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用于食品包装的材料除了金属,玻璃之外,近几年来,合成高分子材料——塑料的应用日益广泛,塑料包装的最大特点是可以用人工方法很方便地调节材料的性能,可以制成柔软的薄膜或硬质容器,以满足各种不同的需要。单层的塑料薄膜往往不能完全满足食品包装的要求,于是人们把多层种类相同或不同的包装材料结在一起,制成复合软包装材料。这种材料对光线,氧气,水分及其他气体的阻隔性能良好,而且经济,方便。构成软包装材料主要是合成高分子材料,包括醋酸纤维素、丙酸纤维素、乙基纤维素、甲基纤维素、尼龙、聚
In addition to metal, glass, in recent years, the application of synthetic polymer materials - plastic is increasingly widespread, the most prominent feature of plastic packaging is that it can be easily adjusted by manual methods, the material properties can be made Soft film or rigid container to meet a variety of different needs. Single-layer plastic film often can not fully meet the requirements of food packaging, so people to the same type or different types of packaging materials together, made of composite flexible packaging materials. This material on the light, oxygen, moisture and other gas barrier performance is good, and economical and convenient. Constitute flexible packaging materials are mainly synthetic polymer materials, including cellulose acetate, cellulose propionate, ethyl cellulose, methyl cellulose, nylon, poly