Method of dry-spinning para-aramid fiber
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United States of America Patent
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May 22, 2018
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app pub date -
Dec 19, 2013
filing date -
Dec 28, 2012
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Abstract
The present invention provides a method for manufacturing para-aramid fibers, which includes: spinning a polymeric solution containing aramid polymer in an organic solvent through a spinneret into an inert gas to partially remove the organic solvent contained in the spun fiber; contacting the spun fiber with conditioning solution, so as to maintain residual water in fiber in a range of 10 to 15%; and subjecting the treated fiber to drawing, washing and heating in a dry-spinning manner. The present invention may greatly reduce energy consumption and costs for recovery of the solvent, as compared to a conventional manufacturing method of aramid fiber in a wet-spinning manner. Further, the present invention may solve conventional problems such as corrosion of apparatus, deterioration of working environments, or the like, since a concentrated sulfuric acid solvent is not used in a spinning process. Still further, the present invention may conduct drawing and heating after maintaining the residual water in fiber in a range of 10 to 15% before drawing, thereby remarkably improving the strength and elastic modulus of the fiber.
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