Study of Dry Fiberization of Waste Paper by Using Dry Milling

Abstract

This study evaluated the fiberization of waste papers by using dry mill treatment, in order to increase the usability of waste paper. The three waste papers such as old news paper (ONP), old corrugated container (OCC), and old office paper (WL, white ledger) were mechanically treated with knife mill and hammer mill. The effects of the types of milling processes on the fiberization efficiency were evaluated by measuring the fiber fractionation and by observing fibers and flakes using a microscopy. The knife mill treatment showed the effective fiberization for ONP. In case of OCC and WL samples, the hammer mill treatment showed the better performance in terms of fiber disintegration than the knife mill treatment. The hammer mill treatment resulted in the less flake and the higher in fines fraction, which leaded to changes in the CSF. There were many differences in the dry fiberization of waste papers depending on the mill treatment types, the treatment conditions and the types of waste papers.