3D Measurement of Pulp Slurry behavior by Projected Grating Method(II)

Projected grating method is introduced to measure the three dimensional pulp slurry surface behavior for the estimation of the sheet formation on the fourdrinier. For this purpose, a simple experimental system was composed of the slide projector, video camera, A/D converter and micro computer. The grating image deformed by a flow of pulp slurry on the wire was analyzed and the three dimensional form of the surface of slurry was calculated.As the results, it became clear that the calculated three dimensional form of the surface is considereably influenced by the scattering in the plup slurry, therefore obtained form doesn't represent only the characteristics of pulp slurry surface. However, the method was significant to analyze the variations of pulp slurry behaviour and the effect of the cationic retention aids in the pulp slurry.