Date of Award
Bachelor of Science
Paper Science and Engineering
In this study, two centrifugal cleaners -- the C-E Bauer Water-Master and the Beloit Uniflow -- were evaluated to determine the effects of entrained air in the stock on cleaning efficiency. A "neutral" density hot melt contaminant (specific gravity = 0.99) was added to dry lap pulp to simulate a recycled furnish. Various levels of a nonionic surfactant were used to induce foam in the stock; this foam was measured as percent air by volume. The cleaners were operated at a series of air levels and pressure drops, in order to generate characteristic curves. The results of the project indicate that, among the levels examined, addition of 1.4% air by volume generally increased cleaning efficiency; beyond this level, contaminant removal was adversely affected.
Recommendations for further research include exploring a wider range of pressure drops and smaller increments of air levels, and increasing consideration for the regulation of hot melt particle size.
Kane, Karrie L., "The Effects of Air Entrainment in Centrifugal Cleaners on the Removal of “Neutral” Density Contaminants" (1984). Paper Engineering Senior Theses. 206.