After printing and coating, aluminum foil paper and cash register paper need to be post-printed and slit on a slitting machine to cut large rolls of semi-finished products into the required specifications. The semi-finished products that run on the slitting machine are an unwinding and rewinding. This process includes two parts: machine speed control and tension control.
The so-called tension is to pull the aluminum foil and roll it to the core according to the standard. A certain stretch and tension traction must be applied to the aluminum foil. The tension control force of the tensioning aluminum foil is the tension. Tension control refers to the ability to permanently control the tension of the aluminum foil when it is conveyed on the equipment. This control must be effective for any operating speed of the machine, including machine acceleration, deceleration and uniform speed. Even in the case of an emergency stop, it has the ability to ensure that the aluminum foil is not damaged at all. The tension control of the slitter is basically manual tension control and automatic tension control. Manual tension control means that when the roll diameter changes to a certain stage during the winding or unwinding process, the operator adjusts the manual power supply device to achieve the purpose of tension control. Full-automatic tension control is to directly measure the actual tension value of the tape by the tension sensor, and then convert the tension data into a tension signal and feed it back to the tension controller. This signal is compared with the tension value preset by the controller to calculate the control signal. The automatic control execution unit makes the actual tension value equal to the preset tension value to achieve the purpose of stabilizing the tension. The winding and unwinding tension setting of the equipment directly affects the yield of the product. If the tension is too high, the winding is too tight, the aluminum foil is prone to wrinkles, and the tension is insufficient. The aluminum foil is likely to slip on the roll and cause serious misalignment. Unloading, and causing the unwinding shaft to swing greatly during slitting, which affects the quality of slitting, so the slitting machine must have a good tension detection system.
1. Slitting machine unwinding tension detection system:
Tension sensor detection is a direct detection of tension, which is closely combined with machinery and is equipped with a detection method for moving parts. Usually two sensors are used in pairs, and they are installed on the end shafts on both sides of the detection guide roller. The belt detects the applied load on both sides of the guide roller to cause displacement or deformation of the sensitive element of the tension sensor, so as to detect the actual tension value, and convert this tension data into a tension signal and feed it back to the tension controller.
2. Attenuation and tension compensation of the winding and unwinding tension of the slitting machine:
It is generally believed that maintaining a constant tension of the aluminum foil during winding and unwinding is beneficial to the quality of the finished aluminum foil, but this is not the case. The best method is to increase the tension of the aluminum foil according to a certain rule as the diameter or weight of the roll increases, and the smaller the diameter and weight, the tension value will also decrease. Because there are automatic tension control and manual tension control in the slitting operation. Manual tension control requires the operator to continuously adjust the diameter and weight of the master roll.