How the 7/40 Single Wall Corrugated Pipe Machine Operates. This machine forms corrugated pipes through a continuous extrusion and forming process. Thermoplastic material (like HDPE or PP) is melted in the extruder and pushed through a die head into a corrugator block system. The forming section uses vacuum or pressure-assisted molds to shape and cool the pipe uniformly. The result is a high-strength, single-wall corrugated pipe.Key Features of ... Continue