Influence of particle size on the twin-screw extrusion of corn meal
1997
Garber, B.W. | Hsieh, F. | Huff, H.E.
Effects of particle size (50-1,622 micrometer), screw speed (200-400 rpm), and feed moisture content (19-22%) on twin-screw extrusion of corn meal were investigated using a full-factorial design. Torque, specific mechanical energy, and product temperature generally showed no change within the commonly used particle-size range (100-1,000 micrometer), but each value dropped significantly as the particle size increased > 1,000 micrometer. Die pressure was influenced by the three-way interaction of particle size, screw speed, and feed moisture content. The highest moisture level (22%), largest particle size (1,622 micrometer), and two largest particle size (200 and 300 rpm) were the only conditions where the starch was < 97.5% of transformation (gelatinization). Consequently, these two conditions also showed the least expansion and hardest product.
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