Specifications
12
13
AIRLESS SPRAY TROUBLESHOOTING
Coarse spray Low pressure Increase the pressure.
Excessive fogging High pressure Reduce the pressure to satisfactory pattern distribution.
(overspray) Material too thin Use less thinner.
Pattern too wide Spray angle too large Use smaller spray angle tip.
Pattern too narrow Spray angle too small Use larger spray angle tip (if coverage is OK, try tip
in same nozzle group)
Too much material Nozzle too large Use next smaller nozzle.
Material too thin
Pressure too high Reduce pressure.
Too little material Nozzle too small Use next larger nozzle
Material too thick
Thin distribution in Worn tip Change for new tip.
center of pattern Wrong tip Use nozzle with a narrow spray angle.
"horns".
Thick skin on work Material too viscous Thin cautiously.
Application too heavy Reduce pressure and/or use tip in next smaller nozzle
group.
Coating fails to Material too viscous Thin cautiously.
close & smooth over
Spray pattern irreg- Orice clogged. Clean carefully.
ular, deected Tip damaged Replace with new tip.
Craters or pock Solvent balance Use 1 to 3% "short" solvents remainder "long" solvents
marks, bubbles (this is most likely to happen with material of low
on work viscosity, lacquers etc.)
Clogged screens Extraneous material Clean screen
in paint.
Coarse pigments Use coarse screen if orice size allows.
Poorly milled pigments Use coarser screen, larger orice tips. Obain ball
(paint pigments glocculate) milled paint. If thinner has been added, test to see if
a cover screen. Incompatible drop placed on top of
paint mixes or attens out on the paint mixture &
thinners on the surface. If not, try different thinner in
fresh batch of paint.
TEST THE PATTERN
Good, full Spotty Pattern, Increase Pressure.
DEFECTS CAUSE CORRECTION