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US 6,419,871 B1Granted
Plasma treatment of filter media
AssigneeTransweb, LLC
InventorKumar Ogale
Life of this patent
Estimating the term…
Abstract
The present invention is drawn to an improved electrostatic filter medium comprising a web of electret fibers which have been treated with fluorine-containing plasmas at a deposition amount of about 0.03 g/m2 to about 1.5 g/m2; electrostatically charged; rinsed; and dried. The present invention is further drawn to a method of producing non-woven webs which have been treated with a fluorine-containing plasma at a deposition amount of about 0.03 g/m2 to about 1.5 g/m2; electrostatically charged; rinsed; and dried.
Claims8
A method of forming a non-woven web, which comprises:
- (1) melt blowing polyolefin fibers into a non-woven web;
- (2) treating said non-woven web with a fluorine-containing plasma at a deposition amount of about 0.03 g/m2 to about 1.5 g/m2;
- (3) charging said treated non-woven web to form a non-woven web of electret fibers;
- (4) rinsing said treated and charged non-woven web;
- and
- (5) drying said non-woven web.
3 more elements
A method of forming a non-woven web, which comprises:
- (1) treating a thin film of polymer with a fluorine-containing plasma at a deposition amount of about 0.03 g/m2 to about 1.5 g/m2;
- (2) electrically charging said treated thin film;
- (3) rinsing said treated and charged thin film;
- (4) drying said thin film;
- (5) fibrillating said charged film to form fibers;
- and
- (6) forming said fibers into a non-woven web of electret fibers.
4 more elements
Dependencies are inferred from the claim text.