F. Thibault et al., A NUMERICAL-MODEL FOR SINGLE-SCREW EXTRUSION WITH POLY(VINYL CHLORIDE) (PVC) RESINS, Polymer engineering and science, 34(18), 1994, pp. 1377-1386
A computer model has been developed to simulate the behavior of molten
polymer in the melt conveying zone of extruders. This model, based on
a hybrid finite difference/finite element resolution of the equations
of change governing momentum and heat transfer, allows the prediction
of the pressure profile while accounting for wall end effects as well
as the solid bed velocity. Simulation results are compared with analy
tical and finite difference method results found in the literature. A
fairly good agreement is obtained in the case of low density polyethyl
ene. Numerical tests are also carried out with rigid poly(vinyl chlori
de) compound used for window profile extrusion. The good agreement fou
nd between the predictions and experimental measurements obtained on a
n industrial extruder confirms the performance of the proposed model.