The Effects of the Type of Cereal Powder and Extruder Operation Conditions on the Barrel Temp.-distribution

원료곡분의 성상과 압출 조건이 Extruder 내부 온도분포에 미치는 영향

  • Ryu, Gi-Hyung (Department of Food Technology, Korea University) ;
  • Lee, Cherl-Ho (Department of Food Technology, Korea University)
  • 류기형 (고려대학교 식품공학과) ;
  • 이철호 (고려대학교 식품공학과)
  • Published : 1988.06.01

Abstract

The heat generation at the start-up period of an autogeneous single screw extruder was determined with various feed materials, die structure and operational conditions. The highest heat generation rate was observed with defatted soybean meal, while the lowest value was obtained with rice flour, and wheat and barley flour showed the intermediate rate. As the moisture content of the flour decreased and the screw speed increased, the electric power requirement and heat generation rate increased. The temperature at compression section increased with the decrease in the particle size. The same effect was also observed as breaker plate was installed. The optimum operation was established as the temperature profile was maintained in decreasing order of metering section, die and compression section.

Keywords

extruder;cereal powder;operation condition of extruder