It is well known that during the spraying of the Metallic Spray Paint, the powder coating is passed through the air flow to the spray gun after the fluidization of the powder coating. The gun passes through the high voltage electrostatic generator, generates corona discharge at the electrode pin of the nozzle, produces a dense negative charge near the electrode, When ejected, the charge is charged as a charged powder, flying to the grounded workpiece under the action of airflow, electric field and its own gravity, and adsorbed on the surface of the profile. Therefore, in our spraying process, the need to do adequate preventive measures.
1 Metallic Spray Paint coating method
In most cases, the use of electrostatic spray gun for semi-installed, because this type of product contains metal pigments, the use of electrostatic gun construction should ensure that the system is well grounded at the same time set a lower static voltage and powder, to prevent spraying Produce a fire phenomenon. The effect of forming a coating film is greatly related to the setting of the gun, the quality or the brand. After a long period of spraying may have a large number of Metallic Spray Paint accumulation in the gun discharge needle, the need for regular cleaning workers discharge needle.
The gloss of the Metallic Spray Paint coating
In most cases, due to the large error, it is not recommended to use a gloss meter to measure the appearance of the appearance of the coating film, but only use visual comparison method to determine whether the same with the standard model.
3 Metallic Spray Paint coating recyclability
For the powder made by dry mixing method, the separation phenomenon occurs in the process of spraying and recycling, so there will be some difference in the content of the Metallic Spray Paint in the recovered powder and the new powder, which may lead to the inconsistency of the appearance of the coating film. The This is due to the difference in the nature of the metallic pigment and the powder particles. Experts recommend that the ratio of recovered powder to new powder is at least 1: 4. If the powder coating produced by the bond fixing method is used, the recovered powder can be completely reused due to the relatively constant ratio between the metallic pigment and the powder particles.
Analysis of Metallic Spray Paint spraying precautions
4 Metallic Spray Paint coating of the coating layer
The coating of the Metallic Spray Paint coating on the coating layer has the following advantages: to enhance the anti-stone coating performance of Metallic Spray Paint coating; increase the aesthetic effect of Metallic Spray Paint coating; completely solve the metal pigment can be erased; improve the Metallic Spray Paint coating The weatherability. In order to ensure the appearance of the cover layer effect, requiring the first spray of the workpiece can not be any pollution. Therefore, the general need for a fully automated spray line and two separate spray booths were painted. It is recommended not to spray the coating under normal circumstances.
5 metal pigment can be wiped off
Whether it is dry or mixed with a fixed method of making the powder, can not completely solve the problem of metal pigment can be erased. The only way to solve the erasability is to spray a layer of clear coating on the Metallic Spray Paint coating.
6 as far as possible to maintain the stability of the spray conditions. Use the same set of spraying equipment, using the same voltage, air pressure and other parameters; try to keep the gun and the workpiece from the same, as far as possible to maintain the stability of the film thickness; to ensure that the powder coating before spraying has been fully fluidized; use of recycled powder, Powder to the ratio of new powder to less than 1: 4; try to avoid the use of Metallic Spray Paint coating spray type complex or there is a deeper depression of the workpiece; recommended for the assembly together for a number of parts should be sprayed at the same time.