Abstract
Paper shrinking after fusing process by moisture evaporation causes the degradation of print quality that is miss-registration of duplex printing in electrophotography. Though this phenomena has been recognized, the detail of the shrinking has not been measured. In this report, the paper shrinking is measured at 4-positions by an experimental apparatus. It shows the shrinkage difference between the front side and the back side of a sheet of paper. A calculation model to reveal this phenomena is proposed, which takes account of the laminar boundary layer on paper surfaces. The calculation result shows the tendency of the shrinking difference, though the shrinking at the front region of the sheet is larger than the experiment. It can be concluded that the laminar boundary layer is created on the paper surfaces after fusing process.
