Slitter rewinding machines are used to slit a single and wider reel of web into several narrower reels of materials. Machines may have different constructions depending on: the type of material, its dimensions and the key performances required. For instance some will have a winder with twin shaft (duplex two shaft) or double turret slitter rewinder. Some others will have construction with an independent couple of arms holding each winded reel. Others will use a two-drum winder.