Airless spraying in spraying equipment uses booster pumps such as plunger pumps and diaphragm pumps, which can pressurize the liquid paint, and then transfer it to the airless spray gun through a high-pressure hose, using an airless nozzle. The hydraulic pressure is released, so that the instantaneous mist will spray on the surface of the object to be coated, thus forming a coating layer. Because the paint does not contain air, it is called airless spraying.
At present, the most popular method in China is the use of high-pressure airless spraying. The working principle of high-pressure airless spraying is to pressurize the paint to 210 kg/cm², and then atomize the paint into fine particles through a nozzle, which will be directly sprayed on the surface of the object. High-pressure airless spraying is now used in the construction industry in some countries It has been widely used, and it has the following characteristics:
1. Surface quality is to spray the paint into fine particles evenly distributed on the surface of the wall, so that the latex paint forms a smooth, smooth and dense coating on the wall. This is incomparable with the original methods such as brushing and rolling. of.
2. Satisfactory construction effect Its spraying efficiency is as high as 300-500 square meters/hour, saving manpower and man-hours, and can accurately calculate the completion date.
3. Improve paint adhesion and extend coating life. It uses high-pressure spray atomization to make the paint particles obtain strong kinetic energy. The paint particles use this kinetic energy to shoot into the pores, thereby making the coating denser and increasing the mechanical engagement with the wall. The adhesion is improved, effectively extending the life of the coating.
4. Save paint. The thickness of manual brushing is extremely uneven, generally between 30 and 200 microns, and the thickness of latex paint is generally 30 microns (GB), so the effective utilization rate of manual brushing is low, and more importantly, the brush marks are affected. The surface quality and feel are high-pressure airless spraying technology, the coating thickness is uniform, the effective utilization rate is high, and the paint can be saved by 15%~25% compared with other coating methods.
5. A wide range of applicable coatings can spray higher viscosity coatings without excessive water addition. Especially good at the construction of high-grade interior wall coatings. Such as: all kinds of high-gloss, medium-gloss, eggshell, mercerized, matte, "three-in-one", "five-in-one" and other high- and mid-range paints.
The working principle of the airless sprayer is very simple. It uses a high-pressure plunger pump to continuously deliver paint into the closed paint pipeline to form high pressure in the enclosed space, and then release the spray gun trigger connected to the end of the paint pipe to force the high-pressure paint flow The atomization is formed through a very small, professionally processed nozzle, so as to reach the surface of the coated object.
