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The slitter section of a winder typically includes multiple sheet guiding and support rolls, the slitters themselves, the spreader rolls before and after the slitters. The slitters cut the sheet into the desired roll widths, and also trim off the front and back edges. Depending on the grade, the number of slitters can vary from three or four up to 20 or more. Slitting is typically accomplished by multiple pairs of rotating knives mounted on shafts or rails. The cuts or slits are made at the points where the top and bottom slitter knives make contact. On paper and board machine winders, the top slitters are typically circular blades and the bottom slitters are usually bands.