3. Cartridge (Filter Element) Recovery Systems

Schematic diagram of the structure and principle of cartridge (filter element) type filter

(1) in motion state; (2) in cleaning state 1-clean air outlet; 2-air blowing pipe; 3-filter element; 4-inlet containing powder coating; 5-air blowing in; 6-powder coating

An evolution of the bag filter, the cartridge system operates on the same principle but with a more compact and efficient design. These filters can be installed directly inside the spray booth.

• How it Works: Air carries overspray into the cartridge; the filter media traps the powder on the exterior while clean air passes through. A timed pulse-jet nozzle blows compressed air from the inside out to knock the powder down for collection and reuse.

• Advantages: Compact footprint, short recovery loops that preserve powder properties, high safety (no dust explosion risk), and easy color changes.

• Disadvantages: Limited capacity; best for standalone units rather than large-scale automated lines.

A coating system equipped with a cartridge (filter element) type powder coating recovery device includes: 1-Spray gun; 2-Power supply; 3-Powder spraying chamber; 4-Coated object; 5-Cartridge (filter element) type powder recovery device; 6-Cyclone separator; 7-Rotary valve; 8-Powder supply tank; 9-Pump; 10-Capacity feeder.

4. Belt-Type Recovery Systems

Conveyor Belt Powder Coating Recovery Equipment Coating System: 1-Powder Spraying Chamber; 2-Filter Conveyor Belt; 3-Spray Gun; 4-Vacuum Powder Suction Unit; 5-Reciprocating Transfer Machine; 6-Exhaust Air Filter; 7-Exhaust Fan; 8-High-Performance Filter; 9-Mini Cyclone Separator; 10-Rotary Valve; 11-Vibrating Screen; 12-Paint Tank; 13-Ultra-fine Powder Collector; 14-Bag Filter; 15-Safety Filter; 16-Recovered Air; 17-Coating Control Cabinet; 18-Quantitative Powder Feeding Device; 19-Backflush Nozzle; 20-Color Changer

This system uses a continuous, moving belt made of filter cloth located beneath the spray booth.

• How it Works: Air passes through the moving belt, which captures the powder. A vacuum suction device then removes the powder from the belt and sends it to a cyclone or bag filter for final processing.

• Advantages: Low airflow requirements ($5m^3/min$) and energy-saving operation. If booth walls are made of non-stick materials, color changes become very efficient.

• Disadvantages: The overall system structure and its accessories are quite complex.

  
  

5. Film-Type Recovery Systems

Thin-film recycling equipment coating system (a) Cross-sectional view of the powder spraying chamber; (b) Structural diagram of the recycling system 1-New membrane; 2-Used membrane; 3-To the powder spraying chamber; 4-Conveyor line; 5-Cyclone separator; 6-Bag filter; 7-Exhaust fan; 8-Coated object

Designed for maximum flexibility, this system lines the booth walls with transparent plastic film.

• How it Works: When a color change is required, the used film is rolled up to recover the powder, and fresh film is rolled out. The booth is connected to a external cyclone and bag filter system.

• Advantages: Extremely fast color changes—typically around 10 minutes. It is the ideal solution for coating systems that require frequent color swaps.

  
  

In our latest technical breakdown, we look at three advanced recovery methods:

✅️ Cartridge Systems: Compact and safe, perfect for localized spraying with minimal powder loss.

✅️ Belt-Type Systems: An energy-saving "moving floor" solution that maintains uniform airflow for a perfect finish.

✅️ Film-Type Systems: The ultimate choice for high-variety shops. Switch colors in as little as 10 minutes!