Patent ID: 7655179

Claim:
A method of producing a heat resistant resin container by stretch-molding a thermoplastic resin sheet while clamping a portion thereof that turns into a flange portion between a clamping metal mold having a recessed portion in a surface thereof that comes in contact with the sheet and a female metal mold with a clamping pressure of 4.5 to 12 MPa, further molding the thermoplastic resin sheet using compressed air into the shape of a female mold that is heated at a temperature not lower than the crystallization temperature of said resin followed by heat-setting, and reducing the pressure in the molded article so as to shrink into the shape of a plug having the shape of a final container to impart the shape thereto, followed by cooling, wherein said flange portion includes a part that is crystallized by orientation and a part that is not crystallized by orientation.