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There are many variations on the basic perforated plate screen. As the understanding of the importance of chip thickness has grown, so as the adoption of disc screens. In this type screen, several parallel shafts each with a series of closely spaced steel discs mounted on them are arranged to create a roughly horizontal surface. The shafts are spaced such that the discs slightly overlap. This creates screening slots between the discs. All of the shafts rotate in the same direction. Profiles on the perimeter of the discs jostle the chips. If the chips are thin enough, they fall between the discs. If they are too thick, they are pushed over the rows of discs and off the end of the screen. Some systems employ a disc screen as a primary thickness screen after the scalping screen to remove over thick chips.