Author

Marker

Date of Award

4-2003

Degree Name

Master of Science

Department

Chemical and Paper Engineering

Department

Paper Engineering, Chemical Engineering and Imaging

First Advisor

Dr. John Cameron

Second Advisor

Dr. Peter Parker

Third Advisor

Dr. David Peterson

Access Setting

Masters Thesis-Open Access

Abstract

Statistical and graphical analysis techniques were applied to disc refining operations in order to understand the relationship between strength and drainage properties for a given stock. Two refining variables of refining energy and revolutionary velocity were varied during the experiment. The calculated variable of refining intensity was used to represent these refining variables. The relationship between the refining energy, strength, and drainage properties for northern softwood, northern hardwood, and printing grade recycled stock was explored. Experimental pulp was obtained on a Beloit Jones Single-Disc refiner, and a handsheet study was used to develop the relationship with strength properties. Several empirical equations were derived relating the strength and freeness properties to the refining variables using MiniTab. Refining energy was the most useful predictor of strength and drainage. Refiner Intensity was not able to significantly represent the interaction of the refining energy and revolutionary velocity. Also, revolutionary velocity showed a weak correlation to the dependant variables. For recycled stock, strength and drainage decreased rapidly as compared to hardwood and softwood. More work should be done to compare this data with other similar experimentation.

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