Low crystallinity polyester yarn produced at ultra high spinning speeds
AssigneeE. I. Du Pont de Neumours and Company
InventorGeorge Vassilatos
Life of this patent
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Abstract
Spinning of polyethylene terephthalate yarn at speeds in excess of 5000 meters per minute using a gas management technique of the gas surrounding the threadline to control the temperature and attenuation profiles of a spinning threadline provides a means to produce a low crystallinity polyester yarn with a relatively high elongation to break.
Claims2
A continuous filament polyester yarn melt spun in a path from a spinning pack at a spinning speed of at least 5 km/min controlled by a withdrawal means by directing a gas into a zone enclosing said path, said zone extending from said spinning pack to a location between the spinning pack and the withdrawal means maintaining said zone under superatmospheric pressure of less than 1 kg/cm.sup.2 and increasing the velocity of the gas as it leaves the zone to a level greater than the velocity of the filaments, said yarn having a density in the range of from about 1.348 to about 1.370 grams per ml, having an elongation break in the range of from 30% to 120% and having a boil-off-shrinkage which is at least 10%.
Dependencies are inferred from the claim text.