Lyocell crimped fiber

Abstract

Disclosed is a lyocell crimped fiber manufactured by crimping a lyocell multi-filament. The lyocell multi-filament is manufactured by spinning a lyocell spinning dope containing a cellulose pulp and an N-methylmorpholine-N-oxide (NMMO) aqueous solution. The lyocell crimped fiber has a blooming index of 800 to 2,000.

1 . A lyocell crimped fiber manufactured by crimping a lyocell multi-filament, the lyocell multi-filament being manufactured by spinning a lyocell spinning dope containing a cellulose pulp and an N-methylmorpholine-N-oxide (NMMO) aqueous solution, the lyocell crimped fiber having a blooming index of 800 to 2,000, which is defined by the following Equation 1:
   Blooming index=blooming factor ( BF )×crimp number ( CN ) per inch,  (Equation 1)
   where the blooming factor is defined by the following Equation 2:
   Blooming factor={(change in width of fiber before and after permanent deformation)÷(change in length of fiber before and after permanent deformation)}×100.  (Equation 2)
 
   
     
     
         2 . The lyocell crimped fiber of  claim 1 , wherein the lyocell spinning dope includes 6 to 16 wt % of the cellulose pulp and 84 to 94 wt % of the N-methylmorpholine-N-oxide aqueous solution based on a total weight of the spinning dope. 
     
     
         3 . The lyocell crimped fiber of  claim 2 , wherein the cellulose pulp has an alpha-cellulose content of 85 to 97 wt % based on a total weight of the cellulose pulp, and has a degree of polymerization (DPw) of 600 to 1700. 
     
     
         4 . The lyocell crimped fiber of  claim 1 , wherein the crimp number per inch is 25 to 39/inch and the blooming factor defined by the Equation 2 is 30 to 50 in the lyocell crimped fiber. 
     
     
         5 . The lyocell crimped fiber of  claim 1 , wherein the lyocell multi-filament includes lyocell mono-filaments having a tensile strength of 2.0 to 3.5 g/d. 
     
     
         6 . The lyocell crimped fiber of  claim 5 , wherein the lyocell mono-filaments have a fineness of 1.0 to 8.0 denier. 
     
     
         7 . The lyocell crimped fiber of  claim 5 , wherein the lyocell mono-filaments have a ductility of 5 to 13%.