Car Painting Techniques
Car painting is very simple if it is with the spray paint. Every spray paint is made up of three main parts: a compressor to pressurize the paint, a container to hold the material and a spray gun to spray it across the required surface through its nozzle in a fine mist. If compressed spray gun prefers it is very easy to use. On pressing the trigger switch, Ventury effects get formed and the paint combines with the compressed air releases itself in to the surface as a fine mist.
Different spray painting techniques are employed to paint the surface of the cars. All of them use compressed air or fluid or air pressure to discharge and direct the spray. Spray guns are commonly used for spraying cars. Spray guns are mainly of two types, suction fed and gravity fed. Anyone could recognize it as their shape and arrangements are identifiable. In the suction fed spray guns, the paint container is fixed below the air gun and the compressed air is used to attain the desired spread. It also has a delicated air cap to generate low vacuum.
In gravity fed the container is at the top of the gun and the major force acting on the system is gravity though compressed air is used to a lesser extent. Gravity fed spray guns are capable of giving good performance than suction fed guns as it uses less compressed air and has less weight.
Another process is the HVLP high volume low pressure system. The spray guns as far as the compressed air is concerned, the gun works at low pressure. So that the wastage could be minimized to a large extent. A third process uses Low volume low pressure or LVLP system and is an improvement of the HVLP system of painting. Advantage is that wastage is further controlled and the intended surface gets more paint. Both the HVLP and LVLP system need high capacity compressors and may not be ideal for every day use.
In electrostatic spray painting, paint powder is used. When the paint is discharged from the gun it is so arranged that it develops an electrostatic charge and got fixed in the oppositively charged surface.
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