We all know that there are many factors influencing the printing quality of flexographic printers, such as prepress ink design, color separation, plate making, and selection of water-based ink; post-printing die cutting, cross cutting, and bronzing; printing tension control, web Roller selection, printing pressure adjustment and so on.

For the unit type flexo press, the most important is the tension control, because the flexo press is a kind of rotary press. It adopts continuous feeding and continuous printing and die cutting. Once the tension is unstable, the overprint deviation is large and the waste is soft. At least a dozen meters or as many as several dozen meters of printed materials not only affect the quality but also increase the rejection rate.

If you leave the quality of printing materials aside, the accuracy of overprinting the flexographic printing press depends first and foremost on whether the operator has chosen the right tension value. Then depending on whether the press can maintain a constant tension value during the printing process, the overlay error is controlled within a certain range, such as ± 0.005 inches. When the machine's paper-feeding speed changes, the tension value should be controlled to a minimum to ensure that the overprinting offset is at a minimum.

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