Agitated Thin Film Dryers are used to dry liquid solutions or slurries into flakes or powder. Agitated thin film dryer consists of a jacketed vertical shell having an agitator shaft mounted with multiple blades on it. Either steam or hot oil is passed through the jacket of the shell thereby heating the internal surface of the shell to required tem perature. The liquid feed is introduced at the top and the dry product is discharged at the bottom.
The wet product is fed to the dryer at one end and travels to the other end while it comes in contact with hot surface of paddles and container and gets dried. The dry product is discharged at the bottom from the paddle dryer. For heat sensitive products or for products having solvent in them the paddle dryer is operated under vacuum.