The spray washing tunnel type powder coating pretreament works by using many spraying nozzles to spray chemicals onto the processed objects for removing contaminats, supports for high speed fully automatic lines.

The processing stages mainly includes degrease, conditioning, phosphate, rinse. Actual stages should be decided and built according to production requirements

The system mainly constructed with tunnel chamber, spray nozzles, water tanks, chemical liquid tanks, pump systems, liquid heating device, etc, The chamber and tanks are all fabricated by Stainless Steel for the purpose of anti-rust and long service life.

COLO-191S Automatic Coating Gun  The COLO-191S applies digital valve technology for flexibly and precisely setting every parameters. It has 3 pre-set coating modes as well as 20 custom saved programs. combined with 100kv spray gun technology achieves high powder utilization and perfect coating quality even for most complex products.

Integrated Control Cabinet:  A central cabinet combines all the gun controllers for integrated setting of parameters, a host controller could control all units, ensures reliability and controllability. The quantity of the powder coating units installed can be customized.

Powder Coating Reciprocator: Driven by frequency motor, reciprocators carrying spray guns move up and down in programmed stroke and speed. Our reciprocator makes stable, precise motion ensures uniform film thickness and reduce powder waste.

Workparts automatically transported to the booth working station through conveyor, obtains powder coating by automatic reciprocators. The booth flloor has self-cleaning system that avoids powder accumulation, thus powders are easily and continusouly transferred to the powder feed center for recycling. 

Spray Booth wall is made of anti-static PP material for maximum cleaning efficiency & highest powder recovery rate. Cyclone is necessary for fast color change demands. After filter unit is to capture superfine powder particles ensure the vented air is clean.

Drying Tunnel Oven is a part after pretreatment washing for drying,  and Curing Tunnel Oven is a part after for powder spraying.  Maximum painting efficiency is obtained with high capacities by means of those systems.

The workparts transported by conveyors in these tunnels are constantly heated under desired temperature and time, once they exit from the oven, they are fully cured. This project applies infrared gas burner(HD262) as heating elements, which takes full utilization of energy.

Our tunnel oven is made of 150mm rockwool board which minimizes temeprature dropping during long curing time, configured heat-resistent circulation fan circles hot air through the entire chamber, the uniformly heated tunnel with temperature difference less than 3-5 degree, controlled via PLC for a reliable, safe, precise heating process.

Configured with air curtain fans at the entrance and exit, which minimize heat loss.

Overhead conveyors are the most commonly used type for surface finishing. The type of conveyor selected for your operation will depend on the weight, size and even the shape of the items being transported. A complete conveyor system includes rails, chains, tension unit, driving unit, emergency top devices, hangers or trolleys.

COLO conveyor system is durable to work on long-distance transportion , and can endure the harsh chemicals during the pretreament washing. and withstand high temperature during curing process.