1. Materials of aluminum foil bag: The packaging bag needs to be free of peculiar smell. Bags with peculiar smell generally make people feel that they do not meet the hygienic standards, and may also affect the normal use of the bags. If there is no odor, you need to check the transparency of the bag, whether the clarity is uniform, whether there is any impurity, etc.
2. The uniformity of the appearance; first observe the stiffness of the bag. Generally, the higher the flatness, the better, except for the different needs of the materials. For example, for a 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 cut edge of the bag is neat, the more neat the better.
3. The printing quality of aluminum foil bags: see if there is an obvious third color at the splicing of the two colors.
4. The firmness of the aluminum foil bag: The firmness of the bag is mainly divided into two types, which are in line with the firmness and the hot air firmness. Wuxi aluminum foil bags have different levels of firmness 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. It can be used to hold heavier products such as stones, large particles, etc., while the bag made of OPP heat sealing film is easy to tear. It can hold some classic 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-sealed part of the bag, it means that the heat-sealing of the bag is very poor, and the bag is easy to break during the production process; The sealing edge is torn apart, indicating that the heat sealing quality is good; it also depends on the composite firmness of the 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, then It shows that the composite firmness is good, and vice versa is poor; in addition, to check the firmness of the bag, it is also necessary to check whether there are air bubbles or wrinkles on the surface of the bag.
Post time: Sep-17-2022