再生聚酯直纺涤纶工业丝成套设备技术探讨

Complete equipments and technology for polyester industrial yarn directly spun from recycled polyester

采用回收聚酯(PET)瓶片,通过液相增黏直接纺丝生产涤纶工业丝,探讨了再生聚酯直纺涤纶工业丝的成套设备和工艺技术。结果表明:对干燥设备和螺杆挤压机进行改造,利用双级熔体预过滤器和液相增黏系统,聚酯瓶片再生增黏后特性黏数可达(0.85±0.01)dL/g;该成套设备的关键是采用单轴式液相增黏反应器;调整纺丝和拉伸工艺,直接纺丝生产的涤纶工业丝线密度为1 189 dtex,断裂强度为7.98 cN/dtex,断裂伸长率为14.66%,达到了常规固相增黏法生产的涤纶工业丝的性能指标。

Polyester （PET） industrial yarn was prepared from recycled PET bottle flake via liquid-state polycondensation and directly spinning process. The complete equipment and process technology for directly spinning recycled PET industrial yam were discussed. The results showed that the PET bottle flake can be regenerated with the intrinsic viscosity up to （0.85 ±0. 01 ） dL/ g after regeneration and polyeondensation as the drying unit and screw extruder were reformed and a two-stage melt prefilter and liquid-state polycondensation system were applied ; the key to the complete equipment was to introduce an uniaxial liquid-state polyeondensation reactor; the directly-spun PET industrial yarn had the linear density of 1 189 dtex, breaking tenacity 7.98 eN/ dtex and elongation at break 14.66% after adjusting the spinning and drawing processes, which were equal to the physical index of PET industrial yarn prepared by solid-state polyeondensation.