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US 7,582,247 B2Granted
Electroblowing fiber spinning process
AssigneeE. I. Du Pont de Nemours and Company
InventorsJack Eugene Armantrout, Michael Allen Bryner, Christel Berta Spiers
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Abstract
A fiber spinning process which provides an uncharged, electrically conductive polymer-containing liquid stream, issues said liquid stream in combination with a forwarding gas in a direction from at least one spinning nozzle in said spinneret, passes said liquid stream through an ion flow formed by corona discharge to impart electrical charge to the liquid stream, forms fine polymer fibers of said polymer and collects said fine polymer fibers.
Claims13
A fiber spinning process comprising:
- providing an uncharged, electrically conductive polymer-containing liquid stream to a spinneret;
- issuing said polymer-containing liquid stream in combination with a forwarding gas in a direction from at least one spinning nozzle in said spinneret;
- passing said polymer-containing liquid stream through an ion flow formed by corona discharge to impart electrical charge to the liquid stream;
- forming fine polymer fibers of said polymer;
- and
- collecting said fine polymer fibers;
- wherein said polymer-containing liquid stream further comprises a solvent for said polymer, and
- wherein said ion flow is formed between differentially charged point- and target-electrodes, and the electrodes are disposed a variable die-to-electrode distance (DED) from the spinning nozzle that is short enough to impart electrical charge to the polymer-containing liquid stream prior to fiber formation.
5 more elements
A fiber spinning process comprising:
- providing an uncharged, electrically conductive polymer solution to a spinneret;
- issuing said polymer solution as a stream in combination with a forwarding gas in a direction from at least one spinning nozzle in said spinneret;
- passing said stream through an ion flow formed by corona discharge, said ion flow being transverse to the direction of the stream, to impart electrical charge to said stream;
- forming fine polymer fibers having average effective diameters of less than about 0.5 micrometer from said stream;
- and
- collecting said fine polymer fibers as a fibrous web having substantially no residual electrical charge:
- wherein said polymer-containing liquid stream further comprises a solvent for said polymer, and
- wherein said ion flow is formed between differentially charged point- and target-electrodes, and the electrodes are disposed a variable die-to-electrode distance (DED) from the spinning nozzle that is short enough to impart electrical charge to the polymer-containing liquid stream prior to fiber formation.
5 more elements
Dependencies are inferred from the claim text.