Patent ID: 7582249

Claim:
A method for manufacturing a thermoplastic resin vessel, comprising the sequential steps of: 1) fixing an outer periphery of a portion to be formed to a cup-shaped vessel of a thermoplastic resin sheet by pre-clamped molds; 2) pre-forming an inner portion of the fixed portion of the thermoplastic resin sheet by a plug, wherein a portion corresponding to an orifice portion or a flange portion of the cup-shaped vessel is drawn; 3) clamping the portion corresponding to the orifice portion or the flange portion of the cup-shaped vessel further by an upper mold and a lower mold; 4) drawing an inner portion of the clamped portion further by the plug; 5) pneumatically forming the drawn portion into a shape of the lower mold heated at not less than a crystallization temperature of the thermoplastic resin sheet, and thermally fixing the sheet; and 6) decompressing an inside of the formed article to contract the formed article into a shape of the plug which is a final vessel shape, and cooling the article.