Spray painting is a painting technique in which devices spray layers (paint, ink, varnish, etc.) through the air to the surface. The most common type of compressed gas use - usually air - to spray and direct paint particles. The spray guns evolved from the airbrush, and both are usually distinguished by the size and size of the spray pattern they produce. Airbrush is hand-held and used as a brush replacement for detail work such as photo retouching, painting nails or fine art. Air gun spraying uses generally larger equipment. This is usually used to cover large surfaces with a uniform liquid layer. A spray gun can be either automatic or hand-held and has a replaceable head to allow for different spray patterns. Portable aerosol paint cans are portable and easy to store.
Video Spray painting
History
Spray paint with compressed air can be traced back to its use on the Southern Pacific Railway in the early 1880s. In 1887 Joseph Binks, a maintenance supervisor at Grocery Store Marshall Field in Chicago developed a cold-pumped watercolor sprayer to hand to apply chalk to the wall of the store's sub store. Francis Davis Millet, the decorating director for the Columbia World Exposition in Chicago in 1893, used Binks and his spray painting system to apply lime composed of a mixture of oil and lead to buildings at the Exposition, with far less time than traditional painting brushes and set it into what is called the White City. In 1949, Edward Seymour developed a type of spray painting, aerosol paint, which can be sent through a compressed aerosol in a can.
Maps Spray painting
Type
Air gun spraying
This process occurs when paint is applied to an object through the use of a pressurized spray gun. The air gun has nozzle, paint basin, and air compressor. When the trigger is pressed, the paint mixes with compressed air flow and is released with a fine spray.
Due to the various shape and size of the nozzle, the consistency of the paint may vary. The shape of the workpiece and the consistency and the desired paint pattern are important factors when choosing a nozzle. The three most common nozzles are full cones, hollow cones, and flattened streams. There are two types of air-gun spraying process. In the manual operation method the air-gun sprayer is held by a skilled operator, about 6 to 10 inches (15-25 cm) away from the object, and moves back and forth on top of the surface, any scratches that overlap with the previous to ensure continuous mantle. In an automated process, the rifle head is attached to the mounting block and sends a paint stream from that position. The painted object is usually placed on rollers or turntable to ensure a uniform overall coverage of all sides.
High volume low pressure
High volume low pressure (HVLP) is similar to a conventional spray gun using a compressor to supply air, but the spray gun itself requires lower pressure (LP). Higher air volume (HV) is used for aerosols and pushes paint at lower air pressure. The result is a higher proportion of paint reaching the target surface with overspray reduction, material consumption, and air pollution. Regulators are often required so that air pressure from conventional compressors can be lowered for HVLP spray guns. Alternatively, turbine units (generally containing motors originating from vacuum cleaners) can be used to move the air without the need for air ducts that flow into the compressor.
The rule of thumb puts two thirds of the layer on the substrate and one third in the air. A true HVLP rifle uses 8-20 cfm (13.6-34 m 3 /h), and an industrial compressor with at least 5 horsepower (3.7 kW) output is required. HVLP spray systems are used in automotive, decorative, marine, architectural, furniture finishing, landscape painting, and cosmetic industries.
Low volume low pressure
Like HVLP, low pressure low pressure spray guns (LVLP) also operate at lower pressures (LP), but they use low volume (LV) air when compared to conventional equipment and HVLP. This is a further effort to improve the transfer efficiency (the number of layers that end up on the target surface) of the spray gun, while reducing the amount of compressed air consumption.
Electrostatic spray painting
Electrostatic painting was first patented in the US by Harold Ransburg in the late 1940s. Harold Ransburg founded Ransburg Electrostatic Equipment and found that electrostatic spray painting was a direct success as manufacturers quickly perceived substantial material savings that could be achieved. In electrostatic spray painting or powder coating, the atomized particles are made to be electrically charged, thereby repelling each other and spreading itself evenly as it exits the nozzle nozzle. Objects painted are charged opposite or down to earth. Cat is then attracted to an object that provides a flatter layer than wet spray painting, and also greatly increases the percentage of paint attached to the object. This method also means that the paint covers hard-to-reach areas. The whole can then be baked to properly attach the paint: the powder turns into a plastic. Car body panels and bicycle frames are two examples where electrostatic spray painting is often used.
There are three main technologies for filling liquids (liquids or powders):
- Direct charging : Electrodes are immersed in a paint supply reservoir or in a paint supply channel.
- Tribo filling : This uses friction fluid forced through the paint gun barrel. It rubs against the side of the barrel and builds an electrostatic charge.
- Post-atomization filling : The atomized liquids come into contact with the electrostatic field downstream of the outlet. Electrostatic fields can be made by electrostatic induction or corona, or by one or more electrodes (electrode ring, mesh, or grid).
Rotational bell
With this method the paint is thrown into the air by a rotating metal disk ("bell"). The metal disk also imparts an electrical charge to the coating particles.
Electric fan
There are different types of hand paint sprayers that combine paint with air, or turn the paint into small droplets and accelerate out of the nozzle.
Hot spray
By heating the full-bodied paint to 60-80 Â ° C, you can use a thicker layer. Initially the paint was recirculated, but since this led to structuring, the system was turned into direct heating online. Hot spraying is also used with Airless and Electrostatic Airless to reduce bounce back. Two pack materials usually have a premix before the tipping system uses a double pump.
Airless spray gun with air aid
It uses air pressure and fluid pressure of 300 to 3,000 pounds per square inch (2,100-20,700 kPa) to achieve the atomization of the coating. This equipment provides high transfer and speed improvement applications and is most commonly used with flat line applications in finished factory shops.
