Title:
METHOD FOR MANUFACTURING CARBON FIBER BUNDLE
Document Type and Number:
WIPO Patent Application WO/2021/200061
Kind Code:
A1
Abstract:
This method for manufacturing a carbon fiber bundle comprises: a flameproofing step for subjecting an acrylic fiber bundle to a heat treatment within a range from 200°C to 300°C in an oxidizing atmosphere; a preliminary carbonizing step for performing a heat treatment within a range from 300°C to 1,000°C by using a heat treatment furnace having at least one inert gas supply opening on each of an incoming side and an outgoing side of the fiber bundle, and at least one discharge opening between the incoming-side and outgoing-side inert gas supply openings, the heat treatment being performed such that the temperature for supplying an inert gas is higher on the outgoing side than on the incoming side; and a carbonizing step for performing a heat treatment at temperatures from 1,000°C to 2,000°C in an inert gas atmosphere. In this method for manufacturing a carbon fiber bundle, from a position at which the atmosphere temperature within the heat treatment furnace is 300°C and that is located most toward the outgoing side in the machine length direction up to the inert gas supply opening on the incoming side, the flow of the inert atmosphere within the heat treatment furnace in the preliminary carbonizing step consists only of a flow in the parallel flow direction with respect to the fiber bundle travel direction in the machine length direction. Provided is a method for manufacturing a carbon fiber bundle with which manufacturing can be performed continuously for a long time by preventing entry into a temperature zone causing deposition of gasified decomposition products, such as tar, that are produced at the time of the preliminary carbonizing treatment during manufacturing of carbon fibers and that build up within the heat treatment furnace.
Inventors:
KATAOKA TAKUYA (JP)
HOSOTANI NAOTO (JP)
HIROSE TAKAMITSU (JP)
KUJI YUSUKE (JP)
HOSOTANI NAOTO (JP)
HIROSE TAKAMITSU (JP)
KUJI YUSUKE (JP)
Application Number:
PCT/JP2021/010303
Publication Date:
October 07, 2021
Filing Date:
March 15, 2021
Export Citation:
Assignee:
TORAY INDUSTRIES (JP)
International Classes:
D01F9/22; D01F9/32
Foreign References:
| JP2013023801A | 2013-02-04 | |||
| JP2014234557A | 2014-12-15 | |||
| JP2014234557A | 2014-12-15 | |||
| JPS6099010A | 1985-06-01 |
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