| Resumo: |
corotating twin screw extruder was used together with response surface rnethodology 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, banel temperature 140'C, fecd rate 16 kg/hr. The independent variables were selected at 4 levels (13.62,15.16, 16.66 and lg.llo/o wb) for feed moisture contents and at 5levels (0.18,0.38,0.84, 1.01, 1.35 mm.) for parriclc sizc. 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 partide size of feed. The seconcl ordcr polynomial equation obtained for cach response was observcd a satisfactory correlation.
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