1. Coating method of metal powder coating

     In most cases, the electrostatic spray gun is used for painting. Because this type of product contains metallic pigments, it should be ensured that the system is well grounded when using the electrostatic gun. Set a lower electrostatic voltage and powder output to prevent the attack. Fire phenomenon. The role of the coating film has a great relationship with the setting, quality or brand of the spray gun. After long-term spraying, there may be a lot of metal powder accumulated in the discharge needle of the spray gun, and the constructor is required to regularly arrange the discharge needle.

2, the gloss of metal powder coating

    In most cases, because of the large error, it is not recommended to use a gloss meter to measure the gloss of the metal appearance coating film, and only the visual comparison method is used to determine whether it is the same as the specification template.

3. Recoverability of metal powder coatings

     Regarding the powder prepared by the dry mixing method, since the separation phenomenon occurs during the spraying and recycling process, the recycled powder and the new powder may have different contents in the metallic pigment content, which may cause the coating film to have a different appearance and exhibit a color cast phenomenon. . This is because of the difference in properties between the metallic pigment and the powder particles. Experts claim that the ratio of recycled powder to new powder is at least 1:4. If a powder coating made by a bonding method is used, since the ratio between the metallic pigment and the powder particles is relatively fixed, the powder can be completely recovered from the beginning.

 4, the cover layer of metal powder coating

      Spraying the cover layer on the metal powder coating film has the following advantages: enhancing the stone-resistant function of the metal powder coating film; adding the beautiful effect of the metal powder coating film; thoroughly treating the wiping property of the metal pigment; improving the metal powder coating film Weather resistance. In order to ensure the appearance of the glazing layer, it is required that the workpiece that is sprayed for the first time is not subject to any contamination. Therefore, there is a general need for a fully automated spray line and two separate spray booths for separate coating. It is recommended that you do not spray the cover layer under normal circumstances. Use only when the requirements are very high, such as: advanced appliances, car wheels and field use (to ensure weather resistance).

5, the erasability of metallic pigments

      Whether it is a dry-mixing method or a powder prepared by a bonding method, the problem of the wiping off property of the metallic pigment cannot be completely dealt with. The only way to handle the wipeability is to apply a clear coat of paint to the metal powder coating.

6, adhere to the common method of metal powder coating appearance

6.1 Regarding the same product, try to use the same batch of metal powder coating to prevent the problem of poor batch powder coating.

 6.2 Try to maintain the stability of the spraying conditions. Use the same set of spraying equipment, use the same voltage, air pressure and other parameters; try to adhere to the distance between the spray gun and the workpiece, try to adhere to the stability of the film thickness; ensure that the powder coating is fully fluidized before spraying; when using recycled powder, make sure The ratio of recycled powder to new powder is at least 1:4; try to prevent the use of metal powder coating to spray the pattern or the deep trapped workpiece; it is claimed that multiple workpieces to be assembled together should be sprayed together.