AFNT UV painting line is an automated production line specifically designed for surface coating treatment. Its core technology lies in utilizing ultraviolet (UV) light curing technology to achieve rapid curing and shaping of coatings on the substrate surface. This technology uses high-energy ultraviolet light irradiation to activate photosensitive agents in the coating, triggering a polymerization reaction that transforms the liquid coating into a solid film within a few seconds, thereby significantly improving production efficiency and reducing energy consumption.

UV Painting Line Core Process Flow

Automatic Spraying: Workpieces undergo two spraying cycles (primer and topcoat) using intelligent automated rotation system.

Drying and Leveling: The paint film is extended and shaped in a closed, constant-temperature environment, with a negative pressure environment maintaining stable airflow.

UV Curing: The paint layer undergoes a polymerization reaction within 5-10 seconds under irradiation from high-pressure mercury lamps in a UV curing chamber.

UV Painting Line Equipment Configuration

Spraying System: Includes high-pressure pumps, spray guns, and feeding devices, supporting various types of coatings including solvent-based, water-based, and UV coatings. Spray gun pressure is typically controlled at 0.2-0.6 MPa to ensure proper atomization.

UV Curing Equipment: Uses high-power UV lamps (e.g., 80W/cm² or higher), with a wavelength range covering 365-405nm to match the spectral requirements of different coatings. Curing time can be adjusted according to the coating thickness (0.02-0.1mm), with a typical value of 5-30 seconds.

Conveyor System: Uses chain spindle or belt conveyors with adjustable speed (0.5-5m/min) to adapt to the processing cycle of different workpieces.

Environmental Control System: Equipped with temperature and humidity control devices (temperature 20-30℃, humidity 40-60%) to prevent environmental factors from affecting coating quality.

A typical UV painting line CAD layout

Application Procedures

Above diagram is a typical process of uv painting line setup for plastic vacuum metallization. Chain on edge conveyor system moves every spindle through each treatment stages from load to unload. There’s no hand contact during this closed process so surface finishing quality is maximum protected.

AFNT uv painting line is fully compatible with plastic vacuum coater and widely used in multiple industries such as cosmetic packing containers, car light, car interior and exterior parts(car grill, window frame, car logo etc.), switch panel and socket etc. Machine can be deeply tailored as per customer side spray requirement.

Performance: Basecoat and topcoat process is well followed according to floor plan. Each stage is deeply optimized to meet with quality control requirement.

Turnkey engineering: From process handling, training and after support, AFNT team is always with you!

Application Scenarios and Advantages

UV painting lines are widely used in 3C electronics, automotive parts, home appliances and decorative objects. There’s a long list advantages of this system but gnerally includes the following:

• High Efficiency and Energy Saving: Short curing time, no need for drying equipment, reducing energy consumption by more than 50%
• Excellent Environmental Performance: VOC emissions are lower than traditional solvent-based coatings, meeting EU RoHS standards
• Superior Coating Performance: Hardness can reach above 3H, with significantly improved chemical resistance and wear resistance
• High Class of Automation: Supports PLC control and MES system integration, enabling full-process data traceability.

Precautions

Coating Matching: Specialized UV coatings must be selected based on the substrate characteristics to avoid incomplete curing or cracking

Lamp Maintenance: Regularly replace UV lamps (lifespan approximately 2000 hours) to ensure stable light intensity

Safety Protection: Operators must wear UV-protective glasses and protective clothing to avoid direct skin exposure to UV light.