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US 5,512,114 AGranted
One-piece single metal spinneret and method for making it
AssigneeE. I. Du Pont de Nemours and Company
InventorsMark A. Short, Thomas E. Willis
Life of this patent
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Abstract
A process for making a spinneret from a single body of metal with a yield strength of more than 350 MPa involving drilling lead spinneret holes into the mass of the body, annealing only a thin layer of the body opposite the lead holes, and forming capillary spinneret holes through the annealed layer to connect with the lead holes.
Claims5
A process for making a spinneret from a one-piece single metal body exhibiting a yield strength of greater than 350 MPa and having an entrance face and an exit face comprising the steps of:
- (a) drilling at least one lead hole from the entrance face into the body;
- (b) annealing only a capillary zone of the body extending from the exit face into the body to an inner end of capillary by heating only the capillary zone to a temperature above the recrystallization temperature and below the melting point of the metal whereby the metal only in the capillary zone exhibits a yield strength of less than 350 MPa;
- (c) forming at least one capillary from the exit face, through the capillary zone, into the body, and connecting with the lead hole.
Dependencies are inferred from the claim text.