Runner Balance derivation

Runner balancing is performed as a conditional minimization of a criterion function, which is calculated by using the results of a simplified analysis.

A runner system with dimensions that satisfy the criterion function is considered to be a balanced system.

The criterion function

The criteria function is based on Fill results and uses the following factors:

• Time imbalance. The difference in the filling time between the most difficult cavity to fill and the easiest cavity to fill is considered.
• Pressure imbalance. The difference between the maximum injection pressure for the iteration and the user defined target pressure is considered.
• Section imbalance. This is a measure of the change of the runner size throughout the feed system.

The optimization stops when the value of the criterion function for an iteration is less than a set value, or when the limit for the number of iterations is reached.