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PVC压延膜穿孔问题分析

文字:[大][中][小] 手机页面二维码 2021/1/12     浏览次数:    

穿孔的产生主要有以下3种情况:物料太脏,过滤网细度不够;四辊压延机有冷料混入;填充物料和增塑剂的影响。

情况1:可通过加大过滤网细度及更换过滤网频率来解决;如仍有穿孔产生,则考虑更换物料。

情况2:可通过控制各辊筒间的存料来解决;另外应尽可能把物料塑化,以免有未塑化的生料混入,还要控制好各机器的速比,尽可能减少由此产生的孔洞问题。

拉伸薄膜的穿孔要明显得多,这是因为双向拉伸薄膜受到的拉伸力是双向的,2m宽的薄膜如果拉宽到5m,则拉伸比为215.1mm的孔洞经过拉伸后就变成215mm。事实上孔洞要比215mm大,这是因为孔洞周围应力集中,容易受到破坏。所以,解决好拉伸薄膜的穿孔问题非常重要。

情况3:填充材料主要使用轻质碳酸钙,适量的碳酸钙可增加薄膜的强度,但当碳酸钙用量达到50~60份(相对100份PVC)时,薄膜撕裂强度明显降低,这时拉伸薄膜的穿孔明显增多。因此,控制好碳酸钙的用量也是减少拉伸薄膜孔洞的一个重要因素。增塑剂用量增加时由于薄膜变软、断裂伸长率增加而使孔洞减少,反之,则孔洞增加。

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