Patent ID: 7485251

Claim:
A method for producing a bottle-shaped container mainly made of polyethylene terephthalate, comprising the steps of: first biaxially-oriented blow-molding a preform mainly made of polyethylene terephthalate in a first metal mold, to form a primary intermediate molded article, causing thermal contraction of the primary intermediate molded article by heating the primary intermediate molded article, to form a secondary intermediate molded article, and second blow-molding the secondary intermediate molded article in a second metal mold, to form the bottle-shaped container, characterized in that in the second biaxially-oriented blow-molding step, fluid under high pressure is blown into the secondary intermediate molded article to expand the secondary intermediate article, and then further fluid is blown into and circulated in the expanded article to cool the expanded article, so as to minimize the high pressure blow time.