When encountering the inconsistency of the ink color of the printed product, the flat screen printer operator should timely to adjust the pressure in the water fountain roller, the pressure of the water roller and the printing plate, the pressure of the ink roller and the printing plate, and the pressure at both ends of the inking roller. During the printing process, the operator of the flat screen printer should pay attention to the "three levels", that is, the ink roller is flat, the water roller is flat, and the cylinder is flat. Only when the pressure of the water and ink rollers are within the normal range, can the ink color of the printed product be consistent.
Flat screen printer operators need to be familiar with pre-press professional knowledge, understand gray balance, color management and other technologies, which are more conducive to printing operations; be familiar with the basic composition and performance of paper, ink, fountain solution, printing plate, blanket, and other raw and auxiliary materials As well as the law of change during the printing process, measures can be taken before printing to avoid related failures.
The operator of flat screen printer must master the skill of ink and wash balance. When printing each job with the pre-adjusted ink, the amount of water should be reduced first. After printing on the plate paper, when the printing speed is gradually increased because the alcohol in the fountain solution evaporates quickly, it is easy to produce floating dirt at the mouth. The head of the printing press should check the printed products frequently and observe the middle and both sides of the paper at the gripper. If there is scumming, increase the amount of water until the scumming disappears. When increasing the amount of water, increase the amount of ink until the ink is balanced. This is because if you only increase the amount of water without adding the ink, the ink will be diluted, resulting in the color of the printed product diminishing, and the ink color will not be consistent before and after.
The operator of flat screen printer should learn to observe the signal bar. During the printing process, the flat screen printer operating technician must always pay attention to the changes of the signal bar to ensure that the field density on the signal bar is within the standard range, the gray balance is not color cast, and 80% of the dots are not smeared. It is a qualified sample.