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Thursday, May 14, 2020 | History

3 edition of Properties related to drying defects in red oak wetwood found in the catalog.

Properties related to drying defects in red oak wetwood

Properties related to drying defects in red oak wetwood

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  • 33 Currently reading

Published by U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory in Madison, WI (One Gifford Pinchot Dr., Madison 53705-2398) .
Written in English

    Subjects:
  • Wood -- United States -- Testing,
  • Red oak,
  • Nondestructive testing

  • Edition Notes

    StatementErkki Verkasalo ... [et al.]
    SeriesResearch paper FPL -- RP- 516, Research paper FPL -- 516
    ContributionsVerkasalo, Erkki, Forest Products Laboratory (U.S.)
    The Physical Object
    Pagination10 p. :
    Number of Pages10
    ID Numbers
    Open LibraryOL14443306M
    OCLC/WorldCa28152341

      Verkasalo E, Ross RJ, TenWolde A, Youngs RL () Properties related to drying defects in red oak wetwood Res. Pap. FPL-RP Forest products laboratory, Madison Google Scholar Vun RY, Hoover K, Janowiak J, Bhardwaj M () Calibration of non-contact ultrasound as an online sensor for wood characterization: effects of temperature, moisture Cited by: 4. In regions with some kind of a heating climate (as I do), wood needs to have a 7% to 9% moisture content to prevent projects from warping and cracking during the driest part of the heating season. This requires a second drying phase, and skipping this step is where most moisture-related trouble starts. You can store lumber in a barn or unheated.

    *A method of calculating internal stresses in drying wood. ^Bending solid wood to form. ^Mechanical properties of red oak related to drying. *How wood shrinks and swells. * T h e perpendicular -to -grain mechanical properties of red oak as related to tempera- ture, moisture content, and time. wood-affected oak trees in the forest. Mild- drying schedules can be applied to wetwood- affected lumber to reduce drying defects if it is identified and separated from healthy lum- ber before drying. However, it is difficult to recognize the presence of wetwood in red oak boards on the green chain during the milling by:

    Drying Time for 6/4 Red Oak Here's a quick technical look at the factors affecting kiln drying 6/4 Red Oak, including kiln type and initial moisture content. Air drying may be more cost-effective. J Using Air-Dried Lumber for Furniture There are risks, but . PROPERTIES OF WOOD RELATED TO DRYING-, southern yellow pine is considerably less than that required to kiln-dry oak to the same moisture content. 1This chapter of a Dry-kiln Operator's. Manual was prepared by Edmund F. wood in the tree, and it is almost impossible to dry such wood without drying defects.


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Properties related to drying defects in red oak wetwood Download PDF EPUB FB2

Tensile strength across the grain, as related to drying defects (checks, splits, collapse, warp) of bacterially infected and uninfected red oak lumber.

The first objective of this study was to show the potential of using these properties to indicate bacterial infection in green lumber. The second objective was to evaluate. Low tensile strength across the grain in bacterially infected red oak strongly indicates a high susceptibility for the lumber to check during drying.

Because decreased tensile strength is indicated by increased stress wave travel time, stress wave analysis of green lumber can be a good indicator that drying defects will also develop.

Publisher: Madison, WI (One Gifford Pinchot Dr., Madison ): U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory. Bacterial wetwood is a major cause of value loss in the red oak lumber industry in the United States.

Red oak trees in Mississippi, South Carolina, and Florida were sampled and evaluated for certain chemical properties possibly associated with the wetwood condition.

Properties related to drying defects in red oak wetwood By E. Verkasalo, R.J. Ross, A. TenWolde and R.L. Youngs Get PDF (1 MB). hardwood sawtimber in eastern forests is in the red oak spe-cies group.

It has been estimated that bacterial wetwood causes annual losses due to drying defects in oak lumber of about million board feet (Ross et al. Clearly, with this much economic value at stake, the development of ing limits the drying rate; rapid drying causes defects such as surface and internal checks, collapse, splits, and warp.

