Function And Identification; Function - Krautzberger KAA 1300 Operating Instructions Manual

ENGLISH
Automatic spray gun KAA 1300

1 Function and identification

1.1

Function

The KAA 1300 automatic spray gun serves the purpose of automatic (non-manual) coating of sur-
faces like metal, plastic, ceramic, wood, as well as other suitable surfaces.
Typical coating materials include paints, dyes, water-soluble paints, adhesives, anti-adhesives etc.
Abrasive materials can also be processed with a working pressure below 5 MPa (50 bar). The
automatic spray gun operates based on the airless principle, which means the spray jet is exclu-
sively generated by the material pressure, which presses the material through a nozzle. A pump
supplies the material with a maximum pressure of 2.5 MPa (250 bar) through a hose, which is
designed for a respective pressure charge, leading to the material connection of the automatic
spray gun. Compressed air is added to the control air connection to control the spray process. The
air flowing into the air chamber completely moves the piston and thereby the valve needle back-
wards against the pressure of the spring. This provides access to the front opening of the valves
seat screw and under high pressure the material flows into the material nozzle. Here, it exits as a
flat, broad material jet and meets the workpiece that needs to be coated.
After exiting the nozzle, the spray jet takes the shape specified by the nozzle. It is directed towards
the workpiece. The effective spray jet is not quite as wide as theoretically possible.
The particles of the spray jet reach far higher speeds than with spray guns driven by compressed
air. The material flow rate is respectively higher and the jet is sharper, which means the turbulence
zone is smaller. The volume and shape of the jet can only be modified by changing the nozzle. The
diameter of the nozzle bore determines the material flow volume, while the size and geometry of
the elliptically shaped nozzle opening determine the height and width of the jet (shape of an ellip-
tical cone). A large number of airless nozzles are available. They can only be purchased from
Krautzberger GmbH.
The nozzle can be seamlessly turned in the axis of the spray jet by 360° and locked into place in
any position. This allows an optimal adjustment of the angle with which the jet hits the workpiece to
the respective conditions.
Coating materials approved for spray applications by the coating material manufacturer may be
used and Krautzberger GmbH offers special designs for materials dissolved in chlorinated hydro-
carbon containing solvents as well as abrasive or corrosive materials.
The automatic spray gun can be operated both as an individual device as well as in a larger
system together with other spray guns (e.g. as a component of a fully-automatic coating system as
well as a spray robot).
The use is particularly suitable where comparatively large volumes of material need to be pro-
cessed per unit of time. Compared to spray guns driven by compressed air, an additional
advantage is that there is less spray mist, ensuring that a far greater percentage of the coating
material reaches the workpiece.
Item number: 200-0201 GB–5