Abstract: A preform for forming fiber reinforced plastics which involves a reinforcing fiber layer composed of aligned continuous reinforcing fiber formed by winding and a heat-meltable fiber layer wound on the reinforcing fiber layer, the layers being piled up alternately in plural layers and in such a way that the outermost layer is constituted of the reinforcing fiber layer and the reinforcing fiber layers being melt-bonded with each other by the heat-meltable fiber to form an integral body, and to a process for producing the same. The preform is suited for use in producing plastic formed articles of high strength and high rigidity employed for frames, plate springs, and other parts of automobiles, vehicles, etc.

Abstract: A method of manufacturing a fiber-reinforced resin pipe which including the steps of forming a plurality of layers by alternately winding a cloth-like material and a continuous fiber on a core. Placing the core in a split type outer mold having an inner surface which forms a desired outer surface of the pipe. Injecting a liquid synthetic resin between the outer mold and the core so that the liquid resin is integrated with the layers and cured into a molded product. Removing the molded product from the outer mold after the resin has cured and removing the core form the molded product.

Abstract: A fiber reinforced plastic molded article containing a porous resin concrete plate as a reinforcing material and a process for the production thereof are described. The porous resin concrete plate is made of 100 parts by weight of a thermosetting resin, 20 to 50 parts by weight of inorganic or organic hollow beads, and 50 to 100 parts by weight of an inorganic fine powder. The fiber reinforced molded article is produced by placing a glass fiber substrate in a mold, mounting a porous resin concrete late on the glass fiber substrate at an area to be reinforced, covering the porous resin concrete plate with a glass fiber substrate, impregnating the glass fiber substrates with a molding resin, and molding.