Reason analysis of broken filament and process optimization of 111 dtex/144 f polyester DTY
Using 180 dtex/144 f polyester pre-oriented yarn(POY)as raw material,111 dtex/144 f polyester drawn textured yarn(DTY)was produced by texturing process.The reasons for the formation of broken filament were analyzed during the pro-duction.And the effect of the main process parameters,including POY oil content,DTY processing speed,speed ratio(D/Y),the first hot box temperature and draw ratio on the broken filament downgrade rate of DTY were discussed.The results showed that the oil content of POY precursor,DTY processing speed and D/Y had little effect on the formation of broken filament during the production of 111 dtex/144 f polyester DTY;the first hot box temperature and draw ratio were the main influential factors on the formation of broken filament;and the appearance of 111 dtex/144 f polyester DTY was significantly improved,the broken fil-ament downgrade rate decreased from about 6.5%to about 0.5%,and the breaking strength increased from 3.74 cN/dtex to 3.92 cN/dtex with a significant decrease in the coefficient of variation of breaking strength when the main process parameters were optimized as follows:the oil content of POY precursor of 0.35%,processing speed of 720 m/min,the D/Y of 1.60,the first hot box temperature of 189℃and the draw ratio of 1.695.
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