| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a manufacturing method of a sheath pipe which can be continuously molded without providing a joint and protects a cable of which the outer periphery has a spiral shape uniform in thickness. <P>SOLUTION: The synthetic resin such as polypropylene or polyethylene extruded from the gap between the nozzle 6 and die 7 of an extruder 3 is sucked to a mold 8 by vacuum and the mold is rotated at the same time to continuously mold the sheath pipe of which the outer periphery has a spiral shape uniform in wall thickness. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
