A method of reducing critical dimension is provided. The stacking apparatus includes a discharge magazine for sequentially receiving and stacking the flat articles face-to-face in an on-edge stack. On the end face of the radial breading opposite to one side of the radial projection, there is formed a first dynamic pressure producing recess which produces a dynamic pressure by the viscous fluid. The coating forms a three layered paper having an I-beam arrangement with high strength outer layers surrounding a low density core.