Teijin Limited

Keizo Yokoyama

Tadashi Yamaji

Shuhei Onoue

Kohei Oka

The present invention provides a method for producing a press-molded body, the method having: a step for placing a material X in a mold; a step for closing the mold and injecting a material Y, which is a kneaded material, into the mold after pressure has begun to be applied to part of the material X; and a step for cold-pressing the material X and the material Y in the mold to integrally mold these materials, wherein the material X is cut from a composite material M that includes reinforcing fibers FA having a weight-average fiber length Lwand a thermoplastic resin R, the material Y includes carbon fibers B having a weight-average fiber length Lwand a thermoplastic resin R, Lw<Lw, and Lwis 1-100 mm inclusive.

Method for producing press-molded body

The present invention provides a method for manufacturing a press-molded body, the method having a step for disposing an X material inside a mold, a step for closing the mold and extruding a Y material, which is a kneaded material, into the mold after pressure has begun to be applied to part of the X material, and a step for cold-pressing and integrally molding the X material and the Y material inside the mold, wherein: the X material includes reinforcing fibers FA, having a weight-average fiber length Lw, and a thermoplastic resin R; the Y material includes reinforcing fibers FB, having a weight-average fiber length Lw, and a thermoplastic resin R; Lw<Lw; Lwis 1 mm or greater and 100 mm or less; the X material has a spring-back amount greater than 1.0 and less than 14.0; the press-molded body has an vertical plane part and a top plane part; during the cold pressing, the Y material is caused to move from a region other than a vertical plane portion to the vertical plane portion; and a thickness tof the vertical plane portion and a thickness tof the top plane portion satisfy t>t

Method for manufacturing press-molded body

Provided is a resin-made impact absorption member including: an impact absorption portion which includes a fiber-reinforced resin material containing reinforcing fibers and a thermoplastic resin and has a hollow structure including an outer cylindrical portion and a hollow portion, in which the reinforcing fiber has an average fiber length of 1 mm to 100 mm, the thermoplastic resin has a fracture elongation of 10% or more, the fiber-reinforced resin material has a compressive elastic modulus of 10 GPa or more and a compressive strength of 150 MPa to 500 MPa, and in the impact absorption portion, a maximum value of a ratio L/tof a distance Lfrom a position of the center of gravity to the outer cylindrical portion on a same section in a sectional shape in a direction orthogonal to an impact absorption direction, to a thickness tof the outer cylindrical portion, is 40 or less.

Growing community of inventors

Osaka, Japan

Keizo Yokoyama