Claims
- 1. An apparatus for air gap wet spinning an aromatic heterocyclic polymer dope through a single extrusion nozzle, comprising:
- (a) a tank with a single extrusion orifice for extruding an aromatic heterocyclic polymer dope;
- (b) means for supplying the aromatic heterocyclic polymer dope to the tank;
- (c) a coagulation bath located below the extrusion orifice with an air gap between them; and,
- (d) means for full twisting and drawing the extruded polymer dope in the air gap before the extruded polymer dope enters the coagulation bath.
- 2. The apparatus for air gap wet spinning according to claim 1, wherein the aromatic heterocyclic polymer dope is polybenzoxazole (PBO) dope.
CROSS-REFERENCE TO RELATED APPLICATIONS
This application is a division of application Ser. No. 07/671,988, filed Mar. 14, 1991, now U.S. Pat. No. 5,174,940, issued Dec. 29, 1992, which was a continuation-in-part of application Ser. No. 07/456,009, filed Dec. 22, 1989, now abandoned.
RIGHTS OF THE GOVERNMENT
The invention described herein may be manufactured and used by or for the Government of the United States for all governmental purposes without the payment of any royalty.
US Referenced Citations (24)
Foreign Referenced Citations (2)
Number |
Date |
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55-1324 |
Jan 1980 |
JPX |
63-256738 |
Oct 1988 |
JPX |
Non-Patent Literature Citations (3)
Entry |
S. Kumar and T. E. Helminiak, "Compressive Strength of High Performance Fibers", in The Materials and Science Engineering of Rigid-Rod Polymers, edited by W. W. Adams et al, Materials Research Society Symposium Proceedings, vol. 134, Pittsburgh Pa. (1989). |
S. Kumar, W. W. Adams and T. E. Helminiak, "Uniaxial Compressive Strength of High Modulus Fibers for Composites", in Journal of Reinforced Plastics and Composites, vol. 7, Mar. 1988, pp. 108-119. |
S. R. Allen, "Mechanical and Morphological Correlations in Poly(P-Phenylenebenzobisthiazole) Fibers," AFWAL-TR-83-4065, Defense Technical Information Center (DTIC) No. AD-B077601. (Jul. 1983). |
Divisions (1)
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Date |
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Parent |
671988 |
Mar 1991 |
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Continuation in Parts (1)
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456009 |
Dec 1989 |
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