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The screw picks up and forces incoming liquid bearing material toward and through an adjustable choke opening at the discharge end of the press. This force creates a pressure on the material, which causes the liquid therein to be released and passed from the Expeller through slots in the barrel.Varying the size of the choke opening for a given feed rate or varying the feed rate within limits for a given choke setting, changes the amount of pressure on the confined material, and thus determines, to a great extent, the amount of liquid which will be removed, or conversely, the residual liquid content of the discharge solids.

At this point, with the system running properly, the Expeller and Expander/Dryer motor “Motor Load Relays” should be set for “Low” and “High” values (supplied by AIC only if our control system is included in the equipment scope). The alarm system will alert the operator of any changes in the crumb feed rates. If motor load to the Expeller decreases, the Expeller “Low Current” will alarm, warning the operator that the feed rate has changed and that appropriate steps to stabilize the system should be taken. In the case of the Expander/Dryer “Low Current” alarm, the operator may find that the Expander/Dryer hopper is blocked and he must initiate a “Controlled” shutdown of the system before an “Over-Temperature” condition results in the Expander/Dryer barrel. An “Over-Temperature” condition in the barrel can quickly cause fires at the die plate, the Hot Box or downstream of the Hot Box. “Over Current” alarms typically indicate an increase in capacity.

就這一點而言，系統正常工作時，推進器和擴張/干燥器電機（電機負載繼電器）應設置高低值（僅當設備包含我們的控制系統時）。碎料注入速度變化時，報警系統就會向操作者報警。對推進器的電機負載降低時，推進器報警“電流低”，警告操作者輸入速度已經改變，應采取適當的措施使系統穩定。擴張/干燥器報警“電流低”時，操作者會發現擴張/干燥器的儲料器堵死。他必須在擴張/干燥器桶中產生過熱之前啟動一個“受控的”系統斷電。擴張/干燥器桶中的過熱很快就會使模盤、熱箱或其后端起火。“過流”報警一般意味著電容降低。

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