Printing is carried out on the object surface, and the electrostatic phenomenon is mainly reflected on the object surface. The relationship between the two is naturally very close. The printing process includes frequent impact, friction and contact separation, which makes almost all objects involved in the printing process have static electricity. The first is that the surface of the substrate is charged, such as paper, polyethylene, polypropylene, cellophane, etc. they will adsorb paper scraps or a large amount of dust and impurities in the air, so as to affect the transfer of ink, reduce the ink transfer rate, appear "spots" on the printed matter, or cause slippage and uneven winding due to mutual exclusion. Secondly, the ink is charged. If the charged ink discharges at the edge of the line on the print, there may be "ink whiskers" here. In addition, the ink will be fogged due to charging, resulting in serious pollution to the printed matter and the printing environment. When the charged substrate is serious, it may even cause air discharge due to ultra-high potential, resulting in electric shock or fire. Many parts of the high-speed printing machine will generate a lot of static electricity due to the strong friction during high-speed operation. When the old web wheel transfer brush machine with imperfect power dissipation device is running at high speed, the voltage at some positions on the machine is sometimes as high as 15000 V and the current is about 100 UA. The influence of such strong voltage and current on the printing process is complex, The harm is also quite serious, especially the direct threat to the personal safety of operators. When printing, we can use electrostatic eliminators to eliminate it. Generally, the electrostatic eliminators used on the printing press include inductive electrostatic eliminators, high-frequency and high-voltage electrostatic eliminators, power frequency and high-voltage electrostatic eliminators, etc. they should be installed near the drum.
