| 摘要 |
PURPOSE:To easily produce locally thick-walled parison and odd-shaped parison by a method wherein a core is divided into a main core and a sub-core, which is axially slidably fitted into a recess formed at the tip of the main core, and raising and lowering actuators are respectively connected to the main core and to the sub-core. CONSTITUTION:A core 3 is divided into a cylindrical main core 19 having a convergent tip part and a cylindrical sub-core 20 having a divergent tip part. A raising and lowering main actuator 23a is connected to the main core 19 and a raising and lowering sub-actuator 23b is connected to the sub-core 20 so as to raise or lower the sub-core 20 relative to the main core 19 through the expanding and contracting actions of the actuator 23. Thus, the gap of a resin path 17 can be enlarged, resulting in allowing to produce thick-walled parison for a blow molding item, in which local thickening is required. At the same time, odd-shaped parison is produced by axially slidably fitting the cylindrical sub-core 20 into the recess 22 at the tip of the main core 19. |
