Web guide control refers to the technical operation for the coil materials and must always keep the edge of the coils neat and consistent during the spraying, printing, punching, laminating, slitting or other coil winding processes. Once the edges of the coils are not aligned, it will cause errors in subsequent steps, resulting in material waste. Therefore, when processing coils, it is necessary to do the correct deviations in time for the offset coils. The whole process is called web guiding
. The equipment, which is used for the whole process, constitutes a set of web guide system. A typical system includes a controller, a sensor, a guide mechanism and a driver.