Birch, Stewart, Kolasch & Birch, LLP
Process of making wholly aromatic polyamide filament
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.
Y Y Y D D
Y02P Y10T Y10T D01F D01D
additional additional additional inventional inventional
Seung-Hwan So-Yeon Jae-Young Jae-Young In-Sik
Lee Kwon Kim Lee Han