Pack analysis predicts the thermoplastic polymer flow inside the mold in the packing phase. This analysis is run as the second part 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 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.
A Pack analysis accepts a minimum of 8 and a maximum of 20 laminates across the part thickness to calculate results. The default number of laminates across the thickness is 12. You can change this value by editing the solver parameters.
If symmetrical thermal boundary conditions exist (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 half of the specified number, reflected symmetrically across the part. Running a Cool analysis prior to running a Fill+Pack analysis provides asymmetrical cooling information, and the full specified number of laminates is used to calculate results.
Before running a Fill+Pack analysis, pay close attention to the edge length of the mesh around high curvature areas on your model, and make sure the mesh in these areas is not too coarse. It is recommended that you mesh with a smaller edge length so the mesh approximates the corners correctly.
The Pack analysis is used to predict the polymer flow inside the mold during the filling and packing phases.
Use this dialog to specify settings for a Pack analysis.
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.
Parallel solution (multi-threaded) technology is implemented as an option in the process settings for 3D Flow (Coupled 3D solver only) analysis to improve solution speed.
To perform a 3D analysis on an STL model, it is essential that the model is watertight before it is imported.