Multi-ply sound-proofing and thermal insulation part

Abstract

The invention relates to a multilayered acoustic and thermal insulation part ( 1 ), in particular for motor vehicles, with at least one three-dimensionally structured foamed-plastic layer ( 2 ) and at least one nonwoven-fabric layer ( 3 ) lying adjacent thereto, whereby the foamed-plastic layer has a plurality of protrusions ( 4 ) and/or depressions ( 5 ). In order to be able to produce such an insulation part cost-effectively with a low weight, provision is made such that the nonwoven-fabric layer ( 3 ) is needled onto the foamed-plastic layer ( 2 ), and in such a way that the nonwoven-fabric layer lies contour-parallel next to the foamed-plastic layer and the protrusions ( 4 ) and/or depressions ( 5 ) of the foamed-plastic layer ( 2 ) are also impressed in the surface of the nonwoven-fabric layer ( 3 ) facing away therefrom. The jointing of the nonwoven-fabric layer and the foamed-plastic layer of the insulation part is thus produced without adhesive, so that costs on adhesive are saved and the weight of the insulation part is correspondingly reduced.

1 . A multilayered acoustic and thermal insulation part ( 1 ), in particular for motor vehicles, with at least one three-dimensionally structured foamed-plastic layer ( 2 ) and at least one nonwoven-fabric layer ( 3 ,  3 ′) lying adjacent thereto, whereby the foamed-plastic layer ( 2 ) has a plurality of protrusions ( 4 ) and/or depressions ( 5 ), 
 wherein  
 the nonwoven-fabric layer ( 3 ,  3 ′) is needled to the foamed-plastic layer ( 2 ) in such a way that the nonwoven-fabric layer ( 3 ,  3 ′) lies contour-parallel next to the foamed-plastic layer ( 2 ) and the protrusions ( 4 ) and/or depressions ( 5 ) of the foamed-plastic layer ( 2 ) are also impressed in the surface of the nonwoven-fabric layer ( 3 ,  3 ′) facing away therefrom.  
 
     
     
         2 . The acoustic and thermal insulation part according to  claim 1 , 
 wherein    the protrusions ( 4 ) and/or depressions ( 5 ) are arranged in grid form.    
     
     
         3 . The acoustic and thermal insulation part according to  claim 1 , 
 wherein    the protrusions ( 4 ) and/or depressions ( 5 ) are formed by profile-cutting and/or compression moulding.    
     
     
         4 . The acoustic and thermal insulation part according to  claim 1 , 
 wherein    the nonwoven-fabric layer ( 3 ) is joined with the foamed-plastic layer ( 2 ) without adhesive.    
     
     
         5 . The acoustic and thermal insulation part according to  claim 1 , 
 wherein    the foamed-plastic layer ( 2 ) is produced from open-cell foamed plastic.    
     
     
         6 . The acoustic and thermal insulation part according to  claim 1 , 
 wherein    the foamed-plastic layer ( 2 ) is produced from melamine-resin foamed plastic.    
     
     
         7 . The acoustic and thermal insulation part according to  claim 1 , 
 wherein    the nonwoven-fabric layer ( 3 ,  3 ′) is made from a spun nonwoven fabric, needle-punched nonwoven fabric and/or aluminium-fibre nonwoven fabric.    
     
     
         8 . The acoustic and thermal insulation part according to  claim 1 , whereby the foamed-plastic layer ( 2 ) has a large number of protrusions ( 4 ) and depressions ( 5 ), 
 wherein    the nonwoven-fabric layer ( 3 ,  3 ′) is needled to the foamed-plastic layer ( 2 ) in the area of the depressions ( 5 ) and lies unneedled next to the foamed-plastic layer ( 2 ) in the area of the protrusions ( 4 ).    
     
     
         9 . The acoustic and thermal insulation part according to  claim 1 , 
 wherein    the foamed-plastic layer ( 2 ) is three-dimensionally structured on both sides.    
     
     
         10 . The acoustic and thermal insulation part according to  claim 1 , 
 wherein    the foamed-plastic layer ( 2 ) is provided on both sides with a nonwoven-fabric layer ( 3 ,  3 ′).    
     
     
         11 . The acoustic and thermal insulation part according to  claim 9 , 
 wherein    the foamed-plastic layer ( 2 ) has on both sides a large number of protrusions ( 4 ) and depressions ( 5 ) and also the second nonwoven-fabric layer ( 3 ′) is needled to the foamed-plastic layer ( 2 ) in such a way that it lies contour-parallel next to the foamed-plastic layer ( 2 ) and the protrusions ( 4 ) and/or depressions ( 5 ) of the foamed-plastic layer ( 2 ) facing it are impressed in its surface.