Influential factors on unwinding performance of polyester POY bottom yarn
In the production of 131 dtex/144 f polyester pre-oriented yarn(POY),the unwinding performance index(PPF)of POY bottom yarn was measured using a PPT-100 unwinding tension tester.The effects of POY oil content,interlacing pressure,winding angle,friction roller contact pressure and overfeeding rate on the unwinding performance of POY bottom yarn were em-phatically investigated.The results showed that the PPF of POY bottom yarn first decreased and then tended to be stable as the oil content and interlacing pressure of polyester POY increased;the PPF of POY bottom yarn first decreased and then increased with the increase of winding angle and gradually increased as the contact pressure of friction rollers increased;the overfeeding rate had little effect on the PPF of POY bottom yarn;and the unwinding performance of POY bottom yarn was good under the condi-tions as followed:oil content of 0.37%,interlacing pressure of 0.08 MPa,winding angle of 5.1 °,friction roller contact pres-sure of 100 N,and overfeeding rate of 0.