Patent ID: 8621966

Claim:
A method of perforating a web comprising, providing a web, passing the web through a nip, wherein the nip is defined as a contact point between a cutting edge and an anvil surface, the cutting edge comprising a portion of a knife roll and the anvil surface comprising a portion of an anvil roll, the anvil roll being adapted to rotate about an anvil roll axis, the knife roll being adapted to rotate about a knife roll axis, the anvil surface comprising a plurality of grooves separated by a plurality of lands, the plurality of grooves being angled and having variable groove widths, perforating the web in the nip at a first machine direction cutting position by pressing the cutting edge against the web and the anvil surface to cut the web at the lands and to maintain the web at the grooves, and phasing the cutting edge relative to the anvil surface to perforate the web at a second machine direction cutting position wherein the grooves have a first width at the first machine direction cutting position and have a different second width at the second machine direction cutting position.