FLAME RESISTANT FIBER BUNDLES, CARBON FIBER BUNDLE PRODUCTION METHOD, AND FLAME RESISTANT FURNACE

WIPO Patent Application WO/2021/187518

A1

 The present invention addresses the problem of producing high-quality flame resistant fiber bundles and carbon fiber bundles with high efficiency. A method for producing flame resistant fiber bundles by thermally treating aligned acrylic fiber bundles in an oxidizing atmosphere while having the bundles turned around by guide rollers provided at both ends outside the body of a hot-air heating type flame resistant furnace, wherein hot air is supplied, from supply surfaces provided above and/or below the acrylic fiber bundles, in a fiber bundle passage flow path above and/or below a supply nozzle that is for supplying hot air into a thermal treatment chamber and that is provided at one end in a direction in which the acrylic fiber bundles are conveyed, and an air velocity Vf in a direction generally parallel to the direction in which the acrylic fiber bundles are conveyed in the fiber bundle passage flow path, and an air velocity V in a direction generally parallel to the direction in which the acrylic fiber bundles are conveyed in the thermal treatment chamber, satisfy conditions (1) and (2). (1): 1.5 m/s ≤ Vf ≤ 15 m/s, (2): 1.5 m/s ≤ V ≤ 10 m/s

YAMAMOTO TAKU (JP)
HOSOTANI NAOTO (JP)
FUNAKOSHI JOJI (JP)

PCT/JP2021/010787

September 23, 2021

March 17, 2021

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TORAY INDUSTRIES (JP)

D01F9/22

JP2000088464A	2000-03-31
JP2007247130A	2007-09-27
JP2005248339A	2005-09-15
JP2017218720A	2017-12-14
JP2000160435A	2000-06-13
JP2011127264A	2011-06-30
JP5856081B2	2016-02-09
JP5856082B2	2016-02-09
JP4796467B2	2011-10-19

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