Paint booths – CORAL Engineering, Milano
The choice of which spray booths are the best to buy depends first of all the objects that need to be coated, the manufacturers must be given the information on data sheets of coating products in use.
CORAL Engineering offers a full range of spray booths for the treatment of pollutants which are generated during the coating operations, the choice of the filtration system for the spray booths is either water film spray booths or dry spray booths.
In the case where water-based coatings are used the most suitable type is the dry spray booths, and using water film paint booths with solvent-based paints either polyurethane, nitro or polyester.
In dry spray booths pleated paper and glass fibre filters are used for filtering in order to retain the pollutant, while in wet spray booths the action of a film of water flowing out of a vertical panel and that captures the paint particles is exploited. A further air filtration with rubber coconut fibre filters is then carried out on this kind of booths.
For both versions of spray booths it is possible also to combine to the air intake system an active carbon post- filtration to reduce the solvent odour. Through the centrifugal fan mounted on the roof of the spray booth, a vacuum is created which determines the forced circulation of air flow through the filters. This flow conveys the paint particles suspended in the air to the filters without any dispersion in the air.
The first stage of filtration captures the larger particle size paint pigments, while the second stage made of glass fibre, blocks the finer ones; the air purified from solid pigments is expelled from the centrifugal fan. It is important that extraction systems in spray painting environments are localised both in correspondence of the areas of application of the paint, especially in the case of spray paint both in correspondence of the areas in which the drying of the varnish is carried out, since, particularly in the case of paints that use volatile thinners, the drying process may cause the evaporation of these solvents, consequently the exposure of workers.