NOVEL STYLUS METHOD FOR MEASURING PAPERS TOPOGRAPHY.

Papers topography is of great importance primarily to the printability. Since papers rarely end as a blank sheet, it is therefore significant how will the print-outs appear. Paper topography was evaluated with standard stylus technique, i.e. profilometer TR200, novel contact stylus method, i.e. »Instron« and non-contact method, i.e. 3D laser scanning microscopy. Because of the high processing velocities, the non-contact techniques are industries preferable way of performing standard measurements. In case of a paper production, paper mills have one mayor problem with on- or off-line optical measuring units. Since the nature of the paper production is overall mixture of water, calcium carbonate, latex etc., particles, i.e. fuzz, that is present in the surrounding atmosphere along the paper machine, therefore surface of optics on measuring on-line unit tends to get dirty and capturing accurate data is due to the working environment aggravated. Consequently, the novel stylus method has been developed for measuring paper roughness. In the basic, the novel method is an upgrade of standard technique used on dynamometers for measuring friction force. Afterwards the friction force is transformed into the parameters, normally used when presenting surface roughness, i.e. R_a, R_q, R_p and R_v. [ABSTRACT FROM AUTHOR]