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Product Specification

Equipment Description:

I. Dip Coating Principles
‌1. Basic Process Principles‌
The dip coating process involves immersing a preheated workpiece in fluidized plastic powder. High temperatures are used to uniformly adhere the powder, causing it to melt and solidify, forming a coating. The core principles are as follows:
The preheated metal surface attracts the plastic powder particles, forming a preliminary adhesion layer;
The fluidized bed uses airflow to suspend the powder, ensuring uniform coating coverage;
The secondary heating process completely melts and solidifies the powder, forming a dense protective layer (typically 0.5-2mm thick).
‌2. Differences from Spray Coatings‌
No electrostatic adsorption is required; adhesion is achieved solely through contact between the workpiece temperature and the fluidized powder.

It is suitable for complex or hollow workpieces (such as shelves and guardrails), enabling full-surface coating.

‌II. Key Process Parameters

III. Technical Advantages
Coating Performance: Wear-resistant and corrosion-resistant, suitable for outdoor environments;
Applicability: Suitable for processing irregularly shaped workpieces without the need for complex spray equipment;
Environmental Performance: High powder utilization rate, exhaust emissions comply with GB 30981 standards. 

Main structures and components:

I. Core Structural Units
1. Pretreatment Equipment
Degreasing and Rust Removal Unit: This includes a spray-type multi-station unit or shot blasting machine, used to remove impurities from the metal surface through degreasing, pickling, and multiple water rinses to ensure subsequent coating adhesion.
Phosphating Tank: This enhances the workpiece surface activity through a process of pre-degreasing, degreasing, water rinsing, surface conditioning, phosphating, and pure water rinsing.
2. Preheating System
Gas/Electric Furnace: This heats the workpiece to 180-250°C with a heating uniformity error of ≤5°C to prevent premature solidification of the powder.
Temperature Control Module: This integrates a PID controller and thermocouple sensor to monitor and provide real-time feedback on temperature changes.

3. Fluidized Bed Dipping System
Fluidized bed body: Multi-layer porous plate structure (pore size 0.05-0.2mm), with compressed air (0.05-0.15MPa) flowing from the bottom to fluidize the plastic powder.
Steel or composite trough, equipped with an antistatic coating to prevent powder clumping.
Lifting mechanism: Electric/hydraulic drive, controls the angle and speed of the workpiece immersed in the fluidized bed (typical lifting speed 0.5-2m/min).
4. Curing Equipment
Secondary heating tunnel: Length 10-30 meters, temperature settings 180-220°C, three-stage temperature zone (heating → constant temperature → slow cooling), holding time 10-30 minutes.
Exhaust gas treatment module: Integrated RTO incinerator or activated carbon adsorption system, VOC emissions comply with GB 30981 standards. 5. Control System
PLC Control Cabinet: Integrated Human-Machine Interface (HMI) enables programmable control of parameters such as temperature, lift speed, and airflow pressure.
Safety Interlock: Equipped with over-temperature alarm, emergency stop button, and gas leak detection.

II. Key Auxiliary Components
Powder Recovery System: Utilizes a cyclone separator and filter element for two-stage recovery, achieving a powder utilization rate exceeding 95%.
Workpiece Conveyor: Chain/roller conveyor system, supporting workpieces up to 3m x 1.5m in size.
Material Buckets and Racks: Stainless steel containers with a capacity of 500-2000L for plastic powder storage and fluidized feed.
Cooling Water Circulation System: Provides forced cooling for high-temperature components such as the hydraulic system and furnace slides.

III. Structural and Performance Features

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.