Unidirectional reinforcing fiber woven knitted fabric for fiber reinforced plastic and its fiber base material, method for producing same fiber base material and method for forming fiber reinforced plastic using same fiber base material

摘要

PROBLEM TO BE SOLVED: To provide a fiber-reinforced woven or knitted material excellent in resin impregnation and mechanical characteristics which can be manufactured at low cost, a fiber base material using the fiber-reinforced woven or knitted material, and method of manufacturing a fiber-reinforced plastic using the base material.SOLUTION: The fiber base material is made of a unidirectional fiber-reinforced woven or knitted fabric 13 which locally has clearances and in which a reinforced fiber yarn having an uneven twist part in at leaset one layer of the fiber base material is arranged as warp 11. The filament number is 50000 to 100000, and/or the yarn fineness is 32670 to 65340 dtex, and basis weight is 600 to 1000 g/m. In a method of molding, at least one or more layers of the fiber-reinforced woven or knitted material are laminated in a mold 9, and after placing a medium 17 for diffusing a resin in the surface direction, the fiber base material and the medium are entirely covered with a bag film 18. Then a vacuum is produced in the part covered with the bag film, and a heat curable resin is diffused onto one surface of the laminated fiber base material and cured after impregnation to the fiber base material.