Define Barrel Elements

The following barrel elements are implemented in SIGMA:

• Define Barrel Elements
• Feeding barrel
• Venting Barrel
• Standard Barrel and Spacer Plate
• Combined barrel

To define a new barrel element, the type of element to be defined must first be selected in the Machine Configuration window under Create new element…, for example a closed barrel.

Editing an already defined element can be performed by double-clicking the element to be edited in the list of machine elements or by using the icon Edit properties of the selected element. In addition, data can now also be modified directly in the Element Properties list by double-clicking the property to be changed and confirming the modified value with Return.

Path: Main menu > Configuration > Configuration editor > New element… > Feeding barrel



In order to define a new feeding barrel, choose Feeding barrel after hitting the New element button in the Machine configuration.

In this mask some characteristic values have to be determined:

• In order to be able to identify the barrel element clearly, you have to put in a Name for it at first.
• The Diameter of the barrel is predefined by the machine diameter which was determined beforehand. However, you should put in more exactly values for the diameter in this place, then will gather the leakage between barrel wall and screw flight more exactly.
• The Length of the barrel element can be entered in millimeters or as multiple of the Standard value.
• The Centerline distance of the two screws is given as further information in this dialog mask. It is not possible to change it in this place.
• The Length of Opening and the Distance of Opening to Front of Barrel has to be entered, too. The front of barrel is the downstream situated side.
• At the item Type the radial position of the opening can be determined. However, this is only of interest for the flooding check after the calculation and for graphical purposes. The opening does not influence the calculation, though.

Path: Main menu > Configuration > Configuration editor > New element… > Venting barrel

The dialog window Venting barrel is quite similar to the one for the feeding barrel. That is why it is not specified in detail at this point.

Main menu > Configuration > Configuration editor > New element… > Standard barrel

The dialog windows for Standard Barrel and Spacer Plate are completely equal. Standard barrels and spacer plates are closed barrel sections. The only difference is that standard barrels are heated and spacer plates are not.

Both of them are entirely defined by entering the Diameter and the Length of the barrel.

Path: main menu > configuration > configuration editor > create new element… >combined barrel

The combined barrel connects the characteristics of a degassing- and an addition barrel in only one element.

The dialogue window is only slightly different to the dialogue window of the Dialogfeld of the degassing- and an addition barrels. Because of this, further explanation is not needed.