The Relationship between Single-Disk Refining Energy, Strength Properties, and Freeness for Softwood, Hardwood, and Recycled Stock
Date of Award
Master of Science
Chemical and Paper Engineering
Paper Engineering, Chemical Engineering and Imaging
Dr. John Cameron
Dr. Peter Parker
Dr. David Peterson
Masters Thesis-Open Access
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.
Marker, Ken, "The Relationship between Single-Disk Refining Energy, Strength Properties, and Freeness for Softwood, Hardwood, and Recycled Stock" (2003). Masters Theses. 4954.