| 摘要 |
<p>PURPOSE: To manufacture a tubular body having a light weight and a high strength by a method wherein thin layers corresponding to reinforcing layers and prepared by impregnating reinforcing fibers with a thermosetting synthetic resin are formed on layers corresponding to a main body and prepared by impregnating carbon fibers with the thermosetting synthetic resin and winding round, and they are pressed by a tightening body from outside and heated. CONSTITUTION: Carbon fibers are impregnated with a thermosetting synthetic resin and an area PA being poor in the amount of the resin and an area RA being rich in it are provided in the direction of thickness, while the average amount of the thermosetting synthetic resin for impregnation is made a value of 10 to 20wt.% approximately. The carbon fibers are wound round so that they are directed practically in the longitudinal direction of a core, and thereby a main-body layer 12 is formed so that the area RA being rich in the amount of the resin is made to face a layer on one side, at least, out of adjacent layers at the boundaries of the wound layers. Then, a prepreg prepared by impregnating reinforcing fibers with the thermosetting synthetic resin is wound round so that the main fiber directions intersect the carbon fibers directed practically in the longitudinal direction, so as to form thin reinforcing layers 14 and 16. The reinforcing layers 14 and 16 and the main-body layer 12 are pressed by tightening from outside and heated and thereby a tubular body can be manufactured.</p> |
