Sigma Blade Mixer Advantages
Sigma blade mixer is a kind of mixer which is specialized in using mixing high viscous material .
Sigma blade mixer is used for chewing gum, bubble gum, toothpaste, plastic, rubber, silicone rubber, dyes, pigments, inks, food base, pharmaceuticals, architectural coatings, carbon, fiber, high viscosity sealant, neutral glass glue, aluminum silver Pulp, silica gel, pulp, cellulose, battery paste, dyes, silicone resins, cosmetics and other industries.
The sigma mixer machine is a special mixing and mixing device. The most common one is to use two squeegee blades, which are arranged in a side-by-side differential speed type, that is, the speed of one stirring paddle is fast, and the speed of one stirring paddle is slow, so as to produce high Shear force, different paddle speeds enable the material to be quickly sheared so that the material can be totally mixed
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Working of Sigma Blade Mixer
Powders are loaded through the top of the trough to typically 40 to 65 % of the mixer’s total volumetric capacity. The entire mixing process is carried out in a closed trough because of the dust. The blades move at a different speed using the drive system that includes the motor, gear reducer, couplings, gears, bearings, and seals. The material moves up and down and shears between the blades and the wall of the trough. The Sigma mixer equipment is also attached to the perforated blades to break lumps and aggregates. The discharge of the material is either by tilting the mixing vessel, through the bottom discharge valve, or through a discharge screw. The homogeneous mixture is obtained within 10 to 30 min with a mixing homogeneity of up to 99%.
(i) The sigma blade mixer leaves fewer dead spots during mixing operations.
(ii) It is ideal for mixing and kneading highly viscous mass and sticky products.
(iii) These types of mixers and their variants can handle the highly viscous materials up to as 10 million centipoises.
(iv) The provision of perforated blades makes it suitable for breaking lumps and aggregates.
(v) The losses such as loss of volatile solvent during mixing can be prevented by closing the trough chamber and maintaining a low temperature.
(i) The power consumption in sigma blade mixers is very high compared to other types of mixers.
(ii) Requires more space for installation.
(iii) It requires proper blade speed adjustments.
(iv) There may be dead spots in the mixing tank.
Applications of Sigma Blade Mixer
(i) The sigma blade mixer is a commonly used mixer for high viscosity materials in preparing emulsions, syrups, and ointments.
(ii) Sigma blade mixers are used for the wet granulation process in the manufacture of tablets, capsules, and pill masses.
(iii) It is used for solid-liquid mixing as well as for solid-solid mixing.
(iv) It is the best mixer employed in the mixing components of pasty, sticky, and gritty slurries with high viscosities.
(v) Other applications of sigma blade mixer include mixing of adhesives, chemicals, chewing gum, food and confectionery products, hot-melts, inks and pigment products, soaps and detergents, sugar pastes, etc.