The fluid pressure is provided by an airless pump, which allows heavier materials to be sprayed than is possible with an airspray gun. The compressed air is put into the spray through an air nozzle (sometimes called an air cap) similar to a standard conventional spray gun. The addition of compressed air improves the smoothness of atomization. Also unlike the pure airless spray gun, the AA gun has control over the fan spray for the spray of the round. Some Wagner and Graco electric filtration sprayers are equipped with a compressor to allow the use of auxiliary air-fired pistols in situations where portability is important.
Non-air spray gun
It operates connected to a commonly used high pressure pump using 300 to 7,500 pounds per square inch (2,100-51,700 kpa) pressure to spray the coating, using different tip sizes to achieve the desired atomization and spray pattern size. This type of system is used by contract painters to paint heavy industrial, chemical and marine coatings, coatings and coatings.
The advantages of airless spray are:
- The coating penetrates better into holes and crevices.
- A uniformly thick layer is produced, reducing the number of layers required.
- A very "wet" coating is applied, ensuring good adhesion and flowing out.
Most coatings can be sprayed with a slight extra thin, thereby reducing the drying time and reducing the release of the solvent to the environment.
Care should be used when operating, since airless spray guns can cause serious injuries, such as injury injuries, due to paint coming out of the nozzle at high pressure.
Airless pumps can be driven by different types of motors: electricity, compressed air (pneumatic) or hydraulic. Most have a paint pump (also called lower) that is a double working piston, where the piston pumps paint both below and at the top. Some airless pumps have a diaphragm instead of a piston, but both types have inlet valves and outlets.
Most airless pumps have electric motors connected through a dental gear to a paint piston pump. Pressure is achieved by stopping and switching the motor through a pressure sensor (also called a transducer); in a more advanced unit, this is done by a digital control where the motor speed varies with demand and the difference from the pressure sets, resulting in excellent pressure control. Some direct drive piston pumps are driven by gasoline engines with pressure control through electric couplings. At the electric diaphragm pump, the motor drives a hydraulic piston pump that transmits the oil removed by the piston, to move the diaphragm.
Air-powered hydraulic-powered pumps have linear motors requiring hydraulic pumps or air compressors, which can be electric or gasoline, although air compressors are usually diesel-powered for cellular or electrical use for fixed installations. Some airless units have hydraulic pumps and their motors, which are built on the same chassis as the paint pump.
Hydraulic or air powered floats provide more uniform pressure control because the piston moves at a constant speed unless it changes direction. In most direct drive piston pumps, the piston is driven by a crankshaft where the piston will continue to change in speed. Linear motors from hydraulic or compressed air drive pumps are more efficient at converting engine power into material power, from crankshaft driven units. All types of paint can be painted using a stuffy method.
Automatic spray system automatic
Manufacturers who produce wood products in bulk use an automatic spraying system, enabling them to paint materials with a very high level with minimum personnel. Automatic spray systems typically incorporate a paint saving system that produces paint that is not applied to the product. Generally, a linear spray system is for a product that lies flat on a conveyor belt and then inserted into a linear spray system, where an automatic spray gun is placed on top. When the material is just below the rifle, the rifle begins to paint the material. Materials consisting of line parts are usually less than 12 inches (30 cm) wide, such as window frames, wood moldings, pedestals, casing, trim, and other materials are simple in design. These machines are usually used to apply stain, sealer, and lacquer. They can apply water-based coatings or solvents. In recent years ultraviolet-healed coatings have become commonplace in the settlement of profiles, and there are machines that are very suitable for this type of coating.
Automatic straight-line spray system
Mass-produced material is loaded on the conveyor belt fed to one of these flat-line machines. Flatline Machines are designed specifically for painting materials that are less than 4 inches (10 cm) thick and complex in shape, such as kitchen cabinet doors or the front of a drawer. The spray gun is aligned on top of the material and the rifle moves to hit all material grooves. The rifle can be moved in circles, circles, or movable to apply the paint evenly throughout the material. The flatline system is usually large and can paint doors, kitchen cabinets, and other plastic or wood products.
booth spray
A spray room is a pressure-controlled closed environment, originally used to paint vehicles in body stores. To ensure ideal working conditions (temperature, airflow, and humidity), this environment is equipped with ventilation, which consists of electrically driven mechanical fans, and optional burners to heat the air to speed up the paint drying. Poisonous solvents and paint particles run out on the outside, possibly after screening and treatment to reduce air pollution. Fire prevention and dust explosion are also top priorities. To assist in the removal of excessively sprayed paint from the air and to provide efficient operation of spray-resistant spray paint spray, use detackifying agent chemical paints.
Artists can also use the spray booth facility to allow them to use spray paint (including automotive finishes) efficiently and securely. They can rent space and time in car body shops, or arrange their own facilities in association with schools or artist cooperatives.
Disabled
- Citrus peel, unwanted undulating texture
- Fish eye, defects caused by contamination such as oil or water
Other apps
One application of spray painting is graffiti. The introduction of cheap and portable aerosol paints has been a boon to this art form, which has spread all over the world. Spray painting has also been used in fine arts. Jules Olitski, Dan Christensen, Peter Reginato, Sir Anthony Caro, and Jean-Michel Basquiat have used airbrush, both for painting and sculpture.
See also
- Aerosol paint
- Airbrush
- Frederick William Lawrence
- Huffing
- Primary (cat)
- Art spray paint (graffiti)
References
More spray paint resources
- "How to Buy a Cat Sprayer and Pay It." Popular Science , September 1966, pp 160-163, an article about home paint sprayers.
- Health Hazards and Safety Precautions Associated with Spray Paints - How to Paint Car Info
Source of the article : Wikipedia
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