Plasma treatment of filter media
AssigneeTransweb, LLC
InventorKumar Ogale
Life of this patent
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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; rinsing; and drying prior to being electrically charged. 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; rinsed; and dried prior to electrostatically charging the web.
Claims16
A filter medium, comprising a web of electret fibers, said fibers having been formed from a material that was
- 1) treated with a fluorine-containing plasma at a deposition amount of about 0.03 g/m2 to about 1.5 g/m2;
- 2) electrostatically charged
- 3) rinsed;
- and
- 4) dried
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 non-woven web;
- and
- (5) drying said non-woven web.
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) rinsing said treated non-woven web;
- (3) drying said non-woven web;
- (4) electrically charging said treated thin film;
- (5) fibrillating said charged film to form fibers;
- and
- (6) forming said fibers into a non-woven web of electret fibers.
In a method of forming a web of electret fibers, which comprises charging electrically charging a filter material in film or fiber form, the improvement which comprises treating the filter material with a fluorine-containing plasma at a deposition amount of about 0.03 g/m2 to about 1.5 g/m2;
- rinsing the filter material and drying the filter material prior to carrying out electrical charging of the filter material.
Dependencies are inferred from the claim text.