挤压膨化机模孔参数的试验研究

Experiment Research on Die Orifice Parameters of the Screw Extruder

分析了模孔尺寸对机器产量和工作压力的影响。通过实验得出模孔尺寸对产量、耗电量的影响及长径比(L/D)对压力、产品α度及膨化率的影响。当压力为5.5 MPa、L/D=4时,产品膨化率最大;压力为5.6 MPa、L/D=4.1时,产品α度最大。根据试验所得数据,对通过模孔物料的流动特性指数和粘度指数进行了估算。

In the paper, the effect of the die orifice dimension on output and working pressure is analyzed. Through the experiments, the effect of the die orifice dimension on the output, power consumption and the effect of L/D ration on pressure and expansion rate as well as a degree were led to a conclusion. When the pressure was 5. 5 MPa,L/D=4,the expansion rate reached the maximum) while the pressure was 5. 6 MPa,L/D=4. 1 ,the product a degree arrived at the top value. Based on the experimental data, flow characteristic index and viscosity index of the material passing the die orifice were evaluated. On the basis of the evaluated data, the productivity and pressure drop were calculated.