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爲什麽pe拉伸膜拉伸時只會變薄不會破損

作者：兴亚缠绕膜閱讀量：发布日期：2022/7/21 11:55:03

信息摘要：

由于pcv纏繞膜不環保、成本高、拉伸性還不好等原因已經被pe纏繞膜所替代，這就是爲什麽拉伸膜拉伸只會變薄而不會破損的原因。

一、材質

pe拉伸膜開始是用的EVA自粘材料，由于成本高，味道大等缺點，後續采用PIBVLDPE爲自粘材料，目前主要使用LLDPE爲主。現在不僅穩定生産加工過程，提高了産量，還降低了薄膜的厚度，並簡化樹脂原料的采購，能夠應對生産環境進行改變，是一種生産高韌性的透明度高的薄膜茶農，可以顯著的提高薄膜的透明度。

二、工藝

早點的拉伸膜主要是以吹膜爲主要的，由單層發展到二層、三層，現在以流延法生産LLDPE拉伸膜爲主，又由于拉伸膜的分子量分布窄，加工範圍也窄，加工條件難以控制，通常添加5%的LDPE，以降低熔體粘度，增加拉伸膜的平整度。流延法生産具有厚薄均勻、透明度高等優點，可適用于高倍率預拉伸的要求。由于單層流延做不到單面粘，應用領域受到局限。所以還是以三層共擠的結構較爲理想。生産出的拉伸膜厚薄均勻，拉力好，不容易斷裂。

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