Soundproofing device for e.g. boot soundproofing screen of motor vehicle, has aspect layer comprising sealed film associated with non-woven fabric by punching, where non-woven fabric is passed through openings of film

摘要

The device (1) has an aspect layer (2) associated with an acoustic absorption volume (3) for resisting the air passage lower than air passage resistance of the aspect layer. The aspect layer has a sealed film (4) associated with a non-woven fabric (5) by punching, where non-woven fabric is passed through openings (6) of film. The absorption volume is made of a porous sub-layer and a cavity realized in a rigid and closed structure by the gripped aspect layer having a surface density ranging between 50 and 150 grams per square meter.