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US 4,375,444 AGranted
Method for the elimination of circumferential stress cracks in spun polyesters
AssigneeThe Goodyear Tire & Rubber Company
InventorWilliam O. Deeken
Life of this patent
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Abstract
A method for the elimination of circumferential stress cracks that occur during production of spun polyesters is provided. The cracks are eliminated by the use of an organic solvent miscible with the lubricating emulsion applied during the finish operation before draw twisting of the spun polyester. The organic solvent may be kerosene or mineral oil or solutions containing the same.
Claims3
A process to minimize circumferential stress cracking in spun polyester filaments, comprising:
- (a) mixing a miscible non-aqueous solution of a fiber finishing emulsion and an organic solvent, said emulsion having emulsifiers, lubricating oils, antistat oils and heat stabilizers;
- said organic solvent selected from the group consisting of:
- mineral oil, kerosene, and combinations thereof;
- (b) melt spinning polyester fiber;
- (c) contacting said solution with the fiber;
- (d) storing the spun polyester;
- and
- (e) draw twisting the spun polyester to produce a spun polyester yarn having minimal circumferential stress cracks.
5 more elements
Dependencies are inferred from the claim text.