| 摘要 |
PURPOSE:To enhance the gas barrier properties and the like of the container concerned by a method wherein primary stretch blow molding is performed under the condition that the temperature of only the surface of a preformed body is controlled, and, when the wall thickness decreases by some extent, the temperature of the whole preformed body is controlled so as to perform secondary stretch blow molding at the end of said temperature controlling. CONSTITUTION:A primary preformed body 10, which is held with B mouth part outer mold 41 and a mouth part inner mold 42, is installed in a primary forming mold 40. At this time, the temperatures at a layer 10a near the outer surface of the body 10 and at a layer 10c near its inner surface is lower than the temperature of a central layer 10b. Next, a stretching rod 45 is inserted in the body 10 so as to abut the tip part 46 of the rod against the central part 14 of the bottom part 13 of the body 10, and, at the same time, pressurizing air is blown off through blow-off holes 47 so as to perform primary stretch blow molding in order to obtain a secondary preformed body 20. In a temperature controlling device 60, by controlling the temperatures of temperature controlling cores and of respective temperature controlling heaters 81-85 and the inflow of air, the temperature of the secondary preformed body 20 is controlled from its inner and outer surfaces up to the temperature suitable for stretch blow molding. Finally, the secondary preformed body 20 is stretch-blow-molded so as to form a high-stretch-blow-molded container 30. |
