| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method and apparatus for manufacturing a resin tube capable of forming a wall-thickness changing part and a material-changing part exactly at a desired position in the length direction. <P>SOLUTION: On the way of extruding a resin tube from an extruder 10, a position of the front end in an extrusion direction of the resin tube is detected by a detecting means 168, according to the position of the front end of the resin tube detected by the detecting means 168, a first changing means 26 for changing the resin material extruded from the extruder 10 or a second changing means 81 for changing the width of a die gap 72 of an extrusion die 12 in the periphery direction is simultaneously or selectively actuated by control using a controlling means 32. <P>COPYRIGHT: (C)2006,JPO&NCIPI</p> |
