软罐头包装袋又称高温蒸煮袋,它是采用由聚酯、铝箔、聚烯烃等材料复合而成的多层复合薄膜制成的软质包装容器。随着技术水平的提高,新材料的不断出现,目前由两层、三层复合而成的高温蒸煮袋得到了较广泛的应用。就三层复合袋来说,它的内层一般称作封口层,经常采用的是聚丙烯塑料和聚乙烯塑料,这两种塑料都有价格低,封合性能好的特点;中间层是阻挡层,作用是阻挡氧气、有害微生物的侵入,可以采用铝箔、聚酯塑料、尼龙等材料;外层是加强 Soft canned bags, also known as high-temperature cooking bag, which is made of polyester, aluminum foil, polyolefin and other materials made of multi-layer composite film made of flexible packaging containers. With the improvement of technology and the continuous appearance of new materials, the current high-temperature cooking bags made of two layers and three layers have been widely used. The three-layer composite bag, its inner layer is generally called the sealing layer, often using polypropylene and polyethylene plastic, both plastic have low price, good sealing properties; the middle layer is a barrier Layer, the role is to block oxygen, the intrusion of harmful microorganisms, you can use aluminum foil, polyester plastic, nylon and other materials; the outer is to strengthen