OTX, Original Thermal eXchanger changes the concept of hopper. Exclusive solutions make them a real paradise for drying, in which the granule is treated in a delicate and uniform manner, with no stagnant areas causing overpressure phenomena. The revolutionary GEOMETRY, a result of long studies and sophisticated thermodynamic simulations, gives OTX the ability to deliver granules with adequate and uniform residual humidity, at much shorter times than traditional hoppers.