Filling Fiber With Improved Opening Performance, Method For Its Production And Its Use

Abstract

The present invention relates to a process for producing a cellulosic fiber, in particular a lyocell fiber which has improved opening characteristics and therefore is particularly useful for blending with feathers, in particular with down, to such a fiber fill fiber and to the use of this fiberfill fiber in mixtures for bedding and clothing.

1 . Cellulosic filling fiber having an individual fiber titer of from 0.7 to 6.0 dtex, characterized in that it has a crimp produced in a stuffing box with a crimp count of at least 18 crimps/10 cm, as well as a finishing layer. 
     
     
         2 . Filling fiber according to  claim 1 , which has a crimp count of from 18 to 50 crimps/10 cm, preferably of from 18 to 40 crimps/10 cm. 
     
     
         3 . Filling fiber according to  claim 1  or  2 , which has a finishing layer of from 0.3 to 3.0 wt. %, referred to the total mass of the finished fiber. 
     
     
         4 . Filling fiber according to  claims 1  to  3 , wherein the finishing agent is an amino-functionalized finishing agent. 
     
     
         5 . Filling fiber according to  claims 1  to  4 , wherein the finishing agent is a silicone oil. 
     
     
         6 . Filing fiber according to  claims 1  to  5 , which has a staple fiber length of between 6 and 20 mm. 
     
     
         7 . Filling fiber according to  claims 1  to  6 , which has a blow box height ratio of between 4 and 15, preferably between 6 and 14. 
     
     
         8 . Method for the production of a cellulosic filling fiber having an individual fiber titer of from 0.7 to 6.0 dtex, consisting of the steps
 a. production of a cellulose-containing spinning solution,   b. spinning of the spinning solution into a fiber cable,   c. cable after-treatment with washing, drying, crimping and finishing, characterized in that the cable is crimped in a stuffing box to a crimp count of at least 18 crimps/10 cm and then is cut, and the cut filling fiber has a blow box height ratio between 4 and 15, preferably between 6 and 14.   
     
     
         9 . Method according to  claim 8 , wherein the finishing agent is an amino-functionalized finishing agent. 
     
     
         10 . Method according to  claim 8  or  9 , wherein the finishing agent is a silicone oil. 
     
     
         11 . Method according to  claim 8 , wherein the fiber is provided with a finishing layer of from 0.3 to 3.0 wt. %, referred to the total mass of the finished fiber. 
     
     
         12 . Method according to  claim 8 , wherein the fibers are spun in a dry-wet spinning process. 
     
     
         13 . Use of a cellulosic filling fiber having an individual fiber titer of from 0.7 to 6.0 dtex, which has a crimp produced in a stuffing box with a crimp count of at least 18 crimps/10 cm as well as a finishing layer, as filling material in bedding and clothing. 
     
     
         14 . Use of a cellulosic filling fiber according to  claim 13 , wherein the filling fiber has a blow box height ratio of between 4 and 15, preferably between 6 and 14. 
     
     
         15 . Use of a cellulosic filling fiber according to  claim 13  in mixture with downs and/or feathers. 
     
     
         16 . Use of a cellulosic filling fiber according to  claim 13  in mixture with fibers of polyester, polylactic acid, polypropylene, kapok and/or poplar down.