Virtually all Slitter Rewinders use some kind of core and wind their slit material onto them. In certain applications, unlike Duplex sitting and winding the cores are all placed on a single rewind shaft. With simplex winding the rewind shaft is driven from the center in a similar fashion to a duplex slitter. This is unlike a Two Drum Winder where the roll is created by two drums driving the surface of the winding roll or a center surface winder where both the rewind shaft and the surface are driven. Two examples of single shaft or “simplex” on our site are the Goebel Rapid D and the Kidder CW. The advantage is mostly higher production as there is only one shaft to unload. These machines require material with little or no stretch and good caliper or thickness control.