Electrostatic spraying powder coating

Common problems of electrostatic spraying powder coatings

1. Coating impurities

The common impurities mainly come the particles in the powder spraying environment other impurities caused by various factors, which are summarized as follows.

1) Impurities in curing furnace. The solution is to thoroughly clean the inner wall of curing furnace with wet cloth vacuum cleaner, focusing on the gap between suspension chain air duct. In case of large black particles, it is necessary to check whether the filter screen of air supply pipe is damaged, replace it in time.

2) Dust spraying in the room. It is mainly dust, clothing fiber, equipment abrasive particles dust spray system scale. The solution is to use compressed air to blow the powder spraying system before starting work every day, clean the powder spraying equipment powder spraying room thoroughly with wet cloth vacuum cleaner.

3) Suspended chain impurities. It is mainly the product of corrosion of suspension chain oil baffle primary spreader water tray (made of hot-dip galvanized sheet) by acid alkali vapor pretreatment. The solution is to clean these facilities regularly.

4) Powder impurities. It is mainly due to excessive powder additives, uneven dispersion of pigments powder spots caused by extrusion. The solution is to improve the quality of powder improve the way of powder storage transportation

5) Pretreatment of impurities. It is mainly the large particle impurities caused by the phosphating slag the small impurities caused by the yellow rust of the phosphating film. The solution is to clean up the slag in the phosphating tank spray pipeline in time, control the concentration proportion of phosphating bath solution.

6) Water quality impurities. It is mainly the impurities caused by excessive sand content salt content in the water used for pretreatment. The solution is to add a water filter use pure water as the last two stages of cleaning water.