During the electrostatic powdering process, an electrical field is created between the powder and the material to be coated. The powder, interlaced with compressed air and electrically charged when it emerges, is drawn to the surface of the material to be coated through the different powder/material polarity. In addition to the immediately accessible surface, the back sections and the reverse can also be reached and coated.
Due to its charge, the powder adheres well to the surface, and is melted and cross-linked during the subsequent thermal treatment. This takes place in a temperature range from 160 to max. 200°C, in which the object temperature and dwell time are largely dependent on the bonding agent base. After cooling, the coating is well-bonded, even and durable.
The appearance of a powder coating is determined by
- The colour of the powder used
- The glossiness of the powder used
- The flow of the powder used (surface texture)
- The content and form of the pigment effect
- The burn-in conditions