This page of the Process Settings Wizard is used to specify process settings for the second injection unit, which controls Material B for a Co-injection Molding or Thermoplastics Bi-injection Molding process analysis.
To access this dialog, ensure that you have selected either the Co-injection Molding or Thermoplastics Bi-injection Molding process and an analysis sequence that includes Fill or Fill+Pack, click 
(), and then click Next to navigate to the Process Settings Wizard - 2nd Injection Settings page.
General settings
- Delay timer
- A means to delay the injection of material B until a specified time following the start of the injection of material A.
- No delay
- This is the default setting. Material A and material B are injected at the same time.
- By time
- Enter the time in seconds, following the start of the injection of material A, when you would like to inject material B.
- By ram position
- Enter where in the cycle the ram should be, before injecting material B.
- By injection pressure
- Enter the value that the injection pressure should reach, before injecting material B.
- Melt temperature
- The temperature of the molten plastic, or melt, as it starts to flow into the cavity.
In cases where this is an input box, enter the required melt temperature.
Note:- If the model has a runner system, the melt temperature refers to the temperature of the melt as it enters the runner system. If the model does not have a runner system, the melt temperature is the temperature of the melt as it exits the gate(s).
- The melt temperature cannot be lower than the Transition temperature.
- Filling control
- Specifies the method by which the filling phase of the analysis is controlled. Select the method to control polymer injection during the filling phase.Note: If you select Ram Speed Profile, you must select the profile variables, and enter the profile.
- %Ram speed vs %stroke
- Controls the injection ram using the percent of stroke and percent of speed of the ram.
Click Edit profile and type your values in the table to change the profile.
- %Flow rate vs %shot volume
- Controls the speed of the ram (flow rate) as a function of the ram position (shot volume).
Click Plot profile and type your values in the table to change the profile.
Note: You can also set a reference point for the profile as a nominal flow rate or injection time.
- Velocity/pressure switch-over
- The criteria by which the molding machine will switch from velocity control to pressure control. Select the required switch-over method in the drop-down list, and then specify the switch-over point.Note: On a typical molding machine, the standard setting will be 99% of volume filled. If the switch-over is occurring early, look for a short shot or check material compressibility has been taken into account when setting the velocity/pressure switch-over point.
- [By % volume filled] at
- Specify the percentage of volume filled value at which the switch-over point from velocity control to pressure control should occur.
- [By injection pressure] at
- Specify the injection pressure value at which the switch-over point from velocity control to pressure control should occur.
- [By clamp force] at
- Specify the clamp force value at which the switch-over point from velocity control to pressure control should occur.
- Velocity/pressure switch-over by pressure control point
- Specify the switch-over point by selecting a pressure control point inside the cavity. Once the specified pressure is reached at the selected node, the program will change from velocity to pressure control, and the pressure profile will be applied.
Enter the node number and pressure to specify the pressure control point.
- [By injection time] at
- Specify the injection time value at which the switch-over point from velocity control to pressure control should occur.
Velocity/pressure switch-over will occur as soon as this amount of time in the filling phase has elapsed.
- [By ram position] at
- Specify the ram position value at which the switch-over point from velocity control to pressure control should occur.
- [By hydraulic pressure] at
- Specify the hydraulic pressure value at which the switch-over point from velocity control to pressure control should occur.
- By whichever comes first
- Specify the switch-over point from velocity control to pressure control, by setting more than one of the available switch-over criteria.
Click Edit switch-over settings to set the switch-over criteria. Velocity/pressure switch-over will occur as soon as one of the specified criteria is fulfilled.
- Pack/holding control
- Specifies the method by which the pressure phase of the molding process is controlled.
Select the required control method, click Edit profile, and then enter the pressure profile.
Important: For Injection-compression analysis, Pack/holding control controls the injection unit, not the compression unit.- %Filling pressure vs time
- Controls the packing phase of the molding cycle as a function of percentage filling pressure versus time.
- Packing pressure vs time
- Controls the packing phase of the molding cycle as a function of injection pressure versus time.
- Hydraulic pressure vs time
- Controls the packing phase of the molding cycle as a function of hydraulic pressure versus time.
- %Maximum machine pressure vs time
- Controls the packing phase of the molding cycle as a function of percentage maximum pressure versus time.
- Second injection unit options
- Click this button to display the advanced options dialog for second injection unit, which controls Material B.