Process Description - Electrostatic Technology 802 Manual

Electrostatic Technology, Inc.
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PROCESS DESCRIPTION

Powder particles are aerated in a fluidizing chamber and are electrostatically charged by
ionizing 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.
Serial #15681
Model 802 Armature Coater
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