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OwnerPaul Karol Casey, Kailash Dangayach +2inventors
InventorsPaul Karol Casey, Kailash Dangayach, Linda Harvey Oliveri, Donald Albert Shiffler
Estimating the term…
A process for making textile staple fibre from polytrimethylene terephthalate (PTT) which comprises: (a) melt extruding PTT polymer at 245 to 253° C., (b) spinning the extruded PTT into yarn using at least one spinneret, (c) moving the spun yarn to a first takeup roll wherein the distance from the spinneret to the roll is from 16 to 20 feet, (d) cooling the spun yarn to less than 31° C. before it reaches the roll, (e) prior to the draw process, preconditioning the yarn under tension at a temperature of at least 60° C., (f) drawing the yarn at a temperature of at least 60° C., (g) allowing the drawn yarn to relax at a temperature of up to 190° C., and (h) crimping the drawn yarn at a temperature of 70 to 120° C., and decreasing the drawn yarn feed denier into the crimper by 10 to 60 percent by denier.
A process for making textile staple fibre from polytrimethylene terephthalate (PTT) on existing PET textile staple fibre making equipment which comprises:
The process of any one of the preceding claims wherein step (i) further comprises using a crimper volume of 10 to 50 percent more than the crimper volume of the crimper used to make comparable PET.
The process of any one of the preceding claims wherein the drawn yarn feed rate is decreased by 40 to 60 percent.
A process for making textile staple fibre from polytrimethylene terephthalate (PTT) on existing PET textile staple fibre making equipment which comprises:
The process of any one of the preceding claims wherein step (g) involves at least two draws, the first carried out at least 60° C. and the second and subsequent draws, if any, carried out at a higher temperature than the first up to the melting point of the yarn.
Dependencies are inferred from the claim text.