The importance of tension control for flexo printing machine

We all know that there are many factors that affect the printing quality of flexo printing machines, such as ink design before printing, color separation, plate making, and selection of water-based ink; die-cutting, cross-cutting, bronzing after printing; printing tension control, mesh Pattern roller selection, printing pressure adjustment, etc.

For the unit-type flexo printing machine, the most important thing is the tension control, because the flexo printing machine is a rotary machine that uses continuous paper feeding and continuous printing die cutting. Once the tension is unstable, the overprint deviation is large and the flexo is wasted. Printing materials range from a few dozen meters to dozens of meters, which not only affects the quality, but also increases the scrap rate.

If the quality of the printing material is set aside, the accuracy of overprinting on the flexo printing machine depends on whether the operator has selected the appropriate tension value. It then depends on whether the printing press can accurately maintain a constant tension value during the printing process, thereby controlling the overprint error within a certain range, such as ± 0.005 inches. When the paper speed of the machine changes, the change of the tension value should be controlled to the minimum to ensure the minimum offset of the overprint.

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