Patent ID: 7322440

Claim:
An ultralight trim composite ( 1 ) comprising a first acoustically effective layer ( 4 ) and a second underlay layer ( 5 ), characterized in that for the balancing of the absorption and sound transmission behaviour of the composite, the first acoustically effective layer ( 4 ) has an air flow resistance R between 500 Ns/m 3 and 10,000 Ns/m 3 and has an area mass m A between 200 g/m 2 and 3,000 g/m2, the second underlay layer ( 5 ) has a very low compression force deflection modulus, i.e. a stiffness value S D in the range between 100 Pa and 100,000 Pa and in addition comprises an acoustically transparent, very thin and light weight film ( 6 ) between the second underlay layer ( 5 ) and the first acoustically effective layer ( 4 ), which film interacts with this underlay layer ( 5 ) in the manner of an acoustic foil absorber ( 9 ).