Question:
The most important operating parameters in an extruder are temperature, pressure, the diameter of the die apertures and the
The most important operating parameters in an extruder are temperature, pressure, the diameter of the die apertures and the
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Extruder processing depends critically on barrel temperature, barrel pressure, die diameter, and shear rate.
Updated On: Sep 15, 2026
- Shear rate
- Crushing rate
- Mixing rate
- Drying rate
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The Correct Option is A
Solution and Explanation
Step 1: Understanding the Concept:
Extrusion cooking is a high-temperature short-time (HTST) continuous thermomechanical processing operation.
Step 2: Detailed Explanation:
The physicochemical transformation of starch and protein biopolymers in an extruder depends on barrel temperature, pressure, die aperture geometry, moisture, and screw shear rate (governed by screw speed and flight geometry).
Shear rate controls mechanical energy dissipation, starch gelatinization, molecular degradation, and melt expansion.
Step 3: Final Answer:
Therefore, the key operating parameter is shear rate.
Extrusion cooking is a high-temperature short-time (HTST) continuous thermomechanical processing operation.
Step 2: Detailed Explanation:
The physicochemical transformation of starch and protein biopolymers in an extruder depends on barrel temperature, pressure, die aperture geometry, moisture, and screw shear rate (governed by screw speed and flight geometry).
Shear rate controls mechanical energy dissipation, starch gelatinization, molecular degradation, and melt expansion.
Step 3: Final Answer:
Therefore, the key operating parameter is shear rate.
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