Sigma Mixer Manufacturer in Mumbai
ranging from 3 Ltrs. to 2000 Ltrs.
Application for Sigma mixer:
Abster Equipment offering a sigma mixer kneader are ideal heavy duty mixer which can be used in Explosive / Chemical as well as Food processing industry. Abster Equipment is well know manufacturer, supplier and exporter of sigma mixer kneader user’s requirements since 1995 from Mumbai/Ahmedabad to India and all over the world.
Working Principle Sigma Mixers
The Trough or say bowl is made of heavy steel plate making it a rugged heat proof unit. This is especially useful for bulky material and additional thinning prior to discharge. Tangential blades are supplied with differential speeds. Heavy duty machine cut spur gears are provided. Spherical type bearings are provided at both the ends to suit both radial and thrust load. Gland type shaft seals are fitted at both the ends for easy maintenance.
Bowl is provided with jacket for temperature control and adoptable for cold water or brine or hot water, steam etc. Sigma Mixers can be designed for vacuum operations. Sanitary construction is provided for food and pharmaceutical procedures.
Manually operated discharge system is provided for lab models and motorized discharge system is provided for plant models.
All double arm kneader mixers are equipped with two mixing blades placed in a W-shaped horizontal trough. Various blade profiles have evolved, each of which is best suited for a particular type of application. The commonly used blade types are the sigma blade, masticator blade, shredder blade, naben (aka fishtail) blade, and spiral blade. The rotation of the blades is either tangential to each other or the blades may 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 (2-3 mm) resulting in homogeneous mixing. The close clearances produce very high shearing action thereby reducing any large particles. These mixers produce a consistent particle size distribution without the need for additional high speed choppers. Homogeneous mixing is achieved within 10 to 30 minutes. Mixing homogeneity up to 99% and better can be achieved using the double arm kneader mixers. These mixers and their variants (double arm kneader mixer extruders) are capable of handling material with viscosity as high as 10 million centipoises. The power consumption in double arm kneader mixer is very high compared to other types of mixers and can range from 45 to 75 kW/m3 of mix material. The sigma blade mixer is the most commonly used type of double arm kneader mixer, and is best suited for all round use.
Operation of Sigma Blade Mixer
In operation, material is loaded through the top of the container to typically 40 to 65 percent of the mixer’s total volumetric capacity. The rotation of the blades is through heavy duty drive systems typically consisting of a motor, gearbox, couplings, and gears. The tip speed of the sigma mixer is generally limited to 60 meters per minute. Mixing may be carried out at ambient temperature or under controlled temperature conditions. The mixer troughs can be provided with jackets for circulation of hot or cold media to maintain the required temperature conditions within the mixer. The discharge of the material from the mixer container is either by tilting of the mixer container, bottom discharge valve (see figure 5), or through an extruder / screw located in the lower portion between the two trough compartments . The Sigma mixer may be equipped with any one of these discharge arrangements.
The tilting discharge arrangement is most common. The tilting arrangement of the container may be designed for manual operation or may be mechanized using motorized or hydraulic arrangement.