| 摘要 |
PURPOSE:To manufacture continuously a flexible composite pipe superior in flexibility for its pressure-resistant strength, by a method wherein after manufacturing of a spiral reinforcing line by winding up spirally two reinforcing hoops whose cross section has been made into about a U-shaped state so that opening parts of them are arranged in the opposite direction and alternately to each other, an inner and outer circumferential surfaces of the spiral reinforcing line are coated with a resin material. CONSTITUTION:Two hoop materials made of a metallic thin plate are sent continuously into a rolling roll group in parallel with each other and rolling molding of a first and second reinforcing hoops 2, 2' is performed by the rolling roll group so that opening parts of them become reverse direction to each other. Then a spiral reinforcing line 2A is manufactured by sending the reinforcing hoops 2, 2' into a shaping roll 4 group in order and along with forming of a shape in a state of a circular arc, and they are wound up spirally. Then resin materials 1A, 1B are extruded in a platelike state through dies 6A, 6B arranged on the inside and outside of the spiral reinforcing line 2A while keeping them at a semimolten state. Then a spiral pipe wall 1 is manufactured by winding round and coating to the inner and outer circumferential surfaces of the reinforcing line 2A with the materials through a press roll under a state where side fringe parts adjoining to each other are superposed and welded each other in order.
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