how to distinguish the quality of aluminum foil packaging bags?

When the material is purchased, you can smell whether there is any peculiar smell. If there is no peculiar smell, you can check the transparency of the package to see if there is any sense of impurities. There are two main types of firmness: consistency firmness and hot air firmness. Due to different materials, the degree of fastening of the Wuxi aluminum foil package is different. The main way to distinguish is to tear open the edge of the bag by hand. Bags made of nylon and high-pressure membranes are generally difficult to tear open by hand, and can be used to hold heavy objects such as stones and large particles. The bag made of OPP heat-sealing film is easy to tear and can only hold some light products; after the bag is torn, it depends on the shape and structure of the cross section. If it is torn evenly from the middle of the heat seal of the package, the heat sealability is not good and it will be easily broken. If it is torn from the sealing edge, it indicates that the heat sealing quality is better; it also depends on the composite firmness of the aluminum foil packaging bag. The method is to first look at the structure of several layers at the cracks, and then see if they can be separated by hand. If it is not easy to separate, it means that the composite firmness is good, and vice versa; therefore, the firmness of the bag should be checked, and whether there are bubbles or wrinkles on the surface of the bag.