Acoustic Article
Assignee3M Innovative Properties Company
InventorPeter A. Masterson
Life of this patent
Estimating the term…
Abstract
Provided is an acoustic article that include a first porous layer having a first density, and a second porous layer having a second density that is disposed on the first porous layer. The first density is from 110 percent to 1200 percent of the second density or the second density is from 110 percent to 1200 percent of the first density. The first porous layer includes a plurality of apertures extending through the first porous layer, where the plurality of apertures are not considered when determining density. These acoustic articles can provide significant noise reduction in various applications, including server housings.
Claims16
An acoustic article comprising:
- a first porous layer having a first density;
- and
- a second porous layer having a second density that is disposed on the first porous layer, wherein the first density is from 110 percent to 1200 percent of the second density or the second density is from 110 percent to 1200 percent of the first density, and
- wherein the first porous layer includes a plurality of apertures extending through the first porous layer and wherein the plurality of apertures are not considered when determining density.
A method of reducing noise in an enclosure in which there is air flow, the method comprising:
- providing an acoustic article comprising:
- a first porous layer having a first density;
- and
- a second porous layer having a second density that is disposed on the first porous layer, wherein the first density is from 110 percent to 1200 percent of the second density or the second density is from 110 percent to 1200 percent of the first density,
- wherein the first porous layer includes a plurality of apertures extending through the first porous layer and wherein the plurality of apertures are not considered when determining density;
- and
- disposing the acoustic article within the enclosure such that the air flow is guided along an exposed major surface of the acoustic article.
Dependencies are inferred from the claim text.