Electrostatic Powder Coating Machine

The Powder Coating Plant Process Powder coating has today established itself as the most effective means of metal surface finishing. It has replaced liquid painting and various methods of electroplating due to the many advantages this process offers …  Substantial improvement to chemical corrosion  Substantially improved resistance to mechanical abuse – better scratch resistance, abrasion resistance and mechanical wear and tear  Cleaner process for improved environment  Faster process for better productivity through the paint-shop  Requires less skills for high quality coatings  Guarantees uniform and consistent results  Substantially improved aesthetics for higher sales value of the finished product  Requires lower energy per Meter2 of surface coated  Requires lesser care in storing and packing due to the toughness of the coat  Is cost-effective Powder coating is a simple process requiring minimal skills and training. The articles to be coated are first cleaned of all foreign matter from the surface. Mild steel components need to go through a phosphate conversion coating. Aluminum components go through a chromate conversion coating. This, known as pretreatment, is employed for improved bonding of the powder coat to the material being coated to provide a longer life to the coat. The method employed usually is a dip in chemicals and water in various tanks. Occasionally, the process may be automated through a spray pretreatment process. A batch powder coating system:

A conveyorized powder coating system: The ‘pretreated’ articles are jigged and loaded onto the continuously moving overhead conveyor. As the conveyor moves the articles through the coating booth, they are coated on all sides by manual and/or automated spray guns. The conveyor then carries the articles into the tunnel oven (or in a semi-automated version, the articles are offloaded for off-line curing). In the oven, at a skin temperature of 180-220oC, in 10-15 minutes, the powder melts, polymerizes, fuses and cures into the tough uniform and consistent powder coat that has high aesthetic value. At the end of the curing schedule, the article moves out of the oven (or the trolley is rolled out of the oven) and allowed to cool down through a cool-off zone. The articles are then removed off the conveyor and taken out of the paint-shop.

POWDER SPRAY SYSTEM (also known as the powder coating machine) – is considered the heart of the powder paint shop. Normally an electrostatic powder spray system is used. This sprays electrostatically charged powder into the spray booth where the articles to be coated are hung. Electrostatic forces provide a uniform and consistent coating quality. Major strides have been made in the design of these machines offering major benefits to the user

POWDER COATING BOOTH WITH RECOVERY SYSTEM – in which the actual powder coating is carried out. The efficiency of recovery of over sprayed powder for reuse decides the economics of powder coating. The efficiency of overall retention of over sprayed powder decides the pollution-free worthiness of the system. There are two types of powder recovery booths – Filter Cartridge type and the Hyper Cyclone type.

CURING OVEN – in which the powder coated articles are placed for 10 to 15 minutes at the recommended temperature for the powder to melt, polymerize, fuse and cure into the final finish of high aesthetic appeal with strong mechanical and chemical properties