Air-filter media comprising a relofted spunbonded web, and methods of making and using
Assignee3M Innovative Properties Company
InventorsZhiqun Zhang, Edward Keith Willis, Jacob J. Thelen, Daniel E. Johnson, Bryan L. Gerhardt, Michael R. Berrigan
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Abstract
A relofted, spunbonded nonwoven web exhibiting a solidity of from less than 8.0%, to at least 3.0%, and exhibiting a Quality Factor of at least 0.30. Methods of making a relofted web; and, methods of using a relofted web as an air-filtration web, e.g. as a filter media or a layer thereof.
Claims23
An air-filter media comprising a relofted, spunbonded nonwoven web exhibiting a solidity of from less than 8.0%, to at least 3.0%, and exhibiting a Quality Factor of at least 0.30.
A process of relofting a spunbonded precursor web, the process comprising:
- mechanically working a spunbonded precursor web that comprises a solidity of no more than 10%, to produce a relofted, spunbonded air-filtration web comprising a solidity of from less than 8.0%, to at least 3.0%, and comprising a Quality Factor of at least 0.30.
Dependencies are inferred from the claim text.