Effect of twisting and dry and wet heat treatment on glossiness of bright PET FDY
Using 83.3 dtex/36 f bright polyethylene terephthalate(PET)fully drawn yarns(FDY)with circular,triangular and flat cross-sections as raw materials,single strand twisted yarn and double strand twisted yarn were respectively produced by direct twisting and reverse re-twisting after plying on a twisting machine.PET FDY with different cross-sectional shapes was ex-posed to dry heat treatment at different temperatures and time,as well as wet heat treatment in boiling water for different periods of time.The effects of twisting and dry and wet heat treatment conditions on the glossiness of PET FDY were studied.The results showed that the glossiness of single strand twisted yarns with different cross-sectional shapes showed a decreasing trend as the twisting degree increased,and the effect of twisting on the glossiness of PET FDY with triangular or flat cross-section was more significant at low twisting degrees;the glossiness of double strand twisted yarn mainly depended on the initial twist of single strand twisted yarn,and the direction of initial and repeated twists had no effect on the glossiness of the yarn;the glossiness of PET FDY gradually decreased with the increase of dry heat treatment temperature of 80-120℃and time of 1-3 h,and the effect of dry heat treatment temperature was more significant than that of dry heat treatment time;and the glossiness of PET FDY with circular cross-section remained stable at 9.7-9.8,while the glossiness of PET FDY with triangular or flat cross-section showed a significant downward trend with treatment time during wet heat treatment in boiling water at 100℃for 1-3 h.
polyethylene terephthalate fiberfully drawn yarnbrighttwistingdry and wet heat treatmentglossiness
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