| 摘要 |
A curl straightening method in an image apparatus including a fixing apparatus (30, 37) and a curl straightening apparatus (40) is disclosed. The method includes calculating moisture content of a sheet before being supplied to the fixing apparatus; measuring a temperature of a heating unit (30) and a pressurizing unit (37); calculating a temperature and moisture content of the sheet in the respective conveying sections; calculating a conveying time of the sheet in the respective conveying sections; calculating a residual strain of the sheet in the respective conveying sections from the calculated temperature and the moisture content of the sheet in the respective conveying sections, the calculated conveying time, and the stress relaxation characteristics of the sheet; calculating a final curl amount using the calculated residual strain of the sheet in the respective conveying sections; and controlling the curl straightening apparatus (40) based on the final curl amount obtained. |
