| 摘要 |
PURPOSE:To control the wall thickness even if a hollow continuous material and manufacture a uniform molded product with a given wall thickness accuracy by carrying a pasion on a bottom force of a clamping mechanism of a transfer means and dropping the parison into a cavity of the bottom force. CONSTITUTION:Simultaneously with extruding a parison 19 out of an extruder 7, a supporting lever 26 is moved horizontally in the direction of a clamping mechanism 16 by the action of a hydraulic cylinder 24. The extrusion speed of the parison 15 and the moving speed of the supporting lever 26 are controlled equal, and the parison 15 is laid horizontally on the supporting lever 26. The hydraulic cylinder 24 is further extended and the parison 15 is transferred to a mold cavity 20' of a bottom force 20, and the supporting lever 26 and the parison 15 are dropped into a cavity 20' and placed thereon. In a site where a similar screw cylindrical section 1 and a male screw cylinder section 2 and a branch tube 3 of an intermediate section of both ends are formed, and the wall thickness of the parison 15 is thicker than those of other sections and placed into the mold cavity 20'. Simultaneously a top force 1 is fixed by pressure, compressed air is blown into the parison 15, and a flexible tube 4 of the outer shape of mold cavities 20' and 21' can be molded, and the flexible tube 4 of uniform thickness is molded by adjust ing the wall thickness of the parison 15. |
