Acoustics – Sound-modifying means – Sound absorbing panels
Patent
1991-02-20
1993-11-02
Gellner, Michael L.
Acoustics
Sound-modifying means
Sound absorbing panels
181290, 181291, 181294, 4283166, 4283171, 4283175, 4283177, 428288, E04B 182
Patent
active
052585859
ABSTRACT:
An insulating laminate, which is particularly suitable for a sound attenuating barrier, such as a contoured vehicle headliner. The disclosed embodiment includes a finish lamina, which may be preferably cloth-like, and a substrate which is preferably structurally stable and self supporting and which may be adapted to absorb sound primarily at predetermined higher frequencies. In one preferred embodiment, a thin flexible film is located between the finish lamina and the substrate which is adapted to absorb sound primarily at relative lower predetermined frequencies. The film may include a pattern of openings or holes designed to absorb sound primarily at predetermined lower frequencies. In the disclosed embodiment, the substrate includes a porous fiber mat, preferably including fibers having a range of thicknesses to improve sound attenuation at higher frequencies, a structural foam lamina and a reinforcing scrim, preferably comprising spunbonded polyester filaments.
REFERENCES:
patent: 4129672 (1978-12-01), Momura et al.
patent: 4247586 (1981-01-01), Rochlin
patent: 4263356 (1981-04-01), Nomura et al.
patent: 4418108 (1983-11-01), Lin
patent: 4476183 (1984-10-01), Holtrop et al.
patent: 4695501 (1987-09-01), Robinson
patent: 4944992 (1990-07-01), Yoneshige et al.
patent: 5007976 (1991-04-01), Satterfield et al.
Dang Khanh
Gellner Michael L.
Indian Head Industries Inc.
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