Acoustically effective nonwoven material for vehicle liners

Abstract

An acoustically effective nonwoven for linings of motor vehicles comprises a porous fibrous skeleton made of coarse fibers ( 8 ). These coarse fibers ( 8 ) comprise in particular staple fibers or spun-bonded fibers. A continuously changing weight quota of melted-on microfibrous material ( 7 ) is foreseen in a front and/or rear surface region ( 4 ). This melted-on microfibrous material ( 7 ) clings to the coarse fibers ( 8 ) and bonds these in such a manner that the nonwoven has a predetermined airflow resistance and is stiffened at least in its surface region ( 4 ). The airflow resistance in the surface region ( 4 ) has a value of between 200-60000 Nsm −3 , in particular between 800-35000 Nsm −3 , preferably between 1000-20000 Nsm −3 , and mainly about 1400 Nsm −3 . The bending stiffness of this fibrous nonwoven has a value of between 0.005 and 10 Nm, and in particular a value of between 0.25 and 6.0 Nm.

1 . Acoustically effective nonwoven ( 1 ) for linings of motor vehicles, comprising a porous fibrous skeleton ( 2 ) made of coarse fibers ( 8 ), in particular comprising staple fibers or spunbonded fibers, and which fibrous skeleton ( 2 ) has a continuously changing weight quota of melted on microfibrous material ( 7 ) in a front and/or rear surface region ( 4 ,  10 ), said melted on microfibrous material ( 7 ) clinging to the coarse fibers ( 8 ) and bonding these in such a manner that the nonwoven ( 1 ) has a predetermined air flow resistance and is stiffened at least in its surface region ( 4 ,  10 ).  
   
   
       2 . Nonwoven according to  claim 1 , wherein the coarse fibers ( 8 ) have a titre of more than 1 dtex, in particular in the range of 1 to 35 dtex, and preferably a titre of 6 to 17 dtex.  
   
   
       3 . Nonwoven according to  claim 1 , wherein the coarse fibers ( 8 ) are spunbonded fibers and in particular are made of a polyester, a polypropylene or a polyamide, and preferably are made of PET.  
   
   
       4 . Nonwoven according to  claim 1 , wherein said nonwoven ( 1 ) comprises non-melted on microfibers ( 9 ).  
   
   
       5 . Nonwoven according to  claim 4 , wherein the non-melted on microfibers ( 9 ) have a titre in the range of 0.01 to 1.0 dtex, preferably a titre of 0.1 to 0.6 dtex and typically a titre of around 0.2 dtex.  
   
   
       6 . Nonwoven according to  claim 1 , wherein the microfibrous material ( 7 ) is a meltblown fibrous material, in particular is made of a polyester, a co-polyester, a polyamide, a co-polyamide, a polypropylene, a co-polypropylene or similar, and preferably is made of PET or Co-PET.  
   
   
       7 . Nonwoven according to  claim 1 , wherein the coarse fibers ( 8 ) have a higher melting point than the microfibrous material ( 7 ).  
   
   
       8 . Nonwoven according to  claim 1 , wherein the air flow resistance in the surface region ( 4 ) of the fibrous nonwoven ( 1 ) has a value of between 200 to 5000, in particular 800 to 2500 and preferably 1400 Nsm −3 .  
   
   
       9 . Nonwoven according to  claim 1 , wherein the bending stiffness (B) of the fibrous nonwoven ( 1 ) has a value of between 0.005 and 10 Nm and in particular has a value of between 0.025 to 6.0 Nm.  
   
   
       10 . Nonwoven according to  claim 1 , wherein said nonwoven is combined with at least one further nonwoven.  
   
   
       11 . Nonwoven according to  claim 1 , wherein said nonwoven is provided with an air impermeable layer.  
   
   
       12 . Nonwoven according to  claim 1 , wherein said nonwoven is provided with a decorative layer.