高强涤纶工业丝生产中毛丝的产生原因及控制措施

Reasons and control of broken filaments in high-strength polyester industrial yarn

以特性黏数1.100~1.150 dL/g的高黏聚酯切片为原料,通过螺杆挤压熔融、热辊拉伸生产3300 dtex/384 f高强涤纶工业丝,从高黏聚酯切片的特性黏数及含水率、组件结构、冷却条件、油剂上油方式、热辊温度等方面分析了生产中毛丝产生的原因,并提出了控制措施。结果表明:控制高黏聚酯切片的特性黏数在1.120~1.130 dL/g,切片含水率低于25μg/g,有利于减少毛丝的产生;在纺丝组件分配板下方增设导流板,在缓冷区与无风区之间增设多孔板,均可减少毛丝的产生;与使用乳液油、油轮上油相比,使用原油、油嘴上油,可有效减少毛丝的产生;随着第二热辊温度的升高,毛丝降等率呈现先降低后增加的趋势,第二热辊温度为91℃时毛丝降等率最低,为2.22%。

Using a high-viscosity polyester chip with an intrinsic viscosity of 1.100-1.150 dL/g as raw material,3300 dtex/384 f high-strength polyester industrial yarn was produced through screw extrusion melting and hot roller drawing.The reasons for the formation of broken filaments during production were analyzed from the aspects of the intrinsic viscosity and moisture content of high-viscosity polyester chips,spin pack structure,quenching conditions,oiling method and hot roller temperature,and the control measures were proposed.The results showed that it was conducive to reducing the formation of broken filaments when the intrinsic viscosity of the high-viscosity polyester chip was controlled at 1.120-1.130 dL/g and the moisture content lower than 25μg/g;and the formation of broken filaments can be also depressed by adding a guide plate under the distribution plate of the spin pack and a perforated plate between the annealing zone and the windless zone;compared with emulsion and tanker oiling method,crude oil and nozzle oiling method can effectively reduce the production of broken filaments;and the broken filament rate showed a downward and then upward trend as the second hot roller temperature increased and was minimized as 2.22%when the second hot roller temperature was 91℃.