| 摘要 |
PURPOSE: To enable a fiber-reinforced thermoplastic resin composite tube to be manufactured efficiently wherein a thermoplastic resin layer laminated on an inner surface is little in one-side thickness, and fusion welding of a resin tube to a reinforced fiber composite is strong without raising extrusion pressure of the resin. CONSTITUTION: At least three fiber-reinforced thermoplastic resin sheets 100 are transferred longitudinally inside an outer die 40 for control of an outside diameter, and combined into a tubular shape of a plygonal section corresponding to the number of the sheets 100 at an inlet of the outer die 40. Thermoplastic resin 10a is extruded tubularly on an inner surface of the tubular combined material 101 from an extrusion die 30, and laminated with a polygonal section part 41 of the outer die 40 to form a tubular shape of the polygonal section. The tubular material 102 is shaped into a tubular shape of a circular or elliptical section by inner pressure of air with a section-enlarged part 42 of the outer die and its circular or elliptical section part 43. By covering an outer periphery of the shape tubular material 103 with a thermoplastic resin by extrusion as occasion demands, a target fiber-reinforced thermoplastic resin composite tube 104 is obtained. |
