Three atomization technologies for spray guns

(1) Conventional high-pressure atomization method: the spray pressure of a conventional high-pressure spray gun is generally 4.0 bar, and the paint is atomized by the pressure of compressed air. Therefore, the lance pressure of the traditional spray gun must be high enough to have enough energy to atomize the paint, but the high atomization pressure will cause the sprayed material to produce a large flow rate, when the paint flow rate is too fast. When the ground is sprayed on the surface of the workpiece, a certain rebound will occur to form an overspray, which greatly reduces the transfer efficiency of the paint (ie, the paint rate). Its transfer efficiency is generally only about 35%-45%, except that it is unnecessary. Waste is also wasted in the paint.

(2) HVLP high-flow low-pressure atomization method: HVLP (High Volume Low Pressure) high-flow low-pressure spray technology is a modern advanced spraying technology in the coating industry. What is high flow and low pressure? It atomizes the coating with a very low hood atomization pressure (0.7 bar, inlet pressure 2.0 bar), which reduces the coating loss and environmental pollution caused by over-spraying, with a relatively high compressed air flow (approximately gas consumption) 430 liters per minute to replenish energy and complete atomization; HVLP was first proposed in 1988 by the South Coast Air Quality Administration of California, USA, and formulated the relevant 1151 environmental management regulations. At that time, only the air hood at the hood of the spray gun was specified. A spray gun with a pressure lower than 0.7 bar (≤ 0.7 bar) and a paint transfer efficiency higher than 65%, that is, a HVLP spray gun can be used in the area. The HVLP environmentally friendly paint series spray gun features a saving of paint (actually saving 15-30% of the paint compared to conventional spray guns) and reducing pollution. However, its air consumption of about 430 liters per minute is slightly higher than that of a conventional spray gun, so it needs to be stronger. A stable compressed air supply system and a slightly different spray method than conventional spray guns.

(3) RP low flow medium pressure atomization mode: RP (Reduced = reduced; Pressure = hood pressure) paint efficient series of spray guns is the most advanced atomization technology, it combines the advantages of traditional spray guns and HVLP spray guns, The hood air pressure is between 1.2-1.3 bar; the paint transfer efficiency is above 65%, but the air consumption is lower than the traditional spray gun (295 liters per minute, inlet pressure 2.5 bar), and the operation is very close to the traditional spray.

HVLP environmentally friendly paint spray gun and RP paint efficient spray gun have a common feature, that is, the atomization pressure is lower, the transfer efficiency of the paint is higher than 65%, and there is a common feature in the nozzle structure, that is, they are all adopted. One of the most advanced designs of today, the air spoiler design, ensures that the atomizing air is evenly ejected from the inside of the hood. When the atomizing air is equalized, the atomized coating is very uniform, and thus The coating color is guaranteed to be evenly sprayed.

Because the paint transfer efficiency of RP paint efficient spray gun is very close to that of HVLP spray gun, HVLP spray gun can only be used in the United States. However, since last year, RP paint efficient spray gun has been approved and approved by more than 20 regions in the United States.

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Label: Three atomization techniques for spray guns

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