The widespread use of low solvent, water-borne base coats and paints means that humidity control is essential in spray booths. Relative humidity (RH) levels as high as 65-75% are often used for water-based paints, delivering consistent spray quality by preventing aerosol evaporation and pigment agglomeration, consistent deposition rates and preventing premature drying.

RH幹燥過程是不可取的,高course, but when metal components leave the oven the local environment in sanding, repair and inspection areas can be hot and dry. This leads to worker discomfort and electrostatic build-up, drawing dust to the component. Using a humidifier as anevaporative cooler打擊這兩個問題同時,冷卻the air for a safer, more productive environment and raising the RH to discharge electrostatic. An inspection deck at 35°C / 15% RH can be cooled to 22°C / 65% RH economically and effectively using this principle.

Electrostatic painting and powder coating booths

Economic and environmental imperatives such as waste reduction, overspray control, particulate recovery and solvent reduction, mean that electrostatic paint and powder coating is now very widely used, particularly in large industrial applications in robotic, manual and conveyor booths. The process is dependent on maintaining a differential charge between the powder and earthed item, giving good coat uniformity directly and indirectly, minimal overspray and reduced waste.

如果RH太高，則靜電電荷的效果被破壞，塗層粘附受影響，並且相同的表麵需要更高的流速。在低相對濕度下，電暈的充電特性受到影響，因此粉末不會被正確充電，並且粉末和物品之間的轉移效率較低，導致膜厚度不足和法拉第籠效應。成本上升和浪費增加。Low RH還提供電弧的潛力。

Dipping and electroplating

在多級塗層和表麵處理過程中，金屬物品從罐移到罐中。在熱，幹燥氣候缺乏氣氛在大氣中缺乏水分會導致一份過早幹燥，特別是如果有延遲和工作不能移動到下一階段。這導致表麵幹燥不均勻，導致染色並影響隨後的過程罐中的表麵。剝離和重新加工這件作品是耗時和浪費的。保持50-60％RH的空氣中的相對濕度可防止快速表麵幹燥。

Controlling the painting and coating environment

Commonly, control over air temperature and relative humidity will be provided by an air handling system,fitted with a humidifier,delivering conditioned air directly to one or more spray booths. This might be supplied by the booth manufacturer or designed separately and supplied by an air handling unit (AHU) manufacturer.

For individual spray booths within a premises, an associated AHU may be incorporated or a positive pressure containment room in which materials and equipment can also be kept is built around the booth, conditioned to provide the appropriate temperature, RH and air filtration.

有關濕度控製的建議，Condair是世界領先的領域，擁有多年的使用塗料噴霧展位製造商，AUH製造商和最終用戶的經驗，以提高塗裝和粉末塗料的生產力。