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Wednesday, July 22, 2020 | History

3 edition of Estimating air drying times of samll-diameter ponderosa pine and Douglas-fir logs found in the catalog.

Estimating air drying times of samll-diameter ponderosa pine and Douglas-fir logs

William Turner Simpson

Estimating air drying times of samll-diameter ponderosa pine and Douglas-fir logs

by William Turner Simpson

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  • 27 Currently reading

Published by U.S. Dept. of Agriculture, Forest Service, Forest Products Laboratory in Madison, WI .
Written in

    Subjects:
  • Lumber -- Drying

  • Edition Notes

    StatementWilliam T. Simpson, Xiping Wang.
    SeriesResearch paper FPL -- 613.
    ContributionsWang, Xiping., Forest Products Laboratory (U.S.)
    The Physical Object
    Pagination14 p. :
    Number of Pages14
    ID Numbers
    Open LibraryOL17618788M
    OCLC/WorldCa54409155

      Estimating air drying times of small-diameter ponderosa pine and Douglas-fir logs. Research Paper FPL-RP USDA Forest Service, Forest Products Laboratory, Madison, Wisconsin. AIR DRYING LUMBER: First I will make a mention here that this is a very simple, easy way and only applies to drying lumber for the 1 man sawmill or homeowner sawmill, it will not include all the formula’s etc, just the basics for water or moisture content (MC) in lumber or logs is significant and can be % in the lumber or log.

      Approximately Douglas-fir and ponderosa pine logