1. The first is the material of the aluminum foil bag: smell the special odor before purchasing the sample. If there is a peculiar smell, it will not meet the hygiene standards, and it may also affect the normal use of the aluminum foil bag. If there is no special odor, you can check the transparency of the aluminum foil bag, whether the clarity is uniform, whether there is a sense of impurities, etc. Second, look at the firmness of the aluminum foil bag: the firmness of the aluminum foil bag is mainly divided into two types, which are in line with the firmness and the hot air firmness. Aluminum foil bags have different firmness levels due to different materials. The main difference is to align the edge of the bag and tear it by hand. The bag made of nylon and high-pressure film is generally difficult to tear by hand, and can be used to hold heavier products such as semiconductor items, large particles, etc., while the bag made of OPP heat-sealing film is easy to tear. Only some light products can be loaded; after the bag is torn open, it depends on the shape and structure of the cross-section. If it is torn evenly from the middle of the heat-sealed part of the bag, it means that the heat-sealing of the bag is poor and it is easy to break during the production process. The sealing edge is torn apart, indicating that the heat sealing quality is good; secondly, it depends on the composite firmness of the packaging bag. The method is to first see how many layers of structure there are at the crack, and then see if it can be separated by hand. If it is not easy to separate , it means that the composite firmness is good, if it is slightly pulled apart, it means that the quality is poor; so to check the firmness of the aluminum foil bag, it is also necessary to check whether there are air bubbles or wrinkles on the surface of the packaging bag. 3. Look at the uniformity of the appearance of the aluminum foil bag: first observe the flatness of the aluminum foil bag. Generally speaking, the higher the flatness, the better, except for the different needs of the materials. For example, for the packaging bag made of nylon and high-pressure film, the heat sealing part of the bag will have a wave shape; it is also necessary to observe whether the cutting edge of the packaging bag is neat or not. , the neater the better. 4. Look at the printing quality of aluminum foil bags
: For the printing quality of aluminum foil bags, look at the physical map. The higher the level of fidelity, the better. Secondly, check whether the bag has wire drawing, fogging, blocking, missing printing, etc. If this happens, it means that the printing requirements are not standard. Now most aluminum foil bag manufacturers are cutting corners. Remind the majority of users to pay attention to the above points to identify the quality of aluminum foil bags when purchasing aluminum foil bags, and judge from the materials used for aluminum foil bags, the firmness of the bags, the uniformity of appearance, and the printing quality of the aluminum foil bags;
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