HIGH-STRENGTH POLYETHYLENE TEREPHTHALATE YARN AND METHOD FOR PRODUCING THE SAME
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United States of America Patent
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Jul 9, 2020
app pub date -
Sep 3, 2018
filing date -
Sep 22, 2017
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Abstract
Disclosed are a PET fiber having an intrinsic viscosity of 1.1 dl/g or higher and a tensile strength of 10 g/d or higher, and a manufacturing method therefor. The manufacturing method includes the steps of: melting a polyethylene terephthalate chip having an intrinsic viscosity of 1.4 to 1.7 dl/g to prepare a spinning melt; discharging the spinning melt through a nozzle of a spinning pack; heating the spinning melt just before being discharged from the nozzle by means of a heat source of 300 to 500° C. located immediately below the nozzle; converging a plurality of filaments formed by the discharging to form a multifilament; and drawing the multifilament, wherein a temperature of the spinning pack is maintained at 280 to 305° C.
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