ELONGATE SHEET MATERIAL THICKNESS MEASURING METHOD AND THICKNESS MEASURING SYSTEM

摘要

[PROBLEM] To provide a method of measuring the thickness of long sheet material and a thickness measuring system, that measures the thickness of paper separately for a component in a machine direction and a component in a cross direction without scanning or filtering, that does not require a conventional basis weight sensor using a radioisotope and can be applied even to small paper machines. [SOLUTION] The method of measuring the thickness of long sheet material W wound on to a reel spool 16 while being pressed by a reel drum 12, includes: measuring the increase in the roll diameter of a wound roll R formed from the long sheet material W in a non-contact manner; measuring the number of rotations of the reel spool 16; and determining the thickness of the long sheet material by calculation using the measured increase in the roll diameter and the number of rotations.