Acoustical material

Details Acoustical material Acoustical material

1983-08-24

1985-07-16

Lipman, Bernard

Stock material or miscellaneous articles

Two dimensionally sectional layer

Next to unitary web or sheet of equal or greater extent

428119, 428131, 181286, B32B 314

Patent

active

045296375

ABSTRACT:
The disclosure is directed broadly to a thin metal sheet containing a multitude of small openings therethrough. Typically, the sheet will contain at least 400 openings per square inch with the openings having an average cross-sectional area of from about 0.0005 to about 0.005 square inch. The sheets are used to overlay a series of perpendicularly aligned walls which define air chamber(s) behind the sheet. Sound waves pass through the porous sheet and are absorbed in the air chamber(s).

REFERENCES:
patent: 3997492 (1976-08-01), Hankel
patent: 4001473 (1977-01-01), Cook
patent: 4077491 (1978-03-01), Hankel
patent: 4291080 (1981-09-01), Ely et al.
patent: 4292356 (1981-09-01), Whitemore et al.
patent: 4293465 (1981-08-01), Morimoto et al.
Basic Principles of Photo Chemical Machining, Technical Profile _No. PCMI-G-100, Jun. 1976, Photo Chemical Machining Institute, 1717 Howard Street, Evanston, Ill. 60202.

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