Abstract: A method for producing a press molded body is provided in which a material X that contains a thermoplastic resin Rx and carbon fibers A having a weight average fiber length LwA and a material Y that contains a thermoplastic resin Ry and carbon fibers B having a weight average fiber length LwB are heated, and the heated material X and material Y are pressed within a mold at the same time, thereby producing a press molded body which has a region X that is formed of the material X and a region Y that is formed of the material Y. This method for producing a press molded body is configured such that: LwB<LwA; LwB is from 0.1 mm to 15 mm (inclusive); and the press molded body has a transition zone XY where the region X and the region Y overlap with each other.

Abstract: A composite material which includes a thermoplastic matrix resin and carbon fibers A including carbon fiber bundles A1 in which Li/(Ni×Di2) satisfies 6.7×101 to 3.3×103, wherein the carbon fibers A have a fiber length of 5-100 mm and have a value of LwA1/(NA1ave×DA12) of 1.0×102 to 3.3×103, the carbon fiber bundles A1 having an average bundle width WA1 less than 3.5 mm and being contained in an amount of 90 vol % or larger with respect to the carbon fibers A A production method for producing a molded object from the composite material is also provided.

Abstract: The present invention provides a method for producing a press molded body, wherein a material X that contains a thermoplastic resin Rx and carbon fibers A having a weight average fiber length LWA and a material Y that contains a thermoplastic resin RY and carbon fibers B having a weight average fiber length LWB are heated, and the heated material X and material Y are pressed within a mold at the same time, thereby producing a press molded body which has a region X that is formed of the material X and a region Y that is formed of the material Y. This method for producing a press molded body is configured such that: LwB < LwA; LwB is from 0.1 mm to 15 mm (inclusive); and the press molded body has a transition zone XY wherein the region X and the region Y overlap with each other.

Abstract: Provided are a molded body and a method for manufacturing a molded body, the molded body comprising: reinforced fibers having a weight average fiber length of 1 mm or more and 100 mm or less: and a thermoplastic resin, wherein the molded body is provided with a first main shape surface part, a second main shape surface part connected to the first main shape surface part in a crossing state, and a connection surface part connected to both the first main shape surface part and the second main shape surface part, the connection surface part protrudes from the first main shape surface part and the second main shape surface part on a valley side formed by the first main shape surface part and the second main shape surface part, and reinforced fibers are continuously dispersed in an in-plane direction at a boundary region between the first main shape surface part and the connection surface part and a boundary region between the second main shape surface part and the connection surface part.

Abstract: Provided is a reinforcing fiber mat including a reinforcing fiber mat constituted by reinforcing fibers having an average fiber length of 3 to 100 mm. The reinforcing fibers satisfy the following i) to iv): i) a weight-average fiber width (Ww) of the reinforcing fibers satisfies the following Equation (1): 0.03 mm<Ww<5.0 mm ??(1); ii) an average fiber width dispersion ratio (Ww/Wn) defined as a ratio of the weight-average fiber width (Ww) to a number-average fiber width (Wn) of the reinforcing fibers is 1.8 or more and 20.0 or less; iii) a weight-average fiber thickness of the reinforcing fibers is smaller than the weight-average fiber width (Ww); and iv) a fiber width distribution of the reinforcing fibers included in the reinforcing fiber mat has at least two peaks.

Abstract: A composite material includes a thermoplastic matrix resin and carbon fibers A including carbon fiber bundles A1 in which Li/(Ni×Di2) is 6.7×101 to 3.3×103, and a thermoplastic matrix resin. The carbon fibers A have a fiber length of 5-100 mm and the carbon fiber bundles A1 are contained in an amount of 80 vol % or larger but less than 100 vol % with respect to the carbon fibers A and wherein removal of the matrix resin from the composite material gives a carbon fiber mass which, when compressed to a thickness of Tf, has a repulsive force P of 0.05-1.00 MPa A method for producing the composite material including subjecting a composite composition to an impregnation treatment with a compression/impregnation device.

