MANUFACTURING METHOD AND EQUIPMENT FOR THREE-LAYER POWDER-POLYETHYLENE COATED STEEL PIPE BY DIPPING

摘要

The present invention mainly in technology for coating a polyethylene of a powder-like powder deposition type (also known as the powder type) in order to protect the steel pipe outer surface that is used for laying the pipeline from corrosion, after the blasting treatment to improve the adhesion of polyethylene powder suitable I as coating the first powder epoxy drive a steel pipe surface is heated to a temperature to prepare a product having a three-layer coating structure in which a second coating of adhesive powder polyethylene drive and then coating the system layer powder polyethylene to end the coating operation of each coating layer even by enhancing the quality of the coating method and intended to improve the productivity.; Coated steel pipe manufactured by applying the present invention can be used mainly for the purpose of the pipeline is buried underground for a water supply for receiving and general steel pipe, and other pipes.