Precautions for the application of metal powder coatings

1 metal powder coating coating method
in most cases is the use of electrostatic spray gun for half-packing, because this type of product contains metal pigments, in the use of electrostatic gun construction should ensure a good grounding of the system, while setting a lower static voltage and powder, to prevent the spray when the fire phenomenonThe effect of forming the film has a lot to do with the setting, quality or brand of the spray gunAfter a long time of spraying, there may be a large amount of metal powder accumulated in the spray gun discharge needle, the need for the construction person to regularly clean the discharge needle2 metal powder coating glossin most cases, due to the error is very large, it is not recommended to use gloss instrument to measure the appearance of the metal coating gloss, but only the use of visual comparison method to determine whether it is consistent with the standard model3 metal powder coating recyclability
for powders manufactured by dry mixing method, due to the separation phenomenon in the process of spraying and recycling, so there will be some differences in the content of the recovery powder and new powder in the metal pigment, which may lead to inconsistent appearance of the coating film, color-biased phenomenonThis is due to the difference in properties between metallic pigments and powder particlesExperts recommend that the ratio of recycled powder to new powder be at least 1:4If a powder coating is used by bonding fixation, the recovered powder can be reused due to the relatively fixed ratio between the metallic pigment and the powder particles4 metal powder coating cover light layeron the metal powder coating coating and then spray the cover light layer has the following advantages: enhance the anti-stone strike performance of the metal powder coating film; In order to ensure the appearance of the cover layer, it is required that the first sprayed workpiece should not be subject to any contaminationTherefore, there is generally a need for a fully automated spray line and two separate spray rooms for respective coatingIt is generally recommended that you do not spray the hood light layerUse only when very demanding, such as high-end appliances, car wheels, and outdoor use (to ensure weather resistance)5 metallic pigments can not be wipable
whether it is made by dry mixing or bonding fixation method, can not completely solve the metal pigment can not be wipable problem The only way to address the rewritability is to apply a transparent coating to the metal powder coating 6 to maintain the appearance of metal powder coating scant approach
6.1 for the same product, try to use the same batch of metal powder coating, to avoid the powder coating batch difference 6.2 try to maintain the stability of the spray conditions Use the same set of spray equipment, use the same voltage, air pressure and other parameters, try to keep the distance between the spray gun and the workpiece, as far as possible to maintain the stability of the film thickness, to ensure that the powder coating before spraying has been fully flowed, the use of recycled powder should ensure that the ratio of the recovery powder to the new powder to less than 1:4, try to avoid the use of metal coating powder spray-type complex or the presence of deep depression of the workpiece, it is recommended to be assembled together at the same time