18
6.1 OVERVIEW
In electrostatic spraying, a negative charge is introduced into the fluid in the manifold body via a central charging elec-
trode. This causes the liquid to become negatively charged, which will then cause the fluid molecules to repel each
other.
At the manifold orifice, the fluid forms into a tiny cone. A single stream of droplets will be propelled away from the
orifice due to their negative, repelling charge. The droplets will continue to repel each other as they descend, causing
the small droplets to break up into even smaller droplets. This will continue until the repulsive force between the mol-
ecules is no longer strong enough to break the surface tension and split the droplet.
Yet, these tiny and uniformly sized droplets still retain their negative charge. These fluid molecules will be attracted to
any neutral and grounded target nearby through an attractive force stronger than gravity. This electrostatic force pulls
the liquid molecules evenly towards the target, coating the surface and providing a very high transfer efficiency.
SPECIFICATIONS:
•
Width–
6”, 12”
or
24”
modular sections
•
Orifice Size–
0.020” (0.51
mm) or
0.030” (0.79
mm)
•
Flow Rate (per manifold)
-
0.1
-
20 cc/min per manifold
•
System Sizes–
6”, 12” 18”, 24”, 30”, 36”,
custom sizes available (combined width, all manifolds)
6.2 MOUNTING
ADJUSTABILITY
The mounting location should allow the operator to be able to view the Electrostatic Manifold while at the control panel. This will
allow for easier adjustments and fine tuning of the electrostatic spray, as the operator will be able to easily see the result of
changing system parameters.
When positioning the fluid delivery cart, be aware of its distance from the system control panel mounting location—there is a 7
-
meter maximum cable run. The fluid delivery cart is equipped with caster wheels for easy positional adjustments if needed.
The ES2500 Manifold has been designed to have a high degree of adjustability and can be configured as needed. The
user can control the following:
•
The applied voltage
•
Fluid flow rate
•
The intensity of the electrostatic field
•
The height of the Manifold from the target
•
Rotation of the Manifold around its axis for 360
-
degree coverage
The end mount blocks are pre
-
drilled with a set of 1/4
-
20 UNC threaded and
0.266”
dia. through holes. These can be
used all together, or in part, to mount the assembly from the top, sides, front, and back.
The more degrees of movement that are built into the mounting scheme, the easier it will be to adjust the spray width
and achieve even fluid flow. The nozzle assembly should be able to slide vertically from between
3”
to
14”
from target
and should be able to rotate from 0 to 90 degrees to the target.
ATTENTION
:
Nothing metallic or conductive, with exception to the target, should be within an
18”
envelope of the nozzle. This includes mounting fixtures, which should be made of plastic whenever
possible.
SECTION 6
MANIFOLD
