Z Arm Sigma Mixer

The Z Arm Sigma Mixer / Z Arm Sigma Mixer screw is used for the mixing-kneading of materials with very high viscosities. The Sigma Mixtruder is able to provide combined functions of compressing, stretching, folding, kneading & mixing, which makes it widely used in the chemical, food, sealing compound and paint industries, among others.

The machine is an efficient sigma type mixer with a screw in the bottom for unloading or extruding the mixed material. During the mixing process, the extrusion screw is driven in a reverse motion by a separate motor. This action of the screw pushes the material into the mixing zone and within reach of the blades, thus assuring a thorough blending of all the ingredients, and, at the same time, reducing the mixing time as compared with a standard sigma type mixer.

For discharging the material, the direction of the screws rotation is forwarded and the mixed material is then unloaded through the extension barrel.

Extremely tough materials such as filled thermosetting resins and bulk moulding compounds, are handled easily with the Sigma Mixtruder, along with scores of other materials.

The main mixing elements and extruder have different drives and as such both can operate independently.

The present capacities range from 25 litres to 2000 litres and can be supplied in various materials of construction viz. carbon steel, stainless steel of all grades, alloy steels, Hastelloy, abrasion resistant steel etc.

Z Arm Sigma Mixer are used in a number of food and commercial adhesive applications. Ingredients are blended until the consistency is correct. The ingredient is then tipped out of the mixer and forwarded to the next step in the process.   
These types of Z Arm Sigma Mixer machines are available in M.S. And S.S. construction. The kneader can be tilted by means of a mechanical system or manually and for bigger models beyond 250 Kgs we provided hydraulic tilting.

Hydraulic tilting system is provided with complete power pack, electric motor, pressure valves, pipes, fittings, cylinders and hoses which makes the tilting mechanism quick, easy and simple to operate.

Design of Sigma Mixer

Sigma Mixers design offered as per different application requirements. We offer wide range of design features meeting various user requirements. Some of the features are listed below:

• Blade Material: Material option of AISI 1030, AISI CF8 & AISI CF8M
• U Trough: Construction gauge offered from 3mm thick up to 30mm thick in mild steel and stainless steel 304 & 316 options.
• Motor horsepower: Motor horsepower ranging from 1.5 H.P. up to 250 H.P power.
• Power Voltage: Can be design as per various geographical power voltage requirements.
• Rotation speed: Fix and variable speed RPM offered with option of variable frequency drive.
• Feeding: Manual type feeding as well as vacuum/screw type automatic feeding can be offered.
• Discharge: Manual, chain type and hydraulic type automatic tilting as well as screw type side discharge system.
• Heating: Heating jacket offered for steam heating, hot water circulation and electrical heaters with suitable grade insulation.
• Cooling: Jacket offered for cool water circulation.
• Sealing: Silicon & PTFE sealing for food grade and asbestos sealing for industrial grade equipment offered.
• Finish: 180 grits to 240 grit finish on stainless steel parts and epoxy paint on mild steel parts.
• Discharge Clearance: Discharge clearance can be offered as per user requirements.

Application of Sigma Mixer

Sigma mixer is having wide range of industry wise applications. It is uses for production of highly viscous materials like Chemical, Dyes & Pigments, Paints, Polymers Plastic, Polyester Putties, Plastics, Pharmaceuticals, Food products etc. We are giving here below industry wise sigma mixer uses:

Food & Confectionery: Processing of finely milled wheat flour, bechamel sauce, chocolate, bubble gum, biscuit doughs, sugar paste, Bakery Dough, Chewing gum, Compounded Hing, Asafetida, Sugar pastes, Biscuit dough.

Paint & Solvents: Kneading of polyester putty, glass putty, adhesives, sealants, Fiberglass resin doughs, Polyester Compounds, Flush Colors, Brake lining compounds, Resins, Adhesives

Rubber Products: Mixing of rubber solution & silicon rubber, Stiff pastes, Silicon Rubbers, Viscous rubber solutions, Sealing compounds, Butyl rubber

FMCG: Blending of Liquid Soap, Liquid Detergent, Soap Noodles, Soap & Detergent, Ceramics,

Other Applications: Printing ink, Dispersion of iron compounds, ceramic powders, Crayon and pencil lead, Gaskets and gland packings, Grinding wheel preparations, Hot-Melts, Inks and pigment products, Marzipan,, Mastics, Metal powders, Moulding preparations, Pencil erasers, Pharmaceuticals, Plastics, Putties, Refractories, Magnetic Tape Coatings, Ceramics, Carbon Black, Carbon pastes, PVC coatings, Rubber Compounds, Fiber Glass, Grease, Lead Storage Battery, Zirconium Crucibles dough sigma mixer, Solid propellants

Exclusive Features of Sigma Mixer

• 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

Working Principle of 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

* 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.