Vents

Add line vents to enable gases to travel along the part and escape from the parting line of the mold.

1. Click the Line Vent icon.
   
   
2. Click and drag to sketch a line vent on the mold. Click again to end the vent.

   
   
   Figure 1. Example of Line Vents on a PolyFoam Model

   In a PolyFoam model, you sketch vents on the exterior faces of the mold for ease of use. The software projects the vents to the part and runs the simulation on the model as if the vents were located on the part.

   In a physical model, line vents are placed along the part to move the air from the part to the partition line.

   
   
   Figure 2. Example of Line Vents on a Physical Model

3. Use the microdialog options to define the parameters of the line vent.

   Microdialog option		Description	Note
   Move Line Vent		Click the Move tool to change the location of the vent.	Alternatively, enter the X, Y, and Z coordinates for the vent.
   Thickness		The thickness accounts for the size of the gap that exists at the parting line of the mold.	Enter the gap thickness value.
   Porosity		The porosity value controls the vent opening that syphons gas away from the part.	Enter a value between 0 and 1, where 0 means the vent is fully closed, and 1 means the vent is fully opened.

Add point vents to enable gases to escape from around the part and through the exterior of the mold.

1. Click the Point Vent icon.
   
   
2. Click a surface on the part to place a point vent.
   
   
3. Use the microdialog options to define the parameters of the point vent.
   
   

   Microdialog option		Description	Note
   Move Line Vent		Click the Move tool to change the location of the vent.	Alternatively, enter the X, Y, and Z coordinates for the vent.
   Vent Shape		Circular: Circular vents release gasses through the exterior of the mold. Square: Square vents enable air to escape from around the part in the mold.	Select a shape for the vent. For circular, enter the radius of the vent. For square, enter the X, Y and Z dimensions of the vent.
   Porosity		The porosity value is the filtering capacity of the vent to siphon gases away from the part.	Enter a value between 0 and 1, where 0 means no gases can escape and 1 means gases can fully escape.
   Variable Porosity		Variable porosity defines a venting system with time-dependent changes to vent porosity. You can apply variable porosity to individual point vents to siphon gases away from the part.	Select the check box to enable variable porosity. To define the porosity properties, click the variable porosity button and enter the porosity over time in the dialog:
   Variable Pressure		Variable pressure defines a venting system with time-dependent changes to pressure, including vacuum conditions. You can apply variable pressure to circular point vents to siphon gases away from the part.	Select the check box if your model includes a pressure system. To define the pressure properties, click the variable pressure button and enter the pressure over time in the dialog: