Polyester yarn production
AssigneeFiber Industries, Inc.
InventorRichard H. Stofan
Life of this patent
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Abstract
A method and apparatus are disclosed for the production of a novel industrial polyester filament yarn of improved uniformity wherein a plurality of filaments are melt-spun into a heated zone coupled with controlled cooling. The yarn produced has improved long and short term Uster uniformity and improved uniformity of physical properties, particularly breaking strength, as shown by a reduced standard deviation of breaking strength. The yarn is produced by melt spinning into a heated zone which maintains the filaments molten for intervals below the spinneret face and subsequently quenching the filaments with a radial outflow of cooling gases, thereby producing a low birefringence yarn which is capable of being drawn at high draw ratios to high tenacities.
Claims10
A method for producing an industrial polyester filament yarn of improved uniformity comprising melt spinning a plurality of filaments at an extrusion temperature above the polymer melting point into a heated zone maintained at a temperature of about 260.degree. to 460.degree.C., and maintaining said filaments in said heated zone for a filament travel distance of about 6 to 24 inches, and hence immediately passing said filaments about a gas quenching zone, directing quenching gas onto said filaments in a radial outflow direction, said quenching gas being maintained at a temperature of 15 to 80.degree.C. in a gas volume of 20 to 130 standard cubic feet per minute being exhausted radially along a distance of about 8 to 20 inches of a peripheral diameter of 1.5 to 4 inches to provide a controlled cooling of said filaments and taking up said filaments as a yarn of improved Uster uniformity.
Dependencies are inferred from the claim text.