Abstract: The coating of impregnated plastic powder is a common coating process, which has a wide range of applications. Electrostatic spraying is an important step in the coating process of impregnated plastic powder, and its spraying principle and optimization method are very important to improve the coating quality and efficiency. This paper will analyze the principle of electrostatic spraying, and put forward some optimization methods to help improve the effect of impregnated plastic powder coating.
1, electrostatic spraying principle
Electrostatic spraying is a method of spraying impregnated plastic powder to the surface of the coated object by electrostatic force. The principle is to bring static charge to the impregnated powder through a high voltage static power supply, and then spray the charged impregnated powder particles to the coated object through the nozzle. Since the coated object is usually grounded, the electrostatic charge will cause the impregnated powder particles to be adsorbed on the surface of the coated object to form a uniform coating. One of the keys to electrostatic spraying is to control the amount of charge and speed of spraying to ensure the thickness and uniformity of the coating.
2. Optimization method
(1) Adjust spraying parameters: spraying parameters have a great impact on the effect of electrostatic spraying. For example, adjusting the spray Angle and distance of the nozzle can control the spray distribution range and uniformity; The amount of static charge can be controlled by adjusting the spraying voltage and current. The thickness of the coating can be controlled by adjusting the spraying speed. By accurately adjusting these parameters, the ideal spraying effect can be obtained.
(2) Optimize nozzle design: nozzle is a key component in electrostatic spraying, and its design has an important impact on the formation and distribution of spray. Optimizing the internal structure of the nozzle and the shape of the spray hole can improve the uniformity and efficiency of the spray. For example, the use of atomizing nozzles can produce fine particles to improve the spraying effect; Uniform spray coverage is achieved with a rotating nozzle.
(3) Improve the adhesion of the coating: the adhesion of the coating is crucial to the coating effect and durability. In order to improve the adhesion of the coating, some technical means can be used. For example, the surface treatment of the coated object before spraying, such as cleaning, dust removal, grinding, etc.; The amount of electrostatic charge and spraying speed should be properly adjusted during the spraying process to ensure good contact between the coating and the coated object.
(4) Control spraying environment: spraying environment also has a certain impact on the effect of electrostatic spraying. In the spray process, should try to avoid the interference of dust, humidity and temperature and other adverse factors. At the same time, ensure that the spraying equipment is in good working condition and the nozzle is clean and unblocked to ensure the stability and consistency of spraying.
Electrostatic spraying is an important step in the coating process of impregnated plastic powder, and its spraying principle and optimization method are very important to improve the coating quality and efficiency. By adjusting the spraying parameters, optimizing the nozzle design, improving the coating adhesion and controlling the spraying environment, the ideal spraying effect can be obtained, and a better solution can be provided for the coating of impregnated plastic powder.
