ratio of magnet of larger thickness versus gaps of smaller thickness provide higher magnetic intensity rare earth permanent magnet having in their composition 52 of neodymium besides iron and boron the magnetic saturation level is directly proportional to the amount of neodymium the magnetic roll is of the permanent type of high intensity high gradient built with superpotent neodymium magnets resistant to temperatures of up to 80 u00b0 c and steel disc of high magnetic permeability the actuation of the magnetic roll is effected by means of a complete three phase variable velocity 2 0 hp ac motor with frequency inverter for 220 vca vac 60 hz it may be run on 220 380 440 vac the belt tensioning and aligning system may solve the problem related to the short distance between small diameter rolls of thin belt it is possible to replace the belt in a few minutes without the need for special tools the employed three guide systems enable the tensioning and alignment of the belt thus extending its lifetime a separation belt of the type of polyester fabric coated with pu polyurethane layer with 0 6 1 00 mm thickness roller type feed system with a 2.