The spray advantage of coating electrostectrectrecture powder friction spray gun on complex parts

Friction gun because of its high powder efficiency, for a variety of color change requirements and small batch production using non-recycling system can also obtain higher economic benefits, production flexibility makes the application manufacturers in the product variety to obtain greater competition.
frictional electrostate gun can take advantage of its good penetration performance (e.g. various aluminum profiles and deep groove work parts) when spraying complex work parts.
use of friction guns needs to be accompanied by a special friction powder to
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. With the continuous improvement of powder production level, more and more powder manufacturers produce spray powder suitable for high-pressure and friction gun applications.
spray powder is usually composed of the following three different sizes of powder particles:
fine particles: 20 microns below
medium grain: 20 to 45 microns
coarse particles: 45 microns above
different size particles produce different frictional static effects is obvious, smaller particles after the friction gun inside the tube, can obtain greater friction effect, and the risk of friction with the pipe wall. As a result, friction charging can be achieved quickly. Medium particle powder is best suited for friction gun spray applications.
advantages of friction
1, can be used a comprehensive automatic spray, saving labor.
2, the surface quality is more perfect and smooth compared to the high-voltage electrostectrective gun.
3, surface coating uniformity is perfect.
4 and overcome the Faraday effect, which is particularly effective for the spraying of complex work parts.
5, the powder rate is high, reducing the investment cost of equipment.
Friction spray for smoother surface mass
Usually friction spray results in a smoother surface quality than high-pressure electrostectural gun spray, because friction spray powder on the work piece will not be due to accumulation of static rejection, overcoming the resulting "orange peel effect." The "orange peel effect" of powder static electricity is usually produced in the following cases:
1, when the powder particles accumulate on the surface of the work piece is too thick, the outer particles can not be fully grounded, mutually exclusive, and continue to spray to the work piece of the powder particles have a repulsion effect, affecting the efficiency of the powder and surface quality. On the surface of the work piece, there may be uneven surface, or even foaming phenomenon.
2, excessive powder may also cause a small gap between the coating film and the surface of the work piece, resulting in an orange peel surface.
3, high voltage static electricity is too high. When the high-pressure static electricity of the acting powder is too high, it also causes the orange peel of the coating surface. This phenomenon can be avoided when the friction gun is sprayed.
4, leveling and curing process is not perfect, the temperature distribution in the curing furnace is not uniform, and the workware heating is not complete. Friction gun spraying note
1, spraying with the first friction gun to spray the spray work piece "initial" to achieve the ground effect of the work piece. This can make the work piece produce a similar "warm-up" effect, improve the efficiency of the powder sprayed on the back.
2, adjust the spray angle of the spray gun and the entry work piece, so that the work piece and the spray powder have as long contact time as possible. Try to maximize the contact time between the sprayed powder and the work piece.
two sets of guns can be used when spraying work parts with deep grooves. The first group of guns sprayed the inside of the deep groove at close range with a high amount of powder, and because the nozzle was close to the work piece, the inside of the deep groove could be sprayed. The second set of spray guns is arranged far away from the work piece and sprayed on the outside of the work piece at a low speed with a small amount of powder.
4, avoid the cross-over of the spray gun, the cross-over of the spray can not improve the spray effect, but will cause spray confusion.