Acoustics – Auditorium
Patent
1975-02-07
1976-10-12
Franklin, Lawrence R.
Acoustics
Auditorium
E04B 199
Patent
active
039851982
ABSTRACT:
A sound deadening system is provided, comprising a laminate of a covering stratum of closed-cell soft foam having a bulk density of less than about 50 kp/m.sup.3, and a core stratum having cavities and joined to the covering stratum at locations spaced from one another by a distance less than about 10 times the thickness of the covering stratum, the total area of the joinders between the covering stratum and the core stratum being less than about 2/3 of the covering stratum area. The core stratum may have a honeycomb structure, such as expanded sheet metal, a closed-cell soft foam possibly in granular form, etc. The laminate may include additionally an additional covering stratum on the other side of the core stratum or even multiple layers of alternating covering and core strata. A paper sheet may be provided on the last core stratum for cementing to a surface. Reinforcements can be provided embedded in or on the back of the core stratum, e.g. a metal sheet. Expanded metal sheet can simultaneously function as core and reinforcement, permitting the laminate to be rolled in one direction for ease of transport.
REFERENCES:
patent: 1926509 (1933-09-01), Biertuempfel
patent: 1929425 (1933-10-01), Hermann
patent: 2132642 (1938-10-01), Parsons
patent: 2330941 (1943-10-01), Acuff
patent: 2744042 (1956-05-01), Pace
patent: 3211253 (1965-10-01), Gonzalez
patent: 3831710 (1974-08-01), Wirt
Heckel Klaus
Kurtze Gunther
Firma Carl Freudenberg
Franklin Lawrence R.
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