The Difference between Coating Processes


Coating Line

Wuxi Longterm Machinery Technologies Co., Ltd. is an influential manufacturer of coating equipment,environment-protective plating equipment, green environment-protective powder, and other specialized coating production. Our company pays attention to product innovation, with 20 invention patents and 119 utility model patents; 12 provincial first (sets) coating and environmental protection equipment; the technical indicators of the products are the leading domestic and international advanced products. It has been established at the forefront of the domestic coating and coating industry; its products are exported to the Middle East and Southeast Asia, which has enhanced the competitiveness of domestic and foreign markets. The company covers an area of 75,000 square meters, with 51,000 square meters of workshops and technology buildings. It has more than 250 employees, including 53 technicians with intermediate and senior titles. It has strong technical strength and has a solid foundation for improving product technology and quality. Up to now, our company has presided over the formulation of 2 national standards in the coating industry, participated in the formulation of 15 national standards, presided over the formulation of 1 industry standard, and participated in the formulation of 10 industry standards. Our company enjoys a good reputation both at home and abroad for its excellent quality and perfect service. With the constant pursuit of product quality and brand upgrading, we are willing to work together with friends in the same industry and people of insight from all walks of life to achieve intelligent manufacturing 2025 and industry 4.0 for the country and achieve common prosperity.

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Types of coating processes

The coating process can generally be divided into powder spraying, painting spraying, and electrophoresis. After surface treatment of the workpiece, according to the requirements of different workpieces on the appearance and corrosion resistance, select the appropriate spraying process and equipment, and pay attention to the control of the leveling, drying, cooling, and other processes, otherwise, it will adversely affect product quality.



Wuxi Longterm Machinery Elevator-powder-coating-line

Powder spraying process


Carrier rocket high temperature gel powder coating--Wuxi Longterm Machinery

The correct name for powder spraying is electrostatic powder spraying, which is not simply a spray gun. The composition of the electrostatic powder spraying equipment is composed of a powder supply barrel (which uses compressed air to supply powder), a high-voltage electrostatic generator, and an electrostatic powder spray gun.



(二)Powder electrostatic surface coating process

Workpiece pretreatment (pre-degreasing → degreasing → water washing 1 → water washing 2 → silanes or caramelization → water washing 3 → water washing 4) → moisture drying → powder spraying → baking curing → inspection → finished product. The workpiece needs to be sufficiently cooled to below 35 ℃ to ensure the physical and chemical properties and appearance quality of the workpiece after dusting.

Painting process


Automobile powder coating---Wuxi Longterm Machinery

Spray paint is to disperse liquid paint (commonly known as paint) into paint mist particles by means of compressed air and adhere to the surface of the object to be coated.


Polishing → Wiping → Electrostatic Dust Removal → Spraying Primer → Leveling of Primer → Surface Drying → Spraying Paint → Leveling of Color Paint → Spraying Varnish → Leveling of Clear Paint → Drying → Cooling


Electrophoresis process


Wheel powder coatingThe workpiece is placed in the electrolyte, and the other electrode in the electrolyte is connected to both ends of the DC power supply respectively, forming an electrolytic circuit. The electrolyte is a conductive water-soluble or water-emulsified paint. The dissociated cations in the paint solution move to the cathode under the action of the electric field force, and the anions move to the anode. The surface of the workpiece loses charge and forms a wet coating.


Hanging → degreasing → washing → derusting → washing → surface adjustment → phosphating → washing → deionized water washing → electrophoresis → washing → deionizing washing → compressed air blowing → drying → hanging down.



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