目前几乎所有的食品,不论多少,都用塑料包装。各种塑料由于固有的特性,可以增高食品的保存性和防止食物中毒,效果很好。但另一方面,包装材料能引起食品污染和其本身可成为废弃物,而引起公害。用塑料作食品的包装材料,最重要的是要对内容物无害,塑料对食品无移行性,其本身在化学上很稳定,但当其在成型加工和使用时,或多或少地加上一些添加剂, Almost all the food, no matter how many, is packed in plastic. All kinds of plastic because of the inherent characteristics, can increase the preservation of food and prevent food poisoning, the effect is very good. On the other hand, packaging materials can cause food contamination and can themselves become waste, causing pollution. Plastic packaging materials for food, the most important thing is to be harmless to the contents of plastic non-migratory food, its own chemically stable, but when it is used in shaping and processing, more or less plus On some additives,