| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a bottle made of a polyester compsn. not deformed even if filled with a heated beverage or the like and capable of holding a self-supporting state. SOLUTION: This bottle is composed of a polyester compsn. consisting of 99.9-99.99999wt.% of polyester and 0.1ppm-0.1wt.% of talc and characterized by that the degree of crystallization of the mouth neck part thereof is 25-60% and that of the central part of the body part thereof is 25-60%. A preform composed of the polyester compsn. is subjected to stretch blowing in area stretching magnificaton of 6-15 times to set the degree of crystallization of the central part of the body part of the bottle to 25-60%. By this constitution, a polyester bottle excellent in heat resistance can be efficiently produced.</p> |
