Vacuum roller dryer

Roller dryers are used for the thermal solid-liquid separation of solutions and suspensions of various consistencies and viscosities with low to high solid contents.

In particular, sticky products and products with a tendency to adhere, which cannot be processed with other drying methods, can be dried very well with this technique.

Free-flowing products or materials containing solids larger than approx. 50 µm are not suitable for roller dryers. In the roller dryer, the input product is continuously distributed in a uniformly thin layer onto the heated rollers using a special distribution device. During the constant rotation of the rollers, the liquid part of the product evaporates. The solid, dried portion is separated from the roller by the adjacent scraper blades and, depending on the design, is collected in a collecting container or continuously discharged.

The product chamber is under a vacuum, enabling particularly gentle and energy-saving drying thanks to lower boiling points in the vacuum and short dwell times on the hot rollers.