How to judge the quality of vacuum packaging bags?

　　Nowadays, vacuum packaging bags are becoming more and more popular in the plastic packaging market, and their status is also increasing. It is precisely because of its good packaging performance that it is widely used. It has strong functional requirements of oil resistance, moisture resistance, high temperature cooking resistance, low temperature freezing resistance, quality and taste preservation, etc; It also has a high barrier property, which can block the infiltration of oxygen, water vapor and other gases; And its production cost is low, which can meet the automation and large-scale production technology of modern packaging; Safety, health, no pollution and other advantages. Then the problem arises again. How to judge the quality of vacuum packaging bags? I'll tell you secretly!

　　First, we need to observe whether the appearance of this vacuum packaging bag is complete, which is a basic step to check its quality. We need to carefully check the appearance of the bag for obvious scratches or pinholes. If not, congratulations, this is a high-quality vacuum bag.

　　Secondly, check whether the vacuum packaging bag is firmly sealed and whether it can meet the product packaging effect. In fact, it is very simple. We can reach into the bag and tear it in the opposite direction. If the vacuum packaging bag is deformed in the process of tearing and the sealing part does not fall off, the sealing part of the vacuum packaging bag is firm and qualified.

　　It is also important whether the vacuum packaging bag is permeable, including its oxygen permeability, water permeability, moisture permeability and other properties. During the test, you can use the coloring method. Place the colorant in a vacuum bag for sealing, and then place the vacuum bag horizontally on the filter paper. After a period of time, observe whether the filter paper is discolored, and repeat the test to ensure whether the permeability of the vacuum bag meets the standard.

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