| 摘要 |
PURPOSE:To provide a method and a device for molding a parison in which a straight parison without bending is manufactured in the case of extrusion molding the parison with the wall thickness adjusted particularly in the radius direction. CONSTITUTION:In a method and a device for molding a parison in which a parison A is extruded out of a ring nozzle 14 formed below a resin storage chamber 3 by sliding a piston 4, disposed in a cylinder 1, in the resin storage chamber 3, the parison A can be extruded straight in the vertical direction out of the ring nozzle 14 by making the parison extrusion speeds different for respective piston pieces 4a-4d divided into a plurality of pieces. |
