Perforated cellular sound absorption material

Details Perforated cellular sound absorption material Perforated cellular sound absorption material

1997-10-29

1999-10-05

Watkins, III, William P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including aperture

428156, 4283044, 181293, 181288, 264 48, 264504, 83 30, B24B 324, E04B 182

Patent

active

059621079

ABSTRACT:
A cellular material, preferably a low density foam material, having an initial average normal incidence sound absorption coefficient for a selected frequency range is perforated to form a perforated cellular sound absorption material. The perforated cellular sound absorption material formed has an average normal incidence sound absorption coefficient for the selected frequency range greater than the initial average normal incidence sound absorption coefficient of the cellular sound absorption material. The depth(s), diameter(s), shape(s) and pattern of the perforations provide the cellular sound absorption material with the improved sound absorption properties that are reflected in the increased average normal incidence sound absorption coefficient of the material.

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