| abstract |
A resin-rich portion which increases interlaminar strength (peeling strength, out-of-plane strength, strength after impact) in a fiber base material for a composite material, increases matrix impregnation efficiency at the time of compounding, and is also a weak point in strength. To eliminate A substrate having a three-dimensional shape woven or woven with continuous fibers is singly or plurally laminated to increase the strength of an interlayer or a bonding surface, and to promote the permeability of a matrix near and inside a surface, A fibrous base material for a composite material which has been subjected to a brush raising 5 treatment for enhancing smoothness. The above-mentioned raising treatment is also performed on a fiber base material for a composite material in which a plurality of sheet-like base materials knitted with continuous fibers are overlapped, or a plurality of sheet-like base materials and a base material having a three-dimensional shape are stacked. . The raising process is performed by needle punching. If necessary, at the time of needle punching, the fiber web is inserted between the fiber structures simultaneously with the raising process. The surface is smoothed. [Selection diagram] Fig. 1 |