An apparatus for the opening-up and cleaning of cotton waste, especially strips, card fly and scutcher material and the like with a fiber material draw-in roller for feeding the fiber material to be cleaned to a saw tooth barrel the peripheral portion of which includes an opening-up section for opening-up the fiber material to be cleaned into individual fibers. When viewing the saw tooth barrel in its direction of rotation, the opening-up section is followed by a fiber material take-off roller rotatable in a direction counter to the direction of rotation of the saw tooth barrel. The apparatus furthermore includes a conduit having an inlet adjacent the peripheral surface of the saw tooth barrel for receiving fiber material therefrom and having an outlet for connection to a fiber material collecting container.
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