| 摘要 |
PROBLEM TO BE SOLVED: To manufacture a hot-dip coated band steel with a stable surface without a spangle by adjusting a height of the spangle-suppressed apparatus according to a wet state of the surface of the band steel and spraying spangle suppressing chemical liquid under a specified condition. SOLUTION: The spangle-suppressed apparatus MS is set up to a height H which is calculated by a setup model formula using an operating condition as a factor. The surface of the band steel sent out from the spangle-suppressed apparatus MS is observed during the operation with a industrial camera 3 which moves up and down synchronizing with the spangle-suppressed apparatus MS. An L/D ratio is calculated by an image processing of the observation results by the wet state judging apparatus 4. When the L/D ratio is not in a proper range, a judgment result s<SB>3</SB>is output to a height computing unit 1, and a corrected height d<SB>2</SB>is calculated by the height computing unit 1. By outputting the corrected height d<SB>2</SB>to an up and down movement controlling device 2, and controlling up and down movement of the spangle-suppressed apparatus MS, the spangle-suppressed apparatus MS is always maintained to the proper height. COPYRIGHT: (C)2003,JPO
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