State-of-the-Art Automatic Immersion Coating Line for High-Volume PVC Powder Coating Production

• Fluidized Bed Technology: Compressed air passes through a porous air plate at the bottom, creating a fluidized suspension layer of PVC powder. After immersion, the workpiece adheres evenly to the powder coating. Fluidized bed parameters (such as gas flow rate and powder suspension ratio) directly affect coating uniformity. The suspension ratio is controlled between 30-50% to meet the requirements of PVC protective covers.
• Heating and Curing Process: After dipping, the workpiece enters a plasticizing furnace (230-250°C), where the PVC powder melts to form a continuous, dense coating. A circulating hot air system ensures uniform temperature distribution with a temperature control accuracy of ±5°C, preventing local overheating or unmelted defects.

1. Workpiece Loading → Surface Cleaning → High-Frequency Preheating → Fluidized Bed Dipping → Plasticization and Curing → Cooling and Shaping → Automatic Inspection → Finished Product Unloading

Key Parameter Controls:

• Dip Time: 10-60 seconds (Coating Thickness 0.3-1.0mm)
• Plasticization Temperature: 230-250°C (Critical PVC Melting Temperature Range)

Typical Applications: Automotive accessory covers, hardware tool handles, and pipe anti-corrosion coatings.

• Modular Design: Supports optional modules such as high-frequency preheating and exhaust gas purification.
• Energy Saving and Environmental Protection: Waste powder recovery and exhaust gas purification systems reduce production costs and pollution.

• Dipping Machine:
  • Fluidized Bed System: A porous air plate at the bottom uses compressed air to uniformly fluidize the PVC powder, ensuring consistent coating thickness (0.2-1.5mm) for the protective cover.
  • Hydraulic Lid: A symmetrical hydraulic cylinder drives the lid for easy internal cleaning and maintenance.
  • Heating Module: Electric heating tubes or an anthracite furnace provide adjustable plasticizing temperature (150-300°C) to meet the melting requirements of the PVC powder.
• Pre-treatment Module:
  • Cleaning Station: A spray or ultrasonic cleaning system removes oil and oxides from the workpiece surface, improving coating adhesion.
  • Preheating Unit: A high-frequency preheating power supply accelerates workpiece temperature, shortening plasticizing time and optimizing production efficiency.

• Chain Drive Track: A gear chain coupled with a variable-frequency speed motor supports linear speeds of 0.5-2m/min, suitable for continuous production. Customized hanger design accommodates workpieces of various shapes, such as pipe sheaths and valve handles.
• Robotic Arm Assembly: Integrated automatic loading/unloading robotic arms enable fully automated operation, achieving a processing efficiency of 80,000-100,000 pieces/day.

• Drying and Curing Chamber: Double-layer design, with bottom layer heating (electric heating tubes or gas furnaces) and upper layer circulating hot air for even distribution, achieving a temperature control accuracy of ±5°C. Customizable length (15-20m) to accommodate large-scale production needs.
• Cooling and Forming Module: Water-cooled spray or air-cooled devices provide rapid cooling and forming, preventing deformation of the PVC coating.

• PLC Control Center: Integrated temperature and humidity sensors and a speed feedback module enable automated adjustment of parameters such as temperature and conveying speed. Supports fault alarms (e.g., temperature exceeding limits, transmission jams) and emergency shutdown protection.
• Environmental Treatment Unit: The waste powder recovery system reduces PVC material loss through centrifugal filtration (recovery rate ≥ 90%). The catalytic combustion equipment treats exhaust gas, achieving a VOC emission purification rate of ≥ 90%.

• Molds and Hangers: Custom molds can be adapted to complex-shaped protective covers, such as automotive parts and hardware tool covers.
• Pneumatic demolding devices improve demolding efficiency and reduce manual intervention.