The Pack Analysis predicts the thermoplastic polymer flow inside the mold during the packing phase. This analysis is run as the second stage of a Fill+Pack analysis sequence, and can be used to determine whether a cavity will be completely filled.
A Pack analysis calculates a flow front that grows from the locations in the model that the flow front had filled when the velocity/pressure switch-over point was reached. The analysis continues until the flow front has expanded to fill the last location in the model.
The Pack Analysis accepts eight laminates across the part thickness to calculate the results. If symmetrical thermal boundary conditions exist, and Cool analysis results are not available, the analysis is based on a half-gap calculation and the actual number of laminates used in the calculation is 4. This is reflected symmetrically across the part for a total of eight laminates. Running a Cool Analysis prior to running a Fill+Pack Analysis provides asymmetrical cooling information, and the full eight laminates are used to calculate results.
The Standalone Pack analysis is used for molds that are not expected to have any difficulty in filling. This analysis is generally used for very thick parts, where the packing phase is a higher priority.