REINFORCING FIBER BASE MATERIAL FOR PREFORMS, PROCESS FOR THE PRODUCTION OF LAMINATES THEREOF, AND SO ON

摘要

The invention provides (1) a reinforcing fiber base material having a weave constituted of both reinforcing fiber filaments arranged in one direction in parallel with each other and auxiliary yarns arranged in another direction, which satisfies the relationship: L = H/cos ? (wherein L is the length of auxiliary yarn covering one reinforcing fiber filament and H is the width of the filament as determined in such a state where the reinforcing fiber filaments are unified only with the auxiliary yarns; and 3°< ? (in-plane shear strain) < 30°) and in which an adhesive resin having a glass transition temperature of 0 to 95°C adheres to at least one side in an amount of 2 to 40g/m² in spots, lines, or discontinuous lines; (2) a laminate obtained by laminating reinforcing fiber base materials as described above in which the adhesive resin adhering to each base material adheres to another base material opposite thereto partially over the whole surface with the maximum length of each adhesive joint being 1mm or above and up to the width (H) of the reinforcing fiber filament; and (3) a preform obtained by shaping the laminate and having a reinforcing fiber volume fraction (Vpf) of 45 to 62%.