Patent ID: 9138359
Filing Date: 2015-09-22
Classification: A61F,D04H,Y10T

Abstract:
1. A method of making a nonwoven web comprising nanofibers, wherein said nanofibers are made by a melt film fibrillation process, said method of making the nonwoven web comprising the steps of: a. providing a polymer in the form of a polymeric melt; b. utilizing a central fluid stream to form an elongated hollow polymeric film tube from said polymeric melt; c. using a fluid to form multiple nanofibers from the hollow polymeric film tube; and d. laying said nanofibers on a collector to form a nonwoven web, wherein said nonwoven web comprises a layer comprising at least 25% nanofibers with diameters less than one micron, and wherein said nonwoven web has a mean pore diameter of less than about 15 microns.