In order to spin the high quality PLA filaments, the melt spinning method was adopted and the chip drying process was optimized. The effects of spinning parameters, including spinning temperature and speed, stretching ratio and temperature, on the performance of PLA filament ( viscosity average molecular weight, orientation and mechanical property) were also researched. The results indicated that the PLA chip should be dried in two stages. At the first stage, the temperature should climb up to 60-65℃. and was held for 3 - 4 h, in order to pre-crystallize, and at the second stage, the drying temperature rose up to 100 ℃. and was held for 15 h. Finally, the chip moisture content should be lower than 0.005%. The optimum spinning parameters were as follows: spinning temperature 195℃ , spinning speed 1 000 m/min, stretching ratio 3 and stretching temperature T1/T2/T3 = 72℃/80℃/82℃.
NETL
NSTL
维普
万方数据
