点击图片查看原图
并丝是多根单丝缠结在一起而形成小丝束固结在无纺布表面上的现象。它对非织造布的外观质量影响很大,特别是对于薄型产品,看上去特别显眼,各生产厂家对此问题都十分关注。从气流牵伸原理我们知道,气流牵伸是靠高速气流与长丝之间产生的摩擦力实现的,在摩擦力作用下,不但使长丝得到牵伸,同时也使其带上大量静电荷,由于有静电
的排斥作用,加上气流在接近网面时的扩散作用,正常是不会产生并丝的.
扩散风道的进口宽度要大于牵伸风道出口宽度,扩散风道出口宽度在负压牵伸装置中较宽,在正压牵伸装置中较窄。牵伸风道与扩
散风道之间的幅宽方向留有自然补风间隙,此间隙的大小决定补风量的多少,补风是由于牵伸气流高速经过牵伸风道产生负压场而吸入的,补风的均匀性直接影响铺丝,对布面的均匀性影响较大.
除提高纺丝张力外,熔体挤出速度和冷却速率也会影响丝条中取向的形成,对纤维的最终性能也有重要影响。在侧吹风冷风风量和冷风压力一定时,挤出速度提高,会降低丝条牵伸作用;而过快地冷却,同样也会降低对丝条的牵伸作用,所以牵伸气流速度与狭缝宽度的选择应与熔体挤出速度和冷却 风温度相配合,才能取得较好的牵伸效果。既保证不产生过多的断丝,又保证丝条得到充分牵伸,取得较高的取向度, 从而提高丝条和无纺布的产品质量。针对不同风温与保障正常纺丝所能承受的最高风压(牵伸气流速度)之间的关系问题.![](http://zs1.img-1.com</div>
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