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爲什麽拉伸膜會存在靜電的現象

作者：兴亚缠绕膜閱讀量：发布日期：2023/2/25 15:14:47

信息摘要：

許多客戶在使用拉伸膜時出現靜電的現象，這是爲什麽呢？主要是哪些原因造成的呢？接下來我們跟隨小編一起來了解一下：

1、生産拉伸膜時産生的靜電
因爲粒料間互相摩擦，熔體和模頭的摩擦，成膜收卷時和導輥摩擦，導致拉伸膜膜在出廠時就産生了靜電。所以，薄膜生産過程中要添加抗靜電劑來消除這部分靜電。應該說這樣效果還是很好的。抗靜電劑是一些表面活性劑，其中分子中含有極性的親水基和非極性的親油基。

親油基與塑料有一定的相溶性，親水基可以電離或者吸附空氣中的水分，在薄膜表面形成一層很薄的導電層，用來泄漏電荷，從而達到消除靜電的目的。

2、印刷、複合、分切、制袋過程中産生的靜電

因爲拉伸膜和導輥的摩擦、高速運行的薄膜和幹燥空氣的摩擦等原因，使得薄膜産生靜電。這部分的靜電對生産的影響是最大的，而且如果不能有效地消除，對後加工工序也會告成很大的影響。

一般來說，采用超導靜電毛刷(接觸式消除)是比較有效的，它是以接觸薄膜的方式，將産生的靜電通過電阻很低(1m寬幅電阻小于1)的毛刷接地導出來解決這個問題。也可以采用離子發生器形式，將産生的離子以風的形式吹到薄膜上解決(非接觸式)。但在實際操作中，離子氣在消除薄膜所帶靜電的同時會發現，運轉的薄膜同時還會攜帶一部分空氣中的電離子進入收卷。

3、成品薄膜在自動包裝機上産生的靜電

成品薄膜與設備導輥的摩擦、薄膜本身沒有被完全消除靜電等原因。造成自動包裝困難以及需要的內容物對靜電敏感，這時也可以采取上面的辦法進行消除靜電。最有效的辦法也是采用超導靜電毛刷的方法來消除。

可以看出，拉伸膜也存在靜電的，所以這時候防靜電拉伸膜相對于一般的拉伸膜來說，性能更加優秀，不會因爲在打包時因靜電而産生不必要的麻煩。

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爲什麽拉伸膜會存在靜電的現象

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