Method for producing a complex nonwoven fabric and resulting novel fabric

Abstract

The invention concerns a method for producing a complex nonwoven fabric which consists in continuously producing a complex wherein a first web of a cellulosic fibres ( 4 ) is continuously sandwiched between two webs of spunbonded filaments ( 2, 7 ), and which consists in: producing a first web of spunbonded filaments ( 2 ), the bundle of extruded and drawn filaments being received on a mobile conveyor belt ( 3 ) in the form of a non-bonded lap; depositing on said web 92 ) by airlaid process a second web of cellulosic fibres ( 4 ); depositing on the textile web ( 4 ) a second web ( 7 ) of non-bonded continuous filaments; transferring the resulting complex onto an installation ( 9 ) for water-jet bonding and hydro-entanglement consolidation; and in drying the nonwoven mixed product and then recuperating it, for example in the form of a cloth wind-up ( 18 ).

1 . A method for producing a complex nonwoven fabric which consists in continuously producing a complex in which a fibrous web ( 4 ) based on cellulosic fibers is sandwiched between two webs ( 2 ,  7 ) of continuous filaments, which method consists: 
 in producing a first web ( 2 ) of continuous filaments, the bundle of extruded and drawn continuous filaments being received on a moving conveyor belt ( 3 ) in the form of a nonbonded lap;    in depositing on this web ( 2 ), by the airlaid technique, a second web ( 4 ) of cellulosic fibers;    in depositing on the fibrous web ( 4 ) a second web ( 7 ) of nonbonded continuous filaments;    in transferring the complex thus formed onto a water-jet bonding unit ( 9 ) and in consolidating the assembly by hydro-entanglement; and    in drying the hybrid nonwoven produced and then taking it up, for example in the form of a wound package ( 18 ).    
     
     
         2 . The method as claimed in  claim 1 , characterized in that the cellulosic fibers ( 4 ) used in the production of the complex are wood fibers.  
     
     
         3 . The method as claimed in either of claims  1  and  2 , characterized in that the complex is subjected to two successive bonding treatments by water jets acting against the two opposed sides of said complex.  
     
     
         4 . A hybrid nonwoven obtained by implementing the method as claimed in one of  claims 1  to  3 , characterized in that it is composed of a ply ( 4 ) of natural fibers, especially wood fibers, trapped between two nonwoven webs ( 2 ,  7 ) consisting of continuous, extruded and drawn filaments, based on a synthetic material, the cohesion of the various plies being obtained by entanglement thanks to the action of water jets.