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Inner and outer plastic-coated composite steel pipe
Plastic-coated composite steel pipe, also known as plastic-coated steel pipe, is a steel-plastic composite product with steel pipe as the base pipe and plastic powder as the coating material. A plastic layer is melted and coated on its inner surface, and a plastic layer or other material anti-corrosion layer is coated on its outer surface.
Key words:
Inner and outer plastic-coated composite steel pipe
Classification:
Description
Plastic-coated composite steel pipe, also known as plastic-coated steel pipe, is a steel-plastic composite product with steel pipe as the base pipe and plastic powder as the coating material. A plastic layer is melted and coated on its inner surface, and a plastic layer or other material anti-corrosion layer is coated on its outer surface.
Coated composite steel pipes are classified into: hot-dip plastic coating process, internal and external spraying process, rotational molding process, dip coating process, suction coating process, fusion winding process, etc.
Hot-dip plastic coating adopts: fluidized bed plastic coating, one-time film formation method. Also known as the first-generation anti-corrosion of plastic-coated steel pipe, it is made of polyethylene both inside and out.
Internal and external spraying process: Based on the electrostatic adsorption theory, through the pretreatment of steel pipes, polyethylene or epoxy resin powder is sprayed with a spray gun. Also known as the second-generation anti-corrosion coated steel pipe, it is an inner and outer epoxy composite steel pipe.
Coating process: Also known as the curtain method, it is applied to the outer wall of the heated steel pipe by coating through a sieve filled with powder. As shown in the figure:
This process can produce outer polyethylene and inner epoxy composite steel pipes. Also known as the third-generation anti-corrosion of plastic-coated steel pipes.
Fusion-bonded winding process: The hot fusion-bonded winding method is adopted. Hot melt adhesive and polyethylene are wound around the heated steel pipe in the form of an extruder, and a reaction occurs to form a three-layer structure. The full name is fusion-bonded epoxy/extruded polyethylene structural protective layer. As shown in the figure:
This process can produce polyethylene composite steel pipes with an outer three-layer structure and an inner fusion-bonded epoxy structure. Also known as the fourth-generation anti-corrosion of plastic-coated steel pipes.
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