Abstract: A composite material which includes a thermoplastic matrix resin and carbon fibers A including carbon fiber bundles A1 in which Li/(Ni×Di2) satisfies 6.7×101 to 3.3×103, wherein the carbon fibers A have a fiber length of 5-100 mm and have a value of LwA1/(NA1ave×DA12) of 1.0×102 to 3.3×103, the carbon fiber bundles A1 having an average bundle width WA1 less than 3.5 mm and being contained in an amount of 90 vol % or larger with respect to the carbon fibers A A production method for producing a molded object from the composite material-is also provided.

Abstract: Provided is a reinforcing fiber mat including a reinforcing fiber mat constituted by reinforcing fibers having an average fiber length of 3 to 100 mm. The reinforcing fibers satisfy the following i) to iv): i) a weight-average fiber width (Ww) of the reinforcing fibers satisfies the following Equation (1): 0.03 mm<Ww<5.0 mm (1); ii) an average fiber width dispersion ratio (Ww/Wn) defined as a ratio of the weight-average fiber width (Ww) to a number-average fiber width (Wn) of the reinforcing fibers is 1.8 or more and 20.0 or less; iii) a weight-average fiber thickness of the reinforcing fibers is smaller than the weight-average fiber width (Ww); and iv) a fiber width distribution of the reinforcing fibers included in the reinforcing fiber mat has at least two peaks.

Abstract: Provided is a fiber-reinforced composite material shaped product having isotropy and mechanical strength and a random mat used as an intermediate material thereof. The random mat includes reinforcing fibers having an average fiber length of 3 to 100 mm and a thermoplastic resin, in which the reinforcing fibers satisfy the following i) to iii). i) A weight-average fiber width (Ww) of the reinforcing fibers satisfies the following Equation (1). 0.03 mm<Ww<5.0 mm??(1) ii) An average fiber width dispersion ratio (Ww/Wn) defined as a ratio of the weight-average fiber width (Ww) to a number-average fiber width (Wn) of the reinforcing fibers is 1.8 or more and 20.0 or less. iii) A weight-average fiber thickness of the reinforcing fibers is smaller than the weight-average fiber width (Ww).

Abstract: The present invention provides a method for producing a joined body, the method including: disposing a joining member between a member A containing a thermoplastic resin and a member B containing a thermoplastic resin, the joining member including a sheet part containing a thermoplastic resin, and a plurality of protrusion parts integrally formed with the sheet part on at least one surface of the sheet part, the protrusion parts containing a thermoplastic resin; and melting at least a part of the joining member to join the member A and the member B to obtain a joined body thereof.

Abstract: There is provided a random mat including reinforcing fibers having an average fiber length of 3 to 100 mm and a thermoplastic resin, wherein the reinforcing fibers satisfy the following i) to iii). i) The reinforcing fibers have a weight-average fiber width (Ww) which satisfies the following equation (1). 0 mm<Ww<2.8 mm??(1) ii) The reinforcing fibers have an average-fiber-width dispersion ratio (Ww/Wn), which is defined as a ratio of the weight-average fiber width (Ww) to a number-average fiber width (Wn), of 1.00 or more and 2.00 or less. iii) The reinforcing fibers have a weight-average fiber thickness which is smaller than the weight-average fiber width (Ww) thereof.

Abstract: A fiber-reinforced plastic joined body is provided, in which a fiber-reinforced molded article (X) containing carbon fibers and a thermoplastic resin and having a joining surface (x), and a thermoplastic resin member (Y) having a joining surface (y) are welded via the joining surfaces (x) and (y) by applying ultrasonic to the molded article (X), and in which: (1) a maximum value of tan ? by viscoelastic measurement of the molded article (X) is less than 70% of a maximum value of tan ? by viscoelastic measurement of the thermoplastic resin contained in the molded article (X) within a range of a glass transition temperature ±100° C. of the thermoplastic resin contained in the molded article (X), (2) at least one of the joining surfaces (x) and (y) has an energy director, and (3) an application surface of the molded article (X) to which ultrasonic sound is applied is smooth.

