Abstract: What are the types of spray guns? The types of spray guns are divided into conventional air spray guns, HVLP spray guns (low pressure and high flow spray guns), LVMP spray guns (medium pressure low flow spray guns), air assisted airless spray guns, airless spray guns, electrostatic spray guns (internal high pressure, external high pressure), and other specialties. Spray gun, etc. [Types of Spray Guns] Classification and Characteristics of Spray Guns Which types of spray guns are there? 1 , conventional air spray gun Conventional air spraying is very simple, using a low-flow, high-pressure compressed air atomized coating at the air cap for spraying. This is the most common spray application process in the wood industry. Advantages: Traditional air spray can bring the best atomization effect, and the adjustment of the spray gun can be very flexible. 2 , HVLP spray gun (low pressure high flow spray gun) High-flow, low-pressure spraying at the air cap provides high transfer efficiency. HVLP technology is a very common method of spraying in North America. Advantages: This method can be well sprayed into places such as depressions where it is difficult to spray. It also meets all air quality management standards. Compared to conventional air spray technology, HVLP's smooth spray width also improves transfer efficiency and effectively reduces overspray. 3 , LVMP spray gun (medium pressure low flow spray gun) In combination with a conventional air and HVLP spray technique, low flow, medium pressure compressed air is used outside the air cap to atomize the coating. Compared to conventional air guns and HVLP guns, LVMP guns have better atomization and higher transfer efficiency with less air consumption. The difference in transmission efficiency between a common air lance and an LVMP lance is due to the difference in the flow rate of the atomizing air. At the moment when the atomizing air rushes out of the air cap, the airflow speed of both is near the sound speed range. However, when the rushing distance reaches about 200 mm, a big difference occurs. Therefore, if the airflow speed is low at 200 mm, the transmission efficiency is high. LVMP is a popular coating method in Europe and Asia in recent years. Advantages: fine atomization, high transmission efficiency and low gas consumption. 4 , air-assisted airless spray gun This technique uses a higher coating pressure (usually below 70 bar) at the nozzle and is sprayed with a small amount of atomizing air. In the wood industry, air-assisted airless spray technology has become increasingly popular in recent years. Advantages: This technology saves 30% of paint compared to conventional air spray, with lower overspray and less atomization. At the same time, a thicker coating film can be formed, and the spraying effect is excellent. 5 , airless spray gun Airless spray is widely used for the spraying of metal, plastic, ceramic, wood and other substrates due to its high coating efficiency, no rebound of coatings and environmental protection. The paint can be airless spray of paint, water-based paint, glue, oil, mold release agent, etc., that is, the material is pressed out of the nozzle by the material pressure (high pressure), and then sprayed out according to the shape of the nozzle. Under airless spray, the spray speed of the paint particles is much higher than that of a conventional air spray gun. In this way, the flow rate of the paint is also relatively high, and the injection is concentrated (the vortex area is small). The spray width of the airless spray 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 intermediate hole of the airless nozzle determines the flow rate of the paint. The elliptical shape and size of the nozzle opening determine the height and width of the spray (elliptical cone). Advantages: The airless spray gun is especially suitable for spraying with a large amount of material per unit time. Compared with the conventional spray gun, the airless spray gun produces less aerosol and less material waste (reference: the vertical height of the nozzle to the workpiece is 300mm) 6 , electrostatic spray gun (internal high pressure, external high pressure) 7 , other special spray guns (1) Principle of atomization: air spraying generally uses 0.3Mpa-0.6Mpa compressed air working pressure, and high flow rate flows through the air nozzle of the spray gun to form a partial vacuum around the nozzle. The paint is sucked into the vacuum space by the compressed air. Atomized into fine droplets, coated on the surface of the coated part to form a continuous coating film. (2) Features and applications: The main features of air spraying are simple structure, convenient operation and easy color change. The size of the fan-shaped surface can be adjusted according to the geometry of the workpiece to be coated, and the atomization effect is good. However, the air spray paint mist is easy to rebound and scatter, polluting the operating environment, and the paint utilization rate is only 25%-35%. The air sprayed paint is mixed with the compressed air. The dust source must be installed with dust, oil and water filter device to clean the compressed air to ensure the quality of the film. Air sprayed air source has a low working pressure, and it is difficult to atomize high-viscosity coatings. It is generally suitable for the spraying of decorative low-viscosity coatings. In today's coating industry, the most used air spray guns, especially for products with high film quality requirements, such as high-class cars, high-end furniture, etc., are air sprayed or air electrostatic spray. Editor in charge: Zhao Hongli Clean Room Class,Iso 7 Cleanroom,Class 8 Clean Room,Iso Cleanroom Classes Dongguan V1 Environmental Technology Co., Ltd. , https://www.v1airpurifier.com