- they are installed in wastewater treatment plants for the transportation of sludge (SDK).
- depending on the conveyor length and the nature of the substance being transported, they are manufactured with shaft (SD) or in a shaftless variant (SD-B) and their screws are either pushed or pulled.
- outdoor variant is equipped with double heated housing.
- conveyor operation is controlled by the control panel, usually together with belt presses and sludge presses.