Process for forming a skinless hollow fiber of a cellulose ester
AssigneeCelanese Corporation
InventorColin L. Browne
Life of this patent
Estimating the term…
Abstract
A skinless hollow fiber of a cellulose ester material is formed by providing an aqueous coagulation bath having a tube-in-ring jet immersed therein and extruding a spinning solution comprising at least one cellulose ester material and a solvent therefor directly into the bath through an annulus surrounding the tube of said tube-in-ring jet while simultaneously allowing a portion of the liquid in the bath to be autogenously aspirated through an opening in the tube, located below the surface of the liquid in the bath, and through the tube thereby forming a lumen in the extruded fiber and then drying the extruded fiber.
Claims13
A process of forming a skinless hollow uncollapsed fiber of a cellulose ester material, said process comprising the steps of:
- (a) providing a coagulation bath containing an aqueous liquid having a tube-in-ring jet immersed therein;
- (b) establishing fluid communication between said aqueous liquid contained in said coagulation bath and the tube of said tub-in-ring jet by providing an opening in said tube below the surface of said aqueous liquid;
- (c) extruding a spinning solution comprising at least one cellulose ester material and a solvent therefore directly into said aqueous liquid contained in said coagulation bath through an annulus surrounding the tube of said tube-in ring jet to form an extruded fiber consisting essentially of said at least one cellulose ester material while simultaneously allowing a portion of said aqueous liquid contained in said coagulation bath to be autogenously aspirated through said opening and into said tube thereby forming a lumen in the extruded fiber;
- and then
- (d) drying said extruded fiber to yield a hollow fiber formed of said cellulose ester material.
Dependencies are inferred from the claim text.