Why treat compressed air
Plastic builds up charge during processing. Air that isn't deionized doesn't discharge it: dust clings to the freshly blown surface and ends up embedded in the film. The defect only shows after drying, when the part is already finished.
Traces of oil from the line settle on the component before application. The adhesion promoter doesn't bond, the primer pulls back: a part to scrap and a cycle to restart from scratch. On high-volume lines that means hours of lost production.
When powder coating plastics, moisture in the line disrupts the electrostatic charge distribution: powder deposits unevenly, with variable thickness and bare spots. The result: an out-of-tolerance part to redo.
The Evans system advantage
From the small craft workshop to the industrial production line, Evans sizes the treatment to your compressor's flow rate and the type of application: liquid or powder.
Site survey, sizing, installation and testing included.
Request information →Craft painting of components on a bench or in a compact booth. Simple installation on the existing compressor.
Series painting of plastic parts such as housings, panels, automotive or appliance components. Modular system for multiple stations.
Continuous production, several booths or robots in parallel. Centralized system with remote monitoring of flow and air quality.
The Evans system can be interconnected with the finishing line: real-time monitoring of pressure, temperature and dew point, automatic alerts, and data for the Industry 5.0 tax credit.
FAQ
Plastic has low surface energy: it tends to repel liquids rather than absorb them. The adhesion promoter raises that energy before the primer, but it only works if the surface is perfectly clean. Oil, moisture or electrostatically charged dust, all carried by the compressed air, compromise that critical step. With Evans air the substrate reaches the gun in optimal conditions for adhesion.
Yes. Fish-eye on plastic almost always comes from oil contamination in the compressed air. By removing oil and particulate upstream, Evans eliminates the main source of cratering. On plastic substrates fish-eye is especially costly: it almost always means going back to the substrate, not just sanding.
Yes. Powder coating plastic components — with low-cure powders — requires dry, clean air for the electrostatic guns. Moisture or oil in the line disrupts the charge distribution and produces uneven deposition. Evans guarantees the air quality needed for even deposition on every part.
Yes. Evans installs downstream of the existing compressor without changing the main network. Sizing takes into account flow rate and number of stations. Installation typically takes one working day.
Yes. Stable pressure and clean air improve coverage in difficult areas such as corners, ribs and undercuts, where flow variations produce uneven thickness. On parts with complex geometry, constant pressure is decisive for final quality.
Yes. UV coatings on plastic are among the most sensitive to oil: even microscopic traces interfere with curing and leave uncured areas. Evans air — filtered and deionized — removes that variable and ensures uniform curing across the whole part.
