Things that need to be paid attention to when designing plastic packaging bags 1. High-pressure polyethylene plastic bags 2. Low-pressure polyethylene plastic bags 3. Polypropylene plastic bags 4. Polyvinyl chloride plastic bags Application scope of plastic bags 1. High-pressure Uses of polyethylene plastic bags: A. Food packaging: pastries, sugar A., ??gift bags; fruits, roasted seeds and nuts, biscuits, milk powder, salt, tea, etc.; B. Fiber product packaging: shirts, clothing, knitted cotton products, chemical fiber products; C. Daily chemical product packaging. 2. Uses of low-pressure polyethylene plastic bags: A. Garbage bags, strain bags; B. Convenience bags, shopping bags, handbags, vest bags; C. Fresh-keeping bags; D. Inner bags of woven bags 3. Polypropylene plastic bags Usage: Mainly used for packaging textiles, knitted cotton products, clothing, shirts, etc. 4. Uses of PVC plastic packaging bags: B. Luggage bags, knitting product packaging bags, cosmetic packaging bags; C. (zippered) document bags, information bags. 1. Aluminum-plastic flexible packaging and aluminum-paper flexible packaging: Since they are opaque, they can be considered according to the conventional colors. 2. Single-layer polyethylene packaging: Because it is transparent, you can consider using the color of the content as a complementary color for printing. The color of the content can be used as a pattern background or as a decorative color (window color), depending on your plan. Depends on the style. 3. The color of liquid items can be used to decorate soft packaging, such as milk, soy milk, juice, etc. 4. The color of small solid particles can also be used to decorate soft packaging, such as coffee, MSG, etc. 5. The color of large solid particles is not suitable for use in flexible packaging, such as dried candied fruits. For this kind of packaging, it is recommended to leave a transparent window on the package, or print a full opaque color on one side, and only print explanation text on the back. Make the contents transparent and visible. 6. The barcode must have a contrasting background color, and the content cannot be used as the background to avoid the barcode reader not being able to read it. 7. There are no strict regulations on text. As long as the surfaces in contact with food are not printed, the art of text is the space for design and expression. 8. As far as possible, using more colors will make it look more realistic, but the cost will go up. Generally, at least four sets of film are produced, that is, four colors. If you want to print realistically, it is best to produce seven sets of film. Plate making, that is, printing with seven colors.