Patent ID: 8157051
Filing Date: 2012-04-17
Classification: B29C,B29K,B29L,B60R

Abstract:
1. A method for producing a moulded sound-proofing component comprising a first porous layer and a second porous layer having open cells with an intermediate layer that is practically air-tight provided therebetween, the method comprising: providing the first porous layer having a shape provided by the sound-proofing component; providing the intermediate layer on the first porous layer; and injecting a polymer foaming composition to form the second porous layer, wherein the providing the intermediate layer on the first porous layer and the injecting a polymer foaming composition are carried out simultaneously in a single injection step of the polymer foaming composition to contact the first layer during formation of a polymer composition from the polymer foaming composition and the material of the first layer, and the intermediate layer being denser than each of the first and second porous layers, wherein the providing the first layer includes providing a layer of a porous material, the porous material being selected from a felt and a foam layer, and the first porous layer consists of one porous layer having a resistance to passage of air of between 200 N·m wherein a density of the intermediate layer is lower the 666 kg/m