Abstract: The present invention provides a method for inspecting a material to be inspected using ultrasound waves, the method including the following step 201 to step 301, in which step 201 is performed in a condition where: the surface temperature of a material under inspection—atmospheric temperature>2° C., and inspection using ultrasound waves in step 301 satisfies: a refractive attenuation rate?1.5%. Step 201: blowing a fluid from a blowing port onto the material to be inspected. Step 301: inspecting the material to be inspected using the ultrasound waves after step 201 or at the same time as the step 201.

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: 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: The present invention provides a method for inspecting a material to be inspected using ultrasound waves, the method including the following step 201 to step 301, in which step 201 is performed in a condition where: the surface temperature of a material under inspection—atmospheric temperature >2° C., and inspection using ultrasound waves in step 301 satisfies: a refractive attenuation rate ?1.5%. Step 201: blowing a fluid from a blowing port onto the material to be inspected. Step 301: inspecting the material to be inspected using the ultrasound waves after step 201 or at the same time as the step 201.

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: A method for producing yarns separated from reinforcing fiber strands including a process of intermittently separating fibers of the reinforcing fiber strands.

Abstract: A carbon-fiber-reinforced resin composite material includes: carbon fibers including carbon fiber bundles and a thermoplastic resin, in which (1) a coefficient of variation (CV1) of a total areal weight of the carbon-fiber-reinforced resin composite material is 10% or lower, (2) a coefficient of variation (CV2) of a carbon fiber volume fraction (Vf) in the carbon-fiber-reinforced resin composite material which is defined by Expression (a) is 15% or lower, and (3) a weight average fiber length of the carbon fibers is 1 to 100 mm. Carbon Fiber Volume Fraction (Vf)=100×Volume of Carbon Fibers/(Volume of Carbon Fibers+Volume of Thermoplastic Resin)??Expression (a).

Abstract: According to an aspect of the present invention, there is provided a method for producing cut bodies including: cutting a fiber-reinforced resin material, the fiber-reinforced resin material including reinforcing fibers and a thermoplastic resin, the reinforcing fibers having a tensile strength of 1,000 MPa to 6,000 MPa; and heating the fiber-reinforced resin material, wherein a flexural modulus of the fiber-reinforced resin material at the cutting is decreased to a value ranging from 80% to 15% of the flexural modulus of the fiber-reinforced resin material before heating.

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 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 method for producing yarns separated from reinforcing fiber strands including a process of intermittently separating fibers of the reinforcing fiber strands.

Abstract: A carbon-fiber-reinforced resin composite material includes: carbon fibers including carbon fiber bundles and a thermoplastic resin, in which (1) a coefficient of variation (CV1) of a total areal weight of the carbon-fiber-reinforced resin composite material is 10% or lower, (2) a coefficient of variation (CV2) of a carbon fiber volume fraction (Vf) in the carbon-fiber-reinforced resin composite material which is defined by Expression (a) is 15% or lower, and (3) a weight average fiber length of the carbon fibers is 1 to 100 mm. Carbon Fiber Volume Fraction (Vf)=100×Volume of Carbon Fibers/(Volume of Carbon Fibers+Volume of Thermoplastic Resin) . . . Expression (a).

Abstract: A method for manufacturing a reinforcing fiber strand is provided, in which a strand including reinforcing fibers passes through an uneven jig and a widening jig in this order, the uneven jig including a plurality of uneven portions having notched and protrusion portions, and the strand is divided by the protruding portions.

Abstract: According to an aspect of the present invention, there is provided a method for producing cut bodies including: cutting a fiber-reinforced resin material including reinforcing fibers having a tensile strength of 1,000 MPa to 6,000 MPa and a thermoplastic resin, wherein a flexural modulus of the fiber-reinforced resin material is decreased to 80% to 15% at the cutting.

Abstract: A method for manufacturing a reinforcing fiber strand is provided, in which a strand including reinforcing fibers passes through an uneven jig and a widening jig in this order, the uneven jig including a plurality of uneven portions having notched and protrusion portions, and the strand is divided by the protruding portions.

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: 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.