| The gun is the most important tool for the painter, in order
to obtain a perfect-quality painting. With the help of compressed
air, the mixed enamel is applied over the surface. Compressed air
and enamel pass through the gun via separate channels. The exit point
of air and enamel is called the „hot point“. |
| Regulation of the paint gun |
| The amount of material is determined by the alteration in
the length of the enamel needle. Regulation is checked with a sample
of paint on cardboard or plate, at an appropriate distance. |
| With the air passage regulation wheel the work pressure is
chosen depending on the material and technical determinations. In
addition, it is through the regulation wheel that the form of the
spray cone is chosen. A spray cone as a high concentration of enamel,
and a small concentration of enamel. The compressed air pressure is
also determined by the size of the drops. |
| High pressure = small paint drops |
| Low pressure = large paint drops |
| With the spray regulation it is possible to continuously regulate
the round spray to plain spray. In the round spray, the air leaves
from the central hole in the air cap. The air channels in the air
cap are closed by the regulation screw, so that a conical enamel spray
occurs. In the plain spray, the air channels of the bit holes of the
horn are released by the opening of the regulation screw. The spray
in the form of a cone may now be conformed in the form of an ellipse
until the plain spray. By additionally turning the air cap, the spray
may come out either vertically or horizontally.+ |
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| Prior to painting, check if the baffle is appropriate for the
enamel to be used: heavy stuffing materials need a large opening of
the baffle, the less viscous materials need smaller baffle openings.
As a matter of principle, a complete set of baffles must always be
replaced |
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| After regulating the gun, the application of enamel is carried
out. The distance to the part to be painted must always be equal. |
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| The types of spray guns are classified per high and low pressure
guns. |
| High pressure guns have the disadvantage of high consumption
of energy and material. However, up to now they are the most commonly
used ones. The pressure required by them is between 1 - 6 bar. In
this case, baffles of sizes 1 -2,2mm may be used. For 1 l of enamel,
an amount of compressed air of approximately 400 l is required. An
oil purger and a water purger are also absolutely necessary. The high
air pressure and the large amount of air necessary cause a strong
paint cloud. The consequence is that the efficiency of the application
is only approximately 35%. |
| These are increasingly getting acceptance. They have the advantage
of forming a reduced cloud and so the performance rate of the application
of enamel is 65 %. The necessary pressure is between 1 - 5 bar. In
this case, baffles of sizes 1 -2,2mm may be used. Approximately 300
l of compressed air are for 1 l of enamel. |
| Several types of spray guns are offered, all designed for
specific types of work. They must meet the following criteria: |
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| Good ergonomics and handling |
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| Tireless work and with little physical effort |
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