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    Author(s): William T. Simpson; Xiping Wang
    Date: 2005
    Source: Undervalued hardwoods for engineered materials and components. Madison, WI : Forest Products Society ; Marquette, MI : Northern Initiative, [c2005]: Pages 51-63.
    Publication Series: Book Chapter
    PDF: View PDF  (198 KB)

    Description

    Traditional hardwood lumber drying processes were developed for appearance-type products such as furniture, cabinetry, and millwork. This means that air-drying practices were managed to minimize the chemical and fungal stains that occur in white woods such as maple, as well as surface checking that is common in some species. It also means that the kiln schedules which were developed are conservative, slow, and designed to virtually eliminate even minor drying defects such as small surface checks or discolorations. In structural products, surface checks and discoloration do not detract from utility. They are not considered defects in softwood structural lumber grading rules. Therefore, for structural lumber, air-drying and pre-drying practices can be relaxed and kiln schedules can be more severe, faster, and more efficient than traditional hardwood schedules.

    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.

    Citation

    Simpson, William T.; Wang, Xiping. 2005. Chapter 5:Drying and heat sterilization of maple lumber for structural uses. Undervalued hardwoods for engineered materials and components. Madison, WI : Forest Products Society ; Marquette, MI : Northern Initiative, [c2005]: Pages 51-63.

    Keywords

    Hardwoods, heat treatment, drying, lumber, maple, pest control, sterilization, wood moisture, heating time, moisture content, drying schedules, air drying, kiln drying, heat sterilization

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https://www.fs.usda.gov/treesearch/pubs/31652