Study about the Evaluation Method of Gloss Unevenness

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<p>The system consisting of a line light source, a line scan camera, and a movable stage was used to evaluate the gloss unevenness of coated paperboards. The pattern of gloss obtained from the images was matched with the gloss unevenness obtained by visual test. By frequency analysis of the images, the amplitude at the specific frequency (wavelength was around 6mm) had strong correlation with the gloss unevenness of visual test. It indicates that this system is available for evaluating gloss unevenness and analyzing its cause. Also, by the result from paper formation measurement, the major cause of gloss unevenness was the uneven formation of base paper. Furthermore, the sheet formation of the surface layer of the coated board had much more influence to the gloss unevenness than that of the middle layer.</p>

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  • 紙パ技協誌

    紙パ技協誌 70 (11), 1184-1188, 2016

    紙パルプ技術協会

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