Date of Award
Bachelor of Science
A three stage bleaching sequence for a mixture of recycled chemical and groundwood fibers was investigated for maximum brightness increase. The three stages consisted of a reducing or color stripping stage, an oxidizing stage, and last a mild alkaline extraction. The variables in this thesis and pH conditions in each stage and bleaching agent concentrations of each stage. At more alkaline pH's and higher concentrations of hydrogen peroxide there was the greatest increase in brightness. The was no observed effect of altering the concentration of the reducing agent.
Buck, Ronald J., "Three Stage Bleaching of Recycled Fibers Containing 30% Groundwood" (1978). Paper Engineering Senior Theses. 54.