Mechanism of Semisolid Mixing

• Semisolid mixing combines aspects of both solid and liquid mixing due to the intermediate nature of semisolids (e.g., creams, pastes, gels):

1. Convective Mixing:

   • Similar to solid mixing, involving bulk movement but adapted to the higher viscosity of semisolids.

2. Shear Mixing:

   • Applying shear forces using equipment like planetary mixers, sigma blade mixers, or kneaders.
   • This is critical to overcoming the high resistance to flow in semisolids.

3. Extensional Flow:

   • Stretching the material to enhance mixing, particularly important in high-viscosity materials.

4. Homogenization:

   • Often used to break down particle agglomerates and improve uniformity. This might involve high-pressure homogenizers or mills.

Semisolid Mixing Equipment

1. Planetary Mixers: Use rotating blades and a rotating container for thorough mixing.
2. Sigma Blade Mixers: Use two large blades that move in a sigma shape to knead and mix.
3. Extruders: Force materials through a narrow die to achieve mixing and shaping.

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