Figure 6. Effect of the feed rate on the pressure distribution. The screw rotation speed was 88 rpm to determine the effect of the feed rate. The feed rate was 1.0 kg/h to determine the effect of the screw rotational speed. (a) Feed rate, (b) Screw rotational speed.
The effects of the feed rate and the screw rotational speed on the resin pressure in the kneading disc section are shown in Figure 6. The resin pressures obtained in the simulation and the experiment agree well within the relative discrepancy of 8.4 % (maximum) at 1.0 kg/h and 88 rpm.
Figure 7 shows the temperature distribution of the resin obtained at 1.0 kg/h and 88 rpm. There is a temperature distribution between the barrel and the screw. The temperature shown in the figure is the average temperature along the thickness direction. The temperature distribution along the axis direction shown by the black horizontal line in Figure 7 (a) is shown in Figure 7 (b). The resin temperature precisely and cyclically rises and falls because shear-induced viscous heating occurs at the tip of the screw and the pushing-side where the resin exists while the temperature of the trailing side is equal to that of the barrel, that is, 195 °C. The experimental data of the resin temperature is shown as “□.” The discrepancy between the simulation and the experimental temperatures is 1.5 °C.
(a)