

A food grade sigma kneader, also commonly known as a sigma mixer, Z-blade kneader, double-arm sigma blade mixer, or sigma blade kneader, is a robust industrial mixing machine specifically engineered for intensive kneading, blending, and homogenizing of high-viscosity, semi-solid, and dough-like materials. Designed with strict hygiene standards in mind, these machines play a critical role in modern food processing industries where consistent texture, uniform mixing, and food safety are non-negotiable.
Food grade sigma kneaders are constructed using high-quality stainless steel (typically SS 304 or SS 316) that meets FDA, GMP, and other international hygiene certifications. Unlike standard industrial mixers, every surface that comes into contact with food is polished to prevent bacterial buildup, corrosion, and contamination. The unique Z-shaped sigma blades (or double-arm blades) rotate in opposite directions at different speeds, creating a highly efficient folding, stretching, and shearing action that ensures thorough mixing even for extremely sticky or viscous products.
This heavy-duty design allows the machine to handle materials with viscosities far beyond the capability of conventional planetary mixers or ribbon blenders. Whether you are producing large batches of bread dough, cookie dough, biscuit dough, chewing gum base, chocolate paste, confectionery fillings, or protein bars, a food-grade sigma kneader delivers consistent results batch after batch.
Functional Mechanics & Blending Principles
Unloading Alternatives
Processed batches can be evacuated using any of the following discharge pathways:
Blade Architectures & Industry Applications
Tangential Blade Arrangement
Overlapping Blade Arrangement
Model | Capacity – Liters | Motor (H.P.) | ||
Working Capacity approx. | Gross Capacity approx. | General | Heavy Duty | |
ASM – 50 | 50 Liters | 80 Liters | 5 H.P. | 7.5 H.P. |
ASM – 75 | 75 Liters | 110 Liters | 7.5 H.P. | 10 H.P. |
ASM – 100 | 100 Liters | 150 Liters | 10 H.P. | 15 H.P. |
ASM – 150 | 150 Liters | 200 Liters | 15 H.P. | 20 H.P. |
ASM – 200 | 200 Liters | 300 Liters | 20 H.P. | 25 H.P. |
ASM – 400 | 400 Liters | 550 Liters | 30 H.P. | 40 H.P. |
ASM – 500 | 500 Liters | 750 Liters | 40 H.P. | 50 H.P. |
ASM – 750 | 750 Liters | 1150 Liters | 50 H.P. | 60 H.P. |
ASM – 1000 | 1000 Liters | 1500 Liters | 60 H.P. | 70 H.P. |
ASM – 1500 | 1500 Liters | 2100 Liters | 75 H.P. | 80 H.P. |
ASM – 2000 | 2000 Liters | 2600 Liters | 80 H.P. | 90 H.P. |
ASM – 3000 | 3000 Liters | 3800 Liters | 100 H.P. | 120 H.P. |
* Power voltage can be adjusted as per customer’s domestic power voltage requirements.
* Rights of technical improvements & modification reserved.
* Illustrations & dimensions are shown for information purpose only.
The Food Grade Sigma Kneader excels at processing high-viscosity, semi-solid, and dough-like materials such as bread dough, cookie dough, biscuit dough, chewing gum base, chocolate paste, confectionery fillings, protein bars, sauces, and specialty pastes. Its powerful shearing and kneading action ensures uniform texture and consistency even for extremely sticky products that standard mixers cannot handle effectively.
Tangential ‘Z’ blades rotate at different speeds (typically 3:2 ratio) and are ideal for higher-viscosity sticky materials, providing strong shearing and kneading. Overlapping blades rotate at the same speed and offer faster material interchange, making them suitable for lighter viscosities like creams or ointments. Both designs minimize dead zones for thorough mixing.
The optional jacketed trough with mineral wool insulation supports precise heating or cooling using steam, hot oil, or water. This is crucial for temperature-sensitive products like chocolate, caramel, or yeast-based doughs, helping maintain optimal consistency, prevent scorching, and control processing conditions throughout the batch.
It is constructed with FDA and GMP-compliant materials, including food-grade stainless steel (SS 304 or 316) for all product-contact surfaces. Features like polished finishes, PTFE seals, and minimum blade-to-trough gaps help prevent contamination, bacterial buildup, and ensure full adherence to international hygiene and food safety regulations.
Discharge options include manual hand-wheel tilting, hydraulic automatic tilting (with reverse blade rotation for efficiency), bottom valves, or extrusion screws. Combined with mirror-polished surfaces, minimal gaps to reduce sticking, and food-compatible seals, the design supports quick and thorough cleaning, often compatible with optional CIP systems.
Yes. Customization options include liquid spray systems, vacuum systems for de-aeration, blade cooling arrangements, screw/extrusion discharge, variable speed drives, different polishing levels (matt or mirror), and power voltage adjustments. Lab-scale (5–10L) to large production models (up to 5000L) are available.
Models range from ASM-50 (50L working capacity, 5–7.5 HP) to ASM-3000 (3000L working capacity, 100–120 HP), with general and heavy-duty variants. Gross capacities are higher (e.g., 80L to 3800L). Power voltage can be customized to local requirements.
It handles viscosities in the millions of centipoise with intensive kneading, folding, stretching, and shearing action that conventional mixers cannot match. The robust Z-blade design, hygienic stainless steel construction, and optional temperature control make it superior for consistent, high-quality food production.
Yes. While optimized for food, it is also used in Pharmaceutical, Nutraceutical, Herbal, Ayurvedic, Biotech, Cosmetic, and Chemical industries for high-viscosity formulations requiring uniform dispersion, hygiene, and reliable processing.
Key features include corrosion-resistant stainless steel, PTFE shaft seals, polished surfaces for easy cleaning, sturdy construction, and optional insulation/cladding. The minimum gap design reduces product buildup, while robust drive systems and customizable components support reliable, low-maintenance operation in demanding production environments.
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Connect with our engineering team to discuss your specific production requirements. We provide customized, cGMP-compliant machinery solutions designed to optimize your manufacturing facility and maximize output.
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