Spray Painting Equipment (Paint Sprayers) Information
Spray painting equipment refers to the collection of devices used to apply a surface coating to objects by the means of atomized liquids that are propelled through the air, usually by compressed air. It also refers to a series of devices used to optimize the coating application.
Spray Painting Process
A paint, stain, ink, varnish, lacquer, or polyurethane is pressurized and forced into droplets or aerosol by a high-velocity airstream that also serves to distribute the coating on a surface. The spray is patterned onto the workpiece by an applicator, and cleaning and curing equipment helps perfect the paint's adhesion.
The following components are utilized in commercial and industrial painting applications.
A nozzle, gun, or wand utilizes the Venturi effect to coat a surface. The tools are meant to be handheld or used in an automated paint spraying system. These dictate the pattern, droplet size, angle, and intensity of the spray. Some spray systems support multiple applicators. |
Image credit: Wikipedia |
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Power source |
A powered paint sprayer is supplied by either a gas-powered or electric motor, whose operational strength is rated in horsepower. |
Image credit: Northern Tool |
Pressure source |
An air compressor or pump feeds the surface coating through the painting system. This contributes to the flow rate of the paint and pressure is represented in PSI. Turbines are also commonplace. |
Image credit: Paint Sprayer Plus |
Media |
A variety of surface finishing liquids can be applied by a spray system, though latex or oil-based paint is most common. Other agents may require thinning to be used in spray systems. |
Image credit: Home Depot |
The system's integrated basin for paint awaiting application. These range in size from small cups to paint drums. |
Image credit: Lowes |
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Handling equipment |
Large, heavy-duty paint spraying systems, or systems meant to paint outdoor terrain, often require a truck or cart for transportation or operation. |
Image credit: Home Depot |
Application enclosures |
Since between 20 to 40 percent of the spray can be lost due to overspray and droplet drift, spray booths keep wayward particles within an enclosure. These range in size from cabinets to garage-like environments to accommodate a variety of components. |
Image credit: Auto Spray Booths |
Ventilation equipment |
Due to the airborne concentration of minuscule paint droplets, respirators and ventilation equipment are often legally-required components in the spray painting process. Spray booths often incorporate a blower or overhead hood. |
Image credit: EPA
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Electrode |
An electrode is immersed in the reservoir, attached to the applicator, or used to create an electrostatic field. This charges the paint, and the component to be sprayed is oppositely charged or grounded. The paint is attracted to the component to greatly increase coating efficiency. |
Image credit: Cascoat |
Curing units |
Convection and infrared ovens are used to expedite the drying process of certain paints and surface coatings. |
Image credit: Infrared Heating |
Spinning bell/disc |
A spinning bell or disc is used to atomize and electrically charge the paint particles via centrifugal forces. An airstream directs the paint towards the part, which has been charged or grounded. |
Image credit: IFR |
Part feeder |
In high volume spray applications it can be beneficial to have a conveyor or part placement system to assist in moving unfinished and finished components between processes. |
Image credit: Fanuc Robotics |
Atomizing Technology
Generally speaking, there are four methods utilized to produce droplet-sized particles and impart direction upon the spray agent. This technology in conjunction with the applicator determines if the spray pattern and intensity.
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Airless: Paint spraying or application system using high fluid pressure to atomize paint by forcing it through a small orifice. Paint under high pressure is passed through a nozzle and broken down into droplets, or "atomized," where it enters the lower pressure region outside the gun tip. (Less air is used than in conventional air spraying so that the problems of dry spray and paint bounce-back is reduced.)
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Airless (air-assisted): Air-assisted airless spray process is used to alter the spray fan shape pattern, but not to atomize the paint.
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Air atomized: Paint application system wherein paint is atomized by combination with compressed air. System of applying paint in the form of tiny droplets in air, i.e., paint is broken down into droplets, or "atomized," by a spray gun as a result of being forced into a high velocity air stream. Shape and paint density of the resulting droplet cloud can be controlled by air pressure, paint viscosity, and gun tip geometry.
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Rotary cup/disc: 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 nozzle spray gun. A rotating head is shaped to deliver paint forward in a circular pattern. The bell may be directed at any angle and be moved on robots or reciprocators, just as nozzle spray guns are. Disc rotary applicators spin the coating media out radially. Rotating heads that deliver paint horizontally 360° around the head are useful on omega loop conveyor finishing lines. A disk is usually mounted horizontally on a vertical reciprocator. Disc rotary spray guns are also useful for internal or ID coating applications.
