Paddle dryers are used to dry wet cakes, pastes, and thick slurries like sludge. The hollow paddles and jacket are heated by the flow of the heating medium, such as steam or hot oil, through them. After making contact with the paddles and container wall, the moist material dries.The paddles’ shape prevents product sticking and makes them self-cleaning. The moisture is removed from the product as it travels from one end to the other. Thermal fluid or steam is often used as the heating medium.