In the last article, we talked about air spraying technology and high-pressure airless spraying technology. Let's review the high flow and low pressure spraying technology first. High flow and low pressure spraying technology can reduce the rebound and overspray of coating by reducing the atomization pressure of spray gun, so as to improve the low transmission efficiency of ordinary air spraying. The power source is not the pressure of compressed air, but the flow, and the pressure is only 0.2MPa, and the atomization pressure at the hood is less than 0.07MPa. Therefore, the spraying speed is greatly reduced, reducing the rebound and waste of coating, so the transmission efficiency can reach more than 65%. However, it also has its defects, because its HVLP atomization pressure is low, it can only be suitable for coatings with low viscosity, and the production efficiency is relatively low.
Let's take a look at the characteristics of lvmp spraying technology. Lvmp spraying technology combines the advantages and disadvantages of traditional spray gun and HVLP. Through the unique air cap and gun body structure design, the atomization effect of the coating is better than HVLP, the transmission efficiency of the coating can reach more than 72%, and the adaptability to the viscosity of the coating is also very good.
High pressure airless spraying technology, high pressure airless spraying technology, uses high pressure pump to apply 7.5-30Mpa high pressure to the coating, so that it can spew through the olive type nozzle. Then it will crack into a very fine spray. At the same time, the paint speed will drop to about 1.2/s. This pressure difference will make the paint atomized into fine particles to spray onto the furniture surface, forming a uniform fine film. This kind of technology is especially suitable for coatings with high viscosity or high solid mass, with high production efficiency and less environmental pollution. However, because of its general atomization effect, the paint output can only be controlled by the nozzle, which is difficult to adjust at will, and the coating flow is large, so it is not suitable for coating small-area workpieces or thin-layer coatings.
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