Introduction and selection principle of static elimination equipment
The static eliminators commonly used in printing plants include induction, high-voltage corona discharge, radioisotope and ion current static eliminators. Among them, the first two are widely used due to their low price, easy installation and use, and absence of atomic radiation. Now we will analyze them as follows.
1) Inductive static eliminator
The inductive static eliminator is the inductive static elimination brush. Its working principle is: when the ** of the eliminator is close to the charged body, it can induce a charge with the opposite polarity to the static on the charged body, and form near the ** A very strong electric field. After the electric field ionizes the air, the generated positive and negative ions move to the charge of the charged body and the dissipator respectively under the action of the electric field, thereby neutralizing the static electricity.
2) High-voltage discharge static eliminator
High-voltage discharge static eliminators can be divided into electronic and high-voltage transformer types according to different structures, and can be divided into unipolar and bipolar according to the difference in discharge polarity. In the printing process, a combination of induction and high-voltage discharge static elimination methods can be used, which can completely and effectively eliminate static electricity.
In addition, when high-voltage corona discharge and ion current static eliminators are used in areas with explosion hazards, explosion-proof static eliminators must be selected according to the hazardous area grade, medium level and group; induction and high-voltage corona The discharge electrode length of the discharge type static eliminator should be 10-15cm longer than the width of the charged body; the type and number of ion nozzles of the ion current static eliminator should be determined according to the installation distance and the width of the charged body; the static eliminator should be based on the level of the object’s electrostatic potential , Static elimination requirements, operating characteristics, explosion hazard zone level, medium level and group selection; the selection principle of the static eliminator installation location: easy to operate, effective in eliminating static electricity, close to the solvent-coated part, and avoid metal objects .