CARBON-FIBER-PRECURSOR FIBER BUNDLE AND METHOD FOR PRODUCING SAME

WIPO Patent Application WO/2020/203390

A1

Provided is a carbon-fiber-precursor fiber bundle obtained by combining a plurality of at least two flat carbon-fiber-precursor filaments, wherein: a degree of interlacement of the carbon-fiber-precursor filaments as determined by the hook drop method is 5 to 23; a yarn width X of the carbon-fiber-precursor fiber bundle with respect to a yarn width W of the carbon-fiber-precursor filaments is within a range of W ≤ X ≤ 2.2W; and the carbon-fiber-precursor filaments are arranged in the carbon-fiber-precursor fiber bundle in such a manner that 0.5 to 5 continuous clockwise turns and 0.5 to 5 continuous counterclockwise turns about a longitudinal central axis of the carbon-fiber-precursor fiber bundle as a turning axis are alternately repeated. By using the carbon-fiber-precursor fiber bundle according to the present invention, it is possible to increase a filament density during a baking step, making it possible to obtain a high-grade and high-quality carbon fiber at a low cost.

JPS5947741

[Title of the Invention] A manufacturing method of bulky thread

IHARA KOKI (JP)
HAYASHIDA KENGO (JP)
OKUMA TAKAHIRO (JP)

PCT/JP2020/012605

October 08, 2020

March 23, 2020

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TORAY INDUSTRIES (JP)

D02J1/00; D01F6/18; D01F9/22; D02J1/18

WO2005078173A1

2005-08-25

JP2017160563A	2017-09-14
JP2002294517A	2002-10-09
JP2004100132A	2004-04-02
JP2012154000A	2012-08-16
JPH0559621A	1993-03-09
JP2004250842A	2004-09-09
JP2008266810A	2008-11-06
JP2017137590A	2017-08-10

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