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About Spray Guns and Applicators
Spray guns and applicators form a coating by directing atomized paints, adhesives, liquids or powders toward a surface. Atomization (wet spray) is a coating process using wet spray paint or fluid coating media where a spray gun directs a coating or paint aerosol toward the part's surface. The paint or coating aerosol is formed using a rotary (spinning disc or bell) atomizer, an ultrasonic atomizer or by forcing the media through a nozzle with pressure. Ultrasonic atomization processes use a transducer vibrating at ultrasonic frequencies to form a fine aerosol or mist of the coating material. Spray guns and applicators are also used in electrostatic powder coating systems, fluidized bed systems.
Spray guns and applicators are used with both air and airless processes. Air spray guns atomize paint with compressed air. Forcing the paint particles into a high velocity air stream atomizes the particles into tiny droplets. The shape and paint density of the resulting droplet cloud can be controlled by air pressure, paint viscosity, and gun tip geometry. Air-assisted spray guns alter the paint pattern, but do not atomize the paint. Airless paint spraying uses high fluid pressure to atomize paint by forcing it through a small orifice. Because less air is used, airless paint spraying poses fewer dry spray and paint bounce-back problems than air-assisted spraying.
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Rotary Spray Guns
Rotary spray guns or applicators use a rapidly spinning cup/bell or flat disc to project powders or atomize paint. rotary cup or bell rotary applicators produce a fan pattern, which is closer to a...(read more)
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