Fractionation of the OCC Pulp and the Effect of Mixing the Fractionated OCC Pulps with Kraft Pulp on the Physical and Mechanical Properties of Paper

In this research, fractionation of OCC pulp was investigated. Also, the effect of refined long fiber fraction of OCC pulp blended with virgin kraft pulp on the strength of pulp was studied. The results showed that mixing the refined long fiber fraction of OCC pulp with virgin kraft pulp increased the strength of pulp. Using fiber classification method and refining the long fiber fraction of OCC pulp showed that handsheets containing 30-50 percent refined long fiber fraction of OCC pulp showed higher mechanical strengths comparing to virgin kraft pulp. Also, in comparison with virgin kraft pulp, mixing the short fiber fraction of OCC pulp with virgin kraft pulp decreased porosity and increased air permeability of hand sheets.