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Identification |
Possible cause |
Remedial action |
|---|---|---|
| From insufficient film thickness to finely textured surface | Insufficient deposition | Increase high voltage, check spray nozzles |
| Output of powder too low | Increase powder flow | |
| Blowing-off effect | Reduce amount of air | |
| Flow of powder too high, together with low application voltage | Reduce powder output, increase voltage | |
| Insufficient charging during tribo application | Use appropriate charging method (corona charging) |
Identification |
Possible cause |
Remedial action |
|---|---|---|
| "greying", missing metallic effect | Wrong or different charging procedure, hence a different alignment of metal effect pigments | Corona charging recommended, standard application procedures need to be used for each powder |
| Objects do not match in terms of colour or effect | Powder being used is not correctly bonded and cannot be reclaimed; results in separation of powder base and metal effect pigments | Use powder that can be reclaimed (bonded), ensure that the ratio of virgin powder to reclaim meets the powder manufacturers recommendations; motto "Stop messing about with half measures, and do the thing properly." |
| Use powder "spray to waste" (costs, disposal) | ||
| Batch change during a job | Use same batch of powder during a single job | |
| Powder separating in powder hopper | Use fluidised bed hopper to avoid partial separation | |
| Objects do not match in terms of colour or effect | Colour differences between automatic and manual coating process | If possible, do not use manual coating after automatic application but do any manual coating prior to automatic application |
| Different substrates | Produce colour standard and colour tolerance standards for different substrates | |
| "Differences" with the customer regarding the colour | Agree upon colour standard and agree tolerances confirmed by standard panels |
Identification |
Possible cause |
Remedial action |
|---|---|---|
| Appearance of irregular light dark effects on substrate | Wrong space between sprayguns, different charging, improper sine curve, insufficient earthing | Optimise coating plant parameters |
| Obviously different film thicknesses | Minimise variations in film thickness | |
| Automatic coating process with subsequent manual application | Use manual pre-coating where manual reinforcement is required |
