The gas injection stage of the Gas-assisted Fill+Pack analysis is an integral component of the filling phase, and allows you to specify gas entrance(s) directly into the cavity, or via the polymer injection location(s).
The onset of gas injection is independent of the time at which polymer injection stops, providing the ability to incorporate a dwell period between the end of polymer injection and the start of gas injection. The gas entrance can be set at the same time as the injection controller, as indicated below.
- Click
() and select Gas-assisted Injection Molding. - Click
(). - Click New. The Gas entrance dialog appears, allowing you to create an injection controller, or to select one from the database.
- To edit/create a controller, click Edit to display the Gas-assisted injection controller dialog.
- Enter a Gas delay time in seconds, measured from the velocity/pressure switch-over time.
- Select the gas injection control method:
- Automatic
- The solver will automatically determine a suitable gas injection profile for your part.
- Specified
- Select either gas pressure controller or gas volume controller, click Edit controller settings, enter the required controller parameters, then click OK.
- Enter a name for the Gas-assisted injection controller, then click OK.
- To select a controller, click Select, select the required controller in the list, and click OK twice.
- Click the cross-hairs on the model where you want to set the gas entrance on the model. A large G symbol with an arrow pointing towards the model appears, indicating that the gas entrance has been set.
- Right-click and select Finish Gas Entrances.
- Click
then click 
() to save your study.
Note: You can update the gas injection controller later by right-clicking on the yellow G (Gas entrance) and selecting Properties...