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US 5,512,113 AGranted
One-piece single metal spinneret having softened capillary zone
AssigneeE. I. Du Pont de Nemours and Company
InventorsMark A. Short, Thomas E. Willis
Life of this patent
Estimating the term…
Abstract
A one-piece single metal spinneret is disclosed having a capillary zone with capillaries of a length more than 1.5 times the capillary diameter and a yield strength, outside the capillary zone, of greater than 350 MPa. A process for making the spinneret is, also, disclosed.
Claims5
A spinneret comprising a one-piece single metal body having:
- (a) an entrance face, and
- (b) an exit face with
- (c) at least one spinning passage extending from the entrance face to the exit face wherein the spinning passage includes a lead hole with a cross-sectional area and extends for a length from the entrance face into the metal body and a capillary with a cross-sectional area and extends for a length through a capillary zone from the exit face into the metal body to a point of connection with the lead hole, wherein the metal in the capillary zone is softer and has a yield strength which is less than the metal in the remainder of the body and wherein the cross-sectional area of the lead hole is greater than the cross-sectional area of the capillary, and the length of the capillary is more than 1.5 times the diameter of the capillary.
Dependencies are inferred from the claim text.