Group 6
Operation – functional principle
Page 44
Release 3.00
Leibinger-Jet 2 se
6.2 Functional principle
6.2.1 Method of working
The Leibinger-Jet 2 works in accordance with the continuous ink jet process. In this a
constant ink jet is emitted from a jet nozzle which is broken down into a series of equal
size drops under the influence of mechanical oscillations.
If required these drops are individually charged up electrostatically and deflected into a
constant electrical field depending on the charge. As a result not just one point but rather
a line of points can be applied contact-free with one jet. If the product used is moved
vertically to the drop deflection two-dimensional patterns (characters) can be created.
The drops that are not required for a programmed inscription are not charged and flow
uninfluenced through the electrical deflection field into a gutter. In the gutter the drops
are sucked up by a suction pump and fed back into the ink tank. Depending on the
application alphanumeric data can be entered with the LCD touch display.
Data for font and texts are stored in the device (even in the event of
power failure). If required it can be called up, altered or deleted
quickly and easily.
6.2.2 Drop creation
During the drop creation the ink is pressed through a jet nozzle under pressure and at
the same time modulated in such a way by highly frequent sinus oscillations that are
imposed on the drop that it attaches itself to the nodal points of the oscillations and
breaks down into individual drops at a specific distance
lA
(please see the following
figure “Creation of a character”)
from the jet. The oscillations are created with an
oscillatory system that is excited by a Piezo oscillator.
6.2.3 Drop charging
In order to be able to charge the drops it is necessary for the ink to have electrical
conductivity. This is possible through the use of specific salts that dissociate in the
solvent used. The drop brake-off point of the modulated jet is automatically set in such a
manner that this happens inside the charging electrode.
