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3.3 Print head ventilation / JET RAPID Wire (PI) and Speed Plus
The JET Rapid Wire (PI) and Speed Plus printers are equipped with a print head ventilation.
The print head ventilation ensures longer cleaning intervals and reduces the risk of
condensation within the print head.
3.3.1
Basics about the functionality of the printhead ventilation
The print head of the JET Rapid Wire (PI) and Speed Plus printer has to be mounted at a
distance between nearly zero und 5 mm to the substrate. This close installation provides the
shortest trajectories for ink droplets. This is the basic requirement for a fast and precise print
out. However, it also bears the risk of contaminating the print head by bursting ink droplets.
With the head ventilation there is a constant air stream at the outlet of the print head that
works like a protective shield against the remains of ink droplets that burst on the surface of
the substrate.
Example: print head ventilation of the RAPID Wire (PI) with stepped head cover
The print head of the JET Rapid Wire (PI)
during the printing process. The ink jet is
illustrated as a series of
With the JET Rapid Wire (PI) the distance
between the substrate, normally a cable,
and the print head is nearly zero.
High Speed Line
red
droplets.
The illustration shows an enlargement of
the print head. The
red ink droplets
on the surface of the substrate, causing
smaller droplets that are bouncing back in
the direction of the outlet of the print head.
The compressed air of the head ventilation
is illustrated as
blue
droplets. With the
slight over pressure in the print head, the
compressed air prevents the intrusion of ink
droplets into the print head.
burst
Release R.1.02
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