Contamination

Cause	Correction
Inadequate sieve machine.	If a smaller mesh size is not sufficient, a sieve machine with ultrasound must be considered
If the conveyor is not cleaned regularly or inappropriate lubricants are used.	Clean regularly, attach a cover if necessary
If powder is blown-off in the curing oven.	Check the air currents in the building
Powder residue in the oven.	This can be prevented by regular cleaning
Poorly clean recovery.	Regular cleaning
Dirty air is sucked into the booth.	Here, the coating plant may need to be separated from production areas
If several booths are operated together, cleaning may cause an impairment may occur.	In this case, the booths must be separated from each other