Steel skeleton plastic composite pipe: the steel mesh welding and plastic extrusion are synchronized. The internal and external plasticity of the pipe wall is in the middle of the pipe wall through the metal mesh holes. There is no obvious interface between the steel wire and the plastic. The overall structure is similar to the reinforced concrete. The two materials are completely combined, and the quality of all parts of the pipe is the same and stable.
Steel wire mesh plastic (polyethylene) composite pipe: first extrude the inner plastic, then apply a layer of hot melt adhesive on the outer wall of the molded inner plastic pipe, then wrap the steel wire, and then apply a layer of hot melt adhesive. The invention relates to a multiple forming method for extruding the outer layer of plastics. There is an obvious interface between the pipe layers, which is easy to delaminate. After layering, the steel wire winding layer in the steel pipe is separated from the plastic layer, which will cause serious corrosion to the steel wire layer when the corrosive medium is transported.
The pressure bearing main body of the steel pipe is damaged. Because the pressure bearing capacity of the remaining plastic part of the steel wire layer is very low, even under low pressure, pipe explosion may occur. Even if there is no corrosion problem, because the steel wire at the end of the steel pipe is not fixed (the bonding effect is not good), the steel wire will slide between the plastic layers under pressure, resulting in no steel wire reinforcement at the end of the pipe. It becomes a pure plastic pipe with thin local walls. Difference between steel mesh skeleton composite pipe and steel skeleton plastic composite pipe.
Steel skeleton plastic composite pipe: the inner and outer layers of the pipe wall are connected through the metal mesh in the middle of the pipe wall (such as reinforced concrete structure). These two materials are completely composite, because the surface of steel wire is very smooth. The plastic has no edges and corners, the flow resistance is small, the extrusion is even, and the quality of pipe fittings is even and stable. As it is welded to a grid structure, the grid spacing of the skeleton is the same, the structure is stable, and it has a strong supporting effect on the plastic.
