Perforated cellular sound absorption material
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United States of America Patent
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Oct 5, 1999
Grant Date -
N/A
app pub date -
Oct 29, 1997
filing date -
Oct 29, 1997
priority date (Note) -
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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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