Printing large area on the ground and the virtual phenomenon and its solution
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In flexographic printing production, packaging logistics due to problems such as paper, anilox roller, ink, printing pressure, etc., often encounter large-scale field vaginal, hair-flowering and other phenomena.
In packaging printing, such problems are particularly serious when using paper with a low surface smoothness and easy to fall off powder. A flexographic printing machine always feels insufficient ink layer in daily production, especially when printing large areas on the ground. Thick and full. After adjusting the viscosity of the ink, 2 increasing the printing pressure, the two methods are adjusted. This phenomenon is alleviated at a low speed of 30-50 m/min, but the phenomenon reappears when the speed is gradually increased by 80 m/min or more. The faster the speed, the more obvious the phenomenon of vaginal hair.
Because the anilox roll is prepared to limit the packaging of the washing article, and can not be used for secondary printing, it can only be solved from other aspects, and it is observed that the printing machine web roller blade is a reverse blade. Due to the shearing force of the ink, and because the printing pressure can not be too large, the ink is actually reduced. With this idea, then the amount of ink should be considered, so the direction of the adjustment blade is changed to the positive blade installation, and the machine is turned on. In trial printing, this phenomenon is improved and the effect is more pronounced at high speeds. Since then, in production, we have selected forward or reverse scraper installation according to the nature of printing, printing plates, etc., and such problems rarely appear. However, in practice, this method should be flexibly applied according to the quality requirements of the printed products.