Powder coating (also known as electrostatic powder coating) is a popular coating solution that has developed rapidly in recent years. Compared with paint spraying, powder coating has the characteristics of high hardness, thick coating and better weather resistance. Electrostatic powder coating is mainly used in the surface treatment of metal products, such as: racks, profiles, cabinets, fence and any metal products, etc. With the continuous improvement of powder coatings, its spraying effect has the advantages of high gloss, fineness and scratch resistance, which is completely comparable to paint spraying.

AFNT Powder coating line is programmed by newest technologies for metal surface treatment. Either from pre-treatment system or powder spraying booth, it’s optimized on every side according to modern production requirements. With more than ten years of on-site production and installation experience. We’re able to handle various powder coating process requirements and production requirements with industry’s most advanced technical guidance.

Core Parts of an Electrostatic Powder Coating Line

1. Hang conveyor: a pass-through suspension chain conveyor, which can be equipped with a die-forged chain or an accumulation chain according to the characteristics of the product on load; the conveyor is a closed-loop design and continuously passes through each processing node according to the process flow and speed frequency.
2. Pre-treatment: Mainly includes grinding, degreasing, cleaning, ceramic/phosphating and other processes to ensure the cleanliness and surface protection of the product before powder spraying.
3. Drying furnace: After pre-treatment and before powder coating, the product must be completely dry and maintain a certain residual temperature to improve powder adhesion.
4. Powder coating booth: The mono cyclone automatic recycling powder coating booth is a sandwich structure of non-stick engineering plastics, the powder recovery rate can reach more than 98%.
5. Powder curing furnace: Gas-fired central heating furnace can ensure that the furnace temperature is steplessly adjusted between RT-220 degrees. The air supply structure is reasonable and comes with a safety alarm device.
6. Spray method: The powder coating booth is equipped with 2 up and down reciprocators. Manual operation platform at the entrance and exit can be equipped with a robot for full automatic operation.
7. Electric control: The powder coating process is controlled by PLC & HMI, all crucial components are Siemens production.

The principle of electrostatic powder spraying: a high-voltage corona discharge electric field is formed between the spray gun and the workpiece. When the powder particles are ejected from the spray gun mouth and pass through the discharge area, a large number of electrons are collected and become negatively charged particles. Under the action of electrostatic attraction, they are adsorbed to the positively charged workpiece. When the powder adheres to a certain thickness, a “like poles repel” effect will occur and the powder can no longer be adsorbed, so that the thickness of the powder layer in each part is uniform, and then the powder layer is leveled into a uniform film layer after heating, baking and solidification.

A typical powder electrostatic spraying process: Loading → Degreasing → Cleaning → Rust removal → Cleaning → Phosphating → Cleaning → Passivation → Powder spraying → Solidification → Cooling → Unloading

Powder coating process configuration table (for reference only):

AFNT Powder Coating Line Construction Standards

• BG 12367-2006, the dust-proof cold water source lighting is used in the powder spraying area, and its illumination should comply with the provisions of Article 4.3.1 of BG 12367-2006
• GB 12158, General Guidelines for Preventing Static Electricity Accidents
• GB 12367-2006, Safety Regulations for Painting Operations Safety of Electrostatic Spray Painting Process
• GB 14443, Safety Regulations for Painting Operations Safety Technical Regulations for Coating Drying Room
• GB 14773, Safety regulations for painting operations Safety technical conditions for electrostatic spray guns and their auxiliary devices
• GB 2893, safety color (GB 2893-2001, ISO 3864:1984, NEQ)
• GB 2894, safety signs (GB 2894-1996, ISO 3864:1984, NEQ)
• GB 7691, Safety Regulations for Painting Operations General Principles of Safety Management

The AFNT automatic powder coating line provides a variety of spraying methods, such as fixed spray gun spraying, multi-axis reciprocating machine and spray robots. Customers can choose reasonably according to the requirements of the sprayed product itself. Our company provide complete solutions! According to the environmental requirements of dust-free coating, AFNT can program dust-free workshop for the entire factory. The project includes: 10,000 class clean air supply and pipeline project, clean room isolation and lighting project, FDA-level epoxy floor paint project and waste air treatment project, providing customers with a turnkey solution for whole-plant coating!

AFNT Powder Coating Line Outstanding Advantages

• A thicker coating can be obtained in one coating, for example, a coating of 100 to 300 μm. With ordinary solvent coatings, it takes about 4 to 6 coatings, while with powder coatings, this thickness can be achieved in one time. The corrosion resistance of the coating is very good.
• It adopts new processes such as powder electrostatic spraying, which is highly efficient and suitable for automatic coating, powder utilization rate is high and it can be recycled.
• Coating line appearance is beautiful and elegant, reflecting the corporate spirit.
  The speed is adjustable, and there is no dead corner during the entire spraying process.
• Powder coating line main components are world class or joint venture products.
• Comprehensive and thoughtful safety protection measures and use and maintenance instructions.
• 24-hour quick response technical support.
• Centralized control, equipped with full-line operation indication images, overload protection and alarm facilities.
• All models are inspected and debugged by engineering team before shipment, quick onsite installation which greatly saves customer’s cost.

Our company has more than 10 years of industry experience and can meet your high-end painting requirements. The company integrates R&D, design, manufacturing, sales and services, and its industries cover various manufacturing industries such as home appliances, electronics, computers, hardware, plastics, leather goods, lighting, wood industry, toys, and food. Welcome to call us for consultation!