Patent ID: 9347154
Filing Date: 2016-05-24
CPC Classification: B60C,D01F,D02G,D10B,Y10T

Claim Text:
1. A drawn polyethylene terephthalate (PET) fiber, including 90 mol % or more of PET, wherein a creep rate defined by the following Calculation Formula 1 is 5.5% or less when the drawn PET fiber is fixed under the initial load of 0.01 g/d and is kept for 24 hours under the load of 0.791 g/d and the temperature of 100° C.: wherein L is a length of the drawn PET fiber after keeping it for 24 hours, L0 is a length of the drawn PET fiber when it is fixed under the initial load, wherein the drawn PET fiber is obtained by drawing an undrawn PET fiber at a draw ratio of 1.0 to 1.70, and wherein the undrawn PET fiber has an amorphous orientation factor (AOF) of 0.15 or less.