Abstract: A method of producing FRP includes disposing a preform made of a reinforcing fiber base material in a cavity of a mold, providing a resin injection path and a suction path that sucks at least air to the mold, and causing resin from the resin injection path to flow in a direction toward the suction path in the cavity to be impregnated into the preform, wherein 1) a high flow resistance region for partially making the resin flowing in the preform hardly flow is formed in the preform itself, 2) a flow front of the resin flowing in the direction toward the suction path through the high flow resistance region is controlled to settle within a permitted region that has been predetermined relative to a shape of a product to be molded, 3) the resin injection path is formed from a runner provided around the preform and the suction path is disposed at a central portion of the preform, and the high flow resistance region is formed at a corresponding part corresponding to a part around the suction path as a high flow resi

Abstract: An RTM method in which a preform formed from a reinforcing fiber substrate is placed in a cavity of a molding die, and resin is injected from a plurality of injection ports into the cavity and impregnated into the preform, includes disposing the plurality of injection ports in first positions in a central section of the cavity corresponding to positions of the preform located in a product area of an article to be finally molded and second positions located in a periphery of the cavity corresponding to positions of the preform outside the product area of the article to be finally molded or corresponding to positions inside the cavity but outside an area of the preform, and causing the timing of closing the injection ports after resin injection to be different from each other between injection ports disposed in the first positions and injection ports disposed in the second positions.

Abstract: A method for producing FRP in which a preform made of a reinforcing fiber base material is disposed in a cavity of a mold, a resin injection path and a suction path that sucks at least air are provided to the mold, and resin from the resin injection path is caused to flow in the direction toward the suction path in the cavity to be impregnated into the preform, wherein a high flow resistance region for partially making the resin flowing in the preform hardly flow is formed in the preform itself, and a flow front of the resin flowing in the direction toward the suction path through the high flow resistance region is controlled to settle within a permitted region that has been predetermined relative to a shape of a product to be molded.

Abstract: A method of producing FRP includes disposing a preform made of a reinforcing fiber base material in a cavity of a mold, providing a resin injection path and a suction path that sucks at least air to the mold, and causing resin from the resin injection path to flow in a direction toward the suction path in the cavity to be impregnated into the preform, wherein 1) a high flow resistance region for partially making the resin flowing in the preform hardly flow is formed in the preform itself, 2) a flow front of the resin flowing in the direction toward the suction path through the high flow resistance region is controlled to settle within a permitted region that has been predetermined relative to a shape of a product to be molded, 3) the resin injection path is formed from a runner provided around the preform and the suction path is disposed at a central portion of the preform, and the high flow resistance region is formed at a corresponding part corresponding to a part around the suction path as a high flow resi

Abstract: A method for laser-cutting a carbon fiber substrate such as a preform is configured from fabric material comprising at least carbon fibers, characterized by cutting the carbon fiber substrate at initial conditions which have been set so that the state of the substrate that is being cut with a laser can be suppressed with or prevented from deviating from a target state. By the method, it is possible to effectively solve various problems such as dissipation of heat, positional shifting from the focal length range of the laser, and soot, and the carbon fiber substrate can be stably cut at the target desired state.

Abstract: An RTM method in which a preform formed from a reinforcing fiber substrate is placed in a cavity of a molding die, and resin is injected from a plurality of injection ports into the cavity and impregnated into the preform, includes disposing the plurality of injection ports in first positions in a central section of the cavity corresponding to positions of the preform located in a product area of an article to be finally molded and second positions located in a periphery of the cavity corresponding to positions of the preform outside the product area of the article to be finally molded or corresponding to positions inside the cavity but outside an area of the preform, and causing the timing of closing the injection ports after resin injection to be different from each other between injection ports disposed in the first positions and injection ports disposed in the second positions.

Abstract: A method of manufacturing a fiber-reinforced resin in which resin is injected into a reinforcing-fiber substrate placed in a molding die from an injection port opened in a direction facing a surface of the reinforcing-fiber substrate, and the resin is then impregnated into the reinforcing-fiber substrate includes forming a space for injected-resin transit passage in the reinforcing-fiber substrate in the molding die by at least partially removing in advance a section of the reinforcing-fiber substrate located directly below the injection port in a thickness direction of the reinforcing-fiber substrate, and impregnating the resin injected from the injection port into the reinforcing-fiber substrate through the space for injected-resin transit passage.

Abstract: A method for producing FRP in which a preform made of a reinforcing fiber base material is disposed in a cavity of a mold, a resin injection path and a suction path that sucks at least air are provided to the mold, and resin from the resin injection path is caused to flow in the direction toward the suction path in the cavity to be impregnated into the preform, wherein a high flow resistance region for partially making the resin flowing in the preform hardly flow is formed in the preform itself, and a flow front of the resin flowing in the direction toward the suction path through the high flow resistance region is controlled to settle within a permitted region that has been predetermined relative to a shape of a product to be molded.

Abstract: A method for laser-cutting a carbon fiber substrate such as a preform is configured from fabric material comprising at least carbon fibers, characterized by cutting the carbon fiber substrate at initial conditions which have been set so that the state of the substrate that is being cut with a laser can be suppressed with or prevented from deviating from a target state. By the method, it is possible to effectively solve various problems such as dissipation of heat, positional shifting from the focal length range of the laser, and soot, and the carbon fiber substrate can be stably cut at the target desired state.

Abstract: A layered carbon-fiber product obtained by layering one or more sheets of carbon-fiber fabrics each prepared using one or more carbon-fiber bundles each including a plurality of carbon fibers arranged in a single direction, wherein at least a part of a surfaces and/or an edge face of the layered carbon-fiber product includes a graphitized part and the graphitized part exhibits a Raman spectrum in which an intensity ratio of a D band to a G band (D-band intensity/G-band intensity) is 0.3 or less.

Abstract: A curved reinforcing fiber substrate having a curved planar shape comprising a plurality of reinforcing fiber yarns arranged parallel to a direction along a circumferential direction of the curved shape, and auxiliary weft yarns arranged in directions crossing the plurality of reinforcing fiber yarns each arranged in one direction of the circumferential direction.

Abstract: To heat a laminate of a reinforcing fiber base material uniformly with high precision, a forming-molding tool for resin transfer molding of fiber reinforced plastics obtained by integrating a face plate part and a flat plate part for forming a hollow convex part, in which metallic piping as a flow path of a heating medium is integrated with the back surface of the face plate part by a thermally conductive material and a rubber cord is integrated with an outside of a region used for forming or molding in the flat plate part is used.