Microperforated polymeric film for sound absorption and sound absorber using same
First Claim
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1. A microperforated polymeric film sound absorber, comprising:
- a surface; and
a microperforated polymeric film having a bending stiffness of 107 dyne-cm or less disposed near the surface such that the film and the surface define a cavity therebetween, the film including a plurality of microperforations having a narrowest diameter of 20 mils or less and a relatively large free span portion spanning at least part of the cavity;
wherein the relatively large free span portion has a length of about 100 mils or more;
wherein the sound absorber does not include other microperforated films.
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Abstract
Microperforated polymeric films and sound absorbers using such films are provided. The microperforated polymeric films may be relatively thin and flexible and may further include holes having a narrowest diameter less than the film thickness and a widest diameter greater than the narrowest diameter. The microperforated polymeric films of a sound absorber may also have relatively large free span portions, which, in certain embodiments, may vibrate in response to incident sound waves.
91 Citations
26 Claims
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1. A microperforated polymeric film sound absorber, comprising:
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a surface; and
a microperforated polymeric film having a bending stiffness of 107 dyne-cm or less disposed near the surface such that the film and the surface define a cavity therebetween, the film including a plurality of microperforations having a narrowest diameter of 20 mils or less and a relatively large free span portion spanning at least part of the cavity;
wherein the relatively large free span portion has a length of about 100 mils or more;
wherein the sound absorber does not include other microperforated films. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22)
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23. A sound absorber, comprising:
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a surface;
a microperforated film disposed near the surface such that the film and the surface define a cavity therebetween, the film including a plurality of microperforations having a narrowest diameter of 20 mils or less; and
a thermoplastic sound absorbing fibrous material disposed adjacent the microperforated film. - View Dependent Claims (24, 25, 26)
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Specification