Acoustic articles and assemblies
Assignee3M Innovative Properties Company
InventorsNicole D. Petkovich, Michelle M. K. Mok, Michael R. Berrigan, Jonathan H. Alexander, Samantha D. Smith, Yongbeom Seo, Daniel E. Johnson
Life of this patent
Estimating the term…
Abstract
Provided herein are acoustic articles (100) that include a porous layer (102) and heterogeneous filler (104) received in the porous layer. The heterogeneous filler is substantially non-porous and present in an amount of from 0.25% to 7% by volume relative to the total volume of the porous layer and has a specific surface area of from 0.01 m2/g to 1 m2/g. The acoustic article has a flow resistance of from 500 MKS Rayls to 12,000 MKS Rayls.
Claims16
An acoustic article comprising:
- a porous layer;
- and
- heterogeneous filler, the heterogeneous filler being substantially non-porous and containing no holes or voids present in an amount of from 0.25% to 7% by volume relative to the total volume of the porous layer, and having a specific surface area of from 0.01 m/g to 1 m2/g,
- wherein the porous layer is a non-woven fibrous layer comprising a plurality of fibers,
- wherein the heterogenous filler is enmeshed in the plurality of fibers,
- wherein the enmeshed filler particles are decoupled from each other and the porous layer and have an average interparticle spacing from 20 micrometers to 4000 micrometers, and
- wherein the acoustic article has a flow resistance of from 500 MKS Rayls to 12,000 MKS Rayls.
A method of making an acoustic article comprising:
- directly forming a non-woven fibrous web out of a plurality of fibers;
- delivering a heterogeneous filler into the non-woven fibrous web as the non-woven fibrous web is being directly formed, the heterogeneous filler being substantially non-porous and containing no holes or voids and being present in an amount of from 0.25% to 7% by volume relative to the total volume of the non-woven fibrous web and having a specific surface area of from 0.1 m2/g to 1 m2/g,
- wherein the non-woven fibrous web defines a porous layer,
- wherein the heterogenous filler is enmeshed in the plurality of fibers,
- wherein the enmeshed filler particles are decoupled from each other and the porous layer, and
- wherein the acoustic article has a flow resistance of from 500 MKS Rayls to 12,000 MKS Rayls.
Dependencies are inferred from the claim text.