Date of Award


Degree Name

Bachelor of Science


Paper Science and Engineering


The following study reports the performance of polyethylene and polystyrene in two different forms as ink collectors during deinking. Following a brief case history of conventional deinking and a detailed discussion of deinking with plastic as an ink collector, many variables affecting this process are analyzed. Although the results were somewhat eratic, some generalizations can be made. The polystyrene in the porous form provided maximum ink removal. This can be attributed to its ability to retain adsorbed ink particles. Regardless of the system used, ink removal increased with additional collector surface area. Nevertheless, some re-dispersion of ink particles was evident at longer collection times. The separation of the plastic particles from the pulp following deinking was easily achieved due to their buoyant characteristics.

Over-all, the plastic used in this study at the amounts economically feasible were inadequate by themselves to obtain desirable brightnesses. It is suggested that this process be used along with conventional deinking to obtain high brightness recycled pulp.