Moulds are made in two parts so that the roll neck and the body gain different mechanical properties. A metal section that cools quickly and produces a hard structure is used for the body, while moulds lined with resin-coated sand, which bring out high mechanical properties and cool slowly, are used for the necks. Sand moulds are prepared with a sand mixer of 10 tons/hour and a sand reclamation system of 6 tons/hour.