Powder spraying equipment is commonly known as electrostatic powder spraying. Spraying method can be manual, automatic or manual + automatic. Spray material is 100% solid powder, free powder can be recycled, paint recycling rate up to 98%. Suspension transportation system, high degree of automation. The coating has less micropores, good anticorrosive property, and can be coated with thick film at one time.
Electrostatic powder spraying is a coating machine with atomization nozzle (atomizing the coating) and discharge level (electric current) to make the coating particles, apply electric charge to it, form an electric field between the electrode and the coated object, and apply the coating by virtue of its electrostatic adsorption.
Electrostatic powder spraying process appeared in the 1960s, mainly applied to metal surface coating. In the late 1990s, with the development of powder coatings and spraying equipment, it became possible to apply electrostatic powder spraying technology to non-metallic surfaces.
Features of electrostatic powder spraying:
Since the powder coating technology into the coating industry, powder coating in general industrial coatings occupy the market proportion of continuous growth year by year, the reason is that powder coating technology has unique advantages.
Reduce pollution to the environment:
With the increasingly strict regulations of environmental protection law on the content of volatile organic compounds (voc) in the atmosphere, the coating industry has been trying to develop painting technology that is more gentle to the environment. After long-term research and experiments, it was found that "electrostatic powder coating" is the cleanest painting technology that can be achieved at present.
Powder coatings do not use organic solvents, water and other volatile solvents, for inorganic solvent based coatings, which greatly reduces the pollution caused by solvents, including organic solvents caused by the operator's poisoning; It will not cause fire due to organic solvents.
Since the appearance of powder coatings, there have been no major safety accidents caused by powder coatings.
Powder coatings are pure solid components of coatings, can be fully automatic spraying, a large number of or overspray powder, easy to collect by the recovery system, to achieve the purpose of recycling. Therefore, the utilization rate of powder coating is almost 100%, which makes the coating industry reduce the cost of waste disposal and the degree of environmental pollution can be minimized. The economic benefits are remarkable.
In the components formed by coating film, the solvent type is about 60% ~ 65%, while the powder coating can achieve almost 100% efficiency, and the powder that is not attached to the sprayed object can be recycled and reused. In general, the application of powder spraying technology can make the painting operation as economical and effective as possible. In powder painting operations, if there is a poor spraying area, can be used before baking, air gun to blow it out, and then repainting. Because this can avoid surface to flow paint, drop paint to wait for a phenomenon, reduced greatly reapply the odds that rework. Due to the electrostatic spraying operation of powder spraying, coating equipment can almost achieve full automation, saving human resources. Even if the need for artificial assistance, coating personnel do not have to go through long-term training, can master the operation skills. Powder coatings are 100% solid and do not require any solvents, so the amount of coating is reduced, saving packaging and reducing storage space.
Energy saving:
Compared with liquid coatings, the energy cost of powder coatings is greatly reduced because there is no volatile organic matter. Electrostatic spraying equipment can be sprayed in one time to get a thick film, no need for repeated spraying, also do not need to play the primer, than the same film thickness painting operation speed, high efficiency. Painting equipment does not need static time, can save equipment space. In addition, the baking time of powder spraying is shorter than that of liquid coating, so it can greatly reduce the consumption of fuel energy, shorten the coating line, and improve the output and production efficiency.
Excellent coating performance:
As long as the powder coating is directly sprayed on the surface of the pre-treated MDF plate and baked, the coating surface with excellent performance can be obtained. General powder coating has a coating film lasting performance, including abrasion resistance, impact resistance, densification, toughness, corrosion resistance and chemical resistance. Outdoor powder coatings, in addition to the above advantages, also include high weather resistance and pollution resistance. Powder coating can be sprayed in one time to obtain a high thickness coating film, film thickness can be between 50-300 m, and no solvent coating thick dripping or deposition phenomenon occurs.
Process flow of electrostatic powder spraying:
Use electrostatic powder spraying equipment (electrostatic spraying machine) to spray the powder coating to the surface of the workpiece, under the electrostatic effect, the powder will be uniform adsorption on the surface of the workpiece, forming a powder coating; The powder coating is baked at high temperature, smoothed and solidified to become the final coating with different effects (different kinds of effects of powder coating).
