Application Principle Of Tension Control In Gravure Printing Machine

There is a deviation between the manufacturing accuracy and assembly accuracy of the main components of the gravure printing machine, such as the base, wall plate, guide roller, etc., which causes transmission synchronization errors during the printing process, which will inevitably change the tension of each printing unit. During the unwinding process, the diameter of the unwinding and unwinding is constantly changing. The change in diameter must cause the tension of the tape to change. When the unwinding is constant, the diameter decreases and the tension will increase accordingly. .

The tension control must be effective at any running speed of the machine, including the acceleration, deceleration and uniform speed of the machine, and it is also capable of ensuring that the material belt is not damaged at all. The manual tension control system of modern gravure printing machines has been basically eliminated.

Closed loop full-automatic tension control is the actual tension value of the tape measured directly by the tension sensor, and the control signal is calculated by comparing this signal with the tension value preset by the controller. Due to the higher printing speed and higher requirements for tension control in the production process, magnetic powder clutches are no longer capable of performing units of this type of system.

The tension control is stable and the tension change is small. The registration accuracy and scrap rate of the gravure printing machine are easy to control. The tension control system of the gravure printing machine is essentially a special type of input that changes according to some adjustable attenuation law. Dynamic system, fluctuation of material elastic modulus, change of material thickness along width and length, etc., eccentric mass of roll, and changes in production environment temperature and humidity will have subtle effects on the tension fluctuation of the whole machine. Gravure printing machine During the automatic material exchange without stopping, the material receiving and material breaking will make the tension of the whole machine suddenly change suddenly.

Magnetic powder brakes and magnetic powder clutches are widely used in papermaking, printing, plastics, rubber, textile, printing and dyeing, wire and cable, metallurgy, tablet presses and other related winding and processing industries for unwinding and rewinding tension control. Tension control refers to The ability to permanently control the tension of the web as it is conveyed on the equipment.