The tension control of the unwinding tension zone is mainly done 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 printing tension zone is an important part of the gravure press tension control system and is the key to ensuring the accuracy of printing registration. The tension control of the tension zone 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 machines is synchronized with the running speed of the printing machine, and the paper roller end of the paper is connected with the stepping motor to realize differential control.
The tension control in the slitting tension zone is also important. If the slitting accuracy is not achieved due to the instability of the tension, waste will be produced. For this reason, the tension zone generally adopts the same control method as the printing tension zone. The basic speed is the running speed of the printing group and the paper force roller, and the shaft end of the paper roll of the slitting group is connected with the stepping motor to realize the differential control.