UV glazing process capable of replacing film-coated film sticker surface
Printing on the surface of the film material is a common situation in the label printing industry. Since the film material does not absorb ink, the ink layer is only attached to the film surface, so the firmness and scratch resistance of the ink layer is to ensure the quality of label printing. Key elements. In practical applications, although the ink adhesion fastness of film labels has met various standards through various tests, the problem of scratch resistance of the ink layer has not been fundamentally solved. For example, some domestic cosmetics customers often put the labeled plastic bottles directly into the packaging box without any partitions or fillers between the bottles, and then ship them to various places for sale. This makes it very easy for bottles to interact with each other during transportation. Collisions, frictions, etc. will eventually cause the ink on the surface of the bottle body to wear seriously, and the product cannot be sold normally. In order to solve the problem of ink layer wear, in addition to the brand manufacturers have to make changes in product packaging, printing companies usually use three other methods to solve: directly use screen printing on the bottle body, use the thickness of the ink and Strength to improve the abrasion of the ink layer; composite BOPP film on the surface of the film sticker after printing to protect the ink layer; UV coating process is used on the surface of the film material to protect the ink layer. After a comprehensive comparison, the author believes that the UV glazing process is the most ideal solution. The reason why UV glazing can replace the film 1. Does not change the physical properties of the film material The thickness of the UV varnish after curing is generally 2 to 5 μm, which can be integrated with the ink layer and has little effect on the overall thickness of the label. In addition, the film material will not affect its own deformation and bending ability due to the glazing layer, maintaining the flatness of the label itself, and avoiding the phenomenon of warping and falling off of the label on the surface of the bottle body. 2. It can eliminate some static electricity During the UV glazing process, static electricity is basically not generated. At the same time, a destaticizer can be added to the varnish to eliminate some of the static electricity on the surface of the printed matter, so that the die cutting, waste disposal, cutting or rewinding after glazing can be processed. The process is carried out smoothly, and various labeling problems caused by static electricity will not occur when the end customer labels. 3. Can be quickly glazed online The speed of the printing press will not be affected by the glazing process, and it can still be printed quickly. Usually the average speed of the flexographic printing machine when printing labels with complex graphics is 60 ～ 100m / min, without changing the Paper in the middle without stopping the machine; while using the laminating process, the speed is 30 ～ 40m / min, and frequent shutdowns are required. Replacing the composite film will affect the registration accuracy and ink uniformity. Therefore, the glazing process improves production efficiency to a certain extent and reduces material loss. 4. Reduce the overall cost of label prints The cost of UV glazing process is much lower than the cost of composite BOPP film. General label companies will recommend customers to use varnishes with high transparency, scratch resistance, small shrinkage, fast curing and high strength. The price of this kind of varnish is generally about 150-200 yuan / kg, calculated based on 2 grams per square meter, the cost per square meter is 0.3-0.4 yuan, and the price is almost one-tenth of the price of the composite film. , So it reduces the overall cost of label printing. Based on the above reasons, it is recommended that label companies use UV glazing technology to protect the ink layer after printing on the surface of the film sticker. Some experiences to ensure the quality of UV coating For the glazing process, from the author's production practice in recent years, especially through the repeated experiments on the Arsoma-280 flexo printing machine and IGT printing suitability instrument in the past one or two years, I have summarized many experiences and are here with my colleagues share together. (1) It is recommended to use UV varnish and auxiliary agent matching with the ink, otherwise it will affect the firmness of the glaze layer, and even cause a chemical reaction between the ink and the varnish. (2) It is recommended to use high-quality, scratch-resistant high-grade glazing oil for film materials, because this type of glazing oil has special additives that can increase the friction resistance of the glazing layer and protect the ink layer. (3) The ink and glazing oil must be cured thoroughly (you can test separately to confirm that the ink is cured before glazing), otherwise its firmness and scratch resistance cannot reach the maximum strength. Conditional customers can arrange multi-station curing to ensure that the ink and varnish are fully cured. In addition, label companies may wish to actively communicate and cooperate with materials and ink suppliers in their daily production. It is believed that the UV glazing process on the surface of thin film stickers will replace the laminating process and become more mature. Box Tissues,Kleenex Box,Facial Tissue Box,Kleenex Tissue Box ShanDong YongFang Sanitary Products Co.,Ltd , https://www.sdyongfang.com