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Process for preparing carbon fibers elliptical in section
| Details |
Inventors: Haraguchi, Kazutoshi; Tanigawa, Eiji; Nukina, Kenji; Morita, Hiroaki; Maeda, Toyohiro;
Assignee: Osaka Gas Company Limited (Osaka, JP); Dainippon Ink and Chemicals Inc. (Tokyo, JP)
Primary Examiner: Lorin; Hubert
Assistant Examiner:
Attorney, Agent or Firm: Armstrong, Nikaido, Marmelstein, Kubovcik & Murray
A process for preparing a carbon fiber having an elliptical cross section, characterized by the steps of extruding spinnable pitch from a nozzle with an orifice rectangular or otherwise shaped in cross section and having a width/height ratio of more than 1, fully relaxing the molecules orientated by the nozzle on discharge from the nozzle, effecting continuous winding-up to obtain a pitch fiber elliptical in cross section, rendering the fiber infusible and carbonizing the same. |
|
DETAILED DESCRIPTION We claim: 1.
A process for preparing a carbon fiber having an elliptical cross section and substantially free of microscopic flaws, comprising the steps of extruding spinnable pitch from a nozzle with an orifice being rectangular or non-circularly shaped in cross section and having a width/height ratio of more than 1, fully relaxing the molecules in the extruded pitch oriented by the nozzle on discharge from the nozzle, effecting continuous winding-up to obtain a pitch fiber elliptical in cross section, rendering the fiber infusible and then carbonizing said fiber.
2.
A process according to claim 1 wherein the orifice of the nozzle is rectangular or otherwise shaped in cross section and having a width/height ratio of between more than 1 and 10.
3.
A process according to claim 1 wherein the cross-sectional area of the nozzle orifice is rectangular or otherwise shaped and is 5.
times.
10.
sup.
-1 to 5.
times.
10.
sup.
-3 mm.
sup.
2.
4.
A process according to claim 1 wherein the softening point of the spinnable pitch is 280.
degree.
to 325.
degree.
C.
5.
A process according to claim 1 wherein the pitch melt is rendered infusible in an oxygen-containing atmosphere at 280.
degree.
to 440.
degree.
C.
6.
A process according to claim 1 wherein the carbonization is effected in an atmosphere of an inert gas at 1000.
degree.
to 2000.
degree.
C.
7.
A process for preparing a graphite fiber having an elliptical cross section and substantially free of microscopic flaws, comprising the steps of extruding spinnable pitch from a nozzle with an orifice being rectangular or non-circularly shaped in cross section and having a width/height ratio of more than 1, fully relaxing the molecules in the extruded pitch oriented by the nozzle on discharge from the nozzle, effecting continuous winding-up to obtain a pitch fiber elliptical in cross section, rendering the fiber infusible and then graphitizing said fiber.
8.
A process according to claim 7 wherein said graphitization is carried out in an argon atmosphere at 2000
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