1. Material properties include internal chemical composition, internal structure, mechanical properties of stress and strain, material shape and conductivity.
2. The ambient conditions include the composition, pressure, temperature and humidity of the gas around the contact object (material).
3. The mechanical action includes the nature of contact type, contact time, contact area, separation speed and material force. Generally speaking, the closer the two materials contact or the faster the separation speed, the greater the static electricity generated.
4. Friction between different kinds of substances will produce static electricity with different polarities. Different materials have different electrostatic strengths.
2. The harm of static electricity to the material surface:
1 First, the surface of the substrate is charged, such as paper, polyethylene, polypropylene and cellophane. They will absorb scraps of paper or float a lot of dust and impurities in the air, thus affecting the transfer of ink and causing flowers on printed matter. , resulting in poor quality of printed matter, poor adhesion and no wear resistance.
3. The method of eliminating static electricity:
The electrostatic elimination equipment commonly used in printing houses includes induction type, high-voltage corona discharge type,
Inductive electrostatic eliminator stick: that is, inductive electrostatic eliminator brush. When the tip of the eliminator is close to the charged body, it can induce charges with the opposite polarity to the charged body at the tip and move at the tip, thus neutralizing static electricity. The use of this method is gradually decreasing.
High-voltage discharge electrostatic eliminator: it can be divided into electronic type and high-voltage transformer type according to structure, and unipolar type and bipolar type according to discharge polarity. Monopolar electrostatic eliminator only works on one kind of charge, and bipolar electrostatic eliminator can eliminate any kind of charge. In addition, in the printing process, the combination of electrostatic brush and high voltage discharge can completely and effectively eliminate static electricity.
4. Choice of ink
Osaka brand ink in Japan has excellent scratch resistance, acid and alkali resistance, heat resistance and light resistance, and is suitable for commercial label machines and offset presses. Ink is dried by oxidizing conjunctiva, and printing on this material does not require ultraviolet or infrared rays. You can visit this website. Dongguan xinsheng printing material co., ltd