缠绕膜，又叫拉伸膜、缠绕膜从单层发展到二层、三层;以流延法生产 LLDPE拉伸膜为主，这是因为流延线生产具有厚薄均匀、透明度高等优点。我们公司采用的就是三层流延。优质的拉伸膜应具有透明度高，纵向伸长率高，屈服点高，横向撕裂强度高，穿刺性能好等特点。

Stretch film develop from single laver to two and three lavers;LLDPEstretch film is mainly produced by casting method because the production of the casting line has the advantages of balanced thickness and high transparency. Our company is using the most advanced three lavers ot casting.Hiah-quality stretch film are provided with hiah transparency. high longitudinal elongation, high yield pointhigh penetration etc.