What is the electrostatic gun spraying method for plastic-coated steel pipes

the outer coating of ep powder is mostly sprayed with an electrostatic gun.

in electrostatic gun spraying, when spraying, the powder is electrostatically generated under the action of the electrostatic generator, so that the powder is adsorbed on the steel pipe. the coating is dense and the quality is reliable. this method is the current coating method. however, in this way, a powder recovery system is required to collect the over-sprayed powder. electrostatic gun extension rod spraying is based on the former plus a long rod, which is mainly used for internal coating and can only be sprayed with powder when it penetrates into the steel pipe.