detailes while use powder coating

Powder coating is a kind of solid powder state, and powder coating, and then heating the 

melt flow flat or curing film coating. The VOC content of the paint is low, clear easy, the 

paint can be recycled to use the construction after the film basically does not produce 

pinhole, usually easier than the liquid coating construction, the formation of the film 

durability is good. The coating is in the sixties of the 20th century began to develop a 

coating of new varieties and new technology, with saving energy and resources, reducing 

environmental pollution, simple process, easy to realize automation, coating sturdiness and 

durability, and pollution-free, high labor and production efficiency, powder can be 

recycled and other characteristics.

The so-called powder electrostatic spraying is the use of high voltage electrostatic corona electric field principle. The high voltage negative electrode is connected to the metal flow guide mark on the spray gun head, and the cathode is formed by the spraying work piece, so that a strong electrostatic field is formed between the spray gun and the workpiece. When used as a carrier gas compressed air, powder coating powder barrels from the donor, the powder tube gun and sent to the guide rod, due to corona discharge generated by the guide rod is connected with the high voltage anode, in the vicinity of the produced intensive negative charge, powder with a negative charge, and entered into the electric field strength of high electrostatic field. In the dual role of 

static electricity and carrier gas powder uniformly toward the ground workpiece surface, 

the formation of a uniform thickness of powder layer and heating and solidifying into 

durable coating.

Improve the charged capacity of powder particles, powder coating on the powder rate will increase. Electrostatic spraying is the main adsorption force of electrostatic force, the rate of powder powder depends mainly on the number of charged particles. The charged amount of powder is proportional to the square of the particle size of the powder. Increase the particle size, increase the amount of charged powder, the powder rate increased. But the powder particle size should not be too big, the particle size is too large, large granular powder of gravity over air dynamic and static electricity, the coating in flight process, due to the gravity effect did not reach the surface of the workpiece have already fallen. On the contrary, powder rate is reduced. 

Powder is too fine charged to reduce the efficiency of coating construction will fall, 

ultra-fine powder (particle diameter <10 m) is basically not charged, while the powder is 

too fine to increase the difficulty of the production of powder.