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48
GM 5000EAC.
B_00071
OPERATING MANUAL
EDITION 03/2012 PART NUMBER DOC 2319150
6.6.4 CHECK SPRAY PATTERN
Start AirCoat spraying (without electrostatics)
1. Start up with material supply set to approx. 8 MPa; 80 bar; 1160 psi operating pressure.
2. Spray (release trigger safety catch and pull trigger) and check the atomisation.
3. Set the fl uid pressure on the material supply to the point where a further increase in fl uid pressure would
signifi cantly improve fl uid atomization.
4. Open air pressure regulator for the atomizer air and adjust so as to achieve optimal atomization. The
interrelation between spray pattern and atomizer air is shown in the fi gure below.
5. With the air adjustment on the gun, the ratio form adjustment to atomization until the optimum spray
pattern is achieved.
Note:
Repeat point 4 and 5 until the optimum spray pattern is reached (process iterative).
Spray pattern
no atomizing air too little atomizing air correct amount of atomizing air
Infl uence of the air adjustment on the spray pattern shape
The spray pattern can be adjusted to suit the object being sprayed using the air adjustment. The illustration
below shows the infl uence of the shaping air regulator on the spraying pattern.
Other nozzle sizes can be used to obtain larger or smaller spraying patterns.
Closed
air adjustment
Completely opened
air adjustment
Note:
The paint output volume can be changed by:
•
Changing the material pressure or
•
using a different fl at jet nozzle (see chapter 9).