THE EFFECTS OF WASTE PAPER CLEANING PROCESSES ON PAPER QUALITY INDICATORS

Abstract

The presence of typographic ink in the waste paper of MS-3 brand
has limited its use in the production of printing paper. Maximum separation
of the dye in it, discoloration of the fiber and increasing a whiteness level is
a vital issue. In these studies, the stages of processing the waste paper mass
in an alkaline environment in order to convert the printing ink to a soluble
state have been studied. It was observed that the waste paper first swells,
then absorbs the alkali, and then a chemical reaction takes place between
the abrasive alkali and the oily substance. It was found that at high
temperatures in an alkaline environment, a waste paper becomes very
swollen, the size of the pores increases, and the diffusion of fatty substances
in the printing ink is facilitated. Alkaline substances have been shown to
hydrolyze waxy substances to form sodium salts of fatty acids. The
efficiency of printing ink from the mass of waste paper under the influence
of alkali was evaluated by the degree of polymerization and capillaryity of
paper castings made from it.