The Study of Physical and Chemical Properties of Feed Corn Extrudates

• Main Authors: Chen, Chun-ho, 陳淳和
• Other Authors: Jin-chyau Peng
• Format: Others
• Language: zh-TW
• Published: 1996
• Online Access: http://ndltd.ncl.edu.tw/handle/46452436363141013232

碩士 === 國立中興大學 === 農業機械工程學系 === 84 === Feed corn was used as the raw material to study the effects of process parameters on extrudates residence time distributions, physical and chemical properties by using a single-screw extruder. The process parameters were barrel temperature, screw speed and feed rate. The physical and chemical properties were moisture content, cross-sectional expansion ratio, longitudinal expansion ratio, bulk density, shear force, whiteness index, saturation index, water solubility index, water absorption index, degree of gelatinization, starch digestibility, and browning reaction. The experiment was a 3×3×3 factorial design. Results indicated that : 1. Barrel temperature, screw speed and feed rate were influential in mean residence time. Mean residence time was significantly affected by the feed rate. Decreasing of the feed rate raised the mean residence time. 2. The changing of barrel temperature had the greatest effect on extrudates physical and chemical properties. The feed rate was the second important factor affecting the extrudates physical and chemical properties. The screw speed only provided the negative correlation with the extrudates saturation index. 3. The optimum operating conditions for the feed corn by using the single-screw extruder were 80℃-80℃-80℃ barrel temperature, 73.3rpm screw speed, and 15.53kg／h feed rate.