Hot Dip Coating Process: Utilizing fluidized bed dipping, this one-step film formation method is also known as anti-corrosion treatment for steel-plastic composite pipes, with polyethylene applied both inside and outside.
Internal and External Spray Coating Process: Based on the theory of electrostatic adsorption, a spray gun is used to apply polyethylene or epoxy resin powder onto the pretreated steel pipe, forming an internal and external epoxy composite steel pipe.
Curtain Coating Process: Also known as the curtain method, this process involves sprinkling powder through a sieve onto the heated outer wall of the steel pipe, resulting in an external polyethylene and internal epoxy composite steel pipe.
Fusion Bonding and Winding Process: Employing the hot fusion bonding and winding method, hot melt adhesive and polyethylene are wrapped around the heated steel pipe, forming a three-layer protective layer, namely, the fusion-bonded epoxy/extruded polyethylene structural protective layer.
