| Power Coating Common Problem Reason Analysis & Solution | ||
| Problem | Reason Analysis | Solutions |
| Poor weather resistance and mechanical properties | 1.Bad pretreatment 2.Low furnace temperature or insufficient curing time 3.Poor powder quality |
1.Improved pretreatment 2.Adjust curing process 3.Contact suppliers |
| Coating surface shrinkage & pinhole | 1.Compressed air is not clean 2.The powder coating system is contaminated 3.High voltage & too close to the gun will cause powder anti - ionization 4.Bad powder quality |
1.Strengthen the treatment of compressed air purification 2.Clean the powder coating system 3.Adjust voltage and gun distance to appropriate range 4.Contact suppliers |
| Coating surface have seriously variegated colour | 1.Bad powder quality 2.The powder coating system is contaminated 3,Drying oven inside have carbides, not clean |
1.Contact suppliers 2.Clean the powder coating system 3.Stop and clean the oven |
| Coating surface have serious particles (sand point) | 1.Bad powder quality 2.The powder coating system is contaminated 3.coating surface thickness Less than 45um. 4.Dusting environment, oven is not clean |
1.Clean the powder coating system 2.Contact the supplier 3.Adjust powder coating process 4.Clean the oven and strengthen the management of poawder coating area |
| Pattern powder coating have small pattern or bad pattern | 1.High voltage, high pressure, resulting in separation of powder 2.The heating rate is too slow 3.The workpiece is thick and heavy, and the heat transfer rate is slow |
1.Reduce operating voltage and pressure 2.Preheat the oven 3.Preheat and spray the workpiece |
| The rate of powder coating is lower | 1.Powder quality and particle size distribution are not good 2.Improper grounding of workpiece 3.Too much added recycled powder (> 40%) 4.Powder damp, high water content |
1.Contact the supplier 2.Clean up hangers and improve workpiece grounding 3.Reduce the amount of recycled powder added to a reasonable level 4.Improve powder storage environment |
