Below is a problem often encountered roller UV ink in a paper, and I hope to help enterprises printing and roller production enterprises.

　　Problem a: ink, ink scraping knife scraping later will appear in the roller. Printing machine at low speed, not easy to appear; prone to high speed operation of the machine, and the machine speed more obvious, there is no rule to follow.

　　The solution:
　　Add appropriate amount of alcohol ink (less than 5%) will improve;
　　As a result of the use of plastic scraping knife caused, the replacement can be solved;
　　Filter ink, impurities caused by too much;
　　Scraping knife jitter caused by fastening the scraping knife. The material is hard, the size of the narrow scraping knife scraping knife, increasing contact with roller strength, or replacement of scraping knife base or scraping knife pressure spring, can avoid the ink spots.
　　In short, the fastening scraping knife, replace the pressure spring, strengthen the effect will be improved. Usually more than two objects together are fastidious about "adaptive", printability people often mentioned, often say is ink, such as raw materials, but the ink scraping knife and roller close engagement, the relationship between the two is also very important.
　　Question two: plug mesh, paste version; the plate by a large quantity of ink, ink easily into the text, also called block ink.

　　The solution:
　　The replacement roller;
　　Control the ink viscosity;
　　The number of roller line is too low or too high a line number does not match, consider making again;
　　Control of the production environment: when the temperature is higher than 50 ℃, the plate expansion 1 - 3%, the hardness decreases, mesh point of reducing variation. Because the network expansion prone to plug network phenomenon, the higher the temperature is, the more difficult to control.
Question three: pinholes, pits, printing is not real.

　　The solution:
　　Mechanical pinhole, ink and paper surface concave part is not full contact, or the viscosity of ink, ink layer is too thin, the coating. Ensure full access to both, or ink viscosity is moderate, can improve the;
　　Chemical pinhole, ink not fully wet the substrate surface by solving, additive;
　　Seihan, drops not clean, residue in the version of the graphic, the medicine can be washed.
　　Other factors also affect the ink:
　　Plate: plate hardness hardness is generally 60 to 70 degrees, the hardness is too low dot cannot fully restored to its original characteristics.

Printing environment: its influence on the ink, with the increase of environmental temperature, solvent ink ink will appear and degeneration of the volatile, difficult to control; the plate temperature is increased, the plate swelling, soft, easy to deformation, especially in the tearing process problems more obvious. More importantly, dot deformation are serious, more than any other part of the graphics can not control, printing graphics and text hair deficiency, not real resistance rate also dropped.
　　In printing ink for ink and add white, because prevents light rays through and affect the ink drying. The additives can not work, need to replace the new ink can solve the problem. So try not to add too much ink additives, additives can solve some problems encountered in the control of printing, at the same time will not have other problems. Water based ink additives to change soon, same removal soon. UV ink is not the same, to ensure the printing quality at the same time, the best amount of additives.
　　The flexographic ink has limitations, its color, saturation are difficult to achieve at the same time other printing effect. Someone said: "to solve the problem of the ink, flexo printing problem is solved 50%." Some people even said: "as long as the solution to the flexo printing edition and the problem of ink, can be compared with offset printing". In fact, to achieve successful printing operation, to ensure the quality of the prints, the problems should be comprehensive to analyze the printing fault, only in this way can successfully solve the problems.