Patent ID: 7690480
Filing Date: 2010-04-06
Classification: B32B,B60R

Abstract:
1. A motor vehicle having a soundproof material arranged on at least a portion of the floor within a compartment of the motor vehicle, the soundproof material comprising: a first sound absorbing layer directed toward the floor surface and a second sound absorbing layer directed toward the motor vehicle compartment, wherein the first and second sound absorbing layers have an air permeability; the density of the first sound absorbing layer is lower than that of the second absorbing layer; an intermediate layer provided between said first and second sound absorbing layers, wherein said intermediate layer has a two-layer structure of a high-density layer and a low-density layer, wherein an air permeability of said intermediate layer is lower than the air permeability of said first and second sound absorbing layers, and wherein said intermediate layer is arranged in such a manner that said high-density layer is adjacent to said second sound absorbing layer, wherein the air permeability of each of said first and second sound absorbing layers of the soundproof material is between 5 and 100 cc/cm wherein the air permeability of said intermediate layer of the soundproof material is greater than or equal to 2 cc/cm