Cellulose fiber for using as industrial materials

Abstract

The present invention relates to cellulose fiber containing 500 to 2000 of filaments and having homogeneous physical properties and the multi-filaments according to the present invention is characterized in that the strength and the breaking elongation of the multi-filaments are 4 to 9 g/d and 4 to 15%, respectively. In particular, the present invention is characterized in that each mono-filament selected 100 strands from every three part divided from multi-filaments has properties as following: (a) 3 to 9 g/d in average strength, 7 to 15% in average breaking elongation and 0.035 to 0.055 in by birefringence, (b) the differences of the above three parts are below 1.0 g/d in average strength, 1.5% in breaking elongation and 0.7 denier in denier, (c) the CV (%)(coefficient of variation) of the above three parts are below 10%, and (d) the birefringence differences of the above three parts are below 0.004.

1 . A cellulose fiber for using industrial materials produced by a method comprising the steps: 
 (A) producing a cellulose solution by swelling and homogenizing a cellulose powder into an aqueous concentrated N-methyl morpholine N-oxide (NMMO) solution;    (B) obtaining a multi-filaments by spinning said cellulose solution with a spinning nozzle having 500 to 2000 orifices and subsequently precipitating said the cellulose solution into a coagulating bath through an air gap; and    (C) water-washing, drying, treating with a finishing oil and winding said multi-filaments, and is characterized in having following physical properties; 
 (1) 700 to 3000 in denier of original strands;  
 (2) 4 to 9 g/d and 4 to 15% in strength and breaking elongation of the multi-filaments, respectively;  
 (3) said multi-filaments are divided into three parts and 100 mono-filaments selected from each part of said three parts has following physical properties; 
 a) 3 to 9 g/d in strength, 7 to 15% in breaking elongation and 0.035 and 0.055 birefringence, respectively;  
 b) the differences of average strength, average breaking elongation and average denier are less than 1.0 g/d, 1.5% and 0.7 denier, respectively;  
 c) CV (coefficient of variation) of average strength, average breaking elongation and denier of said three parts less than 10%; and  
 d) The differences of average birefringence of said three parts are less than 0.004.  
 
   
   
   
       2 . The cellulose fiber according to  claim 1 , wherein the nozzle further comprises a distributing plate having 50 to 300 holes.  
   
   
       3 . The cellulose fiber according to  claim 1 , wherein an air being 5 to 30° C. in temperature and 10 to 60% in humidity is blown into the air gap at 3 to 12 m/sec air speed.  
   
   
       4 . The cellulose fiber according to  claim 1 , wherein the temperature of the coagulating bath is 0 to 35° C.  
   
   
       5 . The cellulose fiber according to  claim 1 , wherein said drying is performed with a drying roller being 80 to 170° C. in temperature.  
   
   
       6 . A tire cord comprising the cellulose fiber according to  claim 1.