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US 10,202,253 B2Granted
Method for winding an elastic yarn package
AssigneeInvista North America S.A R.L.
InventorJoseph E. Koskol
Life of this patent
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Abstract
A method is provided for winding an elastic yarn into a cylindrical substantially straight-ended yarn package. The method includes feeding an elastic or elastomeric yarn at a substantially constant speed to a tube core to form the yarn package. The yarn package is rotated such that the yarn package with a substantially constant surface speed. The yarn is wound to form layers of helical coils, while providing a helix angle variation of greater than zero up to +/−80%.
Claims8
A method for winding a spandex yarn into a cylindrical substantially straight-ended yarn package comprising:
- (a) feeding a spandex yarn at a substantially constant speed to a tube core to form said yarn package;
- (b) rotating the yarn package to provide the yarn package with a substantially constant surface speed of 250 meters/min to about 1400 meters/min;
- and
- (c) winding the yarn at the substantially constant speed to form layers of helical coils while varying the helix angle of the yarn with respect to circumference of the yarn package from +/−20% up to +/−80% to increase variation in yarn laydown width and decrease running bands as compared to yarn wound at a helix angle of +/−2.5%.
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Dependencies are inferred from the claim text.