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US 2008/0157440 A1Published application
Process for electroblowing a multiple layered sheet
AssigneeE. I. Du Pont de Nemours and Company
InventorsJoseph Brian Hovanec, Micheal John Moore
Life of this patent
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Abstract
A process for electroblowing a multiple layered sheet using multiple spinning beams to produce different component webs wherein the sheet doesn't stick to the forming screen and has improved web stability.
Claims6
A process for electroblowing a multiple layered sheet comprising spinning an electrically conductive liquid stream comprising a polymer dissolved in a solvent through at least two spinning beams comprising a linear array of spinning nozzles in the presence of a forwarding gas and an electric field to form fibers and deposit the fibers onto a collecting screen, wherein:
- (a) a first spinning beam provides fibers that are deposited onto the collecting screen with a solvent concentration of about 0 to about 30 weight percent that make a first web;
- and
- (b) a second spinning beam provides fibers that are deposited onto the first web with a solvent concentration of about 30 to about 70 weight percent that make a second web, wherein the difference in solvent concentration between the webs is at least 10 weight percent.
Dependencies are inferred from the claim text.