| 摘要 |
PURPOSE:To heat uniformly and precisely a molded item, by heating the molded item to be blow molded by the radiation heat from a plurality of heaters arranged side by side while the molded item is positioned horizontally and is being rotated about its axis. CONSTITUTION:When the cylindrical molded item (P) that has a bottom and is to be blow molded should be heated by the radiation heat of heaters, the molded item (P) is positioned horizontally and while the molded item (P) is being rotated about its axis, it is heated by the radiation heat of the plurality heaters H1-H7 arranged side by side so that interference of heat may not be caused which would be otherwise caused by the convection of heat due to heaters arranged oppositely above and below the molded item (P). In this method, the molded item (P) is heated uniformly as a whole, so that thickness deviation would not occur in the biaxially orientated and blow molded item. Furthermore, as there is no interference of heat, the control of the heaters (H) can be facilitated. |
