Question

Which mixer is especially suitable for highly viscous food materials such as dough?

• A. Planetary mixer
• B. Propeller mixer
• C. Turbine mixer
• D. Ribbon blender

Hint:

High-viscosity paste and dough mixing require shear and positive displacement actions like planetary movement or Z-blade mechanisms.

Answer 1

The Correct Option is A

Step 1: Understanding the Question:
This question is about selecting the appropriate industrial mixer for processing highly viscous, non-Newtonian plastic systems like dough.

Step 2: Key Formula or Approach:
Dough mixing requires high shear, stretching, and folding action (kneading). Mixing elements must travel throughout the entire volume of the container to prevent stagnant zones.

Step 3: Detailed Explanation:

• Planetary Mixer: The mixing blade rotates on its own axis while also revolving around the center of the mixing bowl. This complex movement provides excellent kneading, high-torque shearing, and complete spatial coverage, making it highly effective for heavy bakery doughs.

• Propeller Mixer: Operates at high speeds to generate axial flow in low-viscosity liquids, but would stall or break in dough.

• Turbine Mixer: Generates radial flow and moderate shear for liquid blending, but is ineffective for sticky, plastic masses.

• Ribbon Blender: Uses helical ribbons to mix dry powders or low-viscosity pastes, but lacks the necessary power and direct kneading action for gluten development in heavy bread doughs.

Step 4: Final Answer:
Therefore, the planetary mixer is the correct choice.