Solution to the uneven printing on the spot during the printing process
In actual printing, we often encounter the phenomenon of uneven printing on the ground. In the past, the printing pressure and paper were first considered. Usually, when the printing pressure cannot be adjusted, the paper can only be changed. This not only increases the printing cost, but also delays the production cycle. . In the following two cases, we have solved this problem by adjusting the printing process.
Example 1: In actual production, we often encounter 30% -50% magenta edition and 100% cyan edition overprinted blue field. Due to poor paper quality, red netting often occurs, and paper with good quality is used instead. The problem was solved, it is clear that paper is the main cause of this failure. But can we solve this problem by adjusting the process? Through analysis, the conventional color sequence of printing is black, cyan, magenta, and yellow. The magenta net is to be overprinted on the cyan solid ground just printed. In order to prevent anti-stripping, the viscosity of magenta ink is reduced, and the viscosity of cyan ink is increased. The problem remains unsolved. Although the effect of using imported ink is better, it is still not ideal. After analysis, because the four-color machine is wet and wet overprinting, when overprinting another color ink on a wet field, the transfer effect is poor, and the ink transfer rate is low. Try to change the printing color sequence of magenta and cyan. Red net, this sample red net can be transferred to paper 100%, the transfer rate is the highest, and more than half of the area of ​​the green plate can also be directly transferred to the paper, so the printed matter is very flat, the problem is obtained After a fundamental solution, even if the paper is of a lower quality, it can be printed.
Example 2: Once, use 150g / m2 offset paper to print the cover of the book, the layout of which has a large area of ​​blue print. When looking for a rule, I used coated paper, which was very flat on the ground, but when I changed to 150g / m2 offset paper, the phenomenon of flowering on the ground was serious, and it was not effective to increase the printing pressure. Obviously, it was caused by the rough surface of the offset paper and poor ink affinity. Because the cyan color is in the second group, the paper has poor ink affinity and is not firmly bound to the ink. The printed cyan ink will be peeled off part of the second group of blankets. Will the single-print green ink be printed on plain clothes? We depressurize the rest of the machine's color groups and print only the cyan color. The printed results are very plain, so we adjusted the printing color sequence and placed the cyan version in the last group to eliminate the printing problems.
Through the troubleshooting of the above two cases, it is found that the printing color sequence has a great influence on the ink transfer, especially the wet and wet overprinting of multi-color printing. It is very necessary to flexibly adjust the printing color sequence according to different jobs.
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