| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a tubular unit scarcely causing the local deterioration of strength produced by an excessive resin by dispersing a stress for bending in a well-balanced state. SOLUTION: This tubular unit is obtained by reducing the amount of an impregnated resin per unit volume of at least either one of prepregs constituting an inner surface layer A and an outer surface layer C from that of a prepreg constituting an interlayer B in the tubular unit prepared by winding the prepregs obtained by impregnating reinforcing fibers with a thermosetting resin and formed by molding the prepregs into a laminated shape having the inner surface layer A, the interlayer B and the outer surface layer C.</p> |
