In gravure printing, it is often encountered that when a flexible packaging factory employee reports an abnormal failure, he often simply tells about the abnormal phenomenon, rather than describing the specific details very accurately. For example, lack of ink, the phenomenon of lack of ink is different, the causes are different, and the solution is naturally different. Here we come to understand the specific reasons and solutions for the lack of ink.
1. Ink shortage caused by insufficient ink in the ink tank-This is the most common ink shortage phenomenon. The specific reasons for this phenomenon are: first, the ink pump stops ink for some reason; second, the ink tank slides for some reason, causing the ink level Lower; third, the ink level itself is not high, and the ink level is not high enough due to rapid operation after speeding up production. The solution: First, repair the ink pump to re-ink normally; Second, shake the ink tank and prevent it from sliding down again to make the ink level normal; Third, shake the ink tank to make the ink level match the speed.
2. The lack of ink caused by the dents of the impression cylinder-the specific cause of this phenomenon: first, the magenta impression cylinder has pits; second, the magenta version of the printing plate has bumps. The solution: one is to increase the magenta impression cylinder to solve it, if the fault still exists, you need to replace the impression cylinder; the second is to increase the pressure of the impression cylinder and reduce the speed of production, if the fault still exists, you need to stop and replace Edition.
3. Improper ink level of ink tank causes ink shortage-the reason for this phenomenon: First, the position of the ink tank rises too high during preparation, resulting in ink residues and other deposits at the bottom of the ink tank touching the plate , Scraping part of the graphic; second, the paper blocking on the back side of the scraper is too long, and the height of the ink tank is too high, resulting in curling of the blocking paper. The curled blocking paper intermittently touches the printing plate, scraping part of the graphic . The solution: First, reduce the ink level of the ink tank properly, as long as the printing plate is immersed in the ink 1-37.5px ; Second, stop the machine , and properly shorten the back side of the blade to prevent it from curling.
4. Missing edges of text or patterns-the reasons for this phenomenon: First, the printing plate dots are clogged and not wiped out before starting; Second, the ink or solvent is used improperly; Third, the ink viscosity deviates from the normal value after the increase. The solution: first, wipe the plate with a rag dipped in solvent and decontamination powder before starting the machine. If necessary, wash the plate with a washing solution to ensure that the printing dots are not blocked; second, stop the ink or solvent replacement; third, measure the ink viscosity on time, Make sure that the ink viscosity is at a normal value, and avoid accidental wind flow around the printing press.
5. The lack of ink caused by external water droplets or oil stains-the reason for this phenomenon: first, the water vapor of the humidifier is too large, and occasionally the water droplets leak onto the printing plate; second, the cooling water pipe leaks, which leaks onto the printing plate text; The third is that the cooling water temperature is set too low, resulting in too much condensate and too heavy
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