In a disc granulator, the balled materials are continuously discharged from the disk and new materials are added into the feeding tray, repeating the process until the powdery materials become spherical products.
The particles form spherical particles by agglomeration, and as they increase in size, they move up to the circular disc in rotation. Finally they roll to the edge. The small particles initially roll near the bottom edge of the circular disc.
During the rolling granulation process, due to the influence of gravity, the spherical particles make circular motion.
Klatt’s experiments in 1958 showed that the finer the solid, the more uniform the liquid that is sprinkled in, the better the granulation. The smaller the droplets of material, the smaller the diameter of the granules, and the lower yield. Conversely, the denser the droplets, the more granules, and the higher the yield. Besides, the feed rate can control the granulation temperature.