How does electrostatic spraying work?

The electrostatic spraying of powder coating is called spraying, and its principle is to use the corona discharge phenomenon to adsorb the powder coating on the workpiece.

The process is as follows: the powder coating is sent to the spray gun by the powder supply system by compressed air gas, the high voltage generated by the high-voltage electrostatic generator is added at the front end of the spray gun, due to the corona discharge, a dense charge is generated near it, when the powder is sprayed out by the nozzle, the charged coating particles are formed, it is subjected to the action of electrostatic force, and is sucked to the workpiece opposite to its polarity, with the increase of powder sprayed, the more the charge accumulates, when it reaches a certain thickness, due to the electrostatic repulsion effect, it does not continue to adsorb, So that the whole workpiece obtains a certain thickness of powder coating, and then the powder is melted, leveled and solidified by heat, that is, a hard coating film is formed on the surface of the workpiece Tianwei steel structure.

When working, the spray gun or spray tray and spray cup of electrostatic spraying, the paint particles are partially connected to the negative electrode, and the workpiece is connected to the positive electrode and grounded, under the action of the high voltage of the high-voltage power supply, an electrostatic field is formed between the end of the spray gun (or spray disc and spray cup) and the workpiece. When the voltage is high enough, the area near the end of the spray gun forms an air ionization zone, and the air is intensely ionized and heated, so that a dark red halo is formed around the sharp edge of the end of the spray gun or the pole needle, which can be clearly seen in the dark, and the air produces a strong corona discharge.

Most of the film-forming substances in the coatings, namely resins and pigments, are composed of polymer organic compounds, mostly conductive dielectrics, and solvent-shaped coatings also have organic solvents, co-solvents, curing agents, electrostatic diluents, and other additives in addition to film-forming materials. In addition to benzene, xylene, solvent gasoline, etc., most of these solvent-based substances are polar substances, with low resistivity and certain conductivity, which can improve the charged performance of coatings.

The molecular structure of dielectrics can be divided into polar molecules and non-polar molecules. Dielectrics composed of polar molecules show electrical properties when subjected to an applied electric field; Dielectrics composed of non-polar molecules are good on the outside.

The paint is sprayed out after atomization by the nozzle, and the atomized paint particles are charged by contact when they pass through the edge of the pole needle of the muzzle or the edge of the spray tray and spray cup, and when they pass through the gas ionization zone generated by corona discharge, the surface charge density will be increased again. The electrostatic field of these negatively charged paint particles moves the surface of the workpiece with a direct polarity and is deposited on the surface of the workpiece to form a uniform coating film.

Electrostatic spraying refers to the coating method that uses the principle of corona discharge to make the atomized coating charged negatively under the action of high-voltage direct current electric field and adsorbed on the surface of the charged substrate. Electrostatic spraying equipment consists of spray guns, spray cups and electrostatic spraying high-voltage power supplies.

The working principle of electrostatic spraying equipment: on the tip of the electrostatic spray gun, there is a negative high-voltage static electricity, when the voltage reaches high enough, the air in the area near the tip produces a strong corona discharge, forming a gas ion area. When the atomized paint particles from the electrostatic spray gun are in this area, the atomized particles of the paint become negatively charged.

The painted workpiece is suspended on a grounded conveyor line, and the surface of the workpiece has a positive charge. According to the electrostatic principle of opposite-charge attraction, the negatively charged paint mist particles move to the heterogeneous working surface, are adsorbed and deposited on the surface of the workpiece, forming a uniform and dense paint film, and the workpiece is coated.

The definition of electrostatic spraying is: a spraying method that uses high-voltage static electricity to significantly improve the efficiency of paint transfer.

The principle is: the workpiece is grounded with a positive charge, the electrostatic generator produces a negative charge, the paint is charged when it passes through the spray gun, and the principle of positive and negative attraction, the paint is adsorbed on the surface of the workpiece.

Whether it is a powder or a liquid, the principle of electrostatic electricity is the same.

Electrostatic spraying is a spraying technology that is controlled by a special electrostatic generator with negatively charged particles such as paint, alumina, iron powder, metal powder, etc. running in the container, and controlled by the first mechanism and control system.

Advantages: 1. The coating thickness and uniformity of electrostatic spraying are very good, especially when the coating thickness is ultra-thin;

2. The quality of electrostatic spraying particles is very stable and more efficient;

3. Due to the high accuracy of electrostatic spraying, it can save the amount of paint used and achieve better economic benefits;

4. The coating thickness of electrostatic spraying is thin, and the coating thickness can be adjusted according to the customer's requirements to meet the needs of customers.

