MOLDED BODY COMPRISING FIBER-REINFORCING COMPOSITE MATERIAL

摘要

The purpose of the present invention is to provide a lightweight molded body with a degree of freedom of shape, comprising a fiber-reinforcing composite material including reinforcing fibers and a thermoplastic resin. The present invention is a molded body that exhibits excellent isotropy, and comprises a fiber-reinforcing composite material with discontinuous reinforcing fibers that are oriented in two dimensions with in-plane isotropy in the thermoplastic resin. The molded body is characterized in that reinforcing-fiber bundles (A) are configured from an amount of reinforcing-fibers above the critical thread count, as defined in general formula (1). The molded body is further characterized in that the proportion of reinforcing-fiber bundles (A) to the total amount of reinforcing fibers is equal to or higher than 20 vol% and less than 90 vol%, and that the average number of fibers (N) in the reinforcing fiber bundles (A) satisfies general formula (2). Critical thread number = 600/D (1) 0.7x104/D25/D2 (2) (Here D is the average fiber diameter (µm) of the reinforcing fibers.)