The method
When manufacturing aluminium profiles, a billet heated to the forming temperature of approx. 500 °C is pushed through a mould with an extrusion die. A recipient encloses the billet. The outer shape of the extruded profile is determined by the mould.
Mandrels shaped in various ways make the production of hollow spaces and multi-chamber profiles possible as well. The extruded profiles of lengths up to 55 meters, are then stretched, sawed to manufacturing lengths, and then generally aged artificially in order to increase stability.