree. to 230.degree. C. to form a primary intermediate molded bottle-shaped piece, heating the primary intermediate molded bottle-shaped piece at 130.degree. to 255.degree. C. or at a temperature which is at least 20.degree. 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.degree. 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 of the present invention has no stress remaining from biaxial orientation blow-molding and has a high heat resistance temperature value.

대표청구항 ▼

[ What is claimed is:] [1.] An intermediate product created during a process of blow-molding polyethylene terephthalate resin into a bottle-shaped container, comprising a biaxial-orientated, blow-molded, thermally contracted intermediate molded bottle-shaped product having essentially no residual st

[ What is claimed is:] [1.] An intermediate product created during a process of blow-molding polyethylene terephthalate resin into a bottle-shaped container, comprising a biaxial-orientated, blow-molded, thermally contracted intermediate molded bottle-shaped product having essentially no residual stress and capable of being formed into a bottle-shaped container by subsequent blow-molding that is resistant to deformation caused by contents heated up to 70.degree.-120.degree. C.,wherein the process includes a step of primary blow-molding a preform heated to a blow-molding temperature to produce a primary biaxial-orientated blow-molded bottle-shaped article and thermal contraction comprises heating said primary biaxial-orientated blow-molded bottle-shaped article to a temperature between about 130.degree. C. to about 255.degree. C. while allowing said primary article to shrink, said heating continuing for a period of time sufficient to remove essentially all residual stress.