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    Author(s): Charles W. McMillin
    Date: 1969
    Source: Wood Science and Technology, Vol. 3: 139-149
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (1.65 MB)


    In Pinus taeda L., burst, breaking length, and sheet density were improved by using fiber refined from wood having long, narrow-diameter tracheids with thick walls. Only narrow-diameter teacheids with thick walls were required to improve tear factor. A theoretical stress analysis revealed that thick-walled cells of small outside diameter fail by diagonal tension or parallel shear, depending on the fibril angle, while under torsional stress during refining. Such failures result in ribbon-like fragments which research elsewhere has demonstrated to provide the coherence necessary for strength development in mechanical pulps. In contrast, thin-walled cells of small outside diameter fail by diagonal compression and yield few ribbons.

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    McMillin, Charles W. 1969. Aspects of fiber morphology affecting properties of handsheets made from loblolly pine refiner groundwood. Wood Science and Technology, Vol. 3: 139-149

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