Filter tow

Abstract

Abstract of the Disclosure The invention relates to a filter tow made from crimped endless cellulose acetate filaments, whereby the filaments form at least two connected fibre bundles with the same filament titre of at least 600 filaments. The filament titres differ from bundle to bundle by at least 1 dtex Furthermore a filter tow is disclosed with a crimp ratio of more than 40%, said filaments comprising at least 22 crimp turns per filament length.

1.  A filter tow of crimped, continuous cellulose acetate filaments, wherein the filaments form at least two coherent fiber bundles of the same filament dernier of at least 600 filaments which differ from fiber bundle to fiber bundle in their filament dernier by at least 1 dtex. 
   
   
       2.  The filter tow of  claim 1 , wherein the filaments form more than five coherent fiber bundles of the same filament dernier. 
   
   
       3.  The filter of  claim 1  or  2 , wherein the individual fiber bundles contain more than 1000 filaments. 
   
   
       4.  The filter tow of one of  claims 1  to  3 , wherein the filament derniers of the filaments differ from fiber bundle to fiber bundle by more than 1.5 dtex. 
   
   
       5.  The filter tow of one of  claims 1  to  4 , wherein the crimp ratio is greater than 33%, and the number of crimps per cm is greater than 15. 
   
   
       6.  The filter tow of one of  claims 1  to  5 , wherein the crimp ratio is greater than 35% 
   
   
       7.  The filter tow of one of the above claims, wherein the crimp ratio is greater than 40%, preferably greater than 42%, and the number of crimps per cm exceeds a value of 22. 
   
   
       8.  The filter tow of crimped, continuous cellulose acetate filaments, wherein the filter tow has a crimp ratio of greater than 40% and the filaments have at least 22 crimps per cm filament length. 
   
   
       9.  The filter tow of  claim 8 , wherein the crimp ratio is greater than 42% and the filaments have more than 25 crimps per cm. 
   
   
       10.  The filter tow of  claim 8  or  9 , wherein the filament dernier is greater than 3.3 dtex, and the total dernier is less than 44,000 dtex, preferably less than 40,000 dtex.