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Establishing a coating production line begins with defining production requirements, followed by process design and system planning. Only then can custom equipment be designed, manufactured, and installed. Therefore, process design and layout planning form the foundation of an efficient coating line, directly affecting production efficiency and coating quality.
The purpose of coating is to form a continuous and durable protective film on the surface of a workpiece, providing decorative, protective, and functional properties such as corrosion resistance, wear resistance, and enhanced appearance.
The success of a coating project depends on four key factors:
Coating process and equipment
Coating materials
Working environment
Production management
High-quality coating materials provide the foundation for excellent coating performance, while advanced equipment, proper process control, and effective management ensure stable quality, reduced production costs, and improved efficiency.
A complete coating system typically consists of:
Surface pretreatment equipment
Coating application equipment
Drying and curing equipment
Material handling and conveying systems
Clean air supply and environmental control systems
Auxiliary equipment
Pretreatment removes contaminants such as rust, oil, oxide scale, and dirt from the workpiece surface while creating an ideal base layer through phosphating, passivation, or oxidation processes. This ensures excellent coating adhesion, corrosion resistance, and surface finish quality.
Degreasing with cleaning agents or solvents
Water washing and drying
Shot blasting and sand blasting for rust and scale removal
Surface cleaning using compressed air or vacuum systems
Immersion treatment
Spray treatment
Combined immersion and spray treatment
Typical systems include:
Chemical tanks
Heating systems
Ventilation systems
Solution circulation systems
Phosphate sludge removal systems
Oil-water separation systems
Various coating technologies are used depending on product requirements:
Brush coating
Dip coating
Air spray coating
Airless spray coating
Electrostatic spraying
Electrophoretic coating (E-Coating)
Flow coating
Roller coating
An ideal coating environment should provide:
Proper lighting
Controlled temperature and humidity
Clean air conditions
Effective ventilation
Fire and explosion protection
Spray booths are designed to contain overspray and filter paint mist, creating a safe and environmentally compliant working environment while ensuring optimal coating quality.
Suitable for small-batch production.
Suitable for small-sized workpieces.
Suitable for medium-sized workpieces.
Ideal for large workpieces requiring high decorative quality.
Booth enclosure
Paint mist filtration system
Water circulation system
Air supply and exhaust system
Lighting system
Dip coating systems immerse workpieces directly into coating material, allowing a uniform coating film to form on the surface.
Electrostatic spraying uses an electric field to attract charged paint particles to the workpiece surface, improving transfer efficiency and coating quality.
Typical systems include:
Spray booth
High-voltage generator
Electrostatic spray guns
Paint supply system
Safety protection devices
Electrophoretic coating uses an external electric field to deposit dispersed coating particles onto conductive surfaces, creating highly uniform and corrosion-resistant coatings.
Powder coating offers:
High efficiency
Excellent environmental performance
No solvent emissions
Coating thickness above 50 μm in a single application
Typical equipment includes:
Powder spray booth
Electrostatic powder guns
High-voltage generators
Powder feeding systems
Powder recovery systems
Drying ovens are used to cure coatings and achieve desired coating performance.
Convection heating
Radiation heating
Combined convection and radiation heating
Straight-through ovens
Bridge-type ovens
Semi-bridge ovens
Dead-end ovens
Double-layer ovens
U-shaped ovens
Oven chamber
Heating system
Air ducts
Air filters
Air heaters
Circulation fans
Air curtain systems
Temperature control systems
Conveying systems play a critical role in coordinating the entire coating process.
Standard overhead conveyor
Double-chain conveyor
Light-duty conveyor
Power & free conveyor
Hoist conveyor
Skid conveyor
Power & free floor conveyor
Tank chain conveyor
Conventional floor conveyor
Temperature uniformity typically controlled within ±5°C.
Typical requirements include:
Illumination: 800–1000 Lux
Temperature: 23 ± 2°C
Relative Humidity: 55 ± 5%
Air Velocity: 0.45–0.55 m/s
Operating area noise level ≤ 85 dB.
Coating equipment is used to apply liquid paint or powder coatings onto metal, plastic, wood, and other materials through electrostatic attraction or spray technology. The coated workpieces are then cured at elevated temperatures to form a durable protective finish.
A complete coating system typically includes:
Spray guns
Spray booths
Paint or powder recovery systems
Conveyor systems
Drying and curing ovens
Surface pretreatment equipment
These integrated systems are widely used in automotive, industrial equipment, home appliance, construction machinery, aerospace, and metal fabrication industries.
