Adjust the Atomization
1.Do not turn on atomizing air supply. Fluid pressure is controlled by the air pressure supplied to the pump (pump air regulator). Set fluid pressure at low starting pressure. For low viscosity fluids (less than 25 sec, #2 Zahn cup) with lower percent solids (typi- cally less than 40%), start at 300 psi (2.1 MPa, 21 bar) at pump outlet. For fluids with higher viscosity or higher solids content, start at 600 psi (4.2 MPa, 42 bar). Refer to the following example.
Operation
Adjust the Spray Pattern
Packages with Airless Guns
The spray tip orifice and spray angle determine pattern coverage and size. When you need more coverage, use a larger spray tip rather than increasing fluid pressure.
Align guard horizontally to spray a horizontal pattern. Align guard vertically to spray a vertical pattern.
Packages with AA Guns
1.See FIG. 6. Close off pattern adjustment air by turn- ing knob (AA) clockwise (in) all the way. This sets gun for its widest pattern.
Example: |
|
|
| |
|
| Pump Air |
| Approximate |
Pump |
| Regulator Setting |
| Fluid Pressure |
Ratio |
| psi (MPa, bar) |
| psig (MPa, bar) |
|
|
|
|
|
15:1 | x | 20 (0.14, 1.4) | = | 300 (2.1, 21) |
30:1 | x | 20 (0.14, 1.4) | = | 600 (4.2, 42) |
2. | Hold gun perpendicular and approximately |
| 12 inches (304 mm) from surface. |
3. | Move gun first, then pull gun trigger to spray onto |
| test paper. |
4. | Increase fluid pressure in 100 psi (0.7 MPa, 7 bar) |
| increments, just to the point where a further |
| increase in fluid pressure does not significantly |
AA
OUT (narrower pattern)
FIG. 6. Pattern Air Knob
AA
IN (wider pattern)
TI6559A
improve fluid atomization. Refer to the following |
example. |
Example: |
|
| Pump Air Regulator |
| Incremental |
Pump |
| Increment |
| Fluid Pressure |
Ratio |
| psi (MPa, bar) |
| psi (MPa, bar) |
|
|
|
|
|
15:1 | x | 7 (.05, 0.5) | = | 100 (0.7, 7.0) |
30:1 | x | 3.3 (0.02, 0.2) | = | 100 (0.7, 7.0) |
2.See FIG. 7. Set atomizing air pressure at about 5 psi (0.35 bar, 35 kPa) when triggered. Check spray pat- tern, then slowly increase air pressure until tails are completely atomized and pulled into spray pattern.
Do not exceed 100 psi (0.7 MPa, 7 bar) air pressure to gun.
313255F | 15 |