Printing composite bags hue of the control

In the printing process, how to make a batch of printed matter, or several print 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 and there a batch may far from some of the hue. Here's how to control the color on the maximum consistency. 1, ink for 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 the hue is the same, 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 ink, with long red ink will become dark red, not so bright red new ink. The third is the requirement of printing ink viscosity remain consistent from start to finish, it is best to use the controller to control the viscosity. 2, the position of the scraper blade 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 effect on the hue is not big, can change in a certain scope, but also has an effect if the change is too large, especially for shallow anilox printing. 3, the influence of the plate to plate on hue mainly displays in: (1), version. The transfer of ink is reduced, thus affecting hue. So to use household cleanser 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 will change, in general is thin. To solve this problem, if it is printing the batch is larger, and often printing varieties, may dilute some ink in the new, then along with the increase in print runs, gradually reduce the extent of the dilute, until no longer dilute. Hue changes mainly related to the above a few problems, but also has close relationship with proofing, sign the sample. Can not solve the problem of sign sample, color control is insufficient, many printers are printing a sample first, and then let the customer confirm to formal printing effect. When printing sample is critical, it directly affects the can control the color well. Is summed up in one word: printing samples under the normal state of printing, when you can't in pursuit of a certain color printing into the abnormal condition. Normal printing state includes the following aspects: ink viscosity to fit, excessive viscosity against transfer of ink, and prone to paste version, especially black ink, if it is under the conditions of viscosity is larger, the print sample to confirm it is impossible for a long time printing, will paste version, the printing quality scrap. Viscosity too hours very prone to electrostatic phenomenon, but also not conducive to the control of hue. Ink is the best of old and new, mixed. If is to use the printing time is too long, color has change the ink proofing hue is also difficult to maintain consistent. Reason is very simple, because there is no the same ink to add, only new ink added, and the new ink color with hue is little different from the original ink. The position of the scraper contact plate to fit. If the process is in the position of the scraper contact plate and the location of the rubber roller contact plate distance both cases, the official press, where some shallow checker is hard to transfer ink film, tends to take on the printing quality. When trying to remove these flowers shortening the distance between the location point, the hue is bound to change, of course, if the field is printing the basic does not exist the problem. Most hue control is to control multiple color mixing effect, the above is for a color change. In the concrete operation, to accurately determine which one colour is changed so that mixed hue has changed, this 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.