Nordson kinetix, Manual

Page: 15 / 76

Description
2-3
Part 334598G03
E
2008 Nordson Corporation
Theory of Operation
See Figure 2-2.
Electrostatic Charge
The gun control unit delivers low-voltage dc power through a cable (8) to the
multiplier (3), which is housed in the spray gun extension (4). The multiplier
generates high voltage (93 kV) that creates an electrostatic field. The
electrostatic field produces a corona discharge around the electrode (1).
The LED voltage indictor (5) lights when the electrostatics are turned on.
The kV on/off switch (6) can turn the electrostatic power off at the spray gun
to reduce the Faraday cage effects.
Resistors within the multiplier limit the output current at safe levels. The
corona around the electrode electrostatically charges the coating material.
As the charged coating material is sprayed it is attracted to the grounded
object to be coated.
Fluid Flow
Fluid enters the spray gun through a fluid supply hose (10) attached to the
extension and flows to the fluid tip (2). The ball tip (14) opens as the
trigger (12) is pulled, allowing fluid to flow to the nozzle. The packing
cartridge (13) prevents fluid from flowing into the spray gun body and
handle (7).
Air Flow
Activation (trigger) air (9) enters the spray gun through an inlet in the
handle. This air triggers an airflow switch in the multiplier, which turns on
the electrostatics. When the air valve is opened, the air passes over a heat
sink to help cool the multiplier before it exits through a muffler in the side of
the spray gun body.
The spray gun includes a trigger lock (11) to prevent accidental triggering of
the spray gun and possible injection injuries.
Airless spray guns can be fitted with a variety of restrictors and nozzles.
Restrictors are pre-atomization devices that do not normally reduce flow, but
aid in atomization and tend to reduce the pattern width. If a restrictor is
used, the nozzle gasket is removed and replaced with a restrictor.