| 摘要 |
<p>The object is to develop a container made of a polyester resin which is sufficiently applicable to a retort processing at a temperature exceeding 120°C and up to about 130°C, and to provide a container made of a polyester resin which can achieve the improvement in productivity or quality of retort foods and a method for producing the container. The object can be achieved by a double blow molding process which comprises a primary blow molding step in which a preform is subjected to biaxial stretching blow molding to form a primary intermediate molded article, a step in which the primary intermediate molded article is heated to shrink-mold the article into a secondary intermediate molded article, and a secondary blow molding step in which the secondary intermediate molded article is blow-molded into the shape of a container. In the secondary blow molding, the mold temperature exceeds 210°C.</p> |
