Pile comprising a plurality of filter paper sheets

Abstract From the Canadian patent

If a plurality of essentially circular sheets of filter paper are stacked in a pile, the individual sheets have a tendency to stick to each other rendering it difficult to remove the topmost sheet from the pile. To overcome this inconvenience it is pro-, vided that adjacent sheets within the pile have a different contour, e.g. by providing every second sheet with a protruding tongue arranged at the circumferential edge thereof. All the intermediate sheets either do not have such tongue or are provided with a recess arranged anywhere along their circumferential edge.