Date of Award
Bachelor of Science
Pulp and Paper Technology
Present industrial methods for the bleaching of groundwood are discussed. The conditions and chemicals used for hypochlorite, sodium and zinc hydrosulphite, bisulphite and sodium and hydrogen peroxide bleaching are reviewed. Consistencies, retention time, pH and temperature for maximum brightness are discussed for each process. Chemical reactions for the removal of color are given for several of the processes.
Hedquist, Dale C., "The Bleaching of Groundwood" (1960). Paper Engineering Senior Theses. 290.