Patent ID: 7691318
Filing Date: 2010-04-06
Classification: D01D,Y10S

Abstract:
1. A method for forming a composite hollow fiber comprising the steps of: providing a spinnerette assembly comprising: delivering a fiber-forming material to said fiber-forming material passages; injecting a bore forming fluid into said bore-forming fluid passages; extruding the fiber-forming material through said horizontal transverse passages and said bottom plate annular passages and around each of said needles while simultaneously allowing the bore-forming fluid to exit said needles to thereby provide a plurality of nascent extruded hollow fibers each comprising a bore forming fluid situated in the center of said fiber-forming material as said fiber-forming material exits the spinnerette assembly at said bottom plate bottom side; optionally passing the plurality of hollow fibers through an air gap; and solidifying the hollow fibers by cooling, solvent evaporation, or solvent extraction.