How to control the powder coating construction aluminum coating defects?
ã€China Aluminum Industry Net】 The electrostatic powder coating technology for building aluminum is a surface treatment technology that has been rapidly developed recently. It is characterized by the fact that the powder can be recycled, does not contain solvents, does not pollute the environment, is easy to realize automated manufacturing, and is easy to use. The coating can be applied. Satisfy different weathering performance requirements, diversified colors. Some defects often appear in the electrostatic powder coating of aluminum profiles, which leads to poor appearance quality and performance of the products. The following are several common coating defect factors and control measures: Defect name: particle Cause analysis: The surface of the substrate has burrs, aluminum chips and graphite marks, and the pretreatment is poor; the pretreatment tank liquid residue adheres to the surface of the profile, and the water washing is not completely in place; the chromizing material is placed for a long time before the coating and the surface is adsorbed. Dust; Improper use of new burning racks leads to ash falling on the surface of the chromizing material; powders and recycled powders may contain impurities; spraying sites and curing ovens are unclean and have suspended matters. Control measures: Polish the surface of the blank before the upper row or sandblasting to ensure that the pre-treatment is in place; periodically invert the trough, clean the residue, and extend the time of pure water washing; chrome material is discharged after the row is blown carefully; the new burning hanger is sprayed with a layer of spray After the thin coating is used, the recycled powder should be used after sieving. The workshop is to be managed by 6S, and the spraying site should be kept clean, and the curing oven should be regularly cleaned. Defect name: exposed bottom Cause analysis: poor coverage of powder coatings; complicated cross-section structure of the material is likely to cause static shielding effect; improper way of hanging materials; poor responsibility of spray room workers, poor business capability, improper judgment of powder film thickness, and excessive powder coating Many, blockage; spray gun moving too fast or chain speed too fast; profile decoration surface is not clear. Control measures: Strictly control the quality of powder coating; Manually fill up the profile grooves and inside corners; Adjust the angle of hanging materials; Improve the skills of spray room workers, measure the film thickness of the cured profile as far as possible before the spray room time, and regularly clean the spray gun mouth. Keep patency; adjust spray gun movement speed, reduce chain speed appropriately; understand customer spraying requirements and recognize the decorative surface of profiles. Defect name: noise Cause analysis: When the spray booth worker cleans the spray booth with color change, the cleaning is not thorough enough and the powder causes noise; the powder (recovery powder) is not used in time to bake the plate, and the color is corrected; the surrounding environment of the spray booth is not clean. Control measures: spray room workers in the cleaning spray room, we must carefully clean up every detail, in particular spray gun powder tube thoroughly clean, large cyclones should be carefully blow clean, clean spray room before baking the baking sheet to confirm whether there is noise; Recycling powder must be used after the baking plate is confirmed, keeping the spray room clean and sanitary at all times. Defect name: uneven coating Cause analysis: The hanging way and arrangement of the chromizing material are not proper; the aluminum material is badly grounded (individual hangers have poor conductivity); the conveying chain speed is not uniform, or the chain speed is not coordinated with the lifting speed of the spray gun; the powder coating times of the profiled decorative surface are inconsistent; The amount of powder and atomization of the spray gun is improper; the pressure of the compressed air is not stable; the voltage of the high-voltage electrostatic generator is unstable and the static electricity is increased. Control measures: Strengthen the communication between the spray room on the spray room and the spray booth worker, make the selection of the corresponding racks for the profiles; check whether the racks are conductive; the spray room workers enhance the function and make the hanging density and chain speed Coordination of lifting and lowering speed; good control of the ratio of powder extraction and powder feeding; strengthening equipment maintenance and maintaining equipment operation stability.
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