Patent ID: 9650731
Date: 2017-05-16
CPC Classifications: D01D,D01F,D04H

Claim:
1. A method for producing micro and/or nanofiber webs from a solution of polymers, characterized by the injection of shear air jets, using a pressure gradient/differential and comprising: pumping through two or more inner nozzles one or more polymeric solutions, each comprising at least one polymer dissolved in at least one solvent, wherein a polymeric solution pumped through one inner nozzle may be the same as or different from a polymeric solution pumped through another inner nozzle; passing a compressed gas at high speed through an outer nozzle to direct the production of fibers; and collecting the polymeric fibers spun in a collector, wherein the inner and outer nozzles are concentric, the two or more inner nozzles extend beyond the outer nozzle in the direction in which the one or more polymer solutions are ejected, one of the two or more inner nozzles is the innermost nozzle, and an electrostatic force differential is not applied between the nozzles and the collector.