RANDOM MAT AND FIBER REINFORCED COMPOSITE MATERIAL

摘要

The purpose of the present invention is to provide a random mat used as a perform of a fiber-reinforced composite material shaped product. The random mat of the present invention including: reinforcing fibers having an average fiber length of 5 to 100 mm; and a thermoplastic resin,
wherein a fiber areal weight of the reinforcing fibers is from 25 to 3,000 g/m 2 , for a reinforcing fiber bundle (A) including the reinforcing fibers equivalent to or more than a critical single fiber number defined by formula (1), a ratio of the reinforcing fiber bundle (A) to a total amount of the reinforcing fibers in the mat is from 30 vol% to less than 90 vol%, and an average number (N) of the reinforcing fibers in the reinforcing fiber bundle (A) satisfies formula (2): Critical single fiber number = 600 / D 0.7 × 10 4 / D 2 < N < 1 × 10 5 / D 2 wherein D is an average fiber diameter (µm) of single reinforcing fibers.