挤压膨化参数对豆粕保水性的影响

Influence of extrusion parameters on water holding capability of soybean meal

文章利用双螺杆挤压膨化机对大豆进行挤压加工,采用响应面设计方法建立模孔直径、物料含水率、螺杆转速以及套筒温度与豆粕保水性之间的数学模型。结果表明,各参数对豆粕保水性的影响由大到小依次为物料含水率(x2),套筒温度(x4),螺杆转速(x3),模孔直径(x1);经过遗传算法优化,得到高保水性豆粕的最佳参数为模孔直径14.8 mm,物料含水率18%,螺杆转速106 r.min-1,套筒温度91.5℃。得到豆粕保水性的最大值为318.99。

Extruded soybean meal with a twin screw extruder, the effects of the processing parameters including diameter of die nozzle, moisture content of material, rotational speed of screw and temperature of barrel on Water Holding Capability （WHC） of soybean meal were studied by response surface design test. After analyzing experiment datas, some formulas were studied and regulations were attempted to explain. The results showed that the significance of parameters on WHC of soybean meal was decreased according to the ranking of moisture content of material〉temperature of barrel〉rotational speed of screw〉diameter of die nozzle. Optimized the formulas by the genetic algorithm, the optimal parameters of high WHC of soybean meal were that the diameter of die nozzle was 14.8 mm, the moisture content of material 18%, the rotational speed of screw 106 r·min^-1, the temperature of barrel 91.5 ℃, and the maximum was 318.99.