HEAT AND MOISTURE TRANSPORT IN PAPER GOING THROUGH A HOT ROLL NIP, 2008 PAPERCON Conference

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Paper sheets are subjected to a temperature pulses in the fuser section of photocopiers and digital printers. The response of the sheet to a transient thermal pulse depends on its thermal and moisture conduction properties. We present the analysis of a thermal pulse typical of the fuser section in photocopiers and laser printers using a simple one-dimensional mathematical model to simulate the temperature and moisture content fields. The model predicts that the surface temperatures of the paper sheets attain the fusing temperatures rapidly in the nip region. The cooling of the paper sheets after fusion depends strongly on their thermal and moisture transport properties and the external heat and mass transfer coefficients to the environment. We investigated the temperature and moisture content fields for several coated and uncoated copy papers based on thermal property measurements conducted independently.