Effect of feed moisture and particle size on some characteristics of corn extrudates produced by corotating twin screw extruder
1996
Pracha Boonyasirikool | Maradee Phongpipatpong | Chulaluck Charunuch (Kasetsart Univ., Bangkok (Thailand). Inst. of Food Research and Product Development)
Corotating twin screw extruder was used together with response surface methodology to study the effect of feed moisture content and particle size on the characteristics of corn extrudates. The operating conditions were fixed at screw speed 250 rpm, barrel temperature 140 deg C, feed rate 16 kg/hr. The independent variables were selected at 4 levels (13.62, 15.16, 16.66 and 18.11 percent wb) for feed moisture contents and at 5 levels (0.18, 0.38, 0.84, 1.01, 1.35 mm) for particle size. Response variables were expansion ratio, bulk density, breaking force, water absorption index and water solubility index. Regression analysis showed that change in all responses for corn extrudates were promoted by feed moisture content rather than particle size of feed. The second order polynomial equation obtained for each response was observed a satisfactory correlation.
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