How to control the tension of Cigarette Tipping Paper during overprinting?

How to control the tension of Cigarette Tipping Paper during overprinting?

In the overprinting process of Cigarette Tipping Paper, the adjustment and change of tension directly affect overprinting and the accuracy of printing, which is one of the key factors of printing process control. This article focuses on analysis.

　　 As long as the tension control is stable and the tension change is small, the accuracy and scrap rate of the aluminum foil overprinting can be easily controlled. However, in the aluminum foil printing process, there are many factors that cause fluctuations and changes in tension.

　　 1. Because the roll of printing press is in the process of rewinding and unwinding, the diameter of rewinding and unwinding is constantly changing. When the unwinding torque is constant, the diameter decreases and the tension increases, while the winding is the opposite; if the winding torque is constant, the tension will decrease as the winding diameter increases. This is determined by the inherent characteristics of the printing machine, and is also the main factor causing the change in the tension of the aluminum foil.

2. The uneven quality of aluminum foil material affects the change of tension, such as the fluctuation of material elastic modulus, the change of material thickness along the width and length direction, etc., the eccentricity of the quality of the material roll, and the height of heating will all give the tension of the whole machine. Bring subtle effects.

　　 Three, the printing machine will cause the original stable tension of the whole machine to suddenly produce interference changes during the material change or the material receiving and cutting process. The higher the equipment running speed, the greater the interference, the greater the tension change, and the poorer stability. According to the interference of the tension of the material belt, it should be adjusted randomly and automatically so that the tension can be restored to the original stable state in time.

In overprinting, the printed web must be properly tensioned during transmission. If the tension is too small, the web at the inspection site is likely to jitter, which will affect the accuracy of overprinting. The tension must be constant to ensure a constant instantaneous linear speed and require the main motor to run. It must be stable, not fast and slow, and not vibrating, otherwise it will affect the accuracy of overprinting.

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