As we all know, the change in the viscosity of the printing ink has a direct influence on the amount of ink on the printing plate, so if the viscosity of the ink changes, it will affect the printing quality. Therefore, it is generally necessary to monitor the viscosity of the ink during the printing process, which is particularly important in gravure printing, because the gravure printing uses a low-viscosity solvent-based ink, the solvent evaporates quickly, and the viscosity is liable to change. However, flexographic printing and gravure printing are quite different. When discussing the composition of water-based inks, "amine" has been mentioned. It is a solubilizing resin that determines the pH of water-based inks. Usually, the pH of water-based inks should be in the range of 8.8 to 9.5. At this time, the printing performance of water-based inks is the best, and the quality of printed products is the most stable. Since the amine is constantly volatilized during the printing process, the operator will occasionally add new ink and various additives to the ink, and the pH of the ink may change at any time. When the pH value is higher than 9.5, the alkalinity is too strong, the viscosity of the water-based ink is lowered, the drying speed is slow, and the water resistance is deteriorated; when the pH is lower than 8.8, the viscosity of the water-based ink is too low. When it is raised, the ink is easy to dry, blocked on the plate and the anilox roller, causing stain on the plate surface and foaming. This article will introduce you to the printing machine squeegee in Panyu District.
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.
The scraper wear is more serious. When sandpaper or oilstone cannot be used for grinding, it can be repaired by a special sharpening machine, which can be reused several times, which greatly reduces the cost of the doctor blade. One problem is related to the scraper, and many people misunderstand it as ink. This refers to dozens of irregular line marks that sometimes appear irregular. It looks like ink is piled up. It is different from the scraper line. It is not continuous, but sometimes it is not, or the printing port is only in the river. 1/2 or 1/3 appears, which is actually caused by the pressure of the scraper is too small or the scraper is not sharp enough.
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