The working principle of spray powder
Release time:
2024-08-19
The working principle of spray powder is mainly based on electrostatic adsorption and high-temperature curing technology.
The working principle of powder coating is mainly based on electrostatic adsorption and high-temperature curing technology. This technology utilizes the high-voltage corona discharge electric field formed between the spray gun and the workpiece, causing the powder coating particles to carry a negative charge when ejected from the spray gun. Subsequently, these charged powder particles are attracted and adhered to the positively charged surface of the workpiece due to electrostatic attraction.
Specifically, when the powder coating is delivered to the spray gun by the powder supply system through compressed air, the high-voltage electrostatic generator at the front end of the spray gun generates high voltage, resulting in a corona discharge phenomenon. In the discharge area, the powder particles accumulate a large number of electrons, becoming negatively charged particles. These particles are uniformly and tightly adhered to the surface of the workpiece under the influence of the electric field force, forming a coating of a certain thickness.
When the coating thickness reaches a certain level, due to the principle of "like repels like," subsequent ejected powder particles will no longer be adsorbed, thus ensuring the uniformity of the coating thickness. The workpiece is then sent to a high-temperature oven for heating and curing. At high temperatures, the powder coating melts and levels out, ultimately forming a hard, corrosion-resistant, and aesthetically pleasing coating.
Powder coating technology has many advantages, such as uniform coating thickness, strong corrosion resistance, a wide variety of color choices, and low cost. Additionally, since powder coatings do not contain solvents, they reduce environmental pollution and improve labor hygiene conditions. The powder electrostatic spraying process also features cost-saving characteristics for coatings and is widely used in the automotive industry, electrical insulation, corrosion-resistant chemical pumps, valves, cylinders, pipelines, outdoor steel structures, steel furniture, castings, and other surface coatings.
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