Filler cord and method for its production

Abstract

What is described is a filler cord, which comprises a core of (i) paper and (ii) other swellable flat or round filler materials, swellable nonwovens, and/or swellable yarns; optionally a swellable nonwoven as a covering around the core; and, to secure the core, which may or may not have a covering, a swellable yarn, which is wrapped around the core, as well as a method for the production of same.

1 . A filler cord comprising a core of (i) paper and (ii) other swellable material selected from the group consisting of swellable flat or round filler materials, swellable nonwovens, swellable yarns, and mixtures thereof; a swellable yarn, which is wrapped around the core, to secure the core. 
     
     
         2 . A filler cord according to  claim 1 , wherein the paper comprises a grammage in the range of 5-70 g/m 2 . 
     
     
         3 . A filler cord according to  claim 1 , which comprises a swellable nonwoven as a covering around the core of (i) paper and (ii) other swellable flat or material. 
     
     
         4 . A filler cord according to  claim 1  or  claim 2 , wherein the ratio of (i) paper to (ii) the other swellable material is in the range of 20:80 to 60:40, based on weight. 
     
     
         5 . A filler cord according to  claim 1 , 20-100% of which consists of materials which swell on contact with water. 
     
     
         6 . A filler cord according to  claim 1 , wherein the filler cord comprises a diameter of 4-140 mm. 
     
     
         7 . A method for producing a filler cord according to  claim 1 , wherein the method comprises the following steps:
 (1) pulling a mixture of (i) paper in the form of strips and (ii) the other swellable through a die; and then   (2) securing the diameter thus obtained by wrapping with the swellable yarn, which is wrapped around the core, to secure the core.   
     
     
         8 . A method according to  claim 7 , wherein, before the mixture is pulled through the die, a swellable nonwoven is laid around the strand of (i) paper and (ii) the other swellable and then the structure thus obtained is secured with the swellable yarn, which is wrapped around the core, to secure the core. 
     
     
         9 . A cable comprising a filler cord according to  claim 1 . 
     
     
         10 . A cable according to  claim 9 , wherein the filler cord is arranged in the longitudinal direction of the cable in such a way that it fills up empty spaces in the cable. 
     
     
         11 . A cable according to  claim 10 , wherein empty spaces in the cable are formed between cable strands in the cable and a separating layer, which surrounds the cable strands. 
     
     
         12 . A filler cord according to  claim 6 , wherein the filler cord comprises a diameter of 8-80 mm.