Powder Supply Problems

 

Trouble

Possible Causes

Solution

Poor blowing out of hopper

Fluidisation air pressure too high

Adjust air regulator to lower pressure to fluid bed.

Insufficient hopper ventilation

a)  Check hopper vent for plugging.

b) Check vent assist device for obstruction and proper air supply.

No air percolating through powder surface

Insufficient air pressure

Check hopper fluidisation air supply.  Increase air pressure as required.

Plugged membrane

Check membrane for plugged pores from dirty or oily air supply.

Obstructed membrane

Check bottom of hopper for obstructions.

Compacted powder on membrane

Manually loosen powder and fluidise well with clean, dry air.

Poor fluidisation/air blowing large holes through powder surface

Powder level too low

Add powder until hopper is filled to proper level.

Packed or moist powder

a)  Manually loosen powder and fluidise well with clean dry air.

b) Check compressed air and booth air for high humidity or oil content.

c)  Powder sieving may be required.

Obstructed membrane

Check bottom of hopper for obstructions.

Plugged or broken membrane

a)  Check membrane for plugged pores or oil contaminated air supply, cracks or holes.

b) Check for proper seating of membrane/leaking around edges.

Powder particle size

a)  Maintain consistent blend of virgin & recycled powder.

b) Check particle size of powder in hopper.

Insufficient fluidising characteristics of powder

Contact your powder supplier.

Plugged hoses and/or powder pumps from impact fusion build up

Normal build up

Clean or replace parts.

Air pressure too high

a)  Reduce powder hose length.

b) Turn down air settings on pumps & guns.

Moisture in air supply

Check air supply for clean, dry oil free air.

Composition of powder feed hoses

Check hoses.  Contact your equipment supplier.

Worn powder pumps and worn parts

Replace all worn parts.

Powder particle size

a)  Maintain consistent blend of virgin & recycled powder.

b) Check particle size of powder in hopper.  Contact your powder supplier.

Powder type or formula

Some powder types are more susceptible to impact fusion.  Contact your powder supplier.

Kinked or flattened hoses

a)  Avoid sharp bends and restrictions in the hose.  Protect hoses from external abrasion & abuse.

b) Replace if permanently deformed.

Powder hose too long or has too many sharp bends

Reduce powder hose length, modify hose runs.

Insufficient powder feed

Powder not fluidising

Refer to ‘No air percolating through powder surface’ & poor fluidisation/air blowing large holes through powder surface’ above.

Obstruction of powder delivery system

a)  Check suction tubes, powder pumps, hose & gun.

b) Check air supply.  Adjust air settings to pump & guns.

c)  Check powder supply for contamination.

Powder hose too long or has too many sharp bends.

Reduce powder hose length;  modify hose runs.

Low air pressure

Check air supply.  Adjust air settings to pump and guns.