Two, spraying construction process of the main equipment and performance
The electrostatic
powder coating is a powder coating under the effect of compressed air atomization was fine
and uniform, uniformly adsorbed on the metal surface of the workpiece with high voltage
electric field, a kind of advanced coating technology for high temperature curing film. By
the French Sames company in 1962 the first successful development, in 1965 with the
British, France, Germany, the United States, Japan and other countries have launched a
complete set of electrostatic powder spraying equipment, in industrial production has
reached a wide range of applications.
Electrostatic powder spraying coating is a
postprocessing, must carry out strict pretreatment on the workpiece (degreasing, rust,
phosphating) after, no oil, no rust, no surface dust, no dust hanging phenomenon, and
definitely not a high temperature (180 - 200 c) easy decomposition product in. As far as
possible the use of sand or zinc phosphating (iron phosphating effect is very poor), are
not allowed to rust removal, such as nitrite passivation antirust directly namely
electrostatic powder coating, coating adhesion is not good and easy to cause a large area
off phenomenon, which in many factories had painful lessons.
The main equipment required for
electrostatic powder spraying is:
The host (including high pressure generator, spray gun,
powder supply bucket, a set of control system);
The spray room
The recovery device
The
transport system (including conveyor chain and truck etc.)
The curing device (with automatic
temperature control device and ventilation device)
Such as air compressor (including the
oil-water separation system).