The storage shelf uses solid powder coating instead of liquid solvent coating, which is negatively charged by high voltage and adsorbed on the surface of the grounded coated shelf workpiece by electrostatic attraction, and then heated to melt (or solidify) to obtain the coated film. The powder coating used in electrostatic spraying does not contain liquid components such as solvent and dispersion medium, so it does not need to be diluted or adjusted in viscosity, and cannot move by itself. It can only be moved after melting, and it cannot stick to the surface of the workpiece like a liquid coating. Therefore, electrostatic plastic spraying has the characteristics of high coating efficiency, excellent coating performance, no solvent volatilization, little environmental pollution, low energy consumption, simple process, short consumption cycle, low coating cost and easy completion of coating automation. Electrostatic spraying of powder coatings is called plastic spraying. Its principle is that powder coatings are adsorbed on shelf accessories by corona discharge. The process is as follows: the powder coating is sent to the spray gun from the compressed air gas from the powder supply system, and the high voltage generated by the high-voltage electrostatic generator is applied to the front end of the spray gun, and dense charge is generated near the left side due to corona discharge. When the powder is ejected from the gun nozzle, charged paint particles are formed, which are attracted to the frame column with opposite polarity by electrostatic force. With the increase of spraying powder, the charge accumulation is more. When it reaches a certain thickness, due to electrostatic repulsion, the adsorption will not continue, so that the whole shelf beam and laminate can obtain a powder coating with a certain thickness, and then the powder is melted, leveled and solidified at high temperature, that is, a hard coating film is formed on the outer surface of the shelf accessories.
1. Galvanizing corrodes the filter bag, while plastic spraying does not corrode the filter bag, thus prolonging its service life.
2. The coating has excellent appearance quality, strong adhesion and high mechanical strength.
3. The corrosion resistance, wear resistance and temperature resistance of the coating can be much higher.
4. The structure is very troublesome.
5. Some construction sites have clearly put forward the need to use electrostatic spraying technology.
Electrostatic plastic spraying process:
1. Pretreatment (degreasing, derusting and phosphating).
2. Electrostatic spraying. (The storage rack is made of polyester powder)
3. High temperature curing (generally 180~260 degrees).
4, cooling out of the furnace.