| 摘要 |
PURPOSE:To make it possible to retain the favorable shape of a container even at hot filling and sterilization by heating by a method wherein an intermediate molded item, on the body part of which projected parts relatively large in diameter are formed, is once manufactured by biaxially stretching blow molding and, after that, said projected parts are reversed to be formed into panel-like recessed parts. CONSTITUTION:With split molds 10 having cavity surfaces, the biaxially stretching blow molding of a bottomed preform is performed so as to form an intermediate molded item 30, on the body part of which projected parts relatively large in diameter are formed. In this case, said split molds 10 are heated up to a thermosetting temperature so as to thermoset the formed intermediate molded item by successively holding in the split molds under the state that fluid pressure is applied in the interior of the molded item. Proper corresponding rods 40 are pressed against the projected parts 20 of the thermoset intermediate molded item 30, under the condition that the position of which is fixed, so as to dent the projected parts in order to reverse the projected parts 20. Thus, panel-like recessed parts, the wall of each of which is thinner than that of the remaining part, are formed. |
