Principles Of Operation - EC-PACK EC-JET 1000Pro Manual

Principles of Operation

2.3
A conducting ink is supplied under pressure to an ink gun and forced out through a small nozzle of
typically 40 to 70 micro diameters. As it passes through the nozzle the liquid is piezo-electrically pulsed
(modulated) and the stream breaks up into a continuous series of drops which are equally spread and are
of the same size.
a raster.
Guangzhou EC-PACK Packaging Equipment Co., Ltd.
EC-JET 1000Pro Continuous Inkjet Printer
Surrounding the jet at the point where the drops
separate from the liquid stream is a charge
electrode. A voltage is applied between the
charge electrode and the drop stream. When the
drop breaks off from the stream it carries a
charge proportional to the applied voltage at the
instant at which it breaks off. By varying the
charge electrode voltages at the same rate as
the drops are produced, it is possible to charge
every drop to a predetermined level.
The drop stream continues its flight and passes
between two deflector
maintained at a constant potential, typically plus
and minus 5 kilovolts. In the presence of this field
a drop is deflected towards one of the plates by
an amount proportional to the charge carried.
Drops which are uncharged are unelected and
are collected by a gutter to be recycled into the
ink tank. Those drops which are charged, and,
therefore, deflected, are printed on the substrate,
which is travelling at a certain degree and speed
to the direction of the drop deflection.
By varying the charge on the individual drops,
whatever pattern
alphanumeric characters) may be printed. A
series of
drops deflected across the substrate is known as
15
plates which are
is required (including