The tension zone of the gravure printing machine can be divided into three zones: an unwinding tension zone, a printing tension zone, and a slitting tension zone. The unwinding tension zone includes tension control between the web core to the sheet feeding roller in the guiding group; the gravure printing tension zone includes the tension between the sheet feeding roller in the guiding group and the sheeting roller in the printing group Control; from the gravure printing machine printing group paper roll to the slitting tension roller is a slitting tension zone. For an intaglio printing press that does not have a slitting group and only a rewinding group, the slitting tension zone includes an area from the paper force roller to the multiple spool.
The tension control of the unwinding tension zone of the gravure printing press is mainly performed by the uncoiler. Tension control is a main function of the uncoiler, so the control principle of the tension zone is consistent with the working principle of the uncoiler. The clutch, tension roller and tension controller form a closed-loop control system.
The tension control of the tension zone of the gravure printing machine adopts the differential principle, and the system adjusts the tension of the paper by controlling the running speed of the paper feed roller and the paper output roller. At present, the paper feed roller of most gravure printing presses is synchronized with the printing machine running speed, and the paper force roller shaft end is connected with the stepping motor to realize differential control.
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