Disadvantages: 1. Due to the complexity of electrostatic spraying technology, it is not suitable for high temperature and corrosive oil environment;

2. Electrostatic spraying equipment is expensive and the cost of use is high;

3. Electrostatic spraying may cause toxic waste, which needs to be professionally treated;

4. The operation and maintenance of electrostatic spraying equipment is difficult and requires professional technicians.

The working principle of electrostatic spraying technology is to make the paint part sprayed by the spray gun or spray tray and spray cup of electrostatic spraying positive charged, and the workpiece is negatively charged, and under the action of high voltage of high-voltage power supply, an electrostatic field is formed between the end of the spray gun or spray tray and the spray cup and the workpiece. At this point, the paint forms a large cloud of paint, which is adsorbed on the negatively charged workpiece.

When spraying with electrostatic spraying technology, the paint particles will move in the direction of the electric field line, resulting in small dispersion of paint droplets, and the overall utilization rate of the paint is improved.

At the same time, the electrostatic spraying paint film is uniform and bright, which can cover the outer surface, inner cavity surface and corners of various complex structures of the workpiece, and the spraying and coating quality is better. With the development of efficient and intelligent automobile production lines, high-efficiency spraying technology is often used in large-scale assembly line operations of workshop body painting.

In addition, due to the special working principle of electrostatic spraying technology, a high degree of automation is required, which makes the environmental requirements of the electrostatic spraying workshop relatively high, thus optimizing the production and working environment of operators.

Summary. Hello, electrostatic spraying is called plastic spraying, and its principle is to use the corona discharge phenomenon to adsorb the powder coating on the workpiece.

The process is as follows: the powder coating is sent to the spray gun by the powder supply system by compressed air gas, the high voltage generated by the high-voltage electrostatic generator is added at the front end of the spray gun, due to the corona discharge, a dense charge is generated near it, when the powder is sprayed out by the nozzle, the charged coating particles are formed, it is subjected to the action of electrostatic force, and is sucked to the workpiece opposite to its polarity, with the increase of powder sprayed, the more the charge accumulates, when it reaches a certain thickness, due to the electrostatic repulsion effect, it does not continue to adsorb, So that the whole workpiece can obtain a certain thickness of powder coating, and then the powder is melted, leveled and solidified by heat, that is, a hard coating film is formed on the surface of the workpiece.

What is electrostatic spraying? How does electrostatic spraying equipment work?

Hello, electrostatic spraying is called plastic spraying, and its principle is to use the corona discharge phenomenon to adsorb the powder coating on the workpiece. Here's how it goes:

The powder coating is sent to the spray gun by the powder supply system by compressed air gas, and the high voltage generated by the high-voltage electrostatic generator is added at the front end of the spray gun, due to the corona discharge, a dense charge is generated near it, and when the powder is sprayed out from the nozzle, a charged coating particle is formed, which is sucked to the workpiece opposite to its polarity by the action of electrostatic force, and the more powder is sprayed, the more the charge accumulates, and when it reaches a certain thickness, it does not continue to adsorb due to the electrostatic repulsion effect, So that the whole workpiece can obtain a certain thickness of powder coating, and then the powder is melted, leveled and solidified by heat, that is, a hard coating film is formed on the surface of the workpiece.

There is no small spraying equipment.

You can also find small mortar spraying machine, small airless spraying machine, small putty spraying machine, mortar spraying machine, small cement mortar spraying machine and other product information.

Don't have an assembly line, is there a single cabinet spraying equipment?

You can go and see, there are.

I want a small electrostatic paint sprayer. Have it?

Electrostatic spraying painting is different from the previous spray painting, usually everyone knows manual painting, but with the continuous progress of science and technology, this method has been gradually replaced, What is electrostatic painting?

The principle of electrostatic painting is that the sprayed product is the positive electrode, and the paint atomization device is the negative electrode. The positive electrode is grounded, and the negative electrode is energized to form two electrodes, which atomize the paint and spray out the same sex and attract the opposite sex, and coat the product with a thin protective film, which is electrostatic painting.

The advantage of electrostatic painting compared with the previous manual painting is that the work efficiency is high, and the time of painting can be saved by 40%-50%. For example, the panel industry can use several spray guns together at the same time to improve work efficiency.

Therefore, the bosses of the major spraying industry are making breakthroughs and innovations, and the original manual painting is being reformed.