The rotor of the vertical thin film processors Filmtruder and Viscon mechanically generates a thin product film on the inner wall of the heated body. The intensive surface renewal creates excellent conditions for heat and mass transfer and produces a high level of devolatilisation.

The design and arrangement of the rotor blades enable the transport and discharge of viscous products. The large free vapour space compared to the low product hold-up allows a high evaporation ratio in a single pass without the risk of any product being carried into the condensation system.