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In this work, the American Old Corrugated Containers (OCC) pulp was screened using pressure screen to investigate the factors affecting the fractionation performance. Three screen cylinders with different geometries, aperture size/contour heights, volumetric reject ratios, and aperture velocities were used. The results showed that the passing ratio of fibres increased with the increase of contour height, volumetric reject ratio, and aperture velocity for all the three screen cylinders. Moreover, among the three cylinders investigated, the 0.81 mm hole cylinder achieved the highest fractionation efficiency with a volumetric reject ratio of 0.1 followed by 0.15 and 0.2 mm slot screens. Freeness change of the accept side of the screen was similar to passage ratio, which shows an increasing trend with the increasing aperture velocity and volumetric reject ratio. However, the reject freeness showed decreasing trends with the increasing aperture velocityVs{V_{s}}    and volumetric reject ratioRv{R_{v}}   .

Insight into fractionation performance of American old corrugated containers pulp in pressure screening