Methods of Eliminating Static Electricity in Book Printing

Methods of Eliminating Static Electricity in Book Printing
1. Chemical Elimination
Apply a layer of antistatic agent on the surface of the substrate to make the substrate conductive and become a slightly conductive insulator. The application of chemical elimination has great limitations in practice. For example, when chemical components are added to printing paper, it will have adverse effects on paper quality, such as reducing paper strength, adhesion, tightness, tensile strength, etc. Therefore, chemical methods do not too widely used.
2. Physical elimination method
It is the most commonly used method to eliminate the static electricity itself without changing the material properties.
(1) The grounding elimination method uses a metal conductor to connect the substance to be eliminated static electricity to the earth, and equipotential with the earth, but this method has no effect on the insulator.
(2) Humidity control elimination method
The surface resistance of the printed material decreases with the increase of air humidity, so increasing the relative humidity of the air can improve the conductivity of the paper surface. The suitable environmental conditions for the printing workshop are: the temperature is about 20 degrees, and the environmental humidity of the charged body is more than 70%.
(3) 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 radioisotope type. Inductive static eliminator rod: the inductive static eliminator brush, the principle is that when the tip of the eliminator is close to the charged body, it induces a charge whose polarity is opposite to that of the static electricity on the charged body, thereby neutralizing the static electricity.