B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
B31F—MECHANICAL WORKING OR DEFORMATION OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
B31F5/00—Attaching together sheets, strips or webs; Reinforcing edges
B31F5/02—Attaching together sheets, strips or webs; Reinforcing edges by crimping or slotting or perforating
B31F5/022—Attaching together sheets, strips or webs; Reinforcing edges by crimping or slotting or perforating using a rotary tool