Tension control during gravure printing
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This paper is a brief summary of the tension control in the process of gravure aluminum foil sleeves from three major points.
First, because the roll of the printing press is in the process of winding and unwinding, the diameter of the rewinding and unwinding is constantly changing. When the braking torque is constant, the diameter is reduced, the tension is increased, and the winding is reversed. If the winding torque is constant, the tension will decrease as the winding diameter increases. This is determined by the inherent characteristics of the press and is a major factor in the change in tension of the foil.
Second, the unevenness of the quality of the aluminum foil material affects the change of the tension, such as the fluctuation of the elastic modulus of the material, the thickness of the material varies along the width and the length, the eccentricity of the material roll, and the height of the heating will give the tension of the whole machine. Bring subtle effects.
Third, the printing machine will make the original tension of the whole machine suddenly cause disturbance changes during the process of refueling or receiving materials. The higher the running speed of the equipment, the greater the interference, the large tension change and the poor stability. It should be automatically and randomly adjusted according to the tension of the belt to make the tension return to the original stable state in time. In the overprinting, the printing coil should have a moderate tension when it is conveyed. When the tension is too small, the coil at the inspection site is likely to be shaken, affecting the overprinting precision, and the tension should be constant to ensure the instantaneous linear velocity is constant, and the main motor is required to operate. To be smooth, not fast, slow, and unable to tremble, otherwise it will affect the accuracy of overprinting.