Method and an apparatus for strengthening yarns

Abstract

A method and an apparatus for strengthening a yarn ( 6 ) is described which is provided with fibers at least in a sheath zone enclosing a core zone. In order to provide advantageous process conditions it is proposed that fibers are needled from the sheath zone through the core zone along the yarn ( 6 ).

1 . A method for strengthening a yarn which is provided with fibers at least in a sheath region enclosing a core zone, with fibers from the sheath zone being needled through the core zone along the yarn.  
     
     
         2 . A method according to  claim 1 , wherein fibers from at least one fiber sheath wound about a yarn core are needled through the yarn core.  
     
     
         3 . An apparatus for performing the method according to  claim 1  or  2  with at least one needle board which is reciprocatingly drivable in the needle-penetration direction, with the stitch base ( 1 ) being provided with at least one guide groove ( 5 ) for the yarn ( 6 ) extending in the direction of passage and the needles ( 4 ) of the needle board ( 2 ) penetrating the guide groove ( 5 ).  
     
     
         4 . An apparatus according to  claim 3 , wherein the stitch base ( 1 ) comprises several parallel guide grooves ( 5 ) for one yarn ( 6 ) each.  
     
     
         5 . An apparatus according to  claim 3  or  4 , wherein the guide groove ( 5 ) or the guide grooves ( 5 ) are provided upstream and/or downstream with guide eyes ( 9 ) for the yarn ( 6 ) or yarns ( 6 ).  
     
     
         6 . An apparatus according to one of the  claims 3  to  5 , wherein the stitch base ( 1 ) extends at least on the inlet and outlet side in a convexly curved manner in the direction of the guide groove ( 5 ) or guide grooves ( 5 ).