In the overprinting process of gravure aluminum foil, tension adjustment and changes directly affect the accuracy of overprinting and printing, which is one of the key factors in the control of the printing process. The tension control system of the aluminum foil printing machine is a special follow-up system whose input quantity changes according to some adjustable attenuation law. Tension control is the core of the whole machine control. As long as the tension control is stable and the tension change is small, the precision and scrap rate of aluminum foil in overprinting can be easily controlled. However, during the aluminum foil printing process, the fluctuations and changes in tension are many and require careful analysis.
1. As the material roll of the printing machine is in the process of winding and unwinding, the diameter of the winding and unwinding is constantly changing. In the case of unwinding, when the braking torque is constant, the diameter decreases, and the tension increases accordingly. Rewinding is the opposite. If the winding torque is constant, as the winding diameter increases, the tension will decrease. This is determined by the inherent characteristics of the printing press, and is also the main factor causing the change in the tension of the aluminum foil.
2. The unevenness of the quality of the aluminum foil material affects the change of tension, such as the fluctuation of the elastic modulus of the material, the change of the thickness of the material along the width and length, the eccentricity of the material roll, and the heating level will give the whole machine tension Bring subtle effects.
3. During the process of material changing or material breaking, the printing machine will suddenly cause the original machine's already stabilized tension to suddenly change. The higher the running speed of the equipment, the greater the interference, the large change in tension and the poor stability. It should be automatically adjusted randomly according to the tension interference of the material belt to restore the tension to the original stable state in time. In overprinting, the printing web must be moderately tensioned when it is conveyed. If the tension is too small, the web at the detection location is prone to jitter, affecting the accuracy of the overprinting. The tension must be constant to ensure constant instantaneous linear speed and require the main motor to run It should be stable, not fast and slow, and not vibrate, otherwise it will affect the accuracy of overprinting.
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