Date of Award

4-1981

Degree Name

Bachelor of Science

Department

Paper Science and Engineering

Abstract

The purpose of this study was to increase the operating consistency of The FINCKH pressurized screen. The main objective was to obtain good, efficient pulp cleaning at consistencies greater than 0.8%, and to observe the fractionating ability of the screen.

Cleaning efficiencies based on the removal of shives present in Groundwood were obtained in the order of 45%. Control runs were made at 0.7% consistency.

Installation of a linoleum volute - shaped element on the feed side of the screening zone, increased the velocity of the stock at low consistency (0.7%) without affecting the cleaning efficiency. At high consistency (1.26%) the volute induced excessive dewatering of the feed stock which led to total screen blinding. Different approaches to inducing high shear forces in the inlet side of the screening zone are recommended.

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