Sigma Mixer, Frequency : 50 Hz

This article details the design, construction and operation of  Sigma Mixercommonly used for mixing of high viscosity materials. The industrial applications for which Sigma Mixer is used are listed.

Media : Solid Powders, Dough, Viscous Paste

Mode of Operation : Batch Mixing

Design and Operation

Mixing Vessel - The sigma mixer consists of a W-shaped horizontal trough containing two sigma shape mixing blades rotating within.

Mixer Blades - The clearance between the external periphery of the blades and the internal wall of the mixing vessel is generally in the range of 2 – 3 mm. The clearance may be higher depending on the properties of the materials being mixed.The two blades are positioned tangentially or may overlap each other.

In the tangential blade sigma mixer, the blades rotate in the mixing vessel meeting tangentially. The front blade generally rotates faster than the rear blade. The ratio of rotation speeds depends on the application. Tangential blade design is user for mixing of viscous materials.