1. Printing quality of aluminum foil bag: See if there is obvious third color in the splicing of the two colors. The higher the realistic level of the physical image, the better, to see if there is any phenomenon such as drawing, fogging, blocking, and printing.
2, aluminum foil bag materials: packaging bags need no odor. Bags with odors generally feel that they do not meet hygiene standards and may also affect the normal use of the bag. If there is no odor, check the transparency of the bag, whether the clarity is uniform, whether there is any impurity, and so on.
3, the firm level of aluminum foil bags: the firmness of the bag is mainly divided into two types, in line with the firmness and hot air fastness. Wuxi aluminum foil bag bags have different levels of firmness due to different materials.
The main method of differentiation is to rip the edge of the bag by hand. Bags made of nylon and high-pressure film composites are generally torn by hand and can be used to hold relatively heavy products such as stones, large particles, etc., while bags made of OPP heat-sealing film are well torn. Install some light products; after the bag is torn open, it depends on the shape and structure of the section. If it is evenly torn from the middle of the heat seal of the bag, the heat sealing of the bag is very poor, and it is easy to break the bag during the production process; Tear open, indicating that the quality of the heat seal is good; also depends on the composite firmness of the bag. The method is to first look at the structure of the crack at the crack, and then see if you can separate it by hand. If it is not easy to separate, it means The composite firmness is good, and vice versa; in addition, to check the firmness of the bag, it is also necessary to see whether there are bubbles or wrinkles on the surface of the bag.
4, the appearance of the uniformity: first observe the stiffness of the bag. Generally, the higher the flatness, the better, except for the different materials. For example, a bag made of a composite of nylon and high-pressure film, the heat seal of the bag will have a wave shape; it is also necessary to observe whether the cut edge of the bag is neat and tidy.