The tension control system of the gravure printing machine realizes the tension detection through the swing roller. A tension detection potentiometer is installed at the end of the swing roller. When the tension changes, the detection value of the tension detection potentiometer will also change. The tension controller will obtain the deviation, and adjust the speed of the corresponding motor through the PID controller to keep the material roll tension stable. 1. Problems and solutions caused by unstable tension in the process of automatic roll change The automatic roll changing and cutting process is carried out during the high-speed operation of the gravure printing machine. Therefore, there are many factors that are affected during the automatic replacement of the new and old material rolls, which is likely to cause abnormal vibration of the swing roller. No smooth transition of tension can be achieved. Once this problem occurs, it takes a long time to adjust to return to normal, resulting in double waste of materials and time. Solution: In order to ensure the accurate detection of the diameter of the new material roll, the potentiometer can be replaced with a more accurate encoder. After the roll change is completed, due to a certain change in the state of the roll, it will cause some interference to the diameter detection, so the roll should be stabilized before testing. The proportion unit and integral unit of the material roll should be more refined. When the diameter of the material roll changes, the adjustment amount of the tension controller also changes accordingly, so that the tension fluctuation is smaller. 2. Problems and solutions caused by unstable initial tension In actual gravure production, the roll diameter and width of different printing substrates will be different. When the unwinding unit installs a roll with a smaller diameter, the gravure printing machine can smoothly establish the initial tension of the whole machine, but If the roll with a larger diameter is replaced, the swing roll of the gravure printing machine will frequently vibrate, and it will not be stable for a long time. In severe cases, the roll will be deformed or even broken. This situation will not only cause a serious waste of materials, but also increase the workload of the operator, causing many unnecessary troubles for the printing enterprise. Solution: For the rolls of different diameters, by setting different proportional unit and integral unit to the PID controller, when the initial tension of the rolls of different diameters is established, the surface linear velocity is not much different. Specifically: set a larger proportional unit and integral unit for the roll with a smaller diameter, so that it does not affect the speed of the motor when the initial tension is established, and it can establish a stable initial tension; for a larger diameter The material roll is set with a smaller proportional unit and an integral unit, so that the running speed of the motor becomes slower, so that a stable initial tension can be established. Hair Treatment DELIN HAIR COSMETICS , https://www.hairstylingwaxfactory.com