In an effort to reduce energy and material consumption, many spray painting operations systems utilize high volume, low pressure (HVLP) or low volume, low pressure (LVLP) systems to spray coat items with large surface areas. These spray techniques are often driven by turbines, not compressors.
Video credit: Canadian Home Workshop via YouTube / CC BY 3.0
Common Spray Painting Systems
Aerosol Can Image credit: eNotes
A can is filled with the spray media before it is filled with compressed hydrofluorocarbons. The can is crimped and tapped, and when the user depresses the nozzle the propellant/paint mixture is forced through the applicator. The paint repels away from itself once it disperses from the nozzle, resulting in a fine, even mist. Plug-in wands and guns are available for aerosol cans. |
Handheld, refillable Image credit: Home Depot
Marketed towards DIYers and low-level commercial applications, integrating a pressure source, reservoir, and applicator into a lightweight footprint that is easily managed. Battery-powered variants offer the most flexibility for unusual locations.
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Handtruck mounted Image credit: Grainger
Spray painting systems where major components such as the motor, compressor, and reservoir are located on a wheeled cart or truck are intended for large-scale painting applications. These systems can be transported to job sites, but the operator must stay within the tethered range of painting system.
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Spraying bays Image credit: Royal Auto Service
Spraying systems in bays and booths are permanent fixtures that can only be operated within the enclosure. The applicator would be hose-tethered to the reservoir, motor, and compressor. These systems often integrate ventilation and dust collection systems as well. |
Line marking equipment Image credit: Clubline Football
Painted lines appear on athletic fields and construction sites by the use of spray systems with ground-facing nozzles. The operator accompanies the system, applying the spray pattern to the terrain. It is used to mark boundaries and points of interest. |
Vehicle mounted Image credit: Sherrill Tree
Spray painting systems may be mounted on a service truck for unique applications. Lines on roadways are applied via trucks with integral line-marking applicators. |
Spray Painting Safety
There are inherent risks to applying paints via spray systems. Air-suspended particles and paint fumes present an inhalation risk, and skin contact should be avoided. Latex-based coatings, which are water soluble, are the easiest to clean and have minimal vapor. Ventilation systems, respirators, and coveralls are recommended where applicable, and in many jurisdictions are legally required in indoor or confined application areas.
- OSHA regulations on spray booth ventilation (external link)
- OSHA regulations on respirator usage (external link)
Standards
A-A-50310 -- Heavy duty spray paint gun
A-A-59564 -- Spray paint fluid containers
BS EN 28028 -- Hose assemblies for airless paint sprayers
SAA AS/NZS 4114.1 -- Construction, testing of spray paint booths
ANSI Z9.3 -- Design of spray ventilation systems
BS EN 50059 -- Electrostatic, handheld spray painting
Resources
Grainger - Paints Sprayers and Accessories
Facilities Net - A Closer Look at Paint-Spray Technology
Wikipedia - Spray painting; Rotational bell painting
Images credits:
Airflow Systems | Grainger | Harbor Freight
- Air / Pneumatic
- Air Spray (Air Atomized)
- Air-assisted Airless
- Airless
- Applicator / Gun
- Automatic
- Booth - Spray Room
- Cart / Handtruck
- Color Change
- Component / Sub-system
- Dust Collection / Air Filtration System
- Electric
- Electrostatic Spray
- Feeding / Metering Unit
- Floor / Skid
- Gravity Feed
- HVLP
- Handheld
- Integral Agitator
- Integral Heater
- Integral Regulator
- Machine / Reciprocator
- Manual
- Mini-spray / Airbrush
- None - Manual
- Outfit / Complete System
- Plastic
- Plural Components / Catalyst Injector
- Pressure Tank / Pot
- Pressure Feed
- Pump / Compressor
- Reciprocator / Robotic Arm
- Spray / Atomization (Wet)
- Spray Cup
- Stainless Steel
- Steel / Aluminum
- Suction Feed (Venturi / Siphon)
- Paint Mixing Room
- binks airless sprayer
- hammertone paint
- harbil paint equipment
- ESD dust cap
- melamine wood finish
- paint dip tank
- mini radiac
- now spray paint MSDS
- walking floor feeder
- airless spray nozzle
- fiberglass spray equipment
- gd2o3 paint
- Rotary Atomizer Spray Station
- cold spray equipment
- electrodag painting
- flame spray equipment
- goot pot 22c
- metal spray equipment
- mounting micromax sprayer
- paint gun reciprocator
- paint stripe applicator
- popcorn spray machine
- sumake airbrush
- wrinkle paint supplier
- Tribostatic Coating System
- accuspray paint guns
- agitator paint guns
- air plasma spray equipment
- airless spray equipment