With the continuous development of printing technology, the flexographic printing line is no longer limited to a single printing method, and has begun to transform into a diversified processing method that combines various printing processes and post-press processing. There are many successful cases in which a variety of processing methods such as gravure printing, screen printing, cold stamping, embossing, die cutting, etc. are added to a flexo printing machine.
Since the printing pressure of the gravure printing unit is much larger than that of the flexographic printing unit, when the two printing methods are used on the same equipment, there will be a problem that the printing tension of the flexographic printing unit does not match the printing tension of the gravure printing unit, resulting in gravure printing. Color registration and flexo color set overprinting or overprint fluctuations occur frequently. If the circumferential registration of the gravure printing unit is adjusted, the registration deviation of the flexo printing unit will be more serious.
Therefore, how to control the printing pressure to maintain the stability of the printing process overprinting, and reduce the impact of the gravure circumferential registration adjustment on the flexographic printing unit is an important problem to be solved. After continuous exploration, research and practice, the author believes that it can be controlled from the following aspects.
(1) Reasonable arrangement of idle units
If there are idle units, they should be arranged as close as possible to the front and rear of the gravure printing unit.
(2) reduce the printing pressure of the gravure printing unit
The printing pressure of the gravure printing unit should be minimized to reduce the influence on the printing tension of the flexo printing unit.
(3) Scientific arrangement of printing color sequence
Scientific and reasonable arrangement of the printing color sequence. Production practice found that the closer the color group is to the gravure printing unit, the greater the influence of the gravure printing unit on its registration. Therefore, when arranging the printing color sequence, try to arrange the color with low registration requirement before and after approaching the gravure printing unit. Location, the registration requires high color away from the gravure printing unit.
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