莱诺真空泵在真空包装行业的应用

  • Article source:Industry News
  • Website editor:小编
  • Reading volume:
  • Publication time:2019-05-27 23:47:46

  真空包装应用越来越广,我国早期应用于酱菜如榨菜的包装。封装的榨菜贮存60d,质量正常,色泽不变,到300天时略带暗红色。后来大量应用真空包装土特产品。如包装烧鸡、扒鸡、猪蹄、驴肉、免肉、香肠等,市场上随处可见。
  
  糕点选用真空包装,可以延长贮藏寿命,特别是含水量相对较多的糕点,在大气下保存易变质,如蛋糕一旦气温高、湿度大,很快就会发霉,如果采用真空包装,可以存放几周。包装材料选择阻气性好、阻湿气强的复合膜。
  
  绿茶可以用真空包装方法来防止其氧化和失去香味。包装材料选择对氧高阻性的膜材,如拉伸聚丙烯、聚偏二氯乙烯、聚乙烯、牛皮纸等。包装薄膜一般用几层复合而成。复合层中需加铝箔,一般厚度为7μm~12μm,也可用真空蒸铝来代替铝箔。有了铝阻挡层之后,可以阻挡光线照射茶叶,避免裂解。
  
  我国南北方人都爱吃的年糕,通过真空和高温加压杀菌也能长期保存,很适合于自选商场销售。加热包装杀菌时,要膜层强度高,耐热且气密性好。使用聚乙烯膜厚度为60μm~70μm。

真空包装的应用

  
  豆酱是人们喜爱的大众化调味品,制成的豆酱中都含有酵母菌,在一定温度和湿度下,酵母菌会迅速繁殖,产生二氧化碳,使酱发泡,进而引起发霉与变色。抑制酵母菌可用加热方法或放入添加剂。若采用高阻性材料进行真空包装,既比瓶装方便,又可以保鲜,其贮藏时间大为增长。通常使用复合膜包装,一般内层的聚乙烯厚度为50μm~70μm。

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