Teijin Limited

Takeru Ohki

Makoto Ootsubo

Naoaki Sonoda

Hiroki Sano

Takumi Kato

Takashi Toyozumi

Katsuyuki Hagihara

Shuhei Suzuki

Akihisa Nomura

Shuhei Onoue

Guofei Hua

Masumi Hirata

Takeshi Naito

Masahiro Kitagawa

Yoshitaka Umemoto

Jianwei Shi

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

A method for producing a press molded body is provided in which a material X that contains a thermoplastic resin Rand carbon fibers A having a weight average fiber length Land a material Y that contains a thermoplastic resin Rand carbon fibers B having a weight average fiber length Lare 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: L<L; Lis 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.

Method for producing press molded body

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).

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 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:

Fiber-reinforced plastic joined body, method for producing fiber-reinforced plastic joined body, and fiber-reinforced molded article

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.

Fiber-reinforced resin joined body having caulked part and manufacturing method thereof

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/m, 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/&#x2003;&#x2003;(1)2.0&#xd7;10&#x3c;8.0&#xd7;10&#x2003;&#x2003;(2)

Random mat, shaped product of fiber reinforced composite material, and carbon fiber mat

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

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.

Isotropic fiber-reinforced thermoplastic resin sheet, and process for production and molded plate thereof

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 %.

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Matsuyama, Japan

Takeru Ohki