Figure 5. Resin pressure distribution determined from numerical simulation and location of the pressure sensors (1.0 kg/h, 88 rpm). (a) Contour plot, (b) Plot along the machine direction.
The pressure distribution for a feed rate of 1.0 kg/h and a screw rotational speed of 88 rpm is shown in Figure 5. The resin pressure distribution of the contour plot indicates that the pressure in the kneading section and the pushing side of the full-flight screw are relatively higher than those in the other area. The resin pressure distribution along the horizontal line shown in Figure 5 (a) is shown in Figure 5 (b). The resin pressure switches between 0 and 1.2 MPa along the full-flight screw section. Since there is resin in the pushing side, the resin pressure becomes positive while the resin pressure becomes zero on the trailing side, given that there is no resin. The experimental data for the kneading disc section is shown as □. The discrepancy between the simulation and experimental results is 0.08 MPa, corresponding to a relative discrepancy of 8.4%, based on the experimental results.
(a) (b)