| 摘要 |
PURPOSE:To rapidly perform measurement and to enhance the response of roll gap control to the change of a gauge, by directly detecting the thickness of a sheet on a calender roll by a simple thickness detector. CONSTITUTION:From scanning average values Tz, Bz, Uz of the measured value of the thickness Ti of the sheet main body 5 after coating, the measured value Bi of a lower sheet 5b and the measured value Ui of a simple thickness detector 10, Z=Tz-Bz-Uz is calculated at every scanning by a subtraction circuit. The thickness of the upper sheet 5a, until the next scanning is finished, is set to Ui+Z by the instantaneous value Ui and average value Z of the simple thickness detector 10. That is, the 0 point of the simple thickness detector 10 is corrected by Z so as to allow the direct measured value of the upper sheet 5a by the detector 10 to coincide Tz-Bz. This correction is performed every when detectors 6, 7 scan the sheet main body 5 in the lateral direction thereof.
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