Tension control refers to the ability to permanently and stably control the tension of a material as it is transported on a device. The tension control of the slitter is basically manual tension control and automatic tension control. Manual tension control means that during the winding or unwinding process, when the winding diameter changes to a certain stage, the operator adjusts the manual power supply device to achieve the purpose of controlling the tension.
The automatic tension control is to directly measure the actual tension value of the material belt by the tension sensor, and then convert the tension data into a tension signal and feed it back to the tension controller. By comparing this signal with the preset tension value of the controller, the control signal is calculated. The control unit is automatically controlled to make the actual tension value equal to the preset tension value for the purpose of stabilizing the tension.
Tension control must remain effective for any speed of the slitter, including acceleration, deceleration, and constant speed of the machine. Even in the case of an emergency stop, there should be a capacity to ensure that the material being cut is not scratched or damaged. The stability of tension control is directly related to the quality of the slitting product. If the tension is insufficient, the raw material will loose or drift during operation, and the finished product will wrinkle after slitting and rewinding; if the tension is too large, the raw material will be easily broken, so that the broken material of the finished product will increase after the slitting and rewinding.
For this reason, constant tension control is required, that is, the raw material is subjected to an optimum tension during the winding process, and the tension is always maintained. Since the selected detection element and torque adjustment element are different, there are various tension control schemes available.
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