Why treat compressed air
Moisture in the air alters the glaze's viscosity at the moment of spraying: the same formula produces a different shade from piece to piece after firing. The result is a batch outside shade tolerance, to be scrapped or reworked.
Traces of oil in the air line mix with the atomized glaze. The resulting micro-bubbles stay trapped in the raw film and become visible holes (pinholing) after firing — a defect that only shows once the kiln has cooled, when the piece is already lost.
Glazing sanitaryware requires a continuous pass over curved, complex surfaces. A pressure drop halfway through leaves areas of different thickness, visible as halos or dull patches after firing.
The Evans system advantage
From the sampling lab to the industrial glazing line, Evans sizes the air treatment to the number of guns, the type of piece — sanitaryware, tiles, third firing — and the compressed air demand.
Site survey, sizing, installation and testing included.
Request information →Glaze development and color trials on small batches. Compact installation on the existing compressed air line.
Series spraying of sanitaryware or tiles. 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 glazing 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 the glaze in the spray guns. If it contains moisture, oil or particulate, those contaminants alter how the glaze performs on the piece: shade variation, pinholing, craters. In glazing, a defect often only shows after firing, when the piece is already lost.
Yes. One of the most common causes of pinholing is oil in the air line, which creates micro-bubbles in the atomized glaze. Those bubbles stay trapped in the raw film and become visible holes after firing. By removing oil and particulate upstream, Evans reduces the risk of pinholing from the very first pass.
Moisture in the air alters the glaze's viscosity at the moment of spraying: the same formula produces a different shade from piece to piece after firing. With air at constant humidity, the shade stays the same from the first to the last piece of the batch.
Yes. Evans sizes the treatment to the number of guns and the total flow of the line, guaranteeing the same air quality at every nozzle, even on multi-station robotic lines.
Yes. Evans installs close to the spray stations without changing the main network. Sizing takes into account the number of guns and the type of piece — sanitaryware, tiles or decorative third firing.
For a sampling lab or a compact glazing line, installation and testing normally take one working day. On industrial multi-gun lines, Evans plans the work to minimize production downtime.
