Discussion on production technology of HMLS polyester industrial yarn
A 1 670 dtex/480 f high-modulus low-shrinkage(HMLS)polyester industrial yarn was produced by using bright pol-ymerized polyethylene terephthalate(PET)chips with an intrinsic viscosity of 1.12-1.14 dL/g as raw materials on a spinning equipment of Japan TMT Company.The effects of the intrinsic viscosity,screw temperature,calm zone height,cooling process and drawing process on the properties of HMLS polyester industrial yarn were discussed.The results showed that the intrinsic vis-cosity of oil-free fiber could be ensured at 0.95-0.97 dL/g when the intrinsic viscosity of PET chips was controlled at 1.12-1.14 dL/g;the suitable screw temperature was 280-290℃and the height of calm zone was 50 mm when the HMLS polyester in-dustrial yarn was produced using spinnerets with microholes in circular distribution;low-temperature cooling process could ensure the yarn to bear high winding speed and drawing force;and compared with low-temperature cooling high-temperature drawing process,the low-temperature cooling low-temperature drawing process contributed slightly higher breaking strength and lower elongation at break to HMLS polyester industrial yarn,and the cord showed high strength retention after dipping and the broken filament rate was significantly higher than that under low-temperature cooling high-temperature drawing process.
high modulus and low shrinkagepolyester industrial yarncooling processdrawing processtensile strength re-tention
万方数据
维普
