Sealed thin-multi-layer sound absorber
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United States of America Patent
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Mar 16, 2010
Grant Date -
Oct 23, 2008
app pub date -
Apr 4, 2006
filing date -
Apr 4, 2005
priority date (Note) -
Expired
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Abstract
The invention relates to a thin sound absorbing multi-layer assembly, which is intended, in particular, to reduce interior or exterior noise of a motor vehicle. The assembly according to the invention comprises at least three stacked layers consisting respectively of: a first layer (4) being impervious and having an area weight of between (20) to (100 g/m2); a second layer (3) having an air flow resistance of between (250) to (2500 Ns/m3) and an area weight of between (15) to (250 g/m2); a third layer (2) being an open pored, acoustic spring type layer having a thickness of between (2) to (30 mm) and an area weight of between (50) to (1000 g/m2).
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