Homogenous cellulose solution and high tenacity lyocell multifilament using the same

Abstract

The present invention relates to a method for making highly homogenized cellulose solution, wherein the cellulose solution is obtained by obtaining a solidified N-methylmorphorine-N-oxide (hereinafter, referred to as ‘NMMO’) hydrates which is solidified a liquid-state NMMO hydrates comprising 10 to 18% by weight water by using a simple screw-type feeder and by controlling the temperature, feeding the solidified NMMO into a twin-screw type extruder continuously, obtaining a cellulose solution which is fully swelled in a few minutes by dispersing and mixing with cellulose powder in the twin-screw type extruder, and extruding a highly homogenized cellulose solution by feeding the obtained cellulose solution into a melting zone of the extruder to melting the cellulose solution in a few minutes by minimum heat and shear force.

1 . A cellulose article extruded from a solution prepared continuously using a mixture of N-methylmorphorine-N-oxide (NMMO) and water, by: 
 (A) preparing solid-state NMMO by cooling liquid-state NMMO within a few seconds by using a side feeder of a twin-screw type extruder, and then, feeding the solid-state NMMO into the twin-screw type extruder;    (B) compressing and feeding cellulose powder within a few seconds by using side feeder of the twin-screw type extruder at the same time of the above step (A); and    (C) obtaining cellulose solution swelled and homogenized from the cellulose powder and solid-state NMMO by the twin-screw type extruder having a screw to be subjected dispersing, mixing, shearing, kneading, melting and measuring processes.    
   
   
       2 .- 9 . (canceled)  
   
   
       10 . A cellulose fiber manufactured by a method comprising the steps of: 
 (A) preparing solid-phase NMMO by cooling liquid-phase NMMO within 1 to 60 seconds by using a side feeder of a twin-screw type extruder, and then, feeding the solid-phase NMMO into the twin-screw type extruder, and simultaneously compressing and feeding cellulose powder within a few seconds by using side feeder of the twin-screw type extruder;    (B) obtaining cellulose solution swelled and homogenized from the fed cellulose powder and solid-phase NMMO by the twin-screw type extruder with a screw to perform dispersing, mixing, kneading, melting and measuring,    (C) expelling and spinning the cellulose solution through a spinning nozzle, and solidifying it through an aeration layer and a solidifying bath so as to obtain multi-filament; and    (D) after-treating the obtained multi-filament through washing, drying, oil-treating and winding; and wherein the cellulose fiber having some properties of (1) a tenacity of 5 to 10 g/d, (2) an elongation of 4 to 15%, (3) a modulus of 150 to 400 g/d, (4) a birefringence of 0.01 to 0.1 and (5) a shrinkage of −0.5 to 5%.    
   
   
       11 . The cellulose fiber of  claim 10 , which has a tenacity of 7 to 9 g/d.  
   
   
       12 . The cellulose fiber of  claim 10 , which has an elongation of 5 to 10%.  
   
   
       13 . The cellulose fiber of  claim 10 , which has filament of 500 to 2200.  
   
   
       14 . The cellulose fiber of  claim 10 , which has a total fineness of 250 to 4500 denier.  
   
   
       15 . The cellulose fiber of  claim 10 , which has a monofilament fineness of 0.5 to 4 denier.  
   
   
       16 . The cellulose fiber of  claim 10 , which has a shrinkage of −0.5 to 1.5%.  
   
   
       17 . The cellulose fiber of  claim 10 , which has a modulus of 200 to 350.  
   
   
       18 . The cellulose fiber of  claim 10 , the sum of the mid-elongation (%) and shrinkage (%) is less than 1 to 4.  
   
   
       19 . A tire cord obtained by using the cellulose fiber produced according to  claim 10 .  
   
   
       20 . A tire obtained by using the cellulose fiber produced according to  claim 10 .  
   
   
       21 . Belt products obtained by using the cellulose fiber produced according to  claim 10 .  
   
   
       22 . Hose products obtained by using the cellulose fiber produced according to  claim 10.