1, hanging
Select the appropriate hanging according to the shape of the aluminum profile, choose the right hanging is the key to controlling the coating thickness, it not only improves the quality of the aluminum profile coating, but also reduces the powder room operator with a hand filler gun to make up for the workload of the powder, in particular, the spacing of the hanging material can be adjusted to the thickness of the powder coating. The spacing of the hanging material is generally required: the width of the aluminum profile = the spacing of the aluminum profile.
2, the workpiece and hook contact
Because the workpiece and hook contact (i.e., poor conductivity), will seriously affect the coating efficiency and coating quality, resulting in a low rate of the workpiece on the powder caused by the coating thickness of the phenomenon of low or even the bottom of the phenomenon, and to the recycling system to create a great deal of pressure to the excess of the powder too late to recover the overflow to the powder, both to reduce the powder outside of the room, and to reduce the powder coating thickness. This reduces the utilization rate of the powder and pollutes the environment.
Workpiece contact poorly produced products, in the same material at different points in the measurement of the coating thickness may be 30um-70um difference, some places due to the coating is too thick, there will be orange peel, pinholes, flow marks and other defects, the color and gloss will also be affected, and in the natural light of the visual sand grain powder profiles have a more obvious zebra-like and other defects. Therefore, it is necessary to ensure good electrical conductivity between the workpiece and the hangers.
3, conveyor chain speed and production process
In the production of conveyor chain speed and production process on the thickness of the powder coating coating plays a major role, such as: elevator stroke, gun distance, powder pressure, electrostatic voltage, etc., the height of the elevator stroke is generally required: the stroke height = height of the workpiece +200mm.
Workpiece shape, the workpiece is the same as the workpiece, and the workpiece is the same as the workpiece. p>
The more complex the shape of the workpiece, the closer the distance between the gun and the workpiece, the smaller the amount of powder required, the lower the voltage; conversely, the simpler the shape of the workpiece, the farther the distance between the gun and the workpiece, the larger the amount of powder, the higher the voltage.
4, hand spray gun to make up the powder
Because of the complexity of the shape of the aluminum section, in the production process, as the decorative surface of the inner corners of the horizontal grooves, grooves, etc. is not easy to spray to the place of the automatic spray gun must be a hand spray gun to make up for the spraying when the hand spray gun gun nozzle to the place to be spraying the place of the hand spray gun to be spraying the workpiece, the transfer of the pressure is too large to regulate the distance between the hand gun and workpiece is too close to the workpiece, the hand spray gun and the workpiece. The distance between the hand spray gun and the workpiece is too close, it is easy to cause the surface of the workpiece to produce orange peel, flow marks, pinholes, gunshot point, fat edge and other phenomena.
Generally, the hand gun nozzle is facing the workpiece to be sprayed on the place, the transmission to the pressure: 1.2 ~ 1.8bar, the distance between the hand gun and the workpiece should be controlled in the 80 ~ 150mm.
5, the powder pump factors
In the production process, common uneven powder is mainly the Venturi Powder pump parts are not clean and caused by the powder pump pressure suction tube, easy to produce powder, sticky powder and cause blockage, will lead to powder pipeline reception is affected, thus affecting the thickness of the coating of the workpiece, the powder room operator should be in general timely check the cleanliness of the parts of the Venturi powder pump.