长期以来,粒糖是采用蜡纸和玻璃纸为主进行包装的。上海每年用于粒糖包装,需要引进相当数量的玻璃纸,要化费大量外汇。由于玻璃纸生产过程中要消耗大量的酸、碱、二硫化碳和工业水,排放出的三废严重,国外于七十年代初期开发了可扭结型料薄膜。它是一种可供扭结而回弹性低的特种包装薄膜,由于其性能近似玻璃纸,价格 For a long time, granulated sugar and cellophane are mainly used for packaging. Shanghai is used for the packaging of granulated sugar each year. It needs to import a considerable amount of cellophane and cost a lot of foreign exchange. As cellophane production process to consume large amounts of acid, alkali, carbon disulfide and industrial water, the three wastes discharged serious foreign countries in the early 1970s developed kink-forming film. It is a kink and low resilience special packaging film, due to its approximate performance cellophane, the price