By maintaining 55% relative humidity in sanding decks, dust is suppressed and static build-up reduced.
This prevents airborne paint dust from being attracted to the surface of the bodywork, greatly decreasing sanding time and improving the quality of the finish.
As these areas are usually very warm, the air supplied to them from central air handling units is cold with low moisture content.
Direct air humidification is therefore required and is typically provided by spray systems as they oﬀer humidity control as well as around 39.2°F (4°C) of evaporative cooling.
Paint Spray Booths
The optimum humidity for the transfer of paint from the spray nozzle to bodywork is 72% relative humidity. Correct humidification prevents the evaporation of water-based paint, allowing it to reach the bodywork as the manufacturer intended. Combating paint evaporation also reduces the introduction of paint dust to the spray booth.
These benefits combine to improve the finish quality of the bodywork, reduce sanding requirements and lower paint costs by avoiding atmospheric losses.
Paint spray booths are typically served by central air handling units that employ in-duct humidifiers.
Exhaust emission testing must be carried out within specific temperature and humidity ranges so it is important that humidification systems can meet the control tolerance required and provide reliable and consistent humidification.
Electric steam humidifiers are often used to provide close humidity control while gas-fired steam humidification, evaporative humidifiers or in-duct spray systems can offer a lower cost and lower maintenance alternative.
- General Motors
- Kay Automotive Graphics