Perforation blade for perforating tissue products

A process for perforating a sheet material comprising:

• feeding a sheet material between an anvil and a perforation blade, the perforation blade and the anvil contacting each other periodically for forming corresponding perforation lines in the sheet material, the perforation blade comprising a blade member that has a length and terminates along an edge, the edge defining a plurality of teeth configured to contact a sheet material and form perforations, each tooth including a sheet contacting surface having a width for creating more than one point contact with a sheet material thereby forming a perforation line into a sheet material, the teeth being spaced apart along the edge and being separated by recesses, each recess being bordered by two side walls of two adjacent teeth, each recess having a width along the edge of the blade member and a depth that extends along the bordering side walls, and wherein each side wall within each recess is slanted at a non-zero angle in relation to a longitudinal axis that intersects the side wall and extends perpendicular to the perforation blade edge, the non-zero angle being from 2° to about 40° , wherein the sheet contacting surface of each tooth has a width of from about 0.05 inches to about 0.2 inches.