| 摘要 |
PURPOSE:To improve and stabilize the quality of a product by stabilizing the pipe wall thickness of a product, and at the same time, preventing the joggle defect from happening in the blow-molding of a pipe body. CONSTITUTION:At a curved area: A, of a curved groove 24 in response to the aimed pipe body shape, which is formed on a die fitting surface 22 of a lower die 20, a parison is arranged and held along the curved outer peripheral surface 38 of the curved groove 24 by a positioning member 30 which is projected from the curved inner peripheral surface 36 to the inside of the curved groove 24 by a specified energizing force. At the same time, the positioning member 30 is pushed out from the curved groove 24 while resisting to the energizing force, accompanying the diameter expansion by the injection of compressed air to said parison. By doing this, the parison is guided to the curved inner peripheral surface 36 of the curved groove 24 by the positioning member 30. |
