The principle of physical elimination of static electricity
From the physical elimination method, that is, the method of eliminating the inherent characteristics of static electricity without changing the properties of the material, it is the most frequently used method in the existing process.
(1) The "grounding" elimination method, which is the simplest method, is to use a metal conductor to connect the substance that is to eliminate static electricity to the ground, making it equal to the ground, and the charge does not leak through the ground, but this method is for insulators Almost no effect.
(2) Humidity control elimination method The surface resistance of printed materials decreases with the increase of the relative humidity of the air. Therefore, adding a humidifier to increase the relative humidity of the air can increase the conductivity of the paper surface and accelerate charge leakage. The suitable environmental conditions for the printing workshop are: the temperature is about 20 degrees, and the ambient humidity around the charged object is increased to more than 70%, as an electrostatic safety measure.
(3) Introduction and selection principle of static elimination equipment The static elimination equipment commonly used in printing plants includes induction type, high voltage corona discharge type, ion current static eliminator and radioactive isotope type. Among them, the first two are widely used due to their low price, easy installation and use, and absence of atomic radiation. The analysis is as follows: Inductive static eliminator rod: the inductive static elimination brush, the principle is: when the tip of the eliminator is close to the charged body, the tip can induce a charge with the opposite polarity to the electrostatic polarity on the charged body, and Move at the tip, thereby neutralizing static electricity. The use of this method is gradually decreasing.