About the Fill Simulation Options

The app calculates acceptable default values for all of the main parameters in a fill simulation.

• The fill rate profile defines the rate at which polymer material is injected and how this rate varies during the fill simulation.

  The default profile causes the cavity to fill at a constant rate such that the cavity fills in 1/10 of the automatic cooling time, $t_K$, as determined by

  $$t_K\approx \frac{s^2}{{\pi }^2{a}_{\mathrm{eff}}}\ln \left(\frac{8}{{\pi }^2}\cdot \frac{{\theta }_M-{\theta }_W}{{\theta }_E-{\theta }_W}\right),$$
  where $s$ is the average thickness; ${\pi }^2{a}_{\mathrm{eff}}$ is the heat conductivity (expressed as density times specific heat); and ${\theta }_M$, ${\theta }_W$, and ${\theta }_E$ are the melt temperature, mold temperature, and ejection temperature, respectively.

• The filling time is computed automatically from the fill rate profile.
• The machine pressure limit represents the maximum pressure that the app can apply at the injection locations. If the pressure required to satisfy the fill rate profile exceeds this limit, the fill rate is reduced automatically, and the resulting filling time increases. The default pressure limit is 100 MPa.