| Problem |
Possible Reasons for Problem |
Solution |
| Application |
| Powder is not suspended in the suspension chamber |
Powder is moist |
Add a moisture absorbing additive according to Univercol's instructions and check the quality of the compressed air (presence of water in the piping). |
| Blockage in the lower screen of the suspension chamber. |
Check and clean the screen and replace if necessary. |
| Particle size distribution. |
Increase the percentage of virgin powder and contact Univercol's technical representative. |
| Low quantity of powder in the suspension chamber. |
Add powder up to the level of 2/3 of the suspension chamber. |
| Polymerization / hardening of powder in the piping and valves |
Moisture in the air |
Add a moisture absorbing additive according to Univercol's instructions and check the quality of the compressed air (presence of water in the piping). |
| Particle size distribution |
Increase the percentage of virgin powder or contact Univercol's technical representative. |
| Structure and composition of powder piping. |
Check piping |
| Powder with low Tg |
Contact Univercol's technical representative |
| Powder |
| Lack of coverage / low thickness / adhesion problem |
Low loading of the powder |
Contact Univercol's technical representative |
| Grounding problems |
Check the grounding and clean the points of contact |
| High air pressure in guns |
Reduce pressure according to the manufacturer's instructions |
| Incompatibility between the quantity of powder leaving the gun and the conveyer belt speed |
Readjust conveyer belt speed |
| Undesirable airflow in the painting chamber |
Check blower pressure and location and the possibility of external air currents |
| The gun nozzle is inappropriate for the product's geometry |
Use a nozzle suitable for the type of product |
| Incorrect location of guns relative to the product being painted |
Adjust and align the guns |
| Low penetration of corners |
Corona / Faraday cage |
Gradually increase air pressure and reduce electrical power of the gun |
| Incorrect gun location |
Adjust and align the guns to reach the problematic corners |
| High voltage of the gun |
Reduce voltageח |
| Increased powder feed |
Reduce air pressure in order to prevent powder from falling off the product |
| Back ionization |
Increased accumulation of powder (mainly in the corona) |
Reduce powder coat thickness / reduce powder flow. Increase the distance between the guns and the product being painted |
| Non-uniform flow of powder from the gun in the direction of the product being painted ("spitting") |
Partial blockage of piping by powder. Varying air supply. Particle cross section too small. |
Check the possibility of residual oil or moisture in the air that is supplied to the guns. Check the compressor. The possibility of glomeration of the powder. Add virgin powder and contact Univercol's technical representative. |
| Powder Coating |
| "Orange peel" |
Coat thickness too low or too high |
Check the optimal thickness that can be applied with the powder producer |
| High reactivity powder |
Generally powders intended for low temperature baking. Contact Univercol's technical consultant. |
| Non-optimal distribution of the particle size |
Contact Univercol |
| Back ionization - corona guns |
Contact the gun manufacturer |
| Higher than expected gloss |
Insufficient baking of the paint powder |
Low baking temperature. Check oven temperature. Baking time shorter than required. Adjust the conveyer belt speed to the required baking time. |
| Lower than expected gloss |
Contamination of the powder with "foreign" powder (with a different chemistry) |
Clean the painting system (suspension chamber plus piping plus guns) |
| Overbaking |
Check oven temperature and check how long the product remains in the oven. |
| Problems with adhesion of the coating to the surface |
Underbaking |
Surface treatment problem. |
| Adjust the baking conditions for the paint powder |
Chemical treatment - check the quality of the solutions. Contact the supplier. Sandblast or clean with steel particles - check the condition of the particles and the possibility of oil on the particles. |
| Yellowing (mainly of whites and light colors) |
Higher than required oven temperature and/or longer than required baking time. |
Adjust the baking conditions for the paint powder |
| Craters |
Oily / silicone contamination |
Check for the presence of a source of oil or silicone in the painting area. Contact Univercol's technical consultant. |
| Contamination and bumps on the painted surface |
External dirt in the painting area |
Check the painting area, including surface treatment, guns, painting chamber and oven. |
| Large particles in recycled powder |
Sift the recycled powder (250-300 micron screen). Check the condition of the screen. |
| Delivery of contaminated powder |
Contact Univercol's technical consultant. |
| Dirt in the form of painted spots on the coating |
Contamination from other powders as a result of incorrect color changes. |
Clean the painting chamber, piping and guns thoroughly when switching from one color to another. |
| Delivery of contaminated powder |
Contact Univercol's technical consultant. |
| Obtaining a smooth surface when painting with texture powder (wavy texture) |
Contamination of textured powder with smooth powder |
Clean the suspension chamber, piping and guns. |
| Pinholes |
Surface preparation problem |
Make sure the surface preparation is performed properly, including dry times. |
| Application on galvanized metal and cast metal |
Use of Univercol's HB powders |
| Inferior mechanical properties |
Insufficient baking of the paint powder |
Contact Univercol's technical consultant. |
| Low chemical resistance |
Partial baking of the paint powder |
Contact Univercol's technical consultant. |
| Low anticorrosive resistance |
Underbaking |
Check the ovens. |
| Deficient surface preparation |
Check the condition of the surface preparation system. |
| Low coat thickness / painting defects |
Contact Univercol's technical consultant |
