Improved yarn extraction process
AssigneeE. I. Du Pont de Nemours and Company
InventorsGary Brett Lewis, Stephen Donald Moore
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Abstract
The salt content of neutralized aromatic polyamide fibers spun from an acid solution downwardly into a spin tube containing the fibers and a coagulating liquid is reduced when a gas is injected into the spin tube 0.25 to 20 cm. downstream from the entrance of the spin tube.
Claims5
A process for spinning an acidic solution of an aromatic polyamide downwardly through a non-coagulating fluid into a liquid coagulating bath and subsequently through a spin tube through which some of the coagulating liquid passes along with the freshly spun fibers at a spinning speed of at least 300 mpm wherein 0.1 to 3 volumes of a gas per volume of coagulating liquid passing through the spin tube are injected into the spin tube at a point 0.25 to 20 cm. downstream from the entrance of the spin tube.
Dependencies are inferred from the claim text.