The same is milk, not the same packaging means å•¥? Even if you do not eat milk, it does not mean that you really understand it, Xiaobian today to tell you about milk packaging materials, what are the emphasis?
Common milk packaging materials are as follows:
1, Tetra Pak
This most commonly used milk package is made up of six layers of paper, aluminum and plastic. Instilling milk into the Tetra Pak is a completely closed operation, so there is no air in the package. This special composite packaging material and infusion process allows the package to effectively separate milk from air, bacteria and light, so Tetra Pak's milk has a longer shelf life;
2, Bailey bag
Do not look at the Bally bag only a thin layer, it is made of three layers of black and white aseptic composite film, and now there are even 5 layers, 7 layers of co-extruded film and aluminum-plastic composite film packaging. This packaging material has a barrier to oxygen that is more than 300 times that of ordinary plastic films. Different materials, the shelf life of milk Gabriel package is different, but can reach more than 30 days.
3, aseptic plastic bags
Unlike the multi-layered bag, the aseptic plastic bag can be thinner. It has only a black layer inside, and the effect of isolating light and oxygen is not as good as the former. Milk shelf life is generally shorter, and such milk is also sold in supermarket refrigerators.
4, roof box
The outer layer of the milk packaging material is a mold, the middle layer is a fiber, and the inner layer is divided into a cold-filled paper layer and a hot-filled aluminum foil. The difference in material determines the shelf life of hot and cold filling: cold filling is generally short, from 7 days to 30 days, while hot filling can reach 3 months or even one year. If you buy this kind of packaging, you can see the shelf life.
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