| 摘要 |
PURPOSE:To easily control the wall thickness of a biaxially stretched blow molded bottle in the peripheral direction thereof for the purpose of increasing the thickness of the side surface of the biaxially stretched blow molded product having a flat shape. CONSTITUTION:In the production of a biaxially stretched blow molded product having a flat shape, a preform rotated at a constant speed is temporarily stopped or changed in its rotational speed in a process reheating the preform 2 to stretching temp. to make the heating of the preform 2 non-uniform in the peripheral direction of the preform and, subsequently, when the preform 2 is inserted in a blow mold, the temporary stop surface of the preform 2 or the high temp. part heated at a low speed of the preform 2 is allowed to correspond to the position in the short diameter direction of the mold of the bottle 1 having the flat shape to perform blow molding. |
