Method for stitch-bonding or finishing a material web by means of hidrodynamic needling, and product produced according to this method

Abstract

The aim of the invention is to subject a non-woven, which consists, at least in part, of metal fibers, to a stitch-bonding or surface finishing by means of hydrodynamic needling. The respective material web can be produced exclusively from metal fibers but can also be produced from a blend consisting of metal fibers and textile fibers. The hydrodynamic water pressure during needling depends on the desired pore volume after stitch-bonding.

1 . A method for producing a stitch-bonded material web by means of hydrodynamic needling, characterized in that a material web consisting at least partly of metal fibers or metal filaments is stitch-bonded and/or finished by means of high-energy water jets to form a material web ready to use such as cloth or the like.  
     
     
         2 . The method according to  claim 1 , characterized in that the material web is formed as woven fabric at least partly avoiding yarn formation from unspun metal fibers and such a material web is exposed to this hydrodynamic needling for finishing.  
     
     
         3 . The method according to  claim 1 , characterized in that the material web is formed as woven fabric or knitted fabric at least partly using spun yarns of metal fibers and such a material web is exposed to this hydrodynamic needling for finishing.  
     
     
         4 . The method according to  claim 1 , characterized in that textile fibers are mixed in the material web of metal fibers or filaments and both are together exposed to the hydrodynamic needling for stitch bonding or finishing.  
     
     
         5 . The method according to  claim 1 , characterized in that the material web consists of 100% metal fibers or filaments and such a material web is exposed to the hydrodynamic needling for stitch bonding or finishing.  
     
     
         6 . The method according to  claim 1 , characterized in that the hydrodynamic needling is carried out at a pressure >200 bar.  
     
     
         7 . The method according to  claim 1 , characterized in that a woven fabric, knit fabric, knitted fabric, stitch-bonded materials, stitch-bonded nonwoven, needle-punched nonwoven as material web manufactured at least partly of metal fibers or filaments are subjected to a water jet treatment to modify properties such as, for example, post-stitch bonding, density variation, smoothing, roughening etc.  
     
     
         8 . The method according to  claim 1 , characterized in that metal fibre nonwovens with woven fabrics, knit fabrics, knitted fabrics, stitch-bonded materials, stitch-bonded nonwovens, needle-punched nonwovens etc. consisting of 100% metal fibers but also of combinations of metal fibers and textile fibers are combined to form composites by means of hydrodynamic needling.  
     
     
         9 . The method according to  claim 1 , characterized in that the water jet stitch bonding is followed by a pressing and/or calibration process.  
     
     
         10 . A nonwoven characterized in that it consists at least partly of unspun metal fibers or filaments and is treated by means of hydrodynamic needling for stitch bonding.  
     
     
         11 . The nonwoven according to  claim 1 , characterized in that it consists of 100% unspun metal fibers or filaments and is treated by means of hydrodynamic needling for stitch bonding.  
     
     
         12 . The spunlace nonwoven according to  claim 10 , characterized in that the metal fibers or filaments are interlaced, entangled or hooked with one another or into one another without forming meshes.  
     
     
         13 . A spunlace nonwoven of metal fibers according to  claim 10 , characterized in that the fibers to be stitch-bonded consist of a homogeneous mixture of metal fibers and textile fibers.  
     
     
         14 . The spunlace nonwoven of metal fibers according to  claim 10 , characterized in that the fibers to be stitch-bonded are a component of laminated nonwovens wherein the laminated nonwovens are composed of two or more layers.  
     
     
         15 . The spunlace nonwoven of metal fibers according to  claim 14 , characterized in that the layers consist of metal fibers or textile fibers or in turn of homogeneous mixtures of metal fibers and textile fibers.  
     
     
         16 . The spunlace nonwoven according to  claim 10 , characterized in that no filamentous material is present.  
     
     
         17 . The spunlace nonwoven according to  claim 10 , characterized in that thread material is additionally worked in.  
     
     
         18 . The spunlace nonwoven according to  claim 10 , characterized in that additional fabrics such as, for example, knitted fabric, knit fabric, needle-punched nonwoven etc. consisting of metallic materials or textile fibrous substances are worked in or attached laterally.  
     
     
         19 . The spunlace nonwoven according to  claim 10 , characterized in that the pore volume, the pore size and the thickness is also varied by a pressing and/or calibrating process following the water jet stitch bonding.  
     
     
         20 . The spunlace nonwoven according to  claim 10 , characterized in that it has perforations as required according to a pattern.  
     
     
         21 . Woven fabric, knit fabric, knitted fabric, stitch-bonded materials, stitch-bonded nonwoven, needle-punched nonwoven etc., characterized in that a modification of properties such as, for example, post-stitch bonding, density variation, smoothing, roughening etc. has occurred as a result of an aftertreatment with high-energy water jets.  
     
     
         22 . Composites characterized in that metal fibre nonwovens are combined with woven fabrics, knit fabric, knitted fabrics, stitch-bonded materials, stitch-bonded nonwovens and/or needle-punched nonwoven etc. made of metal fibers or metal filaments in various combinations by means of hydrodynamic needling to form a composite.