Production process of direct melt-spun 288 dtex/288 f full-dull flat PET POY
A dry full-dull masterbatch was melt-extruded and dynamically blended with polyethylene terephthalate(PET)melt to produce 288 dtex/288 f full-dull flat PET pre-oriented yarn(POY)by direct melt spinning process.The effects of drying process conditions,screw temperature,spinning component pressure,spinning temperature,quenching conditions,oiling process and winding speed of full-dull masterbatch on fiber properties were studied.The results showed that the 288 dtex/288 f full-dull flat PET POY could be prepared with a breaking strength of 2.15 cN/dtex,elongation at break of 130.5％and flatness of 3.2 un-der the optimal process conditions of drying temperature 140℃and time 10 h for full-dull masterbatch,screw zones in a gradual-ly temperature-increasing arrangement from low temperature,initial pressure of the components 17.0 MPa,pipeline transportation temperature 287.0℃,spinning box temperature 292.5℃,quenching air pressure 35 Pa,windless zone height 55 mm,collec-tion position 900 mm,fiber oil content 0.57％and winding speed 2530 m/min.
polyethylene terephthalate fiberdirect melt spinningfull-dullflatproduction process
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