Patent ID: 8147635
Filing Date: 2012-04-03
Classification: B29B,B29C,B29K

Abstract:
1. A manufacturing method of a fiber-reinforcing resin strand comprising: forming a fiber-reinforced resin strand formed of a resin-impregnated fiber bundle obtained by spreading a reinforcing fiber bundle and letting the reinforcing fiber bundle be impregnated with a molten resin material inside a crosshead; and twisting the fiber-reinforced resin strand by pultruding the fiber-reinforced resin strand from an exit nozzle of the crosshead, wherein the fiber-reinforced resin strand is twisted by using twisting rollers including at least a pair of rollers having a roller major diameter of 50 mm or greater, the rollers being made of metal and having a surface hardness of Hs 60 or higher and having asperities on surfaces of thereof, while being pultruded from the exiting nozzle of the crosshead by using the twisting rollers.