Sigma mixers are almost unlimited in application. They are equipped to process batches of material in wide viscosity range. The Sigma mixing and kneading machine consists essentially of a rectangular trough curved at the bottom to form two half-cylinders, with two blades horizontally disposed, and driven by suitable gearing on one or both ends of the trough. The blades sweep the entire area of the half cylinder on each revolution, revolving toward each other at unequal speed and imparting both transverse and lateral motion to the batch
Clearance between blades and trough is extremely close so that no particle of the batch can escape the mixing action of the blades, with every particle constantly in motion while the blades are moving. An intensive kneading action is performed simultaneously with the mixing as the material is pulled and squeezed against blades, saddle, and sidewalls. Sigma mixers can efficiently handle mixes ranging in consistency from dry powders to very stiff plastic masses.
Vacuum Mixers serve a very definite purpose in many industries mixing operations. It is often advantageous, and many times imperative, that mixing can be carried out under vacuum conditions. A batch can be economically dried by vacuum which remove solvents or moisture while material is being mixed. Oxidation of sensitive materials can be prevented by mixing; occluded gasses can also be efficiently removed and air will not be worked into mixes.
MIXER FEATURES
Working capacity of up to 2500 ltr and custom models available Choice of stationary or tilting units for loading and unloading to suit your production needs; bottom valve discharge units also available discharge screw extruder models available. Jacketed trough design for heating or cooling. Independent blade arm drive with differential rotating speeds of sigma shaped blades fitted horizontally in each trough of the bowl the complete mixer is mounted on fabricated stand of suitable strength to withstand the vibration and give noise free performance
The sigma blade mixer is commonly used for mixing and kneading high viscous materials usually in combination with a solid to another liquid material in variable proportions. It belongs to the class of double arm kneader mixers. The commonly used blade types are the sigma blade, masticator blade, shredder blade etc.The rotation of the blades could either be tangential to each other or the blades could overlap within the trough. The blades rotate toward each other at the same or differential speeds. The blades pass the container walls and each other at close clearances, normally within 3 – 5 mm resulting in uniform and homogenous mixing. The close clearances produce very high shearing action thereby promoting homogeneous mixing which could be achieved within several minutes to hours depending on the type of materials used. The design, construction and associated operational features etc could vary to one to another machine/supplier, however all the interested Vendors should keep in mind the sole purpose of mixing/kneading of the said equipment and fabricate the equipment accordingly following the underlining technical specifications.
Kneader/Mixer machines are titled for discharge, to achieve 100 percent discharge and thorough cleaning between batches. Generally for Kneader / Mixer machines upto 200 Liters capacity, the tilting mechanism is manual and over 200 Ltrs. capacity by Hydraulic Cylinders and Power Pack Unit. Kneader/Mixer machines are provided with Water-cooled jacketed through Body manufactured from M.S/S.S304, For Sigma blades shafts are provided with anti-friction bearing, with properly designed seals and packing glands. Sigma Blades are driven through A.C. Electric Motor, Flexible Coupling / Fluid Coupling / Geared Couplings and open spur gearing mechanism.
