Rieter Technologies Ag

Karim Bouteraa

Alexander Wildhaber

Phillippe Pierre Godano

Jan Horak

Tommy Goran Falk

Gabriele Tocchi

Bertrand Francois Delmas

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 () being impervious and having an area weight of between (20) to (100 g/m2); a second layer () 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 () 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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Jambville, France

Karim Bouteraa