Food Grade Sigma Mixer

It is primarily built with food-grade Stainless Steel 304 or 316 for all product-contact surfaces to ensure hygiene and corrosion resistance. Polishing options include matt or mirror finish. Mild Steel is also available for non-contact parts with red oxide and epoxy paint. PTFE shaft seals are provided for food-grade compatibility.

The mixer features two ‘Z’ (sigma) shaped blades that rotate at different speeds (typically 3:2 ratio in tangential design) in a U- or W-shaped trough. This creates a combination of bulk movement, stretching, folding, dividing, recombining, shearing, and tearing for uniform mixing of viscous materials without dead zones. Tangential blades suit higher viscosities, while overlapping blades work well for lighter ones.

Models range from lab/pilot scale to large production units. Examples include ASM-50 (50L working / 80L gross) up to ASM-3000 (3000L working / 3800L gross), with motor power from 5 HP to 120 HP depending on the model and duty (general or heavy duty). Custom capacities are possible.

Yes. Optional jacketed troughs with mineral wool insulation and cladding allow precise heating or cooling (using steam, hot oil, or water). This is essential for products like chocolate, caramel, or yeast doughs to maintain optimal consistency during mixing.

Discharge can be achieved via hand-wheel operated (manual) tilting, hydraulic operated (automatic) tilting, bottom valves, or an optional extrusion screw. Hydraulic systems often include reverse blade rotation for complete and efficient emptying of viscous materials.

Key hygiene features include polished stainless steel surfaces, minimum gap between trough and blades to prevent product sticking, PTFE seals, and optional CIP (Clean-In-Place) systems. The design prioritizes compliance with global food safety standards and easy maintenance.

While optimized for food production (dough, confectionery, sauces, pastes), it is also widely used in Pharmaceutical, Nutraceutical, Herbal, Ayurvedic, Biotech, Cosmetic, and Chemical industries for processing high-viscosity formulations requiring uniform dispersion and hygiene.

Available options include liquid spray systems, vacuum systems for de-aeration, blades cooling arrangement, screw/extrusion systems, automatic valve discharge, variable speed drives, and more. These enhance efficiency, safety, and suitability for specific food processing needs.

Tangential ‘Z’ blades (different speeds) provide high shear for higher-viscosity sticky materials. Overlapping blades (same speed) offer faster material interchange for lighter viscosities. A minimum gap design prevents sticking, ensuring thorough mixing across various food-grade applications.