Datetime:2021-12-13 16:43:48  

CHEN Yonghong  ZHANG Xiwen  YANG Jing  HOU Xiaopeng

（Shaanxi Yuanfeng Textile Technology Research Co.，Ltd.，Xi′an，710038，China）

    Abstract  Sizing process of aramid yarn was discussed.Aiming at the problems of lower loom efficiency and many fabric defects after sizing aramid yarn，aramid yarn sizing instruction was optimized.Sizing properties of the three different sizing instructions and corresponding sizing yarns breaking strength，elongation，hairiness，loom efficiency，fabric defect and weaving dust off were tested.The results showed that when the contents of PVA，modified starch，acrylic acid and antistatic agent in the sizing instruction were 17%，76%，5% and 2%，thermal stability of sizing liquor viscosity was better，loom efficiency could be reached above 90%.There were few fabric weaving defects and air environment in the workshop was better.It is considered that reasonable proportion setting of PVA，modified starch and acrylic acid in sizing instruction，the loom efficiency can be improved.