METHOD FOR PRODUCING CARBON-FIBER BUNDLES

Title:

METHOD FOR PRODUCING CARBON-FIBER BUNDLES

Document Type and Number:

WIPO Patent Application WO/2012/014892

Kind Code:

A1

Abstract:

Provided is a highly productive method for producing carbon-fiber bundles without deteriorating the quality of the carbon-fiber during the production process. Specifically provided is a method for producing carbon-fiber bundles involving a flame-proofing step, a pre-carbonization step, and a carbonization step, wherein: when P1 represents the travelling pitch of a fiber bundle during the flame-proofing step, P2 represents the travelling pitch of the fiber bundle during the pre-carbonization step, and P3 represents the travelling pitch of the fiber bundle during the carbonization step, the equation 0.8≤P2/P1≤1.0 and 0.4≤P3/P1≤0.8 is satisfied; when P11 represents the travelling pitch of the fiber bundle at the inlet of the heating processing section of a pre-carbonization furnace and P12 represents the travelling pitch of the fiber bundle at the outlet of the heating processing section of the pre-carbonization furnace, the equation 0.40≤(P12/P11)≤0.90 is satisfied; and when P13 represents the travelling pitch of the fiber bundle at the inlet of the heating processing section of a carbonization furnace and P14 represents the travelling pitch of the fiber bundle at the outlet of the heating processing section of the carbonization furnace, the equation 0.40≤(P14/P13)≤0.90 is satisfied.

Inventors:

TOKORO YASUHITO (JP)
KOTANI TOMOYUKI (JP)

Application Number:

PCT/JP2011/066965

Publication Date:

February 02, 2012

Filing Date:

July 26, 2011

Export Citation:

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Assignee:

MITSUBISHI RAYON CO (JP)
TOKORO YASUHITO (JP)
KOTANI TOMOYUKI (JP)

International Classes:

D01F9/32

Foreign References:

JP2003055843A	2003-02-26
JPS5953719A	1984-03-28
JP2008019526A	2008-01-31
JPH0347695B2	1991-07-22

Other References: