Liquid paint can be applied in many different ways. The type of industrial application process will be determined by the product, the volume, the quality requirements and other factors.
1. Paint can be applied by spray method using conventional handheld spray guns, high volume low pressure (HVLP) guns, automatic guns, automatic rotary bells or disks. The spray equipment can be either non-electrostatic or electrostatic. The typical paint used for such wet on wet process is epoxy or polyurethane. Paint is normally baked.
2. When painting components with corners & crevices, spray cannot reach each & every area. In addition if the component needs high corrosion resistance, then electrophoretic technology is more appropriate for depositing the primer paint and is followed by spray with top coat of paint. Typical components requiring this technology are auto components.
3. Large components need different treatment. These are shot blasted, phosphated followed by primer coat of paint which is either applied through manual spray or electrophoretic coating.
This is followed by spray top coat (normally poly urethane) and is forced dried at 70-80 degrees centigrade temperature.
4. For plastic parts, spray coating is used.
The actual layout and specific equipment vary widely, but all paint lines have the same stages;
- Loading area
- Pre treatment or cleaning stage
- Application stage
- Curing stage
- Unloading area