The effects of extrusion process parameters such as diameter of die nozzle,moisture content,rotating speed of screw and barrel temperature on the residual oil of soybean meal,production efficiency and per kilowatt-hour yield were researched by the method of quadratic orthogonal rotation combination test.With the method of illegibility analysis and the frequency analysis,the optimum parameters of extrusion system were obtained as follows:diameter of die nozzle 20-22 mm,moisture content 16%-17%,rotating speed... |