Patent ID: 7931843
Filing Date: 2011-04-26
Classification: D01F,Y10T

Abstract:
1. A process for producing a polyphenylene sulfide multifilament yarn comprising: feeding a melt of polyphenylene sulfide to a spinning device; extruding the melt through a spinneret with a plurality of spinneret holes to form a filament bundle with a plurality of filaments; subjecting the filament bundle to a passive cooling stage, which includes passing the filament bundle through a perforated or porous tube or passing the filament bundle between perforated or porous panels for a time period of between 0.1 s to 0.3 s after the filament bundle leaves the spinneret; subjecting the filament bundle to an active cooling stage; drawing the filament bundle after subjecting the filament bundle to the passive cooling stage and the active cooling stage; and winding the filaments after solidifying and the drawing.