Teijin Limited

Teijin Carbon Europe Gmbh

Hidekazu Yoshikawa

Yosuke Nakamura

Toru Kaneko

Takaya Suzuki

Akimichi Oda

Ronny Wockatz

Hironori Kawamoto

Shuhei Yoshida

Dirk Ortmanns

Taisuke Fujimoto

Atsumi Nishida

A method for manufacturing a precursor fiber bundle provides precursor fiber bundles used in manufacturing carbon fiber bundles allowing high productivity and having high tensile strength with less yarn bundle divides in the fiber bundles. The method for manufacturing a precursor fiber bundle includes spinning by extruding a spinning solution through a spinneret to produce a coagulated fiber bundle, and interlacing the coagulated fiber bundle by applying a fluid onto the coagulated fiber bundle. The interlacing includes applying the fluid () under a pressure in a range of 0.01 to 0.05 MPa onto the coagulated fiber bundle () with a moisture content in a range of 25 to 50% under a tension of 0.02 g/dtex or less.

Method for manufacturing precursor fiber bundle, method for manufacturing carbon fiber bundle, and carbon fiber bundle

A carbon fiber bundle having a high abrasion resistance property and simultaneously being excellent in widening property is provided by a carbon fiber bundle with an adhered sizing agent including a carbon fiber bundle, and a sizing agent adhered to a surface of the carbon fiber bundle, wherein the sizing agent contains an epoxy compound, and shows an intersection of a storage modulus and a loss modulus at an angular frequency in the range of 1×10to 1×10rad/sec in a measurement at 25° C.

Carbon fiber bundle with adhered sizing agent

An object of the present invention is to provide a carbon fiber which exhibits excellent strength development rate when used in a composite material. The present invention that solves the problems is a carbon fiber which simultaneously satisfies the following formulae (1) and (2):&#x2264;3&#x2003;&#x2003;(1)TS&#xd7;&#x3e;6.0&#xd7;10&#x2003;&#x2003;(2)

Carbon fiber bundle, prepreg, and fiber-reinforced composite material

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Osaka, Japan

Hidekazu Yoshikawa