The technical characteristics
of the FlatJet are listed below:
FlatJet head is approximately 20x25x1mm in size ejecting ink
at a bevel-angle of about 45°. (See figure left). A sequence of such
printing heads can be built without any difficulty because they can
be placed within 2 or 1.5 mm from each other in the full width of
the paper, and if they are operated simultaneously parallel printing
of the pixel depends mainly on the distance between the printing
head and the printed material. The pixel density is in direct
proportion to the length of the activating time, similarly to
an electromagnetically controlled airbrush system. Approximately
600µs activating time is required to achieve full coverage of
a pixel which is 2mm in diameter, whereas for a dot which is 0.5mm
in diameter 50µs is sufficient. The intended density levels can
be adjusted smoothly by the time.
previous tests have shown that a wide range of commercial
inks, often used in the printing industry can be applied to
the FlatJet provided that their viscosity can be reduced
to a certain level, and the difficulties caused by drying
of the ink can be overcome. We are currently using a diluted
water disperse printing ink with a high pigment content. A
major advantage of the FlatJet is that different kind
papers and textiles can be.
Mass production of the FlatJet head can easily
be automated thanks to its simple mechanical structure.
If serial production is considered the need for manual
assembly can be eliminated. The quality of the final product
can be controlled through electric tests during production.
The production costs of a FlatJet printing head
is estimated at around $0.2. The simple structure of the
printing head accounts for its durability and reliability.
In case one of the printing heads breaks down in the parallel
printer it can be replaced without any difficulty.
The FlatJet printer can reach a printing speed
of up to 1-1.5m printed paper per
second. It means that if the width of the printing
blocks is 1m (in our prototype the width is 21cm)
it takes only 13 seconds to print a 13sqm billboard!
The billboards printed at this speed may as well be
entirely different. The printer does not require readjustment
or a switch-off if the pictures are changed..