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同是纏繞膜爲什麽有的就不能拉伸呢？

作者：兴亚塑料包装閱讀量：发布日期：2022/7/11 14:30:56

信息摘要：

纏繞膜也叫拉伸膜，兩個名稱指的是同一個東西。纏繞膜的概念更廣一些，有的纏繞膜可拉伸，有的纏繞膜不可拉伸，或者說拉伸率低，所以拉伸膜是屬于纏繞膜的範疇。

纏繞膜，又叫拉伸膜、熱收縮膜，國內早以PVC爲基材，DOA爲增塑劑兼起自粘作用生産PVC纏繞膜。由于環保問題、成本高(相對PE比重大，單位包裝面積少)、拉伸性差等原因，當1994——1995年國內開始生産PE拉伸膜時逐步被淘汰。PE拉伸膜先是以EVA爲自粘材料，但其成本高，又有味道，後發展用PIB、VLDPE爲自粘材料，基材現在以LLDPE爲主，包括C4、C6、C8及茂金屬PE(MPE)。

早期LLDPE拉伸膜以吹膜爲多，從單層發展到二層、三層；現在以流延法生産LLDPE拉伸膜爲主，其流程見下圖，這是因爲流延線生産具有厚薄均勻、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。單、雙層流延在材料選擇上沒有三層流延的廣，配方成本也高，所以還是以三層共擠的結構較爲理想。優質的拉伸膜應具有透明度高，縱向伸長率高，屈服點高，橫向撕裂強度高，穿刺性能好等特點。

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同是纏繞膜爲什麽有的就不能拉伸呢？

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