The Ceramics Sigma Mixer, also known as a Sigma Blade Mixer or Z-Blade Kneader, is a specialized industrial mixing machine designed for processing high-viscosity, dense, and sticky materials commonly used in the ceramics industry. It excels at kneading, mixing, homogenizing, crushing, dispersing, and repolymerizing raw materials like ceramic powders, clays, glazes, and slurries, ensuring a uniform consistency essential for producing high-quality ceramic products such as tiles, sanitaryware, tableware, and refractories.
Carbon Paste Sigma Mixer Video
Key Features
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Dual Sigma Blades: Equipped with two Z-shaped (sigma) blades that rotate in opposite directions within a U- or W-shaped trough. This design generates intense shearing, folding, and kneading forces, allowing thorough mixing of materials with varying moisture content, particle sizes, and viscosities—up to 10,000,000 centipoise.
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Variable Speed Control: Adjustable blade speeds for precise control over the mixing process, accommodating different batch requirements and achieving optimal texture.
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Jacketed Design for Temperature Regulation: Many models include a double-walled jacket for heating or cooling the mixture via steam, hot oil, or chilled water, ideal for temperature-sensitive ceramic formulations.
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Hydraulic Tilt and Discharge System: Facilitates easy tilting of the trough for efficient unloading, minimizing manual labor and contamination risks.
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Optional Vacuum Capability: Some variants incorporate a vacuum pump to remove air bubbles, enhancing material density and quality in precision ceramics applications.
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Construction Materials: Typically made from stainless steel for corrosion resistance and hygiene, with robust frames to handle heavy-duty operations.
Applications in Ceramics
This mixer is indispensable for preparing ceramic batches by blending raw materials like kaolin, feldspar, quartz, and binders. It supports both lab-scale (e.g., 5-50L) and production-scale operations, making it versatile for R&D and manufacturing. Beyond ceramics, it’s adaptable for similar viscous materials in pharmaceuticals, inks, adhesives, and food processing, but its robust design is tailored for the abrasive and high-load demands of ceramic production.
Advantages
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Efficiency: Achieves homogeneous mixing without dead zones, reducing processing time and energy use.
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Scalability: Available in custom sizes, from laboratory models for testing to large extruder-integrated units for continuous production.
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Safety and Maintenance: Features interlocking guards, overload protection, and easy-to-clean designs for compliance with industry standards.
Salient Features of Sigma Mixer Machine
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Available in Stainless Steel 316, Stainless Steel 304 and Mild Steel materials.
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Stainless Steel polish to matt & mirror finish as per customer’s requirements.
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Mild Steel finish with one coat of red oxide and two coats of epoxy paint.
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Discharge option of hand wheel operated (manual) or hydraulic operated (automatic) offered.
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Jacket for heating or cooling application can be offered.
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Mineral wool insulation with cladding on jacket.
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Tangential designed ‘Z’ blades offered for uniform mixing.
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PTFE made shaft sealing provided for food grade compatibility.
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Minimum gap between trough inner shell & blades removes possibility of sticking product.
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On demand Spray system, vacuum system
Optional Features/Accessories of Sigma Mixer
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Liquid Spray System
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Vacuum System
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Blades Cooling Arrangement
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Screw System
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Automatic Valve Discharge System
Process Operation of Ceramics 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.
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