| 摘要 |
<p>PROBLEM TO BE SOLVED: To obtain a bottle, which shows extremely high heat resistance against heat shrinkage by a method wherein a secondary intermediate molded article, which is obtained by heat-shrinking a biaxially stretching blow-molded primary intermediate molded article at a higher temperature, is secondarily blow-molded at a temperature, which is higher than a maximum usable temperature by several degrees. SOLUTION: Primarily biaxially stretching blow-molding is applied to a primarily intermediate molded article 4 with a primarily blowing mold under the state that a main body part, which is obtained by biaxially stretching blow-molding a perform formed in advance in desired form, is heated up to the blow-moldable temperature range of 90-130 deg.C, which includes the temperature value of 120 deg.C or the temperature just before the heat crystallization temperature of PET and can produce stretching effect. By heating the resultant primarily intermediate molded article 4, which has been biaxially stretching blow-molded, up to the temperature higher than the temperature of a primarily blow mold or 170-255 deg.C and the secondarily blow mold up to the temperature higher than the highest temperature of the atmosphere, under which a molded bottle 6 is used, by 5-10 deg.C, blow molding is applied to the primarily intermediate molded article 4 so as to obtain the bottle 6.</p> |
