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1．前言复合膜是将两种或两种以上具有不同功能的膜贴合在一起而形成的具有一定功效的包装材料，其优点就是能够把不同性能的材料合理组合，取长补短，从而提高整体性能。我国于70年代后期开始陆续从日本、意大利等国引进各种复合机，迄今为止，已有复合膜生产线150多条，年生
1. Introduction The composite membrane is a kind of packaging material with certain functions formed by laminating two or more films with different functions. The advantage of the composite membrane is that it can combine different performance materials reasonably and complement each other to improve the overall performance. In the late 1970s, China began to introduce various types of laminating machines from Japan and Italy. So far, more than 150 composite film production lines have been manufactured.