Sound-absorbing polymer foam molded article

Abstract

A polymer foam moulded part is described with an improved sound absorption capacity in the frequency range above 1,500 Hz, in which the improved sound absorption capacity is produced by perforating the surface compacted layer of the moulded part.

1 . Polymer foam moulded part with improved sound absorption capacity in the frequency range above 1,500 Hz, characterised by a perforation of the surface compacted layer.  
     
     
         2 . Moulded part according to  claim 1 , characterised in that the perforation consists of holes of diameter from 0.1 to 10 mm.  
     
     
         3 . Moulded part according to  claim 1  or  2 , characterised in that the perforation consists of holes of diameter from 0.3 to 3 mm.  
     
     
         4 . Moulded part according to any one of  claims 1  to  3 , characterised in that the total area of the perforations amounts to between 0.1 and 10% of the surface.  
     
     
         5 . Moulded part according to any one of  claims 1  to  4 , characterized in that the total area of the perforations amounts to between 1.5 and 4% of the surface.  
     
     
         6 . Moulded part according to any one of  claims 1  to  5  of polyurethane foam with a density of 60 to 120 kg/m 3 .