After approximately 95-98% of part filling the switch between filling and packing phase is made.
This point is called VP-Switch (red arrow).
It is the change from the flowrate controlled filling to the pressure controlled packing phase.
The right time for the switch can be found with the help of the cavity pressure.

VP-Switch in Plastic Industry

Injection Molding Process: At the VP-Switch (red arrow) the process changes from filling to packing phase.

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This glossary of plastic industry is provided by PLEXPERT Canada Inc.