| 摘要 |
PURPOSE: A method and device for extrusion-molding a multilayered synthetic resin pipe having screw type ribs are provided to quickly manufacture the synthetic resin pipe and improve the intensity of the synthetic resin pipe. CONSTITUTION: A device for extrusion-molding a multilayered synthetic resin pipe is composed of an extruding machine for supplying melted resin to both sides of a die(20), a rotary molding member(40) installed in the die, an outer-diameter sizing unit(30) installed at the outside of the rotary molding member and clamping the outer wall of the pipe, and an inner-diameter sizing unit(50) installed at the inside of the rotary molding member and clamping the inner wall of the pipe. The rotary molding member is forcibly rotated to mold the melted resin into screw type ribs.
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