Performance of Enzymatically Deinked Wastepaper on Paper Machine Runnability, 1995 Pulping Conference Proceedings

Kathie Rutledge-Cropsey, Said M. Abubakr, & John H. Klungness

USDA Forest Service Forest Products

The process of enzymatic deinking has been proven to be an effective method for removing noncontact inks from wastepaper. A secondary effect of enzyme treatment is enhanced pulp drainage. This study investigated the effects of enzymatic deinking on paper machine runnability, spe-cifically drainage and wet-web strength enhancement. Three deinking trials were conducted on industrial-scale equip-ment. Two trials used the enzymatic deinking method developed at the Forest Products Laboratory, and one trial was a surfactant control. Pulp produced in each of the three trials was used in a pilot paper machine run. During each paper machine run, overall runnability, drainage, pressing response, and wet-web strength were evaluated. In general, the enzyme-reacted pulp ran better than the control pulp. Mainly, it was the enhanced drainage and wet-web strength that contributed to the improvement in runnability.