In order to protect the quality of self-adhesive labels and the quality of labels, many surface coatings have been selected for lamination, glossing, and bronzing. First, sticker UV coating The glazing process is mainly applied to the surface coating of mirror coated paper and coated paper labels. The purpose is to increase the glossiness of the surface and achieve the functions of antifouling, moisture prevention and pattern protection. According to the processing method, the coating of the self-adhesive label material is divided into light on a single sheet of paper and light on a web of paper, wherein the light on the web of paper is the most commonly used method in the label printing process. The coating of web labels was carried out on a turn label machine. At present, the UV coating process is commonly used, that is, a layer of UV coating is evenly coated on the printed pattern surface. For water-based ink flexo labels, glazing is an indispensable process. UV glazing process should pay attention to the following issues: 1. Verification of Varnish Quality UV Varnish varieties are numerous, have a certain storage period, and have certain requirements for the environment, so that before the use of Sichuan should check the color of coating oil and its drying after quantitative coating, and additives matching Situation, but also pay attention to observe whether there is a reaction with the printing ink used. General requirements of the first glazing test, and then put into normal production. 2. Coating thickness The leveling properties of UV varnish are not as good as those of solvent type varnish. If the coating amount is too large, streaks will appear on the surface after polishing, which will affect the light reflection effect. If the coating amount is too large, the glazing oil will not dry completely, and only the surface layer will be dry, resulting in adhesion after rewinder. 3. Varnish viscosity and surface tension Varnish viscosity has an effect on its leveling properties, drying speed, and surface gloss. According to different paper, adjust the appropriate viscosity. While controlling the viscosity, it is also necessary to pay attention to the variation of the surface tension of the coating oil. The surface tension of the varnish must be less than the surface tension of the ink layer of the printed matter. In this way, the varnish can completely wet the varnish surface to avoid quality problems such as pinholes and streaks. 4. Speed, coating amount, pressure, drying temperature The coating speed, coating amount, pressure, and drying temperature of the coating are mutually restricted, and the relationship between the coating and the absorption of the coating oil on the surface of the paper must be properly adjusted. 5. Regularly check the UV drying device The UV lamp in the UV drying device gradually reduces the effective power with the use of time. The effective time of the UV lamp is 1000 hours. The effective power should be regularly tested during production and should be replaced when the time of use is close to 1,000 hours. (to be continued)
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