METHOD FOR PRODUCING A SOUNDPROOFING TRIM PANEL FOR THE INTERIOR OF A MOTOR VEHICLE

The invention relates to a method of producing a sound proofing trim panel comprising the steps of providing an elastically compressible lower layer, heating the lower layer and placing it in a mould to shape it to form a spring layer of a spring-mass type damping system. The method further includes associating the lower layer with an upper layer, to form the mass of the spring-mass system. According to the invention, the lower layer comprises a blend of elastically compressible foam flakes forming at least 80 wt.-% of the lower layer and being mixed with binder fibres. The fibres comprising a core and a sheath that is fusible at a moderate temperature, and the flakes being bonded to one another by means of the fusing of the sheath forming a binder, such that the lower layer takes the form of a bonded foam.