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US 2011/0214570 A1Published application
Air filtration medium with improved dust loading capacity and improved resistance to high humidity environment
AssigneeE. I. Du Pont de Nemours and Company
InventorsDavid Charles Jones, Hyun Sung Lim, Cheng-Hang Chi, Lu Zhang
Life of this patent
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Abstract
A method for filtering particles from water mist laden air involves passing the air through a medium that has a nanoweb layer in fluid contact with a hydrophobic nonwoven web. The hydrophobic web can be made of an intrinsically hydrophobic material, or can be coated with a hydrophobic coating. The medium does not undergo the large pressure drops normally associated with filtration of water mists and retains its efficiency well.
Claims15
A method for filtering particles from air comprising the steps of;
- providing a flow of air laden with a water mist and containing particles that are to be filtered,
- passing the air flow through a filtration medium,
- said medium having an upstream side and a downstream side relative to the flow of air and comprising a nanoweb layer downstream of and in fluid contact with a hydrophobic nonwoven web.
Dependencies are inferred from the claim text.