Troubleshooting – Output of Powder Insufficient to Coat Parts

Posted by: FEIHONG Powders |on July 10, 2018

Problem,Cause and Remedy

PROBLEM	CAUSE	REMEDY
Poor fluidizing properties in the powder hopper	Pressure of fluidizing air too low	Adjust (increase) pressure of fluidizing air
	Fluidizing membrane is blocked	Clean or replace the fluidizing membrane: see instructions of equipment supplier.
	Humidity of compressed air too high	Install an air dryer with a corresponding oil-micro filter or another suitable drying system.
	Humidity of the powder too high	Check storage facilities. Powder shall be stocked at room temperature in closed packing (maximum humidity 75%)
	Free-flowing properties of the powder are bad	Contact your powder supplier
Blockage in venturis and hoses	Fusing of the powder in the venturi.	Clean or replace the venturi (see instructions of the equipment supplier). If necessary, reduce pressure of powder of transport air
	Fusing of the powder in the hoses	Clean the hose by bending and breaking up the fused powder; if necessary replace it.
	Fusing of the powder in the hoses	Install an air dryer with a corresponding oil micro filter or an air dryer with a corresponding oil micro filter or another suitable drying system.
	Bad free flowing properties of the powder.	Contact your powder supplier.
Blockage in the gun	Fusing in the gun or gun outlet.	Clean the gun according to the instructions of your equipment supplier. When blocking occurs, frequently check humidity of compressed air and the free-flowing properties of the powder.
Blockage in the gun	Blockage caused by contamination of the powder with dust of other coarse materials.	Clean the gun according to the instructions of equipment supplier and determine the reason of this contamination. (Check powder pumps for possible impact fusion. Impact fusion particles which break off in the pump could be transported to the spray gun and result in blockage.)