Global Patent Index - EP 4123065 A1

EP 4123065 A1 20230125 - FLAME RESISTANT FIBER BUNDLES, CARBON FIBER BUNDLE PRODUCTION METHOD, AND FLAME RESISTANT FURNACE

Title (en)

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

Title (de)

FLAMMFESTE FASERBÜNDEL, VERFAHREN ZUR HERSTELLUNG VON KOHLENSTOFFASERBÜNDELN UND FLAMMFESTER OFEN

Title (fr)

FAISCEAUX DE FIBRES IGNIFUGES, PROCÉDÉ DE PRODUCTION DE FAISCEAUX DE FIBRES DE CARBONE ET FOUR RÉSISTANT AUX FLAMMES

Publication

EP 4123065 A1 20230125 (EN)

Application

EP 21770941 A 20210317

Priority

  • JP 2020047320 A 20200318
  • JP 2021010787 W 20210317

Abstract (en)

The present invention aims at efficient production of high quality oxidized fiber bundles and carbon fiber bundles. A production method for an oxidized fiber bundle comprising a step for heat-treating aligned acryl based fiber bundles in an oxidizing atmosphere while turning them back on guide rollers installed on both ends outside the furnace body of a hot gas heating type oxidation furnace wherein: supply nozzles for supplying hot gas into a heat treatment chamber are installed at an end in the traveling direction of the acryl based fiber bundles; a fiber bundle traveling passage(s) exists above and/or below each nozzle; hot gas is supplied from the supply face(s) located above and/or below the acryl based fiber bundle; and the requirements (1) and (2) are satisfied where Vf is the gas flow speed in a substantially parallel direction to the traveling direction of the acryl based fiber bundle in the fiber bundle traveling passage and V is the gas flow speed in a substantially parallel direction to the traveling direction of the acryl based fiber bundle in the heat treatment chamber. 1.5m/s≤Vf≤15m/s1.5m/s≤V≤10m/s

IPC 8 full level

D01F 9/22 (2006.01)

CPC (source: EP KR US)

D01F 9/22 (2013.01 - EP); D01F 9/225 (2013.01 - KR); D01F 9/328 (2013.01 - EP US); D02J 13/005 (2013.01 - US); D10B 2101/12 (2013.01 - US)

Designated contracting state (EPC)

AL AT BE BG CH CY CZ DE DK EE ES FI FR GB GR HR HU IE IS IT LI LT LU LV MC MK MT NL NO PL PT RO RS SE SI SK SM TR

Designated extension state (EPC)

BA ME

Designated validation state (EPC)

KH MA MD TN

DOCDB simple family (publication)

EP 4123065 A1 20230125; CN 115279958 A 20221101; CN 115279958 B 20240416; JP WO2021187518 A1 20210923; KR 20220146497 A 20221101; US 2023119738 A1 20230420; WO 2021187518 A1 20210923

DOCDB simple family (application)

EP 21770941 A 20210317; CN 202180020548 A 20210317; JP 2021010787 W 20210317; JP 2022508405 A 20210317; KR 20227030744 A 20210317; US 202117910870 A 20210317