Material for absorbing noise in aircraft

Details Material for absorbing noise in aircraft Material for absorbing noise in aircraft

2011-05-24

2011-05-24

Barefoot, Galen (Department: 3643)

Aeronautics and astronautics

Miscellaneous

C244S133000, C181S294000

Reexamination Certificate

active

07946525

ABSTRACT:
The invention relates to a material for absorbing noise in aircraft, comprising at least one barrier layer and at least one absorptive layer. The barrier layer is provided with an elastomeric material having a minimum specific density of 1 and a mass per unit area of 1.3 kg/m2or less while the absorptive layer is equipped with a porous and/or open-cell material having a weight per volume of 4 to 50 kg/m3, preferably 10 to 40 kg/m3, more preferably 15 to 35 kg/m3even more preferably 20 to 30 kg/m3. The mass per unit area of the sound-absorbing material amounts to 2 kg/m2or less.

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