Why treat compressed air
Leather processing (buffing, staking, handling) generates fine dust carrying electrostatic charge. Air that isn't deionized doesn't discharge it: dust sticks to the surface right while the pigment is being sprayed.
Traces of oil in the air line settle on the hide before the finishing coat. The top coat doesn't bond evenly: halos, dull patches, compromised adhesion on the finished product.
Moisture in the air alters the pigment's viscosity at the moment of spraying: the same formula gives a different color from one hide to the next. The result is a batch outside color tolerance, to be reworked or downgraded.
The Evans system advantage
From the sampling lab to the industrial finishing line, Evans sizes the air treatment to the number of guns and their average consumption, so the applied product (pigment, aniline, top coat) performs at its best.
Site survey, sizing, installation and testing included.
Request information →Color development and trials on small batches. Compact installation on the existing compressed air line.
Series spraying on a rotary line or with manual guns. Modular system calibrated to the number of stations.
High-volume production, several spraying lines in parallel. Centralized air quality monitoring.
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
Compressed air is the carrier that atomizes pigments, aniline and top coats as they leave the guns. If it contains moisture, oil or particulate, those contaminants alter how the product performs on the hide: color variation, fish-eye, halos on the top coat. In a tannery, a finishing defect often means downgrading the whole hide or the whole batch.
Moisture in the air alters the pigment's viscosity at the moment of spraying: the same formula gives a different shade from hide to hide. With air at constant humidity, color yield stays the same from the first to the last hide of the batch, reducing scrap from failing to match the sample.
Yes. Evans sizes its machines to the number of guns and the total compressed air flow required, guaranteeing the same air quality at every nozzle, from the first to the last on the rotary line.
Yes. Evans installs close to the finishing equipment without changing the main network. Sizing takes into account the number of guns and the type of product applied — pigmented, aniline or top coat.
For a sampling lab or a compact finishing line, installation and testing take one working day at most. On industrial multi-gun lines, Evans plans the work to minimize production downtime.
Yes. Removing oil and moisture from the air line eliminates the two most common causes of fish-eye and top coat halos. Fewer hides to rework or downgrade means more value recovered from every batch.
