Vertical Sinking Design for Bubble-Free Coating in High-Temperature Automatic Immersion Coating Line

• Fluidized Bed Powder Suspension Technology: Compressed air passes through a porous air-permeable plate to form a fluidized suspension layer of PVC/PE powder (the fluidization factor needs to be determined experimentally; the suspension ratio is typically controlled at 30-50%). When the workpiece is immersed, the powder adheres evenly to the surface. The high-temperature dipping line utilizes a vertical sinking immersion design, utilizing gravity and airflow to reduce coating bubbles and is suitable for large-area mesh (such as insulation barriers and welded wire mesh).
• High-Temperature Plasticization and Curing: After dipping, the workpiece is heated to the powder melting temperature (230-250°C for PVC and 400°C for PE). This temperature is controlled in a double-layer oven with segmented, circulating hot air to ensure temperature uniformity (temperature difference ≤ ±5°C) and prevent bubbling or unmelted coating. The plasticization stage requires precise time control (10-60 seconds) to adjust the coating thickness to 0.4-1.0mm.

1. Mesh Loading → Surface Cleaning → High-Frequency Preheating → Fluidized Bed Dipping → High-Temperature Plasticizing → Cooling and Shaping → Quality Inspection → Automatic Unloading

Key Process Parameters:

• Dipping Time: 10-60 seconds (control thickness 0.4-1.0mm)
• Plasticizing Temperature: PVC 230-250°C, PE 400°C

Typical Applications:

• Highway fencing, welded mesh anti-corrosion coating (load capacity 200-300kg/frame)
• Livestock protection netting, Dutch mesh surface coating

• Efficient Temperature Control: Optimized preheating and plasticizing processes reduce energy consumption by 15-20%
• Modular Design: Supports expansion of functional modules such as exhaust gas purification and automatic detection

• Dipping Machine: Fluidized Bed System: A porous bottom plate interacts with compressed air to create a fluidized suspension layer of PVC/PE powder (30-50% suspension ratio). The workpiece descends vertically into the suspension layer, achieving uniform coating coverage. High-Temperature Heating Module: A gas-fired or electric heating system provides a temperature control range of 150-400°C to accommodate the melting requirements of different materials (e.g., PVC requires 230-250°C, PE requires 400°C), with a temperature control accuracy of ±5°C.
• Pretreatment Module: Surface Pretreatment Equipment: This includes degreasing, pickling, and phosphating tanks, removing oil and oxides from the workpiece surface and forming an active layer to enhance coating adhesion. Preheating Unit: A high-frequency induction heating device preheats the workpiece to 80-120°C, shortening subsequent dipping time and optimizing process efficiency.

• Conveyor Chain/Mesh Belt: Variable Frequency Drive System, with a linear speed of 0.5-2 m/min, adapts to the continuous conveying of workpieces of varying sizes. Customized hangers (single-rack load capacity 200-300 kg) are compatible with vertical suspension requirements such as welded mesh and isolation fences.
• Robotic Arm Assembly: Automatic loading and unloading robotic arms linked to a PLC control system, with a daily processing capacity of 80,000-100,000 pieces, reducing manual intervention. Pneumatic clamps ensure no deformation of workpieces during conveying.

• Plasticizing and Curing Oven: Double-layer oven structure (customizable length 15-20 m). The bottom layer is gas-fired or electric-heated, while the upper layer circulates hot air to ensure temperature uniformity and prevent blistering or unmelted coatings. The temperature control range covers 230-400°C, with step-by-step adjustment to accommodate materials such as PVC and PE.
• Cooling and Forming Module: A water-cooled spray or air-cooling system rapidly reduces temperatures, preventing coating deformation and improving forming efficiency by 20-30%. An optional conductivity detector provides real-time monitoring and alarms for coating defects such as pinholes and bubbles.

• PLC Control Center: Integrated temperature and speed sensors coordinate adjustment of parameters such as dipping time and plasticizing temperature, supporting fault alarms and emergency shutdown protection.
• Environmental Components: Centrifugal filtration waste powder recovery system achieves a powder utilization rate of ≥90%. Catalytic combustion equipment treats exhaust gas, achieving a VOC purification rate of ≥90%.

• High cost performance: Based on the customer's product positioning and development strategy, and with economic affordability as the foundation, we achieve the best cost performance.
• The advanced and meticulous design concept of the equipment, along with the highly automated industrial equipment, showcases the image of a modern and advanced enterprise.
• It has high adaptability, meeting the current production requirements and reserving room for development, taking into account the needs of increased production and improved quality in the future.
• Quality compliance strictly adheres to the ISO900 quality management system, with every minute detail of the entire equipment installation being strictly controlled.