Power Free Conveyor System for Metal Shelves Advanced Powder Coating Line

Automatic Powder Coating Line for Long Metal Shelves

Customized Powder Coating System with 13.5-Meter Hangers

This automatic powder coating production line is specially engineered for long metal shelves and similar large fabricated components. The system is equipped with 13.5-meter-long hangers, allowing oversized shelf products to be transported safely and efficiently throughout the coating process.

The powder spray booth is manufactured from durable PP (polypropylene) material, providing excellent chemical resistance, corrosion resistance, and long service life in industrial coating environments.

For powder application, the line combines automatic electrostatic spray guns with manual touch-up stations. Automatic spraying provides efficient and repeatable coating on the main surfaces, while manual application allows operators to cover corners, recessed areas, joints, and other difficult-to-reach sections.

A Power and Free overhead conveyor is used for material handling, providing flexible workpiece movement and accumulation between different process stages. Manual loading and unloading are adopted to accommodate the dimensions and structural characteristics of long shelf products.

Main Features

• 13.5-meter hanger configuration for long shelf components

• Automatic electrostatic powder spraying

• Manual touch-up for complex and recessed areas

• PP powder spray booth

• Power and Free overhead conveyor

• Manual loading and unloading

• Flexible material handling for different shelf designs

• Customized process and equipment configuration

Power and Free Conveyor System

Handling long workpieces requires careful consideration of conveyor routing, hanger design, loading capacity, and available workshop space.

The Power and Free conveyor allows carriers to move, stop, and accumulate according to production requirements. This provides greater process flexibility than a conventional continuously moving conveyor, particularly for large or irregular products.

The conveyor configuration can be engineered according to:

• Maximum workpiece dimensions and weight

• Hanger length and spacing

• Required production capacity

• Process cycle time

• Loading and unloading arrangement

• Factory layout and available height

Automatic and Manual Powder Application

The spraying section is designed to balance productivity with coating flexibility.

Automatic spray guns provide consistent powder application during regular production, helping maintain stable film thickness and repeatable surface quality. Manual touch-up stations supplement the automatic system where product geometry makes complete automatic coverage difficult.

This combination is particularly suitable for shelf structures containing multiple edges, joints, corners, or recessed surfaces.

PP Powder Spray Booth

The powder booth uses a PP structure suitable for industrial powder coating applications.

Advantages include:

• Good chemical and corrosion resistance

• Durable construction

• Convenient cleaning and maintenance

• Suitable for continuous production environments

• Adaptable booth dimensions according to workpiece size

The booth, extraction system, powder recovery equipment, and gun arrangement can be configured according to production requirements.

Powder Coating Process

1. Surface Cleaning and Preparation

Before coating, metal components must be properly cleaned to remove oil, grease, dust, fabrication residues, and other surface contaminants.

Effective surface preparation provides a clean substrate for subsequent chemical treatment and helps improve coating adhesion and long-term finishing performance.

2. Pretreatment

After cleaning, the workpieces undergo a suitable pretreatment process according to the substrate material and required corrosion resistance.

The process may include several cleaning, rinsing, and conversion-treatment stages. The exact pretreatment configuration is selected according to the product material, operating environment, and required coating performance.

3. Drying

Following pretreatment, residual moisture is removed before powder spraying.

The workpieces pass through a drying section until the surfaces are sufficiently dry for electrostatic powder application. Proper drying helps prevent coating defects caused by remaining water or moisture.

4. Electrostatic Powder Application

The prepared workpieces enter the powder spray booth, where electrostatically charged powder is applied to grounded metal surfaces.

Automatic spray guns perform the primary coating operation, providing efficient and repeatable powder deposition. Manual touch-up can then be used for areas requiring additional coverage.

This combined spraying method helps achieve:

• Uniform powder distribution

• Consistent coating thickness

• Better coverage of complex structures

• Reduced manual spraying workload

• Stable production quality

5. Powder Curing

After spraying, the coated products are transported into the curing oven.

Under controlled heating conditions, the applied powder melts, flows, and chemically cross-links to form a continuous coating film. Correct curing parameters are selected according to the powder specification, workpiece characteristics, and required coating performance.

6. Cooling

After leaving the curing oven, finished workpieces are allowed to cool before further handling.

The cooling stage stabilizes the finished coating and prepares the products for inspection, unloading, or subsequent production processes.

7. Final Quality Inspection

Finished products can be inspected according to the applicable coating requirements.

Typical inspection items include:

• Coating thickness

• Surface appearance

• Coating uniformity

• Adhesion

• Color and finish

• Visible coating defects

Custom-Engineered Powder Coating Solutions

Our powder coating production lines are custom-designed according to each customer's products, production requirements, and factory conditions rather than supplied as a single standard configuration.

Important engineering parameters include:

• Workpiece dimensions and weight

• Daily or hourly production capacity

• Product material

• Required coating performance

• Pretreatment requirements

• Number of colors and color-change frequency

• Available factory space

• Heating energy source

• Required automation level

Based on this information, we can develop a suitable process layout, conveyor configuration, spraying system, curing solution, and overall equipment arrangement.

Contact us with your product specifications and production requirements to receive a customized technical proposal and quotation for your powder coating project.