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In page Rotopress:

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The Rotopress is a continuously compacting drum typically mounted on a garbage truck chassis (replacing the large trash storage); it is a massive rotating drum that compacts and stores the garbage.[1] The outer edge of the drum acts as the loading hopper, and paddles on the drum convey the waste around an auger of decreasing pitch until it is small enough to be forced through a small ring-shaped gap between the drum and the auger, where it then enters the main section of the drum, which has helically shaped internal paddles which move the now-crushed waste towards the front of the vehicle.[citation needed] When emptying the drum, the direction of rotation is reversed.[1]