Gravure printing gravure press tension control method and principle

1. Division of tension zone

The tension area of ​​the gravure press can be divided into 3 zones: the unwinding tension zone, the printing tension zone, and the slitting tension zone.

The unwinding tension zone includes the tension control between the roll paper mandrel and the feeding roller in the guide group;

The printing tension zone includes the tension control between the paper feeding force roller in the guide group and the paper force roller in the printing group;

The slitting tension zone is between the paper roll and the slitting tension roller. For gravure printers without a slitting group and only a rewinding group, the slitting tension zone includes the area from the paper roll to the rewind.

2 tension zone control principle

The tension control of the unwinding tension zone is mainly done by the uncoiler. Tension control is a main function of the unwinding machine, so the control principle of the tension zone is the same as the working principle of the unwinding machine, and a closed-loop control system is composed of a clutch, a tension roller and a tension controller.

The printing tension zone is an important part of the tension control system of the gravure printing machine, and it is the key to ensure 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 feeding roller and the paper roller. At present, most of the gravure printing press rolls are synchronized with the running speed of the printing press. The paper roll end is connected with the stepping motor to achieve differential speed control.

The tension control in the slitting tension zone is also very important. If the slitting accuracy is not achieved due to the unstable tension, the waste will be rejected. 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 roll. The shaft end of the paper roll of the slitting group is connected with the stepping motor to realize the differential speed control.