The operation status of the tension control system is directly related to the quality of the gravure product. Once the tension is abnormal, it will affect the yield and cause a certain amount of material waste. This article summarizes several common tension problems and their solutions in gravure production, and is willing to share and communicate with people in the industry. Question 1: How can it be easier to establish a stable initial tension? 1. phenomenon 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. 2. analysis The change of the roll diameter will cause the change of its inertia, but before the gravure printing machine establishes the initial tension of the machine, the position of the swing roller has not changed, that is, the amount of tension deviation collected by the tension controller has not changed. The output of the tension controller has not changed. However, for rolls of different diameters, the motor has the same angular velocity, so the larger the diameter of the roll, the faster the surface linear speed, the faster the speed, the more difficult the motor is to control, so there will be different diameters The difficulty of the material roll and the gravure printing machine to establish a stable initial tension is different. 3. 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 of them does not differ much. 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. Question 2: How to achieve a smooth transition of tension during automatic roll change cutting? Automatic roll changing and cutting, that is, the double-station shaft can realize the automatic switching of new and old material rolls under the action of the tension controller. The specific process is as follows: First, press the ready feed button, the gravure machine turret will rotate counterclockwise, and the new device roll is controlled to stop at the predetermined position through the detection device, and the potentiometer detects the approximate volume of the new material roll. Diameter, and drive the new material roll to rotate at a certain surface linear speed, so that it is basically the same as the surface linear speed of the old material roll; secondly, press the material receiving button, the cutting device completes the pasting of the new and old material roll through the corresponding action Automatic cutting; finally, the old material roll is reduced from the current speed to zero speed to complete the cutting. Automatic roll change cutting can not only improve work efficiency, but also reduce the workload and work intensity of the operator. 1. phenomenon 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. 2. analysis In the process of automatic roll change cutting, the new material roll and the old material roll can achieve a smooth transition of tension only at the same surface linear speed. This requires the potentiometer to accurately detect the diameter of the new material roll to ensure the new material roll. The surface linear speed of the old material roll is as same as possible, which provides the prerequisite for automatic cutting. Of course, it is only an ideal situation that the surface linear speed of the new and old material rolls are completely consistent. In fact, there is still a certain speed difference between the two. In general, after the automatic roll change and cutting are completed, the tension of the new material roll will still appear slight Changes, but will not affect the quality of the final product. 3. 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. Constant tension control is the guarantee of product quality. When there is a problem with tension control, as long as you observe carefully and analyze carefully, you can certainly find the corresponding solution. Stainless Steel Insulated Barrels Stainless Steel Insulated Barrels,Stainless Steel Thermos Food Containers,Stainless Steel Drum With Lid,Stainless Steel Drum Jiangmen Junerte Stainless Steel Kitchenware Co.,Ltd , https://www.junertejm.com