Patent ID: 6780358
Filing Date: 2004-08-24
Classification: D01F,Y10T

Abstract:
A manufacturing method for polyester yarn excellent in yarn transferring and filament packaging with no white powder occurred when weaving, which is heating polyester polymer of inherent viscosity (IV) 0.5Ëœ0.7 and melting point of 245Ëœ265Â° C. to melt, filter and extruding in constant amount by direct spin drawing of monofilament yarn or combining multi-tow of filaments, then splitting to obtain polyester yarn having high denier in monofilament, characterized in comprising the following steps:a. uniformly spinning said constant amount extruded polyester melt through spinneret orifices to obtain the filament tows, passing said spun filament tows under spinneret to uniformly cooled to solidify in the quenching air tube, wherein said quenching air tube is equipped with chilling water tubular coil to keep the temperature of quenching air at 10Ëœ15Â° C.; b. oiling said cooled filament tows, then texturing by the godet roller of direct spin drawing machine, wherein the surface of said godet roller are treated by chrome plating to make the surface roughness of first heating roller in Ra0.025 to 0.1 &mgr;m and the surface roughness of second heating roller in Ra0.1 to 0.5 &mgr;m; c. drawing said filament tows between said first heating roller and second heating roller with drawing ratio of 3.5Ëœ5 times on the basis of the initial length of said filament tows, the temperature of said first heating roller was set at 85Ëœ105Â° C., while the temperature of said second heating roller was set at 130Ëœ160Â° C.; d. obtaining spin drawing yarn (SDY) of d.p.f. 5 dËœ55 d by using said conditions, EO/PO (ethylene oxide/propylene oxide) content of spinning finish in oiling is set at 50%Ëœ90%.