Shaped microperforated polymeric film sound absorbers and methods of manufacturing the same

摘要

Shaped, microperforated sound absorbers and methods of making the same are herein provided. In one embodiment, the sound absorber is produced from a polymeric, typically plastic, film having a series of microperforations formed over all or a portion of the film surface. The film is then formed to produce the desired three-dimensional shape. The depth of the three-dimensional shape is controlled to provide the desired cavity depth which, in turn, influences the sound absorption spectrum. After forming, the three-dimensional shape is maintained without the need for additional supports or frames. Deformation of the microperforations due to the forming process does not substantially interfere with the sound absorption properties of the film. Further, film resonance over largely unsupported portions also has little effect on the sound absorption spectrum.