초록

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압출성형기의 모터에너지는 자가발열 열에너지와 기계에너지로 전환되며 히터에너지는 열에너지로 공급되는데 각 에너지가 녹말의 호화에 미치는 영향을 분석하였다. 저온$({\leq}80^{\circ}C)$ 압출성형조건에서 자가발열 에너지는 낮은 수분함량의 분체 마찰에 의한 것과 높은 수분함량의 점성에 의한 것으로 구분할 수 있었으며 분체 마찰에 의한 열에너지가 호화에 더 효과적임을 알 수 있었다. 또한 모터에너지에서 자가발열되고 남은 순수한 기계에너지의 효과를 상대기계에너지로 평가한 결과, 높은 수분함량$({\geq}33%)$ 조건의 호화는 상대기계에너지의 변화에 크게 의존하며 낮은 수분함량$({\leq}30%)$의 경우는 거의 영향을 받지 않는 것으로 나타났다.

Abstract ▼ AI-Helper

The effect of the energy supplied in extrusion on the starch gelatinization was analyzed. The energy needed for extrusion is generated by motor and heater. The motor energy is transformed into a thermal energy by heat dissipation and a mechanical energy, and the heater energy is of a thermal energy....

The effect of the energy supplied in extrusion on the starch gelatinization was analyzed. The energy needed for extrusion is generated by motor and heater. The motor energy is transformed into a thermal energy by heat dissipation and a mechanical energy, and the heater energy is of a thermal energy. At the low barrel temperature $({\leq}80^{\circ}C)$, it was found out there are two kinds of thermal energy by heat dissipation: one by a powder friction of corn grit with low moisture contents and the other by a viscous dissipation of corn grit with high moisture contents. The dissipated thermal energy by the powder friction was more effective on the starch gelatinization than that by the viscous dissipation. The effect of the mechanical energy was also analyzed in terms of a relative mechanical energy. The gelatinization of corn grit with high moisture contents $({\geq}33%)$ largely depended on the change in the relative mechanical energy, whereas that with low moisture contents $({\leq}30%)$ hardly depended on it.

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