Booth and Recovery Equipment Problems
Trouble |
Possible Causes |
Solution |
Part surface contamination |
Powder or contamination failing in spray booth from conveyor or hangers |
Clean conveyor regularly for continuously before it enters powder spray booth. Strip hangers as needed.
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Contamination from parts entering spray booth |
Check cleaning and pretreatment equipment for proper operation. Ensure proper part drying before part enters spray booth.
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Contamination from plant air circulated through spray booth |
Isolate spray booth area. Preferably enclose in a room with filtered humidity controlled air. Maintain positive pressure in coating room. Inspect nearby operations as possible contamination sources; correct as necessary.
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Contamination from compressed air supply |
Check compressed air supply system.
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Powder sieve screen torn, missing |
Replace sieve screen.
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Inoperable powder sieve |
Repair sieve or sieve control circuitry or replace if necessary
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Poor powder containment. Inadequate air flow through spray booth |
Primary filter media binding |
a) Clean or replace filter media as required. b) Check ambient air humidity in coating area. c) Check filter media air pulse operation. d) Check for moisture/oil in compressed air supply.
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Final filters clogged |
Check primary filter media for powder leakage. Service, repair or replace as needed.
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Use of compressed air for booth cleandown |
Refer to operations manual for proper cleaning procedures.
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Improper powder gun placement/ alignment |
Correct as necessary, position guns away from openings.
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Room draughts leading to powder drifting from booth. |
Map airflow in powder booth area. Minimise draughts to eliminate powder drift.
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Blocked airflow |
a) Check air volume control damper adjustment. b) Check fire safety device for proper operation.
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Inadequate blower operation |
Check for proper operation.
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Cross contamination of recycled powder |
Inadequate booth/recovery equipment cleaning |
Clean equipment per equipment supplier recommendations.
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Booth Turbulence |
High powder containment air velocity |
Contact equipment supplier.
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Powder recovery percentage below equipment specification |
Insufficient air volume/velocity |
Refer to ‘Poor powder containment. Inadequate air flow through spray booth’ above.
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Poor system seals |
Verify and correct any air leaks.
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Too high a percentage of powder fines |
Contact your powder and equipment suppliers.
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