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Sigma Mixer Blade Types | JCT Machinery

February 17, 2025

sigma mixer blade type

Sigma Mixer Blade Types

1. Fishtail Blade: Suitable for kneading cellulose materials.
2. Z-shaped Blade: It is also known as simple stirring blade, suitable for dispersing pigments in resins under high viscosity conditions.
3. Cutting Blade: Suitable for kneading ultra-high viscosity materials under high power and heavy load conditions.
4. ∑-shaped Blade: The most common type, suitable for kneading materials that must have large movement in the kneading and tank, especially suitable for extrusion dehydration operations.

Sigma Mixer Blades Working Principle
1. Inner and Outer Movement
When the two ∑ blades rotate in opposite directions, the material is subjected to two rotating forces, which creates strong inner and outer movement inside sigma mixer. This movement causes the material to be "rolled up" and continuously brought to different positions of the container for thorough mixing.
2. Circulation
The material is sheared and pushed by ∑ blades in sigma mixer mixing cylinder, which not only ensures the uniform distribution of the material from top to bottom, but also prevents the material from accumulating on the cylinder wall.
3. Heating / Cooling Effect
Sigma mixer usually has external jacket or coils that can heat or cooling the material. During the mixing process, the blades continuously turn the material over, effectively dispersing the heat or cold, and ensuring temperature balance throughout the mixing process.

sigma mixer

Sigma Mixer's Blade Design Features
  • 1. Double Helical Ribbon Structure

  • The two ∑ blades rotate in opposite directions, forming an "X"-shaped stirring action. This design allows the material to circulate between the two helical ribbons and between the helical ribbons and the cylinder wall, ensuring the full mixing of high-viscosity materials through strong shearing and flow of the materials.

  • 2. High Shear Force

  • The blades of sigma mixer mix the high viscosity materials evenly through high-speed rotation and strong shearing force. This is very important for mixing certain high-viscosity materials such as adhesives, inks, coatings and rubber. Shear force also helps to break up agglomerated materials and disperse pigments, fillers, etc., to improve the dispersion effect.

  • 3. Blade Spacing and Shape Design

  • The blade spacing and shape are usually designed to ensure that the material is fully turned and stirred. Different blade designs can be selected for different applications to achieve the best mixing effect.

  • 4. Asymmetric Design

  • Sigma mixer's blades are usually asymmetric in design, that is, one blade rotates slightly faster than the other. This design helps to enhance the fluidity of the material and ensure a more uniform mixing effect.


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