PURPOSE: A reinforced prepreg having excellent smoothness and freed from meandering, longitudinal split and disarrangement of drafted fibers, prepared by laying a specific release paper onto one side of a prepreg of resin-impregnated unidirectionally drafted fibers, and laying a reinforcing woven fabric onto the other side of the prepreg.
CONSTITUTION: Onto one side of a unidirectionally drafted fiber prepreg, 0.05W 0.5mm thick, impregnated with 10W60wt% of a theremosetting resin, is laid a release paper, 50W150μ thick, having an elongation of below 0.5% when measured by comparing the length at a relative humidity of 60% with that at absolute dryness, and a basis weight of 70W150g/m2, and then onto the other side of the prepreg is laid a reinforcing woven fabric, 0.02W0.5mm thick, impregnated or not impregnated with a resin similar to the resin used in the prepreg. By use of the prepregs, FRP having good interlayer adhesion and mechanical properties can be produced.
TSUNODA GOROU
SAITOU SHIYUNICHIROU
ASADA SHIROU
MIYAKE AKIO
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