In extrusion, a heated aluminium billet is pressed through a die under high pressure, which gives the profile its shape. That's the process. But before that, after the profile has been developed on the drawing board, the dies have to be manufactured.
We have a die-producer within our own group: Expa in Eupen (just 10 km from Raeren). This guarantees consistent top quality.
By the way, do you know that the cost of extrusion Dies for aluminium is much lower than that for many other materials?