| System Components
An electrostatic powder coating system is comprised of a powder
feeder, power unit or electrostatic voltage generator, electrostatic
spray gun(s), and a powder recovery system.
Feed center
In the feed unit, powder is diffused by compressed air into a fluid-like
state. It is then siphoned out by the movement of high velocity
air flowing through a venturi and propelled through powder feed
tubing to the spray gun.
The feeder provides a controlled flow of powder to the spray guns.
Since powder and air volume are independently controlled, dilution
ratios can be adjusted to obtain the desired thickness coverage
needed to meet specific production requirements. The feeder can
provide sufficient discharge pressure and velocity to feed a gun
as remote as 50 feet away.
Power unit
A high-voltage, low-amperage power unit supplies an electrode at
the front of the gun. As the powder leaves the gun, the electrode
emits a field charge that is imparted to the coating material as
it is propelled toward the part. Once charged, the powder particles
are drawn and attach themselves to the grounded work piece.
The power unit has sufficient voltage to assure maximum wraparound.
Voltage is operator adjustable up to 100 kV to minimize Faraday
Cage effect when spraying into corners and deep recesses, and to
ensure excellent wraparound and surface coverage on all surfaces
being sprayed.
Spray guns
Electrostatic powder guns are designed to shape the spray pattern
and impart an electrostatic charge to the powder. The spray pattern
is easily configured to accommodate the type of coating used and
the shape of the part being coated.
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