D - Textiles – Paper – 01 – F
Patent
D - Textiles, Paper
01
F
18/6
D01F 9/14 (2006.01) D01F 9/145 (2006.01) D01F 9/32 (2006.01)
Patent
CA 1225805
ABSTRACT OF THE DISCLOSURE The oxidation of carbon fibers from pitch is carried out directly by winding the spun fiber on to a spinning spool or bobbin, said spool comprising an open ended, porous, non-expanding or collapsible spool. The spun carbon fibers are wound on such a spinning spool so as to leave open areas between fiber bundles. A mixture of an inert gas such as air or nitrogen con- taining a minor amount of oxygen is used as the oxi- dizing gas. Oxidation is carried out in a closed zone, e.g. an oven, for a period of time of at least 4 hours at a temperature that is initially below the glass transition temperature of the carbon fibers and is slowly increased over the oxidation time to a maximum of about 340°C. The gaseous oxidation atmosphere is continuously recycled and passed through the spool to ensure that the fibers are essentially completely oxidized.
460184
E. I. Du Pont de Nemours And Company
Mccallum Brooks & Co.
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