PA6 DTY染色不匀影响因素的探讨

对PA6预取向丝(POY)和弹力丝(DTY)的结构、力学性能等进行测试分析,探讨了PA6 POY在DTY加工过程中结构的变化对染色性能的影响。结果表明:PA6 POY经拉伸变形后,其晶型由亚稳定态的γ晶型转变为稳态的α晶型,随着POY双折射和初始模量的增加,在变形加工过程中所受的加捻张力增大。PA6 POY的结构差异在假捻变形中被放大,取向度较低、初始模量较小的PA6 POY在加工过程时受的假捻张力较小,制得的DTY结晶度较低,染色偏深,造成锦纶DTY的染色均匀性下降。

Influential factors on dyeing unevenness of PA6 DTY

The structure and mechanical properties of PA6 pre-oriented yarn (POY) and draw textured yarn (DTY) were measured and analyzed.The effect of the structure transformation of PA6 POY on the dyeing behavior was discussed during DTY processing course.The results showed that the crystal form of PA6 POY was transformed from metastableγtype into steadyαtype and the texturing tension was increased with increasing the hirefringence and initial modulus during the texturing process.The structure difference of PA6 POY was magnified during the false-twist texturing process.The PA6 POY with relatively low orienta- tion degree and initial modulus was exposed to relatively low false-twist tension during the processing and the obtained DTY exhib- ited relatively low crystaUinity and dark color,which resulted in the decrease in the dyeing uniformity of PA6 DTY.