In the printing process, a key indicator that people often pay attention to is overprinting, because the waste caused by overprinting often accounts for a large proportion of all waste. Although flexographic press manufacturers have provided a good basis for precision overprinting during design and processing, automatic monitoring systems also provide guarantees for precise overprinting, but the skill level and proficiency of the operator also have a great influence on overprinting accuracy. . If you can make some adjustments for convenient overprinting when designing the ink map, it can greatly reduce the difficulty of printing and reduce the scrap rate. The easiest way to do this is to use the reverse white text when designing the original ink, or to hollow out between the two colors to form a reversed white outline. You can also cover the third thicker one at the edge of the two color overprints. Dark outlines, for the printing of finer prints, Trapping technology can be used. The amount of trapping depends on the accuracy of the press, the quality of the paper used for printing, and the level of the operator. Trap processing is easy to implement on a computer. If there is no computer, only the ready-made color separation film can use a special trapping processor (TrappingModifier) ​​to input the trapping value, and the machine will automatically generate a trapping process. Film. If there is no trap processor, you can put a transparent spacer between the color separation film and the copy film, and use a single point light source to copy the machine. You can also get a similar effect. This article will introduce you to the ink. The angle of the knife.
Such periodic fluctuations not only have a certain influence on the plate roller base, but also the effect on the doctor blade is very obvious. The long time vibration will make the doctor blade scrape dirty, resulting in dirty version. A phenomenon occurs. By increasing the pressure on the doctor blade pressure, the problem can be solved in a short period of time, but the problem cannot be solved fundamentally, and it also has a significant impact on the service life of the doctor blade.
The polishing quality of the surface of the plate roller is mainly manifested by the number of burrs around the cell. The good quality plate has a clean, no burr, and the cells are clear and there are no impurities inside. This ensures that the plate roller does not damage the doctor blade during the printing process. After the squeegee is frequently replaced, if there is still a ruled line on the printed product, it can be generally determined that there is a problem of polishing quality of the plate roll.
Therefore, the pH of water-based inks is regarded by today's flexographic printing industry as one of the most critical factors controlling the production process. In a sense, pH control is even more important than viscosity control. We recommend users to adjust the pH value. Viscosity is linked for monitoring. This is a new attempt, and it is best to prepare a simple pH indicator in addition to the viscosity cup. The operator must not only understand the pH values ​​of the various ink additives used, but also their changes, and should strictly follow the technical data provided by the supplier when printing. As for the degree to which the viscosity and pH should be controlled, we believe that the more accurate it is, the better it is. Because water-based inks have only one optimum match between pH and viscosity, water-based inks can be adapted to printers, anilox rolls, ink transfer systems, flexographic plates, substrates, drying systems, and shop environments. An external environment consisting of. Experience has shown that when overprinting another color over a color, the viscosity of the ink should be gradually increased and the pH of the ink gradually reduced. This helps to dry the ink and prevents the post-printed ink from drying the already printed, dried ink again, which affects the quality of the print.
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