塑料包装材料自七十年代以来得到了迅速发展,在世界各国包装材料组成中,塑料已占10～20％,其中百分之八十以上是聚烯烃类塑料。下面是日本发表的八○年所消耗包装材料组成(表1)和各种树脂使用情况(表2) Plastic packaging materials have been developed rapidly since the seventies. Among the packaging materials in the world, plastic accounts for 10% to 20%, of which over 80% are polyolefin plastics. The following are the composition of the packaging materials consumed in Japan published in 1980 (Table 1) and the use of various resins (Table 2)