Date of Award


Degree Name

Bachelor of Science


Paper Science and Engineering


The fractionation of pulp is not a new idea. As early as 1946, Hill and Coghill developed an apparatus to fractionate pulp into several portions (V.). At present, fractionation is being used in the secondary fiber industry. Long fibers are separated from short fibers and fines to produce linerboard and corrugating medium. The fines fraction has always been of interest to the paper making industry. Fines account for almost all of the BOD in paper mill effluent. This fraction is also important in formation of the sheet and in the sheet strength. Using the fines fraction of pulp for the improvement of retention by adding the filler and retention aid to this fraction is a relatively new development that has not been thoroughly researched.