The Double Z Arm Vacuum Sigma Blade Soap Mixer (often referred to as a Sigma Kneader or Z-Blade Mixer) is a specialized industrial mixing machine designed for intensive kneading, blending, and homogenizing of highly viscous, pasty, or semi-solid materials. It’s particularly effective for soap production, where it handles thick soap bases, pastes, and formulations that require thorough mixing without air incorporation—achieved through its vacuum capability. The “double Z arm” refers to the two interlocking Z-shaped (or Sigma-shaped) blades that rotate in opposite directions, creating strong shear forces for uniform results. This design is common in the cosmetics, chemical, pharmaceutical, and food industries, but it’s optimized for soap making due to its ability to process sticky, high-viscosity mixtures like glycerin-based soaps, detergents, or specialty bars.
Double Z Arm Vacuum Sigma Blade Soap Mixer Video
Key Features
-
Blade Design: Two parallel Z-shaped or Sigma blades rotate at differential speeds within a W- or U-shaped trough. This ensures material is repeatedly sheared, folded, and transferred between blades for homogeneous mixing.
-
Vacuum System: Operates under vacuum to remove air bubbles, prevent oxidation, and improve product stability—crucial for soap to achieve a smooth texture and longer shelf life.
-
Capacity Range: Available from lab-scale to production-scale, making it versatile for R&D or manufacturing.
-
Heating/Cooling: Jacketed trough and cored blades allow precise temperature control to melt fats, dissolve ingredients, or cool mixtures.
-
Discharge Options: Hydraulic tilting of the trough, bottom valves, or screw extruders for efficient emptying.
-
Construction: Typically stainless steel (304 or 316 grade) for hygiene and corrosion resistance; explosion-proof options available for volatile materials.
-
Additional Enhancements: Variable speed drives, computerized controls, and safety features like interlocks and guards.
Applications in Soap Production
This mixer excels at processing soap bases by combining oils, lyes, fillers, fragrances, and colorants into a uniform paste. It’s ideal for:
-
Soap Bases and Detergents: Kneading viscous soap pastes, liquid soaps, or syndet bars.
-
Specialty Products: Bubble gum-like chewing soaps, silicone-based formulas, or eco-friendly variants with clays/silica.
-
Related Industries: Beyond soap, it’s used for chewing gum, adhesives, battery pastes, pigments, and rubber compounds.
The vacuum feature minimizes foam and entrapment of air, resulting in denser, higher-quality soap with better lathering properties.
How It Works
-
Loading: Ingredients are added to the trough via the top opening.
-
Mixing Phase: Blades rotate, kneading the material for 10-60 minutes depending on batch size and viscosity.
-
Vacuum Activation: Air is evacuated to de-aerate the mixture.
-
Temperature Control: Jackets maintain 40-80°C for soap saponification or cooling post-reaction.
-
Discharge: Tilt the trough (up to 120°) or extrude via screw for seamless transfer to molding or cutting lines.
Benefits
-
Homogeneity: Achieves 95-99% uniformity, minimizing batch variations.
-
Hygiene and Safety: GMP-compliant designs prevent contamination; vacuum reduces dust/explosive risks.
-
Cost-Effective: Low energy use and easy cleaning (E-Z seals) lower operational costs.
Salient Features of Sigma Mixer Machine
-
Available in Stainless Steel 316, Stainless Steel 304 and Mild Steel materials.
-
Stainless Steel polish to matt & mirror finish as per customer’s requirements.
-
Mild Steel finish with one coat of red oxide and two coats of epoxy paint.
-
Discharge option of hand wheel operated (manual) or hydraulic operated (automatic) offered.
-
Jacket for heating or cooling application can be offered.
-
Mineral wool insulation with cladding on jacket.
-
Tangential designed ‘Z’ blades offered for uniform mixing.
-
PTFE made shaft sealing provided for food grade compatibility.
-
Minimum gap between trough inner shell & blades removes possibility of sticking product.
-
On demand Spray system, vacuum system
Optional Features/Accessories of Sigma Mixer
-
Liquid Spray System
-
Vacuum System
-
Blades Cooling Arrangement
-
Screw System
-
Automatic Valve Discharge System
Process Operation of Double Arm Sigma Mixer
In Sigma mixer tangential action of mixing and kneading obtained by ‘Z’ type (SIGMA) shaped kneading blades, which rotates very accurately at different speed towards each other causing product to be transferred from one end to another end. Discharge of the finished product is achieved by tilting the container or through the valves at the bottom or by means of an extrusion screw beside the container.
The mixing action is a combination of bulk movement, stretching, folding, dividing, and recombining of the material. The shearing & tearing action of the material against blades and the side walls causes size reduction of the solids. After the time period required for sterilizing the batch has elapsed, the heating circuit shuts of the pneumatics damper (exhaust) opens and cooling operation commences.
In the tangential design, the blades rotate in the trough meeting tangentially. The front blade generally rotates faster than the rear blade usually in the ratio of 3:2. Tangential blades are generally used for material of higher viscosities such as adhesives, rubber compounds, flush colors, dyes, and pigments.
In the overlapping design, the blades overlap above the saddle of the container. Due to the overlapping action, it is necessary that the relative position of the two blades is unchanged, and as a result, both the blades rotate at the same speed. Materials that flow freely or creep down into the blades are mixed using the overlapping blade action. This design offers a faster interchange of material from one blade compartment of the mixer to the other. Overlapping blade action is used for materials of lighter viscosities such as carbon pastes, clay coating, creams, and ointments. The overlapping blade produces a lower kneading and shearing compared to the tangential blade action.
Technical Specification of Sigma Mixer Kneader
| 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.
Send Inquiry