Figure 11 Degree of fill
distribution along the screw axis for 1 kg/h and 88 rpm.
The degree of fill was calculated by summing the filled element of the
FEM and dividing the total capacity of the screws, as shown in Eq. (29).
The degree of fill distribution along the screw axis is shown in Figure
11. From the feed port, the degree of fill slightly increases to the
kneading disc section where the degree of fill is unity. Then, the
degree of fill drops and increases again in the kneading disc section.
Over the kneading disc section, the degree of fill slightly increases to
the exit of the extruder. The degree of fill measured by the laser light
section method is shown as “○.” The simulation (0.111) and experiment
(0.092) agree well with each other. Their discrepancy is 0.019.