Abstract: There is provided a fiber-reinforced resin joined body, including: a fiber-reinforced resin shaped product A containing reinforcing fibers and a thermoplastic resin, and including at least one a protrusion part with a buckling strength of 80 MPa to 450 MPa; and a member B including at least one through hole, wherein the protrusion part of the fiber-reinforced resin shaped product A is inserted into the through hole of the member B, and a caulked part is provided in a portion of the protrusion part, protruding from the through hole.

Abstract: There is provided a random mat including reinforcing fibers having an average fiber length of 3 to 100 mm and a thermoplastic resin, wherein the reinforcing fibers satisfy the following i) to iii). i) The reinforcing fibers have a weight-average fiber width (Ww) which satisfies the following equation (1). 0 mm<Ww<2.8 mm (1) ii) The reinforcing fibers have an average-fiber-width dispersion ratio (Ww/Wn), which is defined as a ratio of the weight-average fiber width (Ww) to a number-average fiber width (Wn), of 1.00 or more and 2.00 or less. iii) The reinforcing fibers have a weight-average fiber thickness which is smaller than the weight-average fiber width (Ww) thereof.

Abstract: There is provided a random mat including carbon fibers having an average fiber length of from 3 mm to 100 mm and a thermoplastic resin, wherein a fiber areal weight of the carbon fibers is from 25 to 10,000 g/m2, a proportion of carbon fiber bundles (A) constituted by single carbon filaments of a critical single fiber number or more defined by the formula (1) to the total amount of fibers in the random mat is from 40 to 99 Vol %, and an average number (N) of fibers in the carbon fiber bundles (A) satisfies the formula (2): critical single fiber number=600/D??(1) 2.0×105/D2?N<8.0×105/D2??(2) wherein D is an average fiber diameter (?m) of carbon fibers.

Abstract: A fiber-reinforced plastic joined body is provided, in which a fiber-reinforced molded article (X) containing carbon fibers and a thermoplastic resin and having a joining surface (x), and a thermoplastic resin member (Y) having a joining surface (y) are welded via the joining surfaces (x) and (y) by applying ultrasonic to the molded article (X), and in which: (1) a maximum value of tan ? by viscoelastic measurement of the molded article (X) is less than 70% of a maximum value of tan ? by viscoelastic measurement of the thermoplastic resin contained in the molded article (X) within a range of a glass transition temperature ±100° C. of the thermoplastic resin contained in the molded article (X), (2) at least one of the joining surfaces (x) and (y) has an energy director, and (3) an application surface of the molded article (X) to which ultrasonic sound is applied is smooth.

Abstract: There is provided a joined body in which two or more members Yi including a fitting hole are fastened, in which a fastening rod including reinforcing fibers and a thermoplastic resin is positioned in the fitting hole, the fastening rod is caulked by heat, and the members Yi are caulking-fastened.

Abstract: An isotropic fiber-reinforced thermoplastic resin sheet wherein a chopped strand prepreg comprising a thermoplastic resin and a reinforcing fiber is layered so that the fiber orientation is random, the prepreg having a fiber volume fraction (Vf) of 20% to 50%, a length in the fiber axis direction of 15 to 45 mm, and a thickness of no greater than 0.13 mm, and the layered material is molded into sheet form by heating and pressing, and a molded plate obtained from the isotropic fiber-reinforced thermoplastic resin sheet. Even if the volume fraction of the reinforcing fiber is relatively low, a fiber-reinforced thermoplastic resin sheet and a molded plate that are excellent in terms of mechanical properties and their uniformity can be obtained.

Abstract: There is provided a composite base material, including: carbon fibers having an average fiber length of 3 mm or more and 100 mm or less; and a thermoplastic resin is firmly fixed to the carbon fibers in an amount of 3 to 100 parts by mass with respect to 100 parts by mass of the carbon fibers, wherein a void ratio is more than 7 vol % to less than 100 vol %.

Abstract: There is provided a fiber-reinforced resin joined body, including: a fiber-reinforced resin shaped product A containing reinforcing fibers and a thermoplastic resin, and including at least one a protrusion part with a buckling strength of 80 MPa to 450 MPa; and a member B including at least one through hole, wherein the protrusion part of the fiber-reinforced resin shaped product A is inserted into the through hole of the member B, and a caulked part is provided in a portion of the protrusion part, protruding from the through hole.