General Machine top driven stage screens are made in 3 stages. The slope of the rear stages of material flow rate is too high. Though this high-speed all material would have the opportunity to contact with mesh screen. The thin material is easily eliminated at this stage. The midrange is the classic screen slope gradient. The slope of the front stage screen is reduced and it is supplied to increase performance of screen .Though these 3 stages , screen capacity is more 30% accordig to the same size screen. It is called banana screen too.