Pipe Extrusion is a converting technique for the mass production of pipes. The molten polymer is extruded through an annular die which determines the wall thickness through a calibration device to fix the pipe width. Instead of a calibrator also a corrugator can be used to produce corrugated pipes but using a vacuum in the mould blocks.
Typical pipe diameter can range from less than 10 up to 2000 mm with a wall thickness from millimeters up to more than 1000 millimeters.
Polyethylene (PE) and polypropylene (PP) are widely used resins for pipe extrusion.