Powder coating principle
Corona charging method
The action of the high-voltage electrode causes the air molecules located near the end of the barrel to generate an ion cloud. When the powder particles pass through the ion cloud, they absorb negative ions and are negatively charged, and are attracted by the positrons of the grounded substrate. A uniform coating film is on the surface of the substrate.
The action of the high-voltage electrode causes the air molecules located near the end of the barrel to generate an ion cloud. When the powder particles pass through the ion cloud, they absorb negative ions and are negatively charged, and are attracted by the positrons of the grounded substrate. A uniform coating film is on the surface of the substrate.
Friction charging method
When the powder particles pass through the non-conductive Teflon barrel, they are positively charged by friction with the barrel wall, and are adsorbed by the sensing substrate. The induced magnetic field is weak, the Faraday effect is slight, and there is no free ion. Therefore, there is no counter ion phenomenon, and the substrate with more complicated shape can be coated with a relatively uniform powder.
When the powder particles pass through the non-conductive Teflon barrel, they are positively charged by friction with the barrel wall, and are adsorbed by the sensing substrate. The induced magnetic field is weak, the Faraday effect is slight, and there is no free ion. Therefore, there is no counter ion phenomenon, and the substrate with more complicated shape can be coated with a relatively uniform powder.
