Because PET material occupies an important position in variable information printing, it belongs to film printing, which is very different from paper-like materials in the printing process. 1. Material characteristics PET film is a plastic film material with medium and low surface energy. It needs surface pretreatment before printing to increase the surface removal energy or wetting ability. Otherwise, the ink and ribbon will not be firm and easy to fall off. 2. Basic methods of surface pretreatment a. Corona treatment. Through the method of high-voltage discharge, the surface energy of the material is increased. There are two methods of pre-processing by the supplier in the production of materials and online processing on the printing press. The surface tension of the film after treatment is required to reach 38 dyn or more. b. Surface coating. Pre-coat the surface of the material with a coating of affinity ink, such as using corona-free PET film surface treatment agent and PET film surface treatment agent to improve its wetting ability to ink and increase the firmness of ink. This processing method is the most ideal, common and stable method for PET materials. 3. Printing method a. Printing and laminating method. Use Xitong offset printing to draw the ink, and immediately cover the matt PET or BOPP film for die cutting after printing, and there is no ink drying problem. This kind of processing does not have any requirements on the surface characteristics of the material, and the PET or BOPP on the matt surface can be used for ribbon printing. b. Printing and glazing method. Using UV ink, on-line printing and UV light varnishing on the rotary labeling machine. The glazing process can adopt the whole glazing or partial glazing, and the printing parts are reserved. This method is also a method commonly used by customers. c. UV printing method. Use UV ink to print. There is no need for laminating or glazing, and the printing area is reserved. d. Printing and drying method. Using special oxidation polymerization type quick-drying special ink, after printing, it is dried by hot air drying tunnel, and finally rewinding. e. Natural drying method. This type of label is usually used for manual labeling, so the processing method adopts the method of cutting the roll after printing. After printing the label, it is naturally dry to put on the shelf after cutting. Similarly, the ink used is a special oxidation polymerization type quick-drying special ink. Fourth, quality assurance a. The surface of the material must be pre-treated and meet the standard. b. Use matching special inks, varnishes and ribbons, which should be tested in advance. c. Control the thickness of the ink layer and dry it thoroughly, and pay attention to the ink overprinting part to prevent the ink in the lower layer from drying out. 5. Die-cutting a. Use a small-angle die-cutting blade, 42 degrees is recommended. b. Use hard die-cutting blades made of alloy materials. c. Keep the sharpness of the blade. d. Be careful not to die-cut film materials again with the die-cutting knife that has die-cut paper. e. Use hard liner, pay attention to flatness, otherwise die-cutting quality problems will easily occur. Is a company specializing in the production of PET film with multiple functions, such as: transparent PET film, milky white PET film, release PET film, supply of PET motor film, etc. With a wide variety of products, affordable prices, and environmental protection, we provide customers with excellent quality and service based on the service tenet of excellence in production, honesty and trustworthiness in distribution, and warm and thoughtful service, and the spirit of assisting partners to achieve their own businesses. Interested parties welcome to inquire!