Teijin Limited

Takashi Toyozumi

Takeru Ohki

Makoto Ootsubo

Takumi Kato

Shuhei Suzuki

Akihisa Nomura

Shuhei Onoue

Guofei Hua

Akihiko Obata

Hodaka Yokomizo

Masumi Hirata

Hiroki Sano

Jianwei Shi

Syuhei Suzuki

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

The present invention is aimed to provide a carbon fiber reinforced resin processed product which is almost free from the problems described above on a processed surface subjected to cutting or the like and has an end surface where generation of a burr is suppressed, has favorable surface properties, and surface nature, and particularly smoothness is excellent; and provides a carbon fiber reinforced resin processed product having an end surface which has fibers and a resin, wherein the end surface has a surface roughness (Rz) within a range from 5 &#x3bc;m to 50 &#x3bc;m.

Carbon fiber reinforced resin processed product having end surface and method of manufacturing the same

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.

Fiber reinforced resin joined body, intermediate body, and fastening rod

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Osaka, Japan

Takashi Toyozumi