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OBSOLETE

21-37

Issued 7/96

Troubleshooting

Figure 2 shows some common spray pattern faults.
Troubleshooting procedures for these and other
common film-build faults are listed in Table 3. If you

cannot solve your problem with the information given
here, contact your local Nordson representative or
distributor for help.

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2137002A

Fig. 2 Common spray pattern fault

1. Blown pattern

2. Heavy bottom pattern

3. Heavy top pattern

4. Heavy left side pattern

5. Heavy right side pattern

6. Heavy center pattern

7. Spitting pattern

Table 3 Troubleshooting Procedures

Spray Pattern/

Film Faults

Corrective Action

Blown pattern

Reduce pattern/horn air; increase coating material pressure.

Heavy top or
Heavy bottom

Rotate air cap and trigger spray gun; if problem exists, clean air cap; if problem does not
exist, clean fluid tip or replace air cap; change coating material mixture, if necessary.

Heavy left side or
Heavy right side

Rotate air cap and trigger spray gun; if problem exists, clean air cap; if problem does not
exist, clean fluid tip or replace air cap; change coating material mixture, if necessary.

Heavy center

Increase atomizing air, increase pattern/horn air, or reduce coating material viscosity.

Spitting

Purge air bubbles in fluid line; adjust puller; raise atomizing air and reduce fluid pressure;
increase pattern/horn air; raise coating material temperature.

Runs and sags

Purge air bubbles in fluid line; adjust puller; raise atomizing air and reduce fluid pressure;
move farther from substrate, increase pattern/horn air; raise coating material temperature.

Dry spray

Reduce atomizing air; reduce pattern air; change coating material mixture.

Poor or no wrap

Check electrostatic power supply; clean spray gun; remove water from supply air; check
substrate ground; check spray gun for internal leakage.

Poor coverage in
recesses

Raise atomizing air and coating material pressure; reduce electrostatic power supply
voltage; move closer to substrate.

1996 Nordson Corporation

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