Double Arm Sigma Mixer

Description

A Double Arm Sigma Mixer, also widely known as a Double Sigma Blade Mixer, Double Z Blade Kneader, or Sigma Kneader Mixer, is a robust industrial mixing machine engineered for intensive kneading, blending, and processing of high-viscosity, sticky, and dense materials. This powerful equipment stands out in the manufacturing world for its ability to handle substances that conventional mixers simply cannot manage effectively.

At the heart of the Double Sigma Blade Mixer are two specially designed sigma-shaped (Z-like) blades that rotate in opposite directions within a U-shaped or trough-like mixing bowl. These interlocking blades operate at different speeds, creating a unique combination of shear, folding, and stretching actions. One blade typically moves faster than the other, generating intense material movement — pushing the product from the sides to the center and back again. This continuous back-and-forth flow ensures thorough mixing, uniform distribution of ingredients, and excellent dispersion of additives.

The counter-rotating motion produces powerful shear forces that break down agglomerates, eliminate lumps, and create a homogeneous final product. The sigma blade design is particularly effective for heavy-duty applications because it maximizes contact between the blades and the material while minimizing dead zones in the mixing chamber.

Typical Construction

Heavy-duty fabricated trough, usually jacketed for heating/cooling (steam, hot oil, or water).
Materials of construction: Carbon steel, SS 304, SS 316/316L, special alloys, or with anti-stick coatings (PTFE, hard chrome, etc.).
Hydraulic tilt or bottom discharge valve for easy unloading.
Optional vacuum or pressure capability, extrusion screw discharge, and explosion-proof design.

Salient Features of Double Arm Sigma Mixer

Built from robust industrial alloys, including SS 304, high-grade SS 316, and carbon-based Mild Steel.
Stainless steel surfaces can be customized with either a satin brushed look or a brilliant mirror polish based on exact customer preferences.
Carbon steel components receive thorough rust prevention via a primary coat of red oxide primer sealed by two independent layers of epoxy paint.
Batch evacuation can be performed through manual hand-wheel controls or fully automated hydraulic mechanisms.
Outer heating/cooling chambers are securely wrapped in mineral wool thermal blankets and sealed with protective metallic sheet cladding.

Optional thermal jackets are available to accommodate external heating or chilling operations.
Configured with precision-engineered tangential 'Z'-profile blades to guarantee smooth, homogeneous product blending.
Fitted with PTFE shaft packings to ensure absolute safety, hygiene, and food-grade compliance.
Designed with micro-gaps between the interior trough wall and rotating impellers to completely eliminate dead zones and product buildup.
Customized add-on packages available upon request, featuring targeted liquid atomization spray networks and hermetically sealed vacuum processing chambers.

Working Principle of Double Arm Sigma Mixer

Agitation Dynamics & Thermal Control

Counter-Rotational Amalgamation: Twin Sigma (‘Z’) configuration rotors revolve synchronously at precise, differential speeds toward one another, continuously shifting bulk media longitudinally while executing an intricate cycle of elongation, folding, splitting, and re-fusion.
Particle Diminution: High-stress friction, shearing, and tearing forces generated between the moving impellers and interior chamber boundaries effectively break down solid agglomerates.
Automated Thermal Transitions: Once the required batch sterilization period concludes, the thermal heating circuit deactivates, the pneumatic exhaust valve opens automatically, and the chilling sequence initiates.

Evacuation Pathways

Completed batches can be unloaded through three distinct discharge methods:

Tilting the entire mixing trough
Draining via bottom-situated outlet valves
Extruding through a lateral side-mounted screw mechanism

Agitator Configurations & Application Matrix

Tangential Blade Layout

Operational Setup: Non-intersecting blades revolving side-by-side at unequal velocities, typically maintaining a 3:2 speed ratio (with the lead blade outrunning the rear).
Target Viscosities & Materials: Heavy, high-viscosity formulations including industrial adhesives, rubberized compounds, flush colors, chemical dyes, and dense pigments.

Overlapping Blade Layout

Operational Setup: Intersecting blades crossing above the central vessel ridge, requiring strict phase synchronization and identical rotational speeds to accelerate cross-compartment exchange.
Target Viscosities & Materials: Free-flowing, fluid, or creeping substances such as carbon pastes, ceramic clay coatings, cosmetic creams, and pharmaceutical ointments.
Performance Profile: Delivers a noticeably milder kneading and shearing intensity relative to the tangential configuration.

Technical Specification of Double Arm Sigma Mixer

Model	Capacity – Liters		Motor (H.P.)
Model	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.

Types of Sigma Mixer

Sigma Mixer Machine

Sigma Mixer Extruder

Lab Sigma Mixer

Food Grade Sigma Mixer

Heavy Duty Sigma Mixer Machine

Z Type Sigma Mixer

Applications of Sigma Mixer

Pharmaceutical Industry
Nutraceutical Industry
Herbal Industry
Ayurvedic Industry
Biotech Industry
Cosmetic Industry
Chemical Industry

Advantages of Double Arm Sigma Mixer

Handles extremely high viscosities where other mixers fail

Excellent mixing homogeneity in short time

Self-wiping action keeps material from sticking to walls

Robust and long service life even under severe conditions

Key Features of Double Arm Sigma Mixer

Two counter-rotating sigma blades mounted in a double-trough (W-shaped) mixing bowl.

