Vertical Powder Coating Line

A complete vertical line includes the following stages, configured to your specific production requirements:

• Nano pretreatment or sandblasting — removes contaminants and prepares the surface
• Dryer — removes moisture before powder application
• Detection system — automatic shape recognition for adaptive spray control
• Plastic spray booth — with cyclone recovery achieving up to 98% powder reuse
• Automatic spray guns — reciprocator-mounted, PLC-controlled parameters
• Powder center — manages powder supply, sieving, and reclaim
• Curing oven — uniform temperature distribution for consistent finish quality

The ovens in this line are designed for minimal heat loss and uniform air distribution. Insulation quality directly affects energy costs and coating consistency — uneven temperature means uneven cure, which means rejects. Our ovens maintain tight temperature tolerances across the full chamber length.

Pretreatment is critical for adhesion and corrosion resistance on aluminium. The standard process involves multiple chemical stages designed to remove contaminants, etch the natural oxide layer, and apply a conversion coating. The number of stages depends on your end-use environment and quality standards.

Standard 5-Stage Process

1. Cleaner / Degreaser — removes dirt, oil, and grease from the extrusion process
2. Rinse — removes residual cleaner
3. Etch or Acid Pickling — removes the natural oxide layer, creates a uniform surface
4. Rinse — removes etching byproducts
5. Conversion Coating — applies a corrosion-resistant layer (chromium-free zirconium or chrome)

A final DI (deionized) water rinse is added to prevent contamination before drying.

6 to 8+ Stage Processes

For more demanding requirements — particularly in harsh or coastal environments — additional stages improve chemical deposition and long-term corrosion resistance:

• 6-stage: Additional rinsing or de-smut stage
• 7-8 stages: Reverse osmosis rinses and specialized chrome-free sealing options

Proper pretreatment helps the powder adhere firmly to the aluminium and supports long-term finishing quality in line with standards such as AAMA 2605, Qualicoat, and GSB.