Method for the direct backfoaming of absorber systems

Abstract

The invention relates to a method for producing mass absorber systems, sound insulations having a great thermostable, noise-reducing effect, especially for the engine compartment of motor vehicles. Disclosed is a method for the direct backfoaming of absorber systems, the absorber of which comprises a foam layer ( 2 ) or fleece layer ( 4 ) with a one-sided or double-sided covering layer ( 3 ). Said method is characterized by the fact that the mass side of an absorber having a very low density is provided with a foam-impermeable covering layer ( 3 ), the absorber is placed in the foaming tool, and a certain pressure is generated in the absorber via the side located opposite the mass inside the closed foaming tool before the foaming process is triggered.

1 . A process for the direct foam-backing of absorber systems in which the absorber consists of a foam layer or non-woven layer with a cover layer on one or both sides, characterized in that an absorber with a very low density is provided with a foam-impermeable cover layer on the mass side, the absorber is positioned within the foaming mold, and a pressure is built within the absorber from the side facing away from the mass in the closed foaming mold, before the foaming process is initiated.  
   
   
       2 . The process according to  claim 1 , characterized in that a medium in a gaseous state of matter is employed as a pressure-applying medium.  
   
   
       3 . The process according to  claim 2 , characterized in that a pressure of from 0.5 bar to 7 bar is built within the absorber by means of a medium in a gaseous state of matter.  
   
   
       4 . The process according to  claim 1 , characterized in that a non-woven material or a plastic sheet is employed as the foam-impermeable cover layer on the mass side.  
   
   
       5 . The process according to  claim 1 , characterized in that an open-pore or mixed-cell foam with a density of foam of from 5 kg/m 3  to 38 kg/m 3  is employed as the absorber.  
   
   
       6 . The process according to  claim 1 , characterized in that a foam-molded cold foam having a foam-impermeable cover layer on the heavy layer side is employed as the absorber.  
   
   
       7 . The process according to  claim 6 , characterized in that a foam-molded cold foam with a density of foam of from 35 kg/m 3  to 190 kg/m 3  is employed as the absorber.  
   
   
       8 . The process according to  claim 1 , characterized in that a non-compressed non-woven material with a foam-impermeable cover layer on the mass side is employed as the absorber.  
   
   
       9 . The process according to  claim 1 , characterized in that the pressure to be built inside the absorber prior to the foam-backing process is controlled and/or regulated by valves.  
   
   
       10 . The process according to  claim 1 , characterized in that the pressure to be built inside the absorber prior to the foam-backing process is defined, controlled and adjusted by valves during the whole foaming process.  
   
   
       11 . The process according to  claim 1 , characterized in that the pressure to be built within the absorber before the foam-backing process, is controlled and adjusted from the side facing away from the mass within the foaming mold with a partially different intensity by a segment construction of the foaming mold part facing away from the mass.  
   
   
       12 . An absorber system in which the absorber consists of a foam layer or non-woven layer with a cover layer on one or both sides, and a foam layer which is obtained by the process according to  claim 1.