Title: Method of making fibrous electret web using nonaqueous polar liquid
Application Number: 00813970 Application Date: 2000.02.04
Publication Number: 1384896 Publication Date: 2002.12.11
Approval Pub. Date: 2006.01.25 Granted Pub. Date: 2006.01.25
International Classifi-cation: D06M23/10;D06M13/144;D06M13/148;D06M13/248;D06M13/402;D06M13/345;D06M13/127;D06M13/188;B01D39/16;B03
Applicant(s) Name: 3M Innovative Properties Co. Address:
Inventor(s) Name: P.D. Ertzman;A.D. Rousseall;M.E. Jones
Attorney & Agent: zhu limeng
Abstract:
    A method of charging fibrous webs with nonaqueous polar liquids. A web (20) that contains nonconductive fibers is wetted with a nonaqueous polar liquid (14). The web (20) is then substantially dried (22) to provide a fibrous electret web. The fibrous electret web can be used as a filter in a filtration face mask (40) that is adapted to cover the nose and mouth of the wearer. The present method has the advantage over known charging methods in that the nonaqueous liquid requires less energy for drying than is required for aqueous liquids. Additionally, many filter webs can be directly wetted with nonaqueous liquids, which cannot be easily wetted with aqueous liquids.
Time: 8
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