The magnitude and variation of the tension value required for different processing areas of the flexo printing machine are different, so several tension areas need to be divided on the entire machine. Adjacent tension zones are separated by components that can significantly change the tension value of the printing material. Such components mainly include: unwinding and rewinding shafts equipped with motors, clutches and brake discs, feeding and discharging tension rollers (niproll) Wait. Although the printing plate cylinder has a certain interference to the tension of the printing material in the co-pressed printing state, because the flexographic printing belongs to light contact, it will not significantly change the tension.
A typical unit-type flexo printing machine has 3 tension zones, from the unwinding shaft to the feed tension roller is the unwinding tension zone; from the feed tension roller to the discharge tension roller is the printing tension zone; from the discharge tension roller Between the rewinding shaft and the rewinding tension zone. In special cases, if it is necessary to perform die cutting before the discharge tension roller, an isolation tension roller is added between printing and die cutting to avoid the mutual influence of the front and rear sections.
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