Tuesday, August 21st, 2012

Spray Gun Positioning All powder coating processes necessitate the powder, suspended in its air flow, being as close as possible to the object. The force of electrostatic attraction between powder particles and the object decreases by the square of the distance between them (D2), and only when that distance is just a few centimeters will the powder be drawn towards the object. Careful positioning of the spray gun also assures that small and large particles are deposited on the objectRead More …

Friction Charging (Tribostatic Charging) which generates an electrostatic charge on the powder as it rubs against an insulator Powder particles are friction charged as a result of the motion caused by each particle rubbing rapidly against a special type of insulating material which lines the barrel of the spray gun. Between the friction charging spray gun and the object, as the diagram illustrates, we have present primarily: With friction charging, there exists no high voltage which can subsequently generate freeRead More …

Conventional Electrostatic Charging (Corona Charging) by passing the powder through a high-voltage electrostatic field. High voltage (40-100 kV) concentrated at the nozzle of the spray gun causes ionizing of the air passing through the spray gun. Passage of the powder through this ionized air then allows free ions to adhere to a proportion of the powder particles whilst simultaneously applying a negative charge to them. Between the electrostatic spray gun and the object being coated, the following are present: ItRead More …

Today, practically all powder coatings are applied using an electrostatic spraying process. A common factor with all such processes is that the powder particles are electrically charged whilst the object requiring coating remains earthed. The resultant electrostatic attraction being adequate to allow the build-up of sufficient film of powder on the object, thus holding the dry powder in place until melting occurs with subsequent binding to the surface. Powder particles are electrostatically charged using one of the following techniques: ConventionalRead More …

The main parameters affecting the utilization of electrostatic spraying comprising: the type of nebulizer, the level of electrostatic spray parameters, the conductive,etc. Businesses use spray equipment decided to paint utilization factors, has a very different because of the different paint spraying equipment utilization. Nebulizer paint utilization of mainstream spraying equipment and childhood to greatly: Ordinary air gun, Electrostatic air spray gun Spinning cup Second, spraying environment for the utilization of paint, such as the presence or absence of and electrostaticRead More …