Date of Award


Degree Name

Bachelor of Science


Paper Science and Engineering


Investigation of badly contaminated paper as a source of secondary fiber is an area of growing interest to the paper industry. A process that can remove contaminates from high gloss, printed, waxed, and/ or polycoated specialty paper is the experimental part of this thesis.

A brief overview of major factors involved in secondary fiber recycling will be discussed, such as economic factors, new demands, and pressures placed on the recycling industry. (1, 2, 3)

Different methods of contaminate removal and deinking techniques are discussed with a listing of advantages and disadvantages of each. (The methods include principles involved in absorbing ink particles on hydrophobic collectors, (7, 11) removal of wax and poly, (9, 10, 11, 12, 15) and handling the problem of other contaminates such as grease, wet strength resins, asphalt and/or similar materials. (8, 12, 16) Problems caused by synthetic coatings and adhesives are also briefly discussed.(6) The relatively new concept of ultrasonic deinking will be mentioned. (13) Laboratory methods of testing and evaluating the quality of deinking system is also included. (14)

The experimental part of this thesis is based on the literature cited, and will investigate the efficiency of a combination solvent-aqueous deinking method on printed waxed papers. The efficiency will be evaluated by brightness measurements and speek analysis, with a brief look at yields.