Ultralight trim composite

G - Physics – 10 – K

Patent

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Details

G10K 11/168 (2006.01) B32B 5/18 (2006.01) B32B 7/02 (2006.01) B32B 27/28 (2006.01) B32B 27/30 (2006.01) B32B 27/32 (2006.01) B32B 27/34 (2006.01) B60R 13/08 (2006.01)

Patent

CA 2505891

An ultra light, noise reducing composite (1) comprises an acoustically transparent, light weight film (6) between an underlay layer (5) and an air flow resistance layer (4). This composite allows to easily tune the acoustic properties by balancing the absorption and sound transmission behaviour of the composite (1). This air flow resistance layer (4) has an air flow resistance of between 500N s/m3 and 10'000Ns/m3 and an area mass between 200 g/m2 and 3'000 g/m2. The underlay layer (5) has a stiffness value in the range between 100 Pa and 100'000 Pa. The light weight film (6) may consist of a synthetic foil and preferably has a thickness of 0.01 mm.

L'invention concerne un composite réducteur de bruit ultraléger (1) qui comprend un film léger à transparence acoustique (6) entre une couche sous-jacente (5) et une couche de résistance au flux d'air (4). Le composite assure un réglage facile des propriétés acoustiques par équilibrage de l'absorption et de la transmission du son dans le composite (1). La couche (4) a une résistance au flux d'air comprise entre 500 N s/m3 et 10 000 Ns/m3 et une masse surfacique comprise entre 200 g/m2 et 3'000 g/m2. La couche (5) a une rigidité comprise entre 100 Pa et 100'000 Pa. Le film (6) peut être en feuille synthétique, de préférence avec une épaisseur de 0,01 mm.

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