Teijin Limited

Makoto Ootsubo

Takeru Ohki

Naoaki Sonoda

Shuhei Onoue

Takashi Toyozumi

Takumi Kato

Shuhei Suzuki

Akihisa Nomura

Guofei Hua

Yukino Oosawa

Akihiko Obata

Hodaka Yokomizo

Katsuyuki Hagihara

Yasunori Nagakura

Takeru Ooki

Hiroya Hada

Toshiki Maeda

Takuo Kanzaki

A composite material includes a thermoplastic matrix resin and carbon fibers A including carbon fiber bundles A1 in which Li/(Ni×Di) is 6.7×10to 3.3×10, 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.

Composite material and production method therefor

The present invention provides a method for inspecting a material to be inspected using ultrasound waves, the method including the following stepto step, in which stepis performed in a condition where: the surface temperature of a material under inspection&#x2014;atmospheric temperature&#x3e;2&#xb0; C., and inspection using ultrasound waves in stepsatisfies: a refractive attenuation rate&#x2264;1.5%. Step: blowing a fluid from a blowing port onto the material to be inspected. Step: inspecting the material to be inspected using the ultrasound waves after stepor at the same time as the step

Ultrasonic inspection of extents of voids or the like in heated material using fluid blowing

A composite material which includes a thermoplastic matrix resin and carbon fibers A including carbon fiber bundles A1 in which Li/(Ni&#xd7;Di) satisfies 6.7&#xd7;10to 3.3&#xd7;10, wherein the carbon fibers A have a fiber length of 5-100 mm and have a value of Lw/(Nave&#xd7;D) of 1.0&#xd7;10to 3.3&#xd7;10, the carbon fiber bundles A1 having an average bundle width Wless 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.

Composite material, production method for molded object, and production method for composite material

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&#x3c;Ww&#x3c;5.0 mm &#x2003;&#x2003;(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.

Random mat and fiber-reinforced composite material shaped product

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).

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

Method for producing yarns separated from reinforcing fiber strands

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 ()=100&#xd7;Volume of Carbon Fibers/(Volume of Carbon Fibers+Volume of Thermoplastic Resin)&#x2003;&#x2003;Expression (a).

Carbon-fiber-reinforced resin composite material

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.

Method for producing cut bodies and method for cutting fiber-reinforced resin

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).

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.

Growing community of inventors

Osaka, Japan

Makoto Ootsubo