USE OF A LASER SENSOR TO CHARACTERIZE ROUGHNESS OF LINERBOARD AND OTHER PAPER GRADES

The 'Laser Table' is an accurate non-contact device that measures surf ace topography directly. It is therefore a useful instrument for measu ring roughness over the roll spectrum of surface variation The design and operation of this instrument is described and the mathematical tre atment of test results covering two-dimensional traces. three-demensio nal topography plots, and an analysis of the valley to peak height dis tribution of a surface. The laser table provides good correlation with Sheffield roughness measured on whitetop linerboard for sample spacin gs above 2mm.