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

Product Specification

Equipment Description:

I. Dipping Principle
‌1. 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.
‌2. 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.

II. Typical Process Flow and Key Parameters
1. Workpiece Loading → Surface Cleaning → High-Frequency Preheating → Fluidized Bed Dipping → Plasticization and Curing → Cooling and Shaping → Automatic Inspection → Finished Product Unloading
2. Key Parameter Controls:
Dip Time: 10-60 seconds (Coating Thickness 0.3-1.0mm);
Plasticization Temperature: 230-250°C (Critical PVC Melting Temperature Range).

III. Technical Parameters and Application Scenarios

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

Main structures and components:

I. Core Processing Units
1. 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.
2. 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.

II. Automated Conveying System
1. 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. 2. Robotic Arm Assembly

Integrated automatic loading/unloading robotic arms enable fully automated operation, achieving a processing efficiency of 80,000-100,000 pieces/day.

III. Temperature Control and Curing Unit

1. 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.

2. Cooling and Forming Module

Water-cooled spray or air-cooled devices provide rapid cooling and forming, preventing deformation of the PVC coating.

IV. Control and Environmental Protection System

1. 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.

2. 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%. 5. Auxiliary Functional Components
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.

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.