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

A sound absorbing body comprising:

• a polymeric film comprising first and second major surfaces;
• a plurality of microperforations extending between the first and second major surfaces of the polymeric film;
• and
• a three-dimensional shape formed by the polymeric film, the three-dimensional shape comprising an interior surface and an exterior surface, wherein the interior surface defines a volume of the three-dimensional shape, and further wherein, in response to incident soundwaves at a particular frequency in the audible frequency spectrum, the sound absorbing body absorbs at least a portion of the incident soundwaves, and further wherein at least a portion of the three-dimensional shape vibrates in response to the incident soundwaves.

A sound absorbing body comprising:

• a polymeric film comprising first and second major surfaces;
• a plurality of microperforations extending between the first, and second major surfaces of the polymeric film;
• a three-dimensional shape formed by the polymeric film, the three-dimensional shape comprising an interior surface and an exterior surface, wherein the interior surface defines a volume of the three-dimensional shape;
• and
• fibrous sound absorbing material proximate the polymeric film.

A sound absorbing body comprising:

• a polymeric film comprising first and second major surfaces;
• a plurality of microperforations extending between the first and second major surfaces of the polymeric film;
• and
• a three-dimensional shape formed by the polymeric film, the three-dimensional shape comprising an interior surface and an exterior surface, wherein the interior surface defines a volume of the three-dimensional shape, and further wherein, in response to incident soundwaves at a particular frequency in the audible frequency spectrum, the sound absorbing body absorbs at least a portion of the incident soundwaves, and further wherein at least a portion of the three-dimensional shape vibrates in response to the incident soundwaves, and still further wherein the sound absorbing body operates to cause a normal incidence sound absorption spectrum to exhibit a notch.