How to distinguish the quality of aluminum foil bag 1. […]
How to distinguish the quality of aluminum foil bag
1. Aluminum foil bag printing quality: to see whether there is an obvious third color at the joint of the two colors, the higher the realistic level of the physical map, the better, to see whether there are wiredrawing, fog plate, block, missed printing and other phenomena.
2, aluminum foil bag material: packaging bags need no smell. Bags with odor generally do not meet hygienic standards, and may affect the normal use of the bag. If there is no smell, you need to check the transparency of the bag, clarity is uniform, whether there is impurity, and so on.
3. Firm level of aluminum foil bags: the bag is mainly divided into two kinds of firmness, in line with the firmness and hot air firmness. The aluminum foil bag bags in Wuxi are different from each other because of their different materials.
The main distinguishing method is to tear the edges of the bags with their hands. Bags made of nylon and high-pressure membranes are usually hard to tear open by hand and can be used to hold heavier products such as stones, large particles, etc. The OPP heat-sealed bags are easy to tear open and can only be filled with lighter products; when the bags are torn, the shape and structure of the cross-section should be considered, if it is from the middle of the heat-sealed bag. Uniform tear, indicating that the bag is very poor heat seal, easy to break in the production process; if it is torn from the edge of the seal, indicating that the quality of heat seal is better; but also to see the bag's composite firmness, the method is to first look at the cracks in a few layers of structure, and then hand to see if it can be separated, if not easy to separate, it shows the composite firmness Good, otherwise bad; in addition, to check the bag's solid level also depends on whether there are air bubbles or wrinkles on the surface of the bag.
4, the appearance of regularity: we must first observe the stiffness of the bag. The higher the flatness is, the better it is, except for the different needs of the material. For example, nylon and high-pressure film composite bag, the bag's heat seal will be wavy; also need to observe whether the cutting edge of the bag is neat, the neater the better.