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    Author(s): Dennis E. Gunderson; John M. Considine
    Date: 1986
    Source: Proceedings of the 1986 International Process and Materials Quality Evaluation Conference. Atlanta : Tappi Press, 1986: pages 245-251.
    Publication Series: Miscellaneous Publication
    PDF: Download Publication  (107 KB)

    Description

    “Both the strength and stability of compressively loaded paperboard are known to be adversely affected by cyclic changes in relative humidity. Current research at the Forest Products Laboratory (FPL) seeks to observe and explain this phenomenon and to develop a simple, practical test to determine allowable "working loads" in cyclicmoisture environments. A new research apparatus has been developed to measure creep strain, stiffness, and strength in constant and changing humidity environments. Early results link cyclic change in relative humidity with significant loss in compressive strength and suggest the existence of a critical load value above which cyclical humidity changes are progressivelydestructive to the integrity of the web structure. Current efforts are directed toward evaluating the relationship between strength loss, creep load, rate of humiditychange, and number of humidity cycles. We anticipate this work will result in a method for "derating" the compression strength of paperboard when used in applications involving changes in moisture content.”

    Publication Notes

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    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.

    Citation

    Gunderson, Dennis E.; Considine, John M. 1986. Measuring the mechanical behavior of paperboard in a changing humidity environment. Proceedings of the 1986 International Process and Materials Quality Evaluation Conference. Atlanta : Tappi Press, 1986: pages 245-251.

    Keywords

    Mechanical properties, creep, moisture, paperboard, strength, humidity, strain, transient effects

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