Electrostatic Technology, Inc
FlexiCoat
®
Model 300 Coater
2
Serial
#20158
3 OPERATING
PRINCIPLES
3.1
SCHEMATIC DIAGRAM OF AN ELECTROSTATIC COATER
3.2
PROCESS
DESCRIPTION
Powder particles are aerated in a fluidizing chamber and are electrostatically charged
by ionized air forced through a porous plate at the base of the chamber. As the
powder particles become charged, they repel each other to such a degree that they rise
above the chamber forming a cloud or veil of charged particles. When a grounded
object is placed in this cloud, or conveyed through this cloud, the charged powder
particles, because of their opposite potential, are attracted to it. As the particles
become attached to the object, they form a uniform coating, being more attracted to
exposed areas than to those already insulated. The longer the object is exposed to the
cloud, the thicker the coating becomes, until saturation eventually takes place.
Coating thickness is controlled by applied voltage to the charging media and exposure
time to the cloud. Because of the high voltage capability of the charging media, a
sufficiently great potential exists between it and most substrates to permit even natural
insulators to be coated. Unlike equipment with exposed electrodes, Electrostatic
Technology, Inc.'s unique air ionization process charges the powder without permitting
the powder, the object, or the operator to come in contact with the charging media.
