Abstract
In order to gain a quantitatively better understanding of the surface characteristics of paper and coated paper, the fundamental significance and the evaluation of surface profilograms obtained from a stylus method have been studied on the basis of morphological observation.
It has been observed in comparison with scanning electron micrograph of the corresponding specimen surface that the profilogram shows good reproducibility of relatively large void originated from fiber-fiber pockets. Furthermore, it is important to note that the stylus cannot register the fine structure on the fiber and coated layer surfaces because of its scratching.
Since the surface void distribution measured on the cross direction is nearly equal to that measured on machine direction, it is possible to calculate the surface void volume from the profilogram. Thereby, it is convenient to express the profilogram as a cumulative void distribution curve, an Abbott's bearing-area curve, for understanding of actual circumstances of the surface void.
In a serial light-weight coating experiment, the leveling effect of the coatings has been investigated by a stylus method, and the relationship between the surface void volume and the coating weight is successfully discussed with taking account of internal void connected with the surface void.
