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                                                                                                                                              如何區分昆山纏繞膜和拉伸膜

                                                                                                                                              發布日期:2020-12-31


                                                                                                                                              昆山纏繞膜和拉伸膜有什么區別?兩個稱號指的同一個東西,昆山纏繞膜的概念更廣一些,昆山纏繞膜也叫拉伸膜,有的昆山纏繞膜可拉伸,有的昆山纏繞膜不可拉伸,或者說拉伸率低,所以拉伸膜是屬于昆山纏繞膜的范疇。

                                                                                                                                              昆山纏繞膜又名拉伸膜、熱收縮膜,國內最早以PVC為基材,DOA為增塑劑兼起自粘效果出產PVC昆山纏繞膜。但其成本高,PE拉伸膜先是以EVA為自粘材料,又有味道,后發展用PIBV、LDPE為自粘材料,基材現在以LLDPE為主,包括C4、C6、C8及金屬PEMPE。

                                                                                                                                              從單層發展到二層、三層;現在以流延法出產LLDPE拉伸膜為主,前期LLDPE拉伸膜以吹膜為多。這是因為流延線出產具有厚薄均勻、透明度高等長處,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,應用領域遭到局限。單、雙層流延在資料選擇上沒有三層流延的廣,配方利息也高,所以還是以三層共擠的結構較為抱負。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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