Date of Defense

Spring 4-17-1997

First Advisor

Raja Aravamuthan, Paper and Printing Science and Engineering

Second Advisor

David Peterson, Paper and Printing Science and Engineering

Third Advisor

Brian Scheller, Paper and Printing Science and Engineering

Abstract

This thesis deals with a new wash deinking method called deinking through cross-flow filtration. Cross-flow filtration is used in liquid filtering systems to remove contaminants in a slurry. A cross-flow filtration vessel was fabricated by Ronningen-Petter in order to test out this new type of deinking. In this vessel, the inlet flow will be applied to the inside of the filter; pushing the water, ink, and filler that is present in the slurry through the element while retaining the fiber. Different flow rates and consistencies will be tested to determine the feasibility of this method. The flow rates through this vessel will attempt to maintain turbulence in the pipe in order to keep the screen clean and prevent the screen from blinding. Two trials were performed at Western Michigan University's Paper Pilot plant in order to test out the cross-flow filtration vessel. The results showed that the screen removed ink at high consistency and low pressure drops across the screen. High pressure drops across the screen forced fiber as well as ink through the screen in the same proportion, thus just removing a portion of the inlet flow. The screen was able to remove the same size distribution of ink found in the inlet flow. Meaning, the screen did not preferentially remove one size of ink particle better than another. At low consistency the fiber and ink were removed in equal percentages. The vessel was proven to be an inefficient deasher and provided no fiber fractionation.

Access Setting

Honors Thesis-Campus Only

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