| abstract |
(57) [Summary] [Purpose] To prevent the occurrence of misalignment in the fibers of the fiber preform produced by the FW method. A method for producing a fiber preform, which is set in a cavity of a mold and is impregnated with a matrix resin for reaction injection molding which is injected into the mold to form a fiber-reinforced resin product. While immersing roving, tape, yarn, monofilament or cloth-shaped reinforcing fiber in the sizing agent solution, wind it around the mandrel, the core covered with the mandrel or the outer surface of the core made of solid body at the required angle. . The concentration of the sizing agent solution for immersing the reinforcing fibers in the portion where the fiber angle is likely to be displaced is set higher than the concentration of the sizing agent solution for immersing the reinforcing fibers in the other portions. |