What
is Static?
Material
such as paper, plastic and textiles normally contain an equal
number of positive and negative charges – that is, they
are electrically balanced. Friction can disturb this balance,
causing the material to become electrically charged.
The electrical charge (static) will exert a force on nearby
charged objects or a grounded conductor. Among the problems
caused by this force are:
- Dust
clinging to product
- Product
clinging to itself, rollers, machine beds or frames
- Materials
tearing, jamming or curling
- Sheet
feeding problems
- Hazardous
sparks or shocks
Charged
conductors (like metals) discharge completely when grounded.
Insulators (like plastics) don't conduct electricity and can't
discharge when grounded. Grounded brushes or tinsel
often have little effect on these surfaces.
When
aiming EXAIR's Model 7905 Static Meter at a single plastic
surface, it is common to measure many voltages across the
same surface. The higher the voltage measured, the stronger
the static charge or force at that point. It is also
possible for some voltages to have opposite polarities (positive
or negative) which determines if two insulators will attract
or repel one another.
EXAIR's
static eliminators (called ionizers) can eliminate the charge.
These shockless ionizers are electrically powered and produce
a bulk of positive and negative ions.
The charged surface attracts the appropriate number of positive
or negative ions from the ionizer to become neutral (discharge).
Selecting
The Right Static Eliminator
EXAIR offers
systems for total static control. When static is a problem on
moving webs, sheet stock, three dimensional parts, extrusions
or packaging, EXAIR has a solution.
Static
Eliminators With Air
|
| A
Model 111118 18" (46cm) Super Ion Air
Knife prevents jamming on a stacker.
|
Combining
our engineered airflow products with ionizers gives us the
ability to eliminate the charge quickly and at great distances.
Laminar flow airstreams produced make it possible to blow
away any contaminants and the charge that attracts them. They
are ideal for:
-
Hard
to reach places or obstructed surfaces
-
Product
moving at high speeds
-
Surfaces
with an extremely high charge
Compressed
air consumption and noise are minimized while providing force
that can be adjusted from a "blast" to a "breeze".
Tests show these ionizers positioned two feet (61cm) away
from a charged surface to be as effective as an Ionizing Bar
without air delivery positioned one-half inch (13mm) from
the surface.
The
Super
Ion Air Knife provides the best performance of all
ionizers. It uses our Super Air Knife (40:1 air amplification)
to deliver a uniform sheet of ionized air effective up to
20 feet (6.1m) away.
The
Standard
Ion Air Knife uses our Standard Air Knife (30:1 air
amplification) to deliver a sheet of ionized air to the surface.
Air consumption and noise are somewhat higher than the Super
Ion Air Knife.
The
Ion Air
Cannon uses our Super Air Amplifier (22:1 air amplification)
to provide a focused, conical airstream that is capable of
removing the charge up to 15 feet (4.6m) away.
The
Ion Air Gun
uses our High Velocity Air Jet (5:1 air amplification) to
provide a narrow beam of ionized airflow. This hand-held static
eliminator is rugged for industrial use and has incredibly
fast static decay rates.
The
Ion Air Jet
is a mountable version of the Ion Air Gun (without blowgun).
This ionizer is the ideal way to focus an ionized airflow
at confined areas.
|
| A
Model 7006 6" Ionizing Bar eliminates the static
charge that causes packing peanuts to cling. |
Static
Eliminators Without Air
In
some situations, even the smallest amount of airflow can disturb
the product. This is especially true for lightweight materials.
EXAIR manufactures two styles of ionizer for these critical
applications.
Ionizing
Bars are
ideal for relatively flat materials, where the bar can be
mounted within a few inches of the product surface.
The
new Ionizing
Point is
effective for spot neutralization. The compact size makes
it ideal for winding or slitting operations. It can also be
mounted through a duct to neutralize static charges due to
moving air or materials.
|
|
This
special ionizer dries water based paint on car bodies
and eliminates any static problems.
|
Special
Static Eliminators
EXAIR
manufactures static eliminators suited to specific application
requirements. The special ionizer ( shown
bottom right)
was developed for the automotive industry. This air amplifier
and ionizer combination is used to dry water based paints
on car bodies while eliminating the possibility of a static
charge that might attract dust or other contaminants.
If
you have special requirements, please contact an Application
Engineer to discuss the application.
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|
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