Patent ID: 6968769

Claim:
A die assembly for cutting a sheet material comprising: a first die including a first die surface and a first cutting rib extending from the first die surface, the first cutting rib including a first cutting surface that is generally parallel to the first die surface, the first cutting rib including at least one leg extending from the first die surface to the first cutting surface at a first obtuse angle relative to the first die surface; and a second die including a second die surface and a second cutting rib extending from the second die surface, the second cutting rib including a second cutting surface that is generally parallel to the second die surface, the second cutting surface being generally parallel to and defining a cutting overlap with the first cutting surface at a cross section taken through the first and second dies in a cutting position, the second cutting rib including at least one leg extending from the second die surface to the second cutting surface at a second obtuse angle relative to the second die surface.