| 摘要 |
PURPOSE:To produce easily the bottle with a uniform thickness by a method in which the tip part of the parison whose barred is preliminarily uniaxially oriented is fixed to the bottom center of the cavity of a mold, and the parison is subjected to orientation blow-molding. CONSTITUTION:The mold having the recessed part 15e holding the tip part 17a of a parison 17 at the center of its bottom is used. When the barrel part 31c of the parison 17 is uniaxially oriented before orientation blow molding, and the tip of the parison is fixed to the center of the bottom 15d of the mold cavity, an orientation blow-molded object with a uniform thickness may be easily produced by free blow molding. It is because, since the tip of the parison is held at the bottom of the cavity, the parison is prevented from being shifted, and since the barrel of the parison is positioned almost at the center of the cavity, the draw ratio of the barrel becomes almost uniform. Even in the case of the bottle whose tap part 31b is inclined to the barrel part 31c, if the barrel part of the uniaxially oriented parison is deformed into a specified curve before oriented flow molding, the bottle with a nearly uniform thickness may be obtained. |
