Air spraying technology air spraying is a finishing method that uses the principle of compressed air to spray through the air nozzle of the spray gun, forms a conical vacuum negative pressure zone in front of the nozzle, and sucks out and atomizes the coating under the action of air flow, so as to form a complete coating. This air spraying method has a long history, and now it has developed into a variety of spraying operation methods. 1. Traditional air spraying technology: This spraying operation requires an air supply pressure of 0.3-0.6mpa. The atomization pressure is 0.25MPa. This high atomization pressure has good atomization effect on the coating, good coating quality, low equipment cost, simple and convenient operation, and has a wide range of adaptability to the coating and coating objects.
High Pressure Airless Spraying Technology, that is, high flow and low pressure spraying technology, which 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.
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