What are the types of spray gun

Summary: spray gun is the use of liquid or compressed air quickly released as a power of a device, the market is very much a variety of spray gun, can be divided into suction on the way the paint supply, gravity spray gun, pressure-fed spray gun these three types, but also in accordance with the way the work is divided into conventional air spray gun, HVLP spray gun, LVMP spray gun, air-assisted airless spray gun, airless spray gun these five types, also Can be categorized according to the use, the next and the editor to take a look at it. What are the types of spray gun

A, according to the paint supply method classification

1, suction type spray gun

Suction type spray gun paint cans are located in the lower part of the gun, the paint nozzle is generally more than the center of the air cap hole protrudes slightly forward, as shown in the figure, the compressed air from the center of the air cap holes, that is, the paint nozzle around the spray, the formation of negative pressure in the paint nozzle at the front end of paint, paint from the paint cans and atomized. Negative pressure is formed at the front of the paint nozzle, and the paint is sucked out of the paint tank and atomized. The amount of paint sprayed from the suction-up gun is more obviously affected by the viscosity and density of the paint, and is closely related to the caliber of the paint nozzle.

2, gravity gun

Gravity gun paint cans are located in the upper part of the gun, the paint by its own gravity and paint nozzles formed in front of the role of negative pressure from the paint nozzle spraying, and mixing with the air atomization. The basic structure of the gun is the same as that of the suction gun, but under the same spraying conditions, the amount of paint sprayed is larger than that of the suction gun.

The gravity gun is used for spraying operations where the amount of paint used is small and color changes are frequent. When the dosage of paint is high, another high level paint tank can be set up and connected to the spray gun with a hose. In this case, the height of the paint tank can be changed to adjust the amount of paint sprayed.

3, pressure-fed gun

Pressure-fed gun is another paint booster tank (or paint pump) supply of paint, increase the pressure of the booster tank can be simultaneously to several guns supply of paint. This spray gun paint nozzle and air cap center hole is located in the same plane, or more than the center hole of the air cap slightly concave inward, in the paint nozzle front does not have to form a negative pressure.

Two, in accordance with the work of classification

1, conventional air spray gun

Traditional air spraying is very simple, is the use of low-flow, high-pressure compressed air at the air cap atomized paint and spraying. This is the most common application process in the wood industry. Conventional air spraying provides optimum atomization and allows for very flexible gun adjustments.

2, HVLP spray gun (low pressure, high flow gun)

In the air cap at the use of high-flow, low-pressure spraying, this method can make the coating has a high transfer efficiency. HVLP technology in North America is very common spraying method. This method works well for spraying into recesses and other areas that are normally more difficult to spray. It also meets all air quality management standards. HVLP's smooth spray pattern also improves transfer efficiency and reduces overspray compared to traditional air spraying techniques.

3, LVMP gun (low pressure, low flow gun)

Combination of conventional air and HVLP spraying technology, the use of low-flow, medium-pressure compressed air outside the air cap to atomize the paint. Compared with conventional air and HVLP spray guns, LVMP spray guns offer better atomization and higher transfer efficiency with less air consumption.

4, air-assisted airless spray gun

This technology uses a high paint pressure (usually less than 70 bar) at the nozzle, supplemented by a small amount of atomizing air to spray. In the wood industry, air-assisted airless spraying has become increasingly popular in recent years. Compared to conventional air spraying, this technology offers paint savings of up to 30%, lower overspray and less atomization. It also enables the formation of a thicker coating film with excellent spraying results.

5, airless spray gun

Airless spraying is widely used in metal, plastic, ceramics, wood and other substrate surfaces due to its high coating efficiency, paint without rebound, environmental protection and other features. Coatings can be paints, water-based coatings, glues, oils, mold release agents, etc. Airless spraying, that is, by the material pressure (high pressure) will be squeezed out of the nozzle, and then according to the shape of the nozzle sprayed out. With airless spraying, paint particles are ejected at a much higher velocity than with conventional air spray guns. This results in a correspondingly higher flow of paint and a more concentrated spray (smaller vortex area).

The spray pattern of airless spraying is determined by the nozzle, and the shape of the spray can only be changed by changing the nozzle. The size and shape of the nozzle determines the shape of the spray, the diameter of the center hole of the airless nozzle determines the flow rate of the paint, and the oval shape and size of the nozzle opening determines the height and width of the spray (elliptical cone). Airless spray gun is especially suitable for spraying a large amount of material per unit of time, compared with the traditional spray gun, airless spray gun produces less aerosol, less waste of material (reference: nozzle to the vertical height of the workpiece 300mm)

Three, according to the use of the classification

1, make-up spray gun

Spray gun technology, the most popular make-up make-up a make-up technology, makeup styling beautiful, used in film and television, shows, etc., belonging to the film and television, show, etc., is the most popular makeup technology. Used in film and television, show, etc., belongs to a creative makeup. Airbrush makeup technology, is through the airbrush on the skin makeup, the process is a bit like the airbrush tanning method, is carried out with a small airbrush, small airbrush through the airflow, better let the cosmetics fit the skin, to create a smooth, even feeling.

2, paint spray gun

Compressed air generated by the air compressor, the air cap through the front of the spray gun when sprayed out, it is connected to the front of the paint nozzle with which a low-pressure area lower than atmospheric pressure. Spray gun fast and easy automation selection has included, in the spray gun mouth of this pressure difference generated by the paint from the paint storage tank sucked out, and in the compressed air under the action of high-speed jet force, atomized into particles sprayed on the surface of the coated object.