Frozen vacuum packaging bags are widely used, such as: walnut, beef, mutton, dumplings, and so on. We can see these everywhere in supermarkets. In life, more and more frozen food choose vacuum packaging bag packaging, the main purpose is to keep quality and fresh.
1、 The vacuum packaging bag of frozen food has relatively good shock resistance. After being packed in vacuum, frozen food still needs to be transported, loaded and unloaded, and placed on the shelf. In these processes, the vacuum bag of frozen food is easily damaged by external forces. If the impact resistance of the vacuum packaging bag of frozen food is poor, it is easy to break the bag and open the bag, which not only affects the appearance of the packaged product, At the same time, it can not play the role of packaging itself.
2、 The smooth property is good, but the smoothness of the vacuum packaging bag itself is not good. In the production process, the performance is poor, and the production efficiency is low. At the same time, the utilization rate of the vacuum packaging bag is reduced and the cost is expended.
3、 It is a kind of vacuum bag with good heat sealing strength. The heat sealing layer is damaged due to insufficient heat sealing strength and high heat sealing temperature. The protection function of the vacuum bag is reduced, and the shelf life of the contents is greatly shortened, so that the contents can not reach the corresponding shelf life.
4、 Because of the high peeling strength, good breaking force and poor mechanical function of vacuum bag, the delamination of vacuum bag and vacuum bag can not achieve the load-bearing function and can not effectively protect the contents.
5、 The cold resistance is good. If the vacuum packaging bag fails to meet the requirements, the original function of the material can not be maintained at a lower temperature. The packaging material is relatively brittle, which will reduce the mechanical strength of the packaging material, cause the vacuum packaging bag to crack and crack, and can not be satisfied with the protection function of the contents.
6、 Easy to tear, if the easy tearing effect of vacuum packaging bag can not be effectively applied, the tear strength is too large, which makes the vacuum packaging bag hard to open, and the tear strength is too small, which will reduce the mechanical function of vacuum packaging bag. Therefore, we should not only satisfy the humanized design of easy tearing of vacuum packaging bag, but also complete the protection function of the product.
7、 Because frozen food is generally hard after freezing, especially fish and meat products, which contain bones and hard objects, it is easy to puncture the vacuum packaging bag during transportation and stacking due to the extrusion of products, which will damage the sealing property of vacuum packaging bag. Therefore, the puncture performance of frozen food is very high