Drying time and susceptibility to many dry-ing defects increase at a rate that is more than pro-portional to wood thickness. The variability of wood properties further complicates drying. Each species hasFile Size: KB. he presence of wetwood in lumber is a severe process-ing problem for the lumber industry.

Wetwood, which is also known as bacterially infected wood, causes serious drying de-fects such as excessive and deep surface checking, honey-comb, collapse, and ring separation.

The wetwood-related drying defects in oak lumber alone are as much as millionCited by: 7. tor to take action to keep these defects at a minimum. Kiln drying is frequently blamed for defects that have occurred during air drying, but most defects can oc-cur during either process.

In kiln drying, defects can be kept to a minimum by modifying drying conditions, and in air drying. Drying defect - "A drying defect is any characteristic or blemish in a wood product that occurs during the drying process and reduces the product's intended value." Drying degrade - A defect which lowers the lumber's grade.

Wood has many natural defects; knots, bark, mineral streak, pitch pockets, compression & tension wood, spiral or interlocked grain etc.

Properties related to drying defects in red oak wetwood. Madison, WI (One Gifford Pinchot Dr., Madison ): U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory, [] (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors.

Mechanical Properties of Clear Straight-Grained Wood 4–26 The moduli of elasticity and Poisson’s ratios are related by expressions of the form Maple, red — Oak, red — File Size: 1MB.

Stress wave nondestructive evaluation of wetwood No. 7/8 wood-related drying defects in oak lumber. losses can total as much as × 10 6 board feet (nominal x 10 6 m 3) per year and. I am drying red oak (I don’t know the exact species) and would like information on how fast/slow it should be dried to avoid drying defects.

I made a dehumidification drying kiln. The kiln dimensions are ” x 39” x 36” with a heat/dehumidification area of 24” x 39” x 36” and a drying box of ” x 39” x 36”. of wetwood-related drying defects in oak lumber, losses can total as much as × board feet (nominal × m3) per year and cost as much as $25 1 Ross, R.

J., J.C. Ward, and A. TenWolde. identifying bacterially infected oak by stress wave nondestructive evaluation. FPL-RP USDA Forest Serv., Forest Prod. Lab., Madison, Wis. Drying schedules at high temperatures were also reported to decrease mechanical properties and increase drying defects (Oltean et al.

In this connection, many studies have been carried out. In white fir, wetwood is the usual condition of the heartwood.

It is characterized by a moisture content generally equal to or greater than that of sapwood, a slightly lower pH, and a red-brown color. This paper reports moisture content (MC), SG, shrinkage, tension strength perpendicular to the grain (TPG), stress wave travel time (SWTT), and drying properties associated with wetwood in red oaks from South Carolina and Mississippi compared to normal trees, and the potential utility of these properties for wetwood identification.

There are innate defects caused by the natural characteristic of wood to shrink or expand in response to water vapor in the air. And, there are artificial and mechanical defects caused by incorrect sawing or machining (conversion), improper drying (seasoning), or improper handling and storage. However, the Hardwood Research Council estimates that as a result of wetwood-related drying defects in oak lumber, losses can total as much as x 10 6 board feet (nominal x m 3) per year and cost as much as $25 x per year (John A.

Pitcher, personal communi- cation). Properties Related to Drying Defects in Red Oak Wetwood by Erkki Verkasalo, Robert J. Ross, Anton TenWolde, and Robert L. Youngs. USDA Forest Service FPL Research Paper FPL-RP USDA Forest Service FPL Research Paper FPL-RP   Wetwood, which is also known as bacterially infected wood, causes serious drying defects such as excessive and deep surface checking, honeycomb, collapse, and ring separation.

The wetwood-related drying defects in oak lumber alone are as much as million board feet, which costs the lumber industry about $25 million per year (Murdoch ).Properties Related to Drying Defects in Red Oak Wetwood. A FPL - RP - Stiffness and Strength Properties of Shear Transfer Plate Connections.

A FPL - RP - Measurement of Flake Alignment in Flakeboard with Grain Angle Indicator. A FPL - RP - Performance of Red Maple Glulam Timber Beams.