In rewind slitting (recoiling) the web is unwound and run through the machine, passing through knives or lasers, before being rewound (recoiled) on one or more shafts to form narrower rolls. The multiple narrower strips of material may be known as mults (short for multiple) or pancakes if their diameter is much more than their width. For rewind slitting (recoiling) the machine used is called a slitter rewinder (recoiler), a slitter or a slitting machine – these names are used interchangeably for the same machines. For particularly narrow and thin products, the pancakes become unstable, and then the rewind (recoiling process) may be onto a bobbin-wound reel: the rewind (recoiling) bobbins are much wider than the slit width and the web oscillates across the reel as it is rewound (recoiled). Apart from the stability benefit it is also then possible to put very long lengths, (frequently many tens of kilometres), onto one bobbin.
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