The traditional gravure printing machine has certain defects in the printing process. If an electrostatic ink absorption device is installed, these defects can be compensated. This article will explain the working characteristics and working principles of electrostatic ink absorber rollers one by one.
1. Working characteristics of traditional plate cylinder and impression cylinder
Because in gravure printing, the ink is stored in the mesh of the printing plate, the printing machine transfers the ink to the printing material by pressure, but in this project, due to the viscosity of the ink and the adhesion of the ink to the printing plate, etc. The reason is that the ink cannot be fully transferred, so it will cause white leakage on the printing material, especially when printing dots, the white leakage phenomenon will be very obvious.
In the gravure printing machine, the dots of the gravure printing machine are easy to be lost, and satisfactory results cannot be obtained. This is a congenital defect of the gravure printing machine. It can be controlled from the aspects of paper, ink viscosity, printing pressure, and tension, but it is difficult to fundamentally solve this problem.
2. Working characteristics of electrostatic ink absorber roller
The electrostatic ink absorption device is installed on the gravure printing machine, and the dot loss can be fully compensated. Whether it is paper gravure or plastic gravure, the safety is very high, the pulsating voltage is more precise, automatic locking, safety protection, the use of integrated circuits is a closed circuit, the machine protection circuit will respond very quickly, cutting off the circuit, Ensure the safety and reliability of the printing press.
Through the paper current monitoring system, the ink absorption of the printing press can be monitored and regulated from this system. It has a very wide paper adaptation, and its adaptation range is 30 ~ 300g of all roll paper. It is widely used in stamps, trademarks, coins, cigarette packs, bonds and other high-quality gravure printing with high color requirements.
3. Working parameters of electrostatic ink absorber roller
Hardness 85 ~ 95; rubber roller hardness tolerance +3, same root hardness difference +1; round runout tolerance ≤0.03m / m; roller surface free of impurities, bubbles, sand holes, mechanical damage, smoothness Ra0.8; insulated conductive anti-voltage. Under no circumstances should the surface of the rubber roller be impacted by external forces or sharp objects, and should be handled with care when transported.
When using thin material to clean the rubber roller, it should be wiped with a towel and cotton yarn and wiped, and it can be used after the appearance is completely dry. Rubber rollers should be stored upright or supporting journals, and should not be squeezed together. Commonly used specifications include two types of roller with shaft and hollow roller.
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