Profiles are used to ensure that the simulation matches the actual molding process as accurately as possible.
Packing profiles are used in the packing phase to control the packing pressure applied to the mold. The packing profile helps to reduce mold defects such as flashing, short shots, jetting, burning, sink marks, warpage, flaking, and more.
The velocity should be reduced when the flow front reaches the end of filling to prevent overpacking of the cavity, which may cause stress problems, warpage, and flashing. This facilitates a smooth transition to the packing phase where a pressure profile is used to ensure uniform shrinkage, reduce warpage, and to pack the part well without overpacking.