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    Author(s): Charles W. McMillin
    Date: 1969
    Source: Wood Science and Technology, Vol. 3: 287-300
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (2.38 MB)


    Pulp quality, in terms of a fiber shape factor S and a fiber length factor L, was determiend for 96 pulps disk-refined from chips of varying characteristics. S was evaluated in terms of the Canadian Standard Freeness of the 48/100 fiber length fraction and is a parameter inversely proportional to specific surface. L is the percentage, by weight, of pulp retained on a 48-mesh screen and reflects the distribution by weight of fiber length in the whole pulp. S and L accounted for as much as 83 percent of the variation in handsheet properties. Properties were improved by using pulps displaying low values of S and relatively high valuyes of L. both S and L were related to specific refining energy and wood quality. S increased with increasing unextracted chip specific gravity and rings per inch of growth rate but decreased with increasing latewood content and refining energy. L decreased with increasing refining energy, rings per inch of growth rate, and unextracted chip specific gravy but increased with increasing latewood.

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    McMillin, Charles W. 1969. Quality of refiner groundwood pulp as related to handsheet properties and gross wood characteristics. Wood Science and Technology, Vol. 3: 287-300

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