Effect of dissolved and colloidal solids on newsprint properties

The effect of the dissolved and colloidal material present in whitewater on newsprint properties was investigated with simulated whitewaters. Physical properties were determined not just by the overall contaminant amount but also by the nature of contaminant, dissolved or colloidal, present in the w hitewater. The tensile strength was most strongly affected by the colloidal solids, while the burst index, bulk and porosity were most strongly affect ed by the dissolved solids in the whitewater Tensile strength was improved by selectively removing the colloidal solids from the whitewater.