Pretreatment lines
Pretreatment removes oil, dirt and rust and leaves a conversion layer the coating can bond to. We build spray washing tunnels for conveyorised lines, dip tanks for batch work and tunnel washers for continuous flow, each followed by a drying oven so the part reaches the booth dry and warm.
Spray washing lines and dip tanks. Two-stage spray lines, tunnel washers
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Spray washing line
Tunnel-type pretreatment line that removes oil, dirt and rust with spray stages before coating.
Product pageExample line 2 stages Method Spray Drying Tunnel oven -
Dip pretreatment tanks
Pretreatment line where parts are immersed in the baths in sequence.
Product pageMethod Immersion Baths Per project Handling Crane or conveyor -
Tunnel washer
Line where parts moving on the conveyor are washed by spray inside a tunnel.
Product pagePass Conveyorised Method Spray Size Per project
What it is for
Parts and situations this category is built for.
- Steel parts with oil, drawing compound or light rust from fabrication
- Aluminium profiles and castings before architectural or industrial powder
- Galvanized parts that need a conversion coating before powder
Who buys this
The buyer groups we most often size this category for.
- Extruders and architectural coaters working to a durability class
- OEMs replacing manual wiping with a controlled process
- Automotive suppliers whose customers audit the pretreatment
Questions we get before the quote
Answered in full. The sizing guide goes deeper. Sizing guide
How many stages do I need?
A two-stage spray line (degrease, rinse) is the minimum for clean steel that will be coated the same day; iron phosphate or a zirconium conversion coat adds one to two stages and rinses; architectural aluminium to a durability class adds an etch and a conversion stage. The example line on the Turnkey powder coating plant page has two stages; yours follows the corrosion class you must reach.
Spray tunnel or dip tanks?
Spray suits continuous lines and open shapes; dip suits batch work and parts with cavities the spray cannot reach. Many lines combine a dip degrease with spray rinses.
Quote for pretreatment lines
Send the largest part, the quantity per shift and the line speed if you have one. Drawings help; photographs of the parts are enough to start.