1, aluminum foil bag printing quality: look at the two color of the splicing site whether there is a clear third color, the higher the realistic level of the physical map, the better, to see if there are drawing, fog, blocking, leakage and other phenomena.
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 a sense of impurities, 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.
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.