How to solve the defects in the printing process of gravure printing machine
Conventional gravure printing presses have certain defects in the printing process, and these defects can be compensated if an electrostatic ink absorbing device is installed. This article will explain the working characteristics and working principle of the electrostatic ink-absorbing rubber roller.
1, the working characteristics of the traditional plate cylinder and impression cylinder
Since in the gravure printing, the ink is stored in the cell of the printing plate, the printing machine transfers the ink to the printing material by pressure, but in this project, since the ink has viscosity, and the ink has adhesion to the printing plate, etc. The reason is that the ink cannot be fully transferred, so whitening will be formed on the printing material, especially when printing dots, the whitening phenomenon will be very obvious.
The gravure printing machine is easy to lose in the dot printing machine, and can not obtain satisfactory results. This is a congenital defect of the gravure printing machine, which can be controlled from paper, ink viscosity, printing pressure, tension, etc., but it is difficult to fundamentally solve this problem.
2, the working characteristics of the electrostatic ink absorption roller
An electrostatic ink absorbing device is installed on the gravure printing machine to fully compensate for the loss of the dot. Whether it is paper gravure or plastic gravure, it has high safety, more pulsating voltage, automatic locking, safety protection, and the integrated circuit is a closed circuit. The machine protection circuit will react very quickly and cut off the circuit. It ensures 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. With a very wide paper adaptation, it is suitable for all webs from 30 to 300g. It is widely used in fine gravure printing with high color requirements such as stamps, trademarks, coins, cigarette packets and bonds.
3, working parameters of electrostatic ink absorption roller
Hardness 85~95; rubber roller hardness tolerance +3, same root hardness difference +1; round runout tolerance ≤0.03m/m; roll surface without impurities, bubbles, blisters, mechanical damage, smoothness Ra0.8; insulation conductive voltage. Under no circumstances should the outer surface of the rubber roller be subjected to external force or sharp impact, and should be handled with care.
When cleaning the rubber roller with thinner, it should be wiped with a towel and cotton yarn and then wiped. After the surface is completely dry, it can be used. The rubber rollers should be placed upright or supported by the journals and should not be squeezed together. Commonly used specifications are two types of shaft rollers and hollow rollers.
Article source address: http://
Mobile Flipchart Star Base,Aluminum Easel,Professional Flipchart Easel,Mobile And Versatile Magnetic Whiteboard
Dongguan Aoxing Audio Visual Equipment CO.,Ltd , https://www.aoxing-alr.com