In the actual printing of large background color picture album, we often encounter the phenomenon of false printing. To solve this kind of problem, we need to have some experience in this aspect. Xiaobian summed up some solutions in the printing process of large background color brochures. Let's talk about the solutions to this problem in detail.
First of all, we will consider the problems of printing pressure and paper. We always think that the pressure is too low and the paper is not good. Usually when the problem can not be solved by adjusting the printing pressure, we can only change the paper, but this will not only increase the cost, but also delay the time. Now we can solve this problem by adjusting the printing process.
In the actual production, we often encounter 30% - 50% of the red version and 100% of the blue version of the overprint blue field, because the paper is not good, often appear red net hair, and change to paper good paper problem will be solved, obviously this is the reason for the paper. But this problem can also be solved by adjusting the process.
After analysis, due to the four-color machine is wet overprint, in wet field overprint another color ink, the transfer effect is poor, ink transfer rate is low, try to magenta and cyan printing color order exchange, first print magenta screen, so magenta screen can be 100% to paper transfer, transfer rate is very high, and green version of the field has more than half of the area can also be directly transferred on paper, this is very important The printed products produced by the sample printing are really flat, and the problem has been fundamentally solved. Even if the paper with poor quality is used, it can be printed.
Offset paper printing album cover, the layout has a large area of blue field. Printed on coated paper, the effect is very good, and offset paper when the phenomenon is more serious. Due to the blue in the second group, the ink affinity of the paper is relatively poor, and the ink is not firmly combined, the blue ink on the latter two groups of blanket will be peeled off. So we adjusted the printing color sequence, put the blue plate in the latter group, and the printing problem was eliminated.
Through the above two troubleshooting, it is found that the printing color sequence has a great impact on ink transfer, especially for multi-color printing wet overprint. It is necessary to adjust the printing color sequence flexibly according to different live parts.