Effects of composite packaging color printing sample point, a hand!

In the printing process, how to make a batch of printing composite bags or several composite bags maintain the same hue is the most basic request, is also an important problem. The same hue is only relative and absolute hue consensus is impossible, especially the number of printing, this batch of a batch of color deviation may occur. How to realize the consistency of color involves multiple factors such as ink, scraper, plate. Through the requirement is to achieve consistent color ink color without deviation, first of all, it is best to use the same batch of ink. Because different batch of ink, although some little hue has changed, but some have change, this needs to be good close to the raw material supply. Ink color consistent is the most basic request, is also important, if the ink color deviation is too large, it is difficult to through other ways to control hue is consistent, when a few color to fold together or ink layer thick, color difference is very obvious. Second request every time added to the ink plates of ink quantity is less, often to keep adding new ink, especially some less ink pattern, if an add too much ink, ink for a long time without the use of new ink added its hue will change. Such as with long black ink with gray, no new ink so pure, with long red ink will become dark red, not so bright red new ink. The third requirement ink viscosity remain consistent from start to finish, it is best to use the controller to control the viscosity. By the position of the scraper blade to achieve consistent color contact plate color especially shallow checkered hue has a great influence, so the requirement from beginning to end scraper basically in the same place. Scraper pressure change is too big, can affect shallow network printing color. By plate plate to achieve consistent color hue influence mainly displays in: 1, the wall version: the transfer of ink is reduced, thus affecting hue. So want to use to clean plate, printing in the normal condition. 2, wear plate: when the number of printing plate is large, with the increase of wear degree, its color can change, in general is thin. To solve this problem, if it is printing the batch is bigger, and in printing varieties, can in the new ink dilute some, then along with the increase in print runs, gradually reduce the extent of the dilute, until no longer dilute. Most hue control is to control the mixing effect of multiple colors. In the concrete operation, to accurately determine which one colour is changed to mix the color changed, it is the premise, if it is a judgment is impossible to put the color in the right direction, right after the combination of the above to operation, the hue of control are likely to get satisfactory degree.