热态下除尘滤袋缝纫线的力学性能

利用配有加温箱的强力机研究了用于袋式除尘的PTFE，PPS，芳纶，PAN，PET缝纫线在20~300℃范围内，温度对其力学性能的影响.结果表明:热态拉伸相对烘后冷却再拉伸的实验更能说明实际工况下温度对缝线的影响;PTFE缝纫线受温度影响显著;PPS缝纫线在240℃下热稳定性仍良好;芳纶缝纫线耐热性良好，强力变化小，但本身强力略低;PAN缝纫线在120℃以上的高温下强力大幅下降;PET缝纫线的力学性能受温度影响较小，但不能用于高温.热态下缝纫线的力学性能各有优缺，整体强力较低，高温烟尘捕集中滤袋受过滤及脉冲喷吹外力影响，极可能造成缝纫线断裂，导致滤袋失效.

Mechanical Properties of Sewing Thread in Dust Filter Bag Under Thermal Condition

The effect of temperature on the mechanical properties of PTFE， PPS， aramid， PAN and PET sewing threads for baghouse in the temperature range of 20 ~ 300℃ was studied using a powerful machine equipped with a heating box. The results showed that the experiment of hot stretching can better explain the effect of temperature on properties of the sewing thread under actual working conditions than that of cooling and re-stretching after baking. PTFE sewing thread is significantly affected by temperature. PPS sewing thread can still have good thermal stability at 240℃. Aramid sewing thread， although its strength is slightly lower， has good heat resistance ability with little strength changing. The strength of PAN sewing thread decreases sharply over 120℃. The mechanical properties of PET sewing thread are less affected by temperature， but cannot be used under high temperature. The mechanical behavior of each sewing thread is not the same under thermal conditions， but the overall strength is low. Because the high temperature soot trapping filter bag is affected by the external force caused by filtration and pulse jetting， the filter bag is much more likely to fail due to the break of the sewing thread.