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    Author(s): Gary F. Leatham; Gary C. Myers
    Date: 1990
    Source: Tappi journal. (Apr. 1990): pages 192-197.
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (132 KB)


    Recently, we showed that a biomechanical pulping process in which aspen chips are pretreated with a white-rot fungus can give energy savings and can increase paper sheet strength. To optimize this process, we need more efficient ways to evaluate the fungal treatments. Here, we examine a method that consists of treating coarse refiner mechanical pulp, refining in a PFI mill, and testing for freeness. The relative ability of a fungus to promote a decrease in pulp freeness in the PFI mill did not correlate with its ability to give energy savings in chip refining. However, it correlated with the ability to increase the strength properties of handsheets produced from the chips. We discuss (a) why the PFI mill method successfully predicts strength properties rather than energy savings, (b) the limitations of the method, and (c) the implications of these results for developing a method to predict energy savings.

    Publication Notes

    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Leatham, Gary F.; Myers, Gary C. 1990. A PFI mill can be used to predict biomechanical pulp strength properties. Tappi journal. (Apr. 1990): pages 192-197.


    Pulping, pulps, strength, wood pulp, mechanical pulping, biotechnology, screening, physical properties, biopulping, white rot, fungal treatments, biomechanical pulping

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