Discussion on production process of direct melt-spun PA 66 fiber for sewing thread
A 122 dtex/36 f polyamide 66(PA 66)fiber for sewing thread was produced using PA 66 salt solution with a mass fraction of 48.9%as raw material by continuous polymerization-direct melt spinning process on a conventional production line.The effects of melt viscosity,heat retarder temperature,cross air blow conditions,oil content,draw ratio and heat setting temper-ature on the production and product quality were emphatically discussed.The results showed that the production process was sta-ble and the spinnability was good when the relative viscosity of PA 66 melt was controlled as(83.0±2),the heat retarder tem-perature as(285±2)℃,the cross air blow speed as 0.2-0.3 m/s and the temperature as 22℃,the oil content as(0.4±0.1)%,the draw ratio as(5.5±0.1),and the heat setting temperature as(230±2)℃;and the A-grade product rate of 122 dtex/36 f PA 66 fiber for sewing thread was above 88%and the produced fiber had the breaking strength up to 8.2 cN/dtex,dry hot shrinkage as low as 3.9%and the dyeing uniformity of 3-4 level under the above process conditions,which can meet the demands of sewing thread customers.
polyamide 66 fibersewing threaddirect melt spinningbreaking strengthdry hot shrinkage
NETL
NSTL
万方数据
维普
