A Sigma Mixer Machine - In-India
Sigma Mixer is an industrial mixing machine designed for blending and kneading highly viscous materials, pastes, and dough-like substances. It features two specially designed Sigma-shaped blades that rotate inside a semi-cylindrical trough, ensuring thorough mixing, shearing, and kneading of materials.
It is widely used in industries like pharmaceuticals, chemicals, food, rubber, and adhesives to process heavy and sticky materials that cannot be mixed by conventional mixers.
Components of Sigma Mixer
1. Mixing Chamber (Trough)
A U-shaped or W-shaped container where materials are loaded for mixing.
Made of stainless steel (SS) or mild steel (MS) depending on application requirements.
2. Sigma Blades
Two strong, interlocking Sigma-shaped blades that rotate at different speeds.
One blade rotates faster than the other, ensuring effective kneading and mixing.
3. Drive Mechanism
Includes a motor, gearbox, and speed reducers to control the blade movement.
Typically operates on an electric motor with variable speed settings.
4. Jacketed or Non-Jacketed Design
Some models have a jacketed trough for heating or cooling during the mixing process.
Used for applications where temperature control is needed (e.g., food, chemicals).
5. Tilting Mechanism
The trough can be tilted manually or hydraulically to discharge the mixed material.
Ensures easy removal and cleaning of the machine.
6. Discharge System
Can be a bottom valve or tilting mechanism for material removal.
Some models have a screw-type or extrusion discharge system for highly viscous products.
Working Process of Sigma Mixer
Step 1: Loading the Materials
Raw materials (powders, pastes, resins, or dough) are loaded into the mixing trough.
If heating or cooling is needed, temperature settings are adjusted.
Step 2: Mixing & Kneading
The Sigma blades start rotating in opposite directions at different speeds.
The material is pushed, pulled, folded, and stretched between the blades and the trough walls.
This process ensures homogeneous mixing, dispersion, and kneading.
Step 3: Temperature Control (If Required)
In jacketed Sigma Mixers, heating or cooling is applied via steam, hot oil, or water circulation.
This step is essential for thermoplastic materials, food doughs, or chemical reactions.
Step 4: Mixing Completion
The mixing process continues until the material reaches the desired consistency and uniformity.
The time varies depending on the material type and viscosity (typically 15-60 minutes).
Step 5: Discharging the Material
The mixed material is discharged by tilting the trough or through a bottom valve.
In some models, a screw or extrusion system helps push out thick materials.
Step 6: Cleaning & Maintenance
The machine is cleaned after each batch to prevent contamination.
Some mixers have a removable blade design for easy cleaning.
