| 摘要 |
<p>PURPOSE:To enable deformation of side wall parts and corner parts to be inhibited, by forming side wall parts of an intermediate layer into a curves shape more recessed than an intended shape by use of a nozzle of which inner side wall parts are formed in an inwardly projected shape. CONSTITUTION:Reinforcing fibers impregnated with a liquid thermosetting resin is applied continuously to the outer peripheral surface of a tubular inner layer 3 extruded continuously, and is formed to have a predetermined cross-sectional shape to produce an intermediate layer 2. In this case, the cross-sectional area it the material being formed is reduced gradually, with removing excess thermosetting resin 8, from a value of about 2 times the intended value by use of a plurality of forming nozzles 10. Each inner side wall part 11 of the nozzles 10 is formed in an inwardly projected shape, so that each side wall part of the intermediate layer 2 is formed into a curved shape more recessed than an intended shape. It is desirable that, assuming the cross-sectional area of the opening of the final nozzle 10 corresponding to a final outside diameter of the intermediate layer 2 as being 100, a plurality of forming nozzles having cross-sectional areas of openings of 90 to 100 be disposed on the upstream side of the final forming nozzle 10a. The intermediate layer 2 is coated with a thermoplastic resin which constitutes an outer layer 4.</p> |
