Compaction apparatus comprising a screw conveyer and an exit nozzle of the conveyer having an elastic restriction

摘要

A compaction apparatus (2) has a screw conveyor (4) for conveying, waste material through a passage (6) and compacting it therein. An exit nozzle (10) is arranged to communicate with the passage (6). The nozzle (10) has a transverse internal cross-sectional area which enlarges and reduces respectively in response to increasing and decreasing material pressure