Dual Mixing Blades: The sigma mixer features two horizontally oriented, sigma-shaped blades that rotate in opposite directions. These blades resemble the Greek letter "sigma," which gives the mixer its name.
Trough or Bowl: The mixing chamber of the sigma mixer is typically a trough or bowl-shaped vessel where the materials are loaded for mixing. The dual blades rotate within this chamber, ensuring thorough mixing and kneading.
Mixing Action: The sigma blades' design creates a shearing and kneading action as they move through the materials. This action effectively blends, disperses, and kneads high-viscosity materials, producing a homogeneous mixture.
Cooling or Heating Jackets: Some sigma mixers are equipped with cooling or heating jackets around the mixing chamber. These jackets allow for precise temperature control during mixing processes that involve temperature-sensitive materials.
Control System: Modern sigma mixers often include control systems that allow operators to adjust the mixing speed, direction of rotation, and other parameters for optimal mixing performance.
Applications:
Dough Mixing: Sigma mixers are commonly used in the food industry for kneading dough for bread, pasta, and various baked goods.
Rubber and Plastics: They are used to mix rubber compounds, polymers, and other high-viscosity materials in the rubber and plastics industries.
Pharmaceuticals: Sigma mixers can be employed for blending and mixing pharmaceutical powders, pastes, and formulations.
Chemicals: They are suitable for mixing adhesives, resins, sealants, and other chemical compounds.
Cosmetics: Sigma mixers are used in the cosmetics industry for blending creams, lotions, and other cosmetic products.
Benefits:
Effective Mixing: The dual-blade design and kneading action ensure thorough and consistent mixing even for high-viscosity materials.
Heat Transfer: Cooling or heating jackets allow for precise temperature control during mixing processes.
Versatility: Sigma mixers can handle a wide range of materials, from sticky pastes to dry powders.