Birch, Stewart, Kolasch & Birch, LLP
Aromatic polyamide filament and method of manufacturing the same
Disclosed are wholly aromatic polyamide filament and a method of manufacturing the same, characterized by comprising multi-stage injection of a coagulant with sulfuric acid concentration lowered sequentially stage by stage, to a spun material fed into a coagulant injection tank. The present invention enables increase of a spinning and take-up velocity without occurrence of thread cutting by uniformly and evenly coagulating surface and inside of the spun material. In addition, the present invention recovers the coagulant or water already used and reuses the recovered coagulant or water in the earlier stages, so that it has advantages of saving production costs and reducing environmental contamination. Accordingly, the wholly aromatic polyamide filament produced according to the present invention has high crystallinity X, large apparent crystal size ACS and reduced defects in the crystal itself, thereby exhibiting more improved physical properties such as strength and modulus.
Kolon Industries, Inc.
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D01F Y10T Y02P Y10T D01D
inventional additional additional additional inventional
In-Sik So-Yeon Jae-Young Seung-Hwan Jae-Young
Han Kwon Kim Lee Lee