Exclusive Features of Lab Sigma Mixer
- Available in Stainless Steel 316, Stainless Steel 304 and Mild Steel materials.
- Stainless Steel polish to matt & mirror finish as per customer’s requirements.
- Mild Steel finish with one coat of red oxide and two coats of epoxy paint.
- Discharge option of hand wheel operated (manual) or hydraulic operated (automatic) offered.
- Jacket for heating or cooling application can be offered.
- Mineral wool insulation with cladding on jacket.
- Tangential designed ‘Z’ blades offered for uniform mixing.
- PTFE made shaft sealing provided for food grade compatibility.
- Minimum gap between trough inner shell & blades removes possibility of sticking product.
- On demand Spray system, vacuum system
Optional Features/Accessories of Lab Sigma Mixer
- Liquid Spray System
- Vacuum System
- Blades Cooling Arrangement
- Screw System
- Automatic Valve Discharge System
Working Principle of Lab Sigma Mixer
In Sigma mixer tangential action of mixing and kneading obtained by ‘Z’ type (SIGMA) shaped kneading blades, which rotates very accurately at different speed towards each other causing product to be transferred from one end to another end. Discharge of the finished product is achieved by tilting the container or through the valves at the bottom or by means of an extrusion screw beside the container.
The mixing action is a combination of bulk movement, stretching, folding, dividing, and recombining of the material. The shearing & tearing action of the material against blades and the side walls causes size reduction of the solids. After the time period required for sterilizing the batch has elapsed, the heating circuit shuts of the pneumatic damper (exhaust) opens and cooling operation commences.
In the tangential design, the blades rotate in the trough meeting tangentially. The front blade generally rotates faster than the rear blade usually in the ratio of 3:2. Tangential blades are generally used for material of higher viscosity such as adhesives, rubber compounds, flush colors, dyes, and pigments.
In the overlapping design, the blades overlap above the saddle of the container. Due to the overlapping action, it is necessary that the relative position of the two blades is unchanged, and as a result, both the blades rotate at the same speed. Materials that flow freely or creep down into the blades are mixed using the overlapping blade action. This design offers a faster interchange of material from one blade compartment of the mixer to the other. Overlapping blade action is used for materials of lighter viscosity such as carbon pastes, clay coating, creams, and ointments. The overlapping blade produces a lower kneading and shearing compared to the tangential blade action.