The blades rotate at differential speeds, with the front blade usually faster than the rear one.

Intensive kneading, shearing, stretching, and folding action ensures excellent dispersion and homogenization even in extremely viscous materials (up to 10 million centipoise).

Tangential or overlapping blade design options:
- Tangential → blades rotate side-by-side (higher speed, more suitable for lower-to-medium viscosity).
- Overlapping → blades intermesh (superior for very high-viscosity and fibrous materials).

FAQ for Double Arm Sigma Mixer

What is a Double Arm Sigma Mixer, and why is it also called a Z Blade or Sigma Kneader?

A Double Arm Sigma Mixer (also known as Double Sigma Blade Mixer, Double Z Blade Kneader, or Sigma Kneader Mixer) is a heavy-duty industrial machine designed for intensive kneading, blending, and processing of high-viscosity, sticky, and dense materials. It features two counter-rotating sigma-shaped (Z-like) blades in a U- or W-shaped trough that provide powerful shear, folding, and stretching actions, making it ideal for materials that standard mixers cannot handle effectively.

How do the tangential and overlapping blade designs differ in a Double Arm Sigma Mixer?

In the tangential design, the Z-shaped blades rotate side-by-side (often at differential speeds like 3:2) and are suited for higher-viscosity materials such as adhesives, rubber compounds, dyes, and pigments, delivering strong kneading and shearing. In the overlapping design, the blades intermesh above the trough saddle at the same speed, enabling faster material interchange for lighter viscosities like creams, ointments, and carbon pastes, though with comparatively lower kneading intensity.

What industries commonly use the Double Arm Sigma Mixer?

It is widely used in the Pharmaceutical, Nutraceutical, Herbal, Ayurvedic, Biotech, Cosmetic, and Chemical industries. It excels at processing dense pastes, creams, ointments, adhesives, rubber compounds, pigments, and specialty formulations that require thorough homogenization.

What are the available capacities and motor options for the Double Arm Sigma Mixer?

Models range from ASM-50 (50L working / 80L gross capacity, 5–7.5 HP) up to ASM-3000 (3000L working / 3800L gross capacity, 100–120 HP). Power voltage can be customized to local requirements, with options for general or heavy-duty motors.

How is temperature controlled during mixing in the Double Arm Sigma Mixer?

The mixing trough is typically jacketed for heating (using steam, hot oil, hot water, or electric) or cooling (chilled water). Mineral wool insulation with cladding enhances efficiency. Optional cored blades or blade cooling arrangements provide additional control for temperature-sensitive materials.

What discharge options are available to handle viscous products efficiently?

Discharge methods include manual hand-wheel tilting, hydraulic automatic tilting, bottom discharge valves, and extrusion screw systems. These options minimize waste and facilitate easy unloading of heavy, sticky materials.

What materials of construction are offered for the Double Arm Sigma Mixer?

Construction options include Stainless Steel 304, Stainless Steel 316/316L, Mild Steel, special alloys, or coatings like PTFE and hard chrome. Stainless Steel finishes can be matt or mirror polish, while Mild Steel uses red oxide and epoxy paint. PTFE shaft seals support food-grade compatibility.

What key advantages does the Double Arm Sigma Mixer offer over conventional mixers?

It handles extremely high viscosities (up to 10 million centipoise) where other mixers fail, delivers excellent mixing homogeneity quickly, features self-wiping action to prevent material sticking, and provides robust, long-lasting performance under demanding conditions with minimal dead zones.

What optional features can enhance the performance of a Double Arm Sigma Mixer?

Popular options include liquid spray systems, vacuum systems, variable frequency drives (VFD), overload protection, screw feeding/discharge, automatic valves, and explosion-proof designs. These allow customization for specific process needs like de-aeration or precise feeding.

How does the Double Arm Sigma Mixer ensure GMP and regulatory compliance?

It supports GMP compliance through high-grade stainless steel construction with smooth, easy-to-clean surfaces (matt/mirror polish), minimal blade-to-trough gaps to prevent product sticking, PTFE seals for food-grade use, jacketed temperature control, and overall hygienic design suitable for pharmaceutical and regulated industries.

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Double Arm Sigma Mixer

Description

Typical Construction

Salient Features of Double Arm Sigma Mixer

Working Principle of Double Arm Sigma Mixer

Technical Specification of Double Arm Sigma Mixer

Types of Sigma Mixer

Applications of Sigma Mixer

Advantages of Double Arm Sigma Mixer

Handles extremely high viscosities where other mixers fail

Excellent mixing homogeneity in short time

Self-wiping action keeps material from sticking to walls

Robust and long service life even under severe conditions

Key Features of Double Arm Sigma Mixer

FAQ for Double Arm Sigma Mixer

Countries We Export to

Partner with Industry Experts

Countries We Export to

Partner with Industry Experts

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