目前,塑料包装材料正朝着复合方向发展。作为复合薄膜家族中的共挤薄膜,由于具有一系列独特的优点,得到了迅速发展。共挤法可生产极薄(如2μm)的膜层,能经济合理地利用材料,而其它方法难以生产这么薄的膜层。单层薄膜加工最薄厚度为40μm,而作为共挤复合薄膜主体材料,厚度可减薄为10～20μm,共挤法是一步成型工艺,工艺简单,加工费用低;不需要溶剂性粘合剂,因此不会污 At present, plastic packaging materials are moving in the direction of the composite. As a coextruded film in the composite film family, it has been rapidly developed due to its unique set of advantages. The coextrusion process produces films that are very thin (eg, 2 μm), make the materials cost-effective, and other methods make it so difficult to produce such thin films. The thinnest thickness of the single-layer film processing is 40μm, while as the main material of the co-extruded composite film, the thickness can be reduced to 10 ~ 20μm, co-extrusion method is a one-step molding process, the process is simple, low processing costs; , So will not be dirty