| 摘要 |
PROBLEM TO BE SOLVED: To prevent the surfaces of both metal rolls of a pair from being hurt and the quality of a sheet subjected to calender treatment from being influenced when foreign matter such as falling substances and dust from the sheet are mixed between the metal rolls in a calender treatment apparatus in which the sheet is passed through a pair of the metal rolls to be pressed. SOLUTION: The Vickers hardness Hv of the surface of one metal roll Ma of a pair of the metal rolls is at least 900 and is made to be by at least 150 larger than the Vickers hardness of the surface of the other metal roll Mb.
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