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How to determine the optimal filling control with runners?

How to determine the optimal filling control with runners?

Selecting the correct injection time can be critical for avoiding short shots and preventing quality issues like burn marks.
I typically use Molding Window to establish my part-only injection time. I would then run an actual Filling analysis to verify my injection time. 
Once I add a runner system, I can’t use the same injection time since I have added additional plastic volume to the system. Assuming my part-only Filling analysis looks acceptable, I would then go to the log file and look at the calculated flow rate. This flow rate will become my new filling control with my part + runner model.
How do you determine the optimal filling control with runners?

You can see one window that shows the initial number of threads used in the analysis and another window that shows the Fill+Pack Settings.

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