水刺加固对膜裂PTFE基布损伤性的影响

The effect of spunlace process on damage of membraned PTFE film base fabric

将水溶性维纶纤网和膜裂PTFE基布复合进行水刺,利用水溶性维纶在水中可溶解的性能去除表层维纶纤网,使膜裂PTFE基布从试样中分离出来,通过测试PTFE基布的强力来获取水刺后基布的损伤情况,观察水刺后基布的表观形态,并与水刺对熔纺PTFE基布的损伤和针刺加固工艺对PTFE基布的损伤进行比较。试验表明:随着水刺压力增大,膜裂PTFE基布强力损失率迅速增大,损伤以纬纱为主;表层纤网中纤维横向排列有助于降低水刺对基布的损伤;在相同水刺工艺参数下,水刺对纤维为长方形截面的膜裂PTFE基布的损伤比对纤维为圆形截面的熔纺PTFE基布的损伤大;针刺加固工艺比水刺加固工艺对膜裂PTFE基布的损伤小。

The PTFE film base fabric covered with layers of water-soluble vinylon fiber webs being spunlaced to form a felt was designed, further to get the membraned PTFE film base fabric out of the sample while the surface layer was dissolved in water-bath. Then the force of membraned PTFE film base fabric was tested to gain the situation of the base fabric＇ s force loss rate after spunlace. The surface morphology of the membraned PTFE film base fabric was studied and the different damages were compared. It was showed that when the spunlace pressure increases, the force loss rate increases rapidly. It do damage to weft yarn mainly. Meantime, when the fiber of the surface layer was horizontal arranged, it had lower damage on the membraned PTFE film base fabric. At the same spunlacing process parameters, damage of membraned PTFE base fabric with fiber of rectangle crosswise was larger than that of PTFE base fabric with circular crosswise, and needle-punching process would produce lower damage on the material than spunlacing process.