Granulators are machines that form small particles into permanent aggregates to render them into free-flowing state. In Rotating Shape Granulators, the machine shell or the entire mixer shell rotates at a moderate speed around an axis parallel to the ground resulting in the mixing of materials and granulation process. Particle densification and/or agglomeration is by incorporation of a granulating fluid into the powder mix with low-power-per-unit mass through rotation of the containing vessel and/or intensifier of a cylinder and the rotation speed in rpm(revolution per minute) of the vessel is a function of the vessel size.
Although rotating shape granulators may differ from one another as a result of the vessel geometry and the type of dispersion or intensifier bar, no rotating shape granulator subclasses have been identified. Granulators that fall under this category of granulator are;
- Slant cone (slant double cone mixer granulator).
- Double cone (double cone mixer granulator).
- V-blender with intensifier bar.
- Slant V- blender
These rotating shape granulators have some advantages over each other. For instance, the dead space that may occur in double-cone mixer granulator is eliminated in the slant double-cone mixer granulator design.
Advantages of Rotating Shape Granulators
- Minimal shear and attrition during mixing.
- The granulator is easy to clean after use.
- Materials are easily loaded and discharged from the granulator.
- Dilip M. Parikh (2010). Handbook of Pharmaceutical Granulation Technology, Third Edition. CRC Press, Taylor and Francis Group, LLC.
- Jim Litster, and Bryan Ennis (2004). The Science and Engineering of Granulation Processes. Kluwer Academic Publishers, Dordrecht, Netherland.
- Larry, L. A. and Stephen, W. H. (2008), Pharmaceutical Dosage Form: Tablet. CRC Press, Taylor and Francis Group, LLC.