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

Product Specification

Equipment Description:

I. Dipping Principle
‌1. 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).
‌2. 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.

II. Process Flow and Key Parameters
1. Mesh Loading → Surface Cleaning → High-Frequency Preheating → Fluidized Bed Dipping → High-Temperature Plasticizing → Cooling and Shaping → Quality Inspection → Automatic Unloading
2. Key Process Parameters:
Dipping Time: 10-60 seconds (control thickness 0.4-1.0mm);
Plasticizing Temperature: PVC 230-250°C, PE 400°C

III. Technical Parameters and Application Scenarios

Typical Applications:
Highway fencing, welded mesh anti-corrosion coating (load capacity 200-300kg/frame);
Livestock protection netting, Dutch mesh surface coating.

V. Equipment Advantages
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.

Main structures and components:

I. Core Processing Units
1. 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.
2. 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.

II. Conveying and Automation System
‌1. 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.
‌2. 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.

‌III. Post-Processing and Temperature Control Unit
‌1. 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. 2. 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.

IV. Auxiliary and Environmental Systems
1. 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.
2. 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%.

Features:

1.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.
2.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.
3. 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.
4.Quality compliance strictly adheres to the ISO900 quality management system, with every minute detail of the entire equipment installation being strictly controlled.