Sigma Mixer Extruder

Once the material is homogeneously mixed, the extrusion screw (single or twin) at the bottom activates and pushes the product out through a die or nozzle. This enables precise forming and direct feeding into downstream equipment such as pelletizers, calendars, or tubing lines while reducing downtime and labor.

It is designed for very high-viscosity, sticky, or dough-like materials, typically up to 10–20 million cP. Tangential blade designs are especially suited for the highest viscosities (e.g., adhesives, rubber compounds, pigments), while overlapping designs work well for lighter pastes and creams.

The machine features a jacketed trough for heating (steam or hot water) or cooling (chilled water). Optional mineral wool insulation with cladding and blade cooling arrangements provide precise temperature management, making it suitable for temperature-sensitive formulations.

Units are available in Stainless Steel 316, Stainless Steel 304, or Mild Steel. Stainless steel versions can be finished in matt or mirror polish per customer requirements. Mild steel models receive a red oxide primer plus two coats of epoxy paint. PTFE shaft seals ensure food-grade compatibility.

Options include hand-wheel operated (manual) or hydraulic (automatic) tilting of the trough, bottom valves, or the integrated extrusion screw. These choices allow efficient, complete product removal with minimal operator intervention and reduced risk of material stagnation.

Yes. Optional vacuum systems remove trapped air for denser, bubble-free output, while spray systems can be added for liquid addition during the process. Other customizable features include variable frequency drives (VFD), automatic valve discharge, and specialized sealing or feeding mechanisms.

Working capacities range from approximately 50 liters (ASM-50) to 3000 liters (ASM-3000), with corresponding gross capacities. Motor power spans from 5 HP (general duty) up to 120 HP (heavy duty), and voltage can be customized to match local power requirements.

It is widely applied in the pharmaceutical, nutraceutical, herbal, Ayurvedic, biotech, cosmetic, and chemical industries for processing high-viscosity products such as ointments, creams, pastes, adhesives, rubber compounds, dyes, pigments, and specialty formulations.

Two counter-rotating Z-shaped sigma blades operate with close clearances to the trough walls. Tangential designs rotate at different speeds (typically a 3:2 ratio) for intense shearing and folding of high-viscosity materials, while overlapping designs rotate at equal speeds for faster material interchange in lower-viscosity products. Both create continuous bulk movement, stretching, folding, dividing, and recombining actions.