What are some details to pay attention to when spraying shelves? The surface spraying of shelves uses solid powder coating instead of liquid solvent based coating. It relies on high voltage to make the powder coating negatively charged, and uses electrostatic attraction to adsorb onto the grounded surface of the coated workpiece. After heating and melting (or curing), the coating is obtained.
1、 The electrostatic spraying of powder coating is called spray coating. Its principle is to use the phenomenon of corona discharge to make the powder coating adhere to the workpiece.
The process is as follows: the powder coating is fed into the spray gun through a compressed atmosphere gas from the powder supply system, and a high-voltage electrostatic generator is added at the front end of the spray gun to generate a high voltage. Due to corona discharge, a concentrated electric charge is generated near it. When the powder is sprayed from the nozzle, charged coating particles are formed, which are attracted to the workpiece with the opposite polarity by the electrostatic force. As the amount of powder sprayed increases, the accumulation of electric charge also increases. When a certain thickness is reached, the electrostatic repulsion effect is generated, and the entire workpiece does not inherit the adsorption, thus obtaining a certain thickness of powder coating. At the end of the day, high temperatures cause the powder to melt, level, and solidify, forming a strong coating on the surface of the workpiece. Secondly, the advantages of electrostatic spraying on shelves are:
1. The coating has good wear and temperature resistance.
2. The surface quality of the coating is excellent, with strong adhesion and machine strength.
3. Good corrosion resistance and enhanced adaptability to situations, thereby extending the shelf's lifespan. The aesthetic results are significant: the surface is smooth and the refractive index is equal.
Many construction companies have clearly stated that they must use electrostatic spraying technology to deal with penalties.
3、 Punishment before the process of electrostatic spraying on shelves (degreasing, rust removal, phosphating).
Electrostatic spraying. (Our company accepts polyester powder) High temperature curing (usually 180-260 degrees).
Cool out of the oven.