Lightweight, sound-insulating lining for a body part of a motor vehicle, and method for the production thereof
First Claim
1. A lightweight sound insulating front wall lining for a body component of a motor vehicle, comprising a sound absorbing layer, a sound insulating layer which is directly connected to the sound absorbing layer and substantially air tight, as well as an adjoining foam layer, wherein the sound absorbing layer is made of a porous absorber, wherein the porous absorber has an air permeability in the range of 150 to 2000 liters/m2s at a test pressure of 100 Pa, wherein the sound insulating layer is formed by an integral skin layer of the foam layer with a thickness of at least 0.5 mm and integrally joined to the porous absorber by back-foaming the porous absorber substantially without penetration of foam, wherein the lining has on its edge a flexible sealing lip.
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Accused Products
Abstract
The invention relates to a lightweight sound insulating lining (1) for a body component of a motor vehicle, in particular in the form of a lightweight front wall lining, comprising a sound absorbing layer, a sound insulating layer which is directly connected to the sound absorbing layer and substantially air tight, as well as an adjoining foam layer (1.3), wherein the sound absorbing layer (1.1) is made of a porous absorber, preferably a fiber fleece or a foam, which has an air permeability in the range of 150 to 2000 liters/m2s at a test pressure of 100 Pa. The sound insulating layer (1.2) is formed by an integral skin layer of the foam layer (1.3) with a thickness of at least 0.5 mm, and is integrally joined to the porous absorber by back-foaming the porous absorber substantially without foam penetration therethrough. Furthermore, a method for manufacturing such a lining is disclosed.
54 Citations
23 Claims
- 1. A lightweight sound insulating front wall lining for a body component of a motor vehicle, comprising a sound absorbing layer, a sound insulating layer which is directly connected to the sound absorbing layer and substantially air tight, as well as an adjoining foam layer, wherein the sound absorbing layer is made of a porous absorber, wherein the porous absorber has an air permeability in the range of 150 to 2000 liters/m2s at a test pressure of 100 Pa, wherein the sound insulating layer is formed by an integral skin layer of the foam layer with a thickness of at least 0.5 mm and integrally joined to the porous absorber by back-foaming the porous absorber substantially without penetration of foam, wherein the lining has on its edge a flexible sealing lip.
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16. A method for manufacturing a lightweight sound insulating front wall lining for a body component of a motor vehicle, wherein a porous sound absorbing layer is directly back-foamed with a reactive mix containing polyol and isocyanate in a foaming mold wherein as a porous sound absorbing layer an absorber is used which has an air permeability in the range of 150 to 2000 liters/m2s at a test pressure of 100 Pa, wherein the reactive mix is fed into the foaming mold substantially parallel to at least one of the backside of the sound absorbing layer and the bottom surface of a cavity of the foaming mold, and wherein a foam layer results from the reactive mix due to at least one of the following two steps:
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(1) a predetermined portion of the surface of the foaming mold is temperature-controlled, and (2) the mixture ratio of polyol to isocyanate is altered during feeding wherein said foam layer has a substantially air-tight, integral skin layer with a thickness of at least 0.5 mm which is firmly bonded to the sound absorbing layer substantially without foam penetration therethrough, wherein the reactive mix is injected into the closed foaming mold using a deviating device, wherein the deviating device forces the reactive mix into an injection flow direction directed substantially parallel to the backside of the porous sound absorbing layer. - View Dependent Claims (17, 18, 19, 20, 21, 22, 23)
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Specification