Extrusion molding is a continuous plastic processing technique. The process involves heating, melting, and plasticizing plastic raw materials in an extruder, then continuously extruding the melt through a rotating screw from a die head with a specific shape. It is subsequently cooled and shaped into products with a constant cross-sectional profile. This method offers high production efficiency and is primarily used for manufacturing pipes, sheets, films, profiles, and wire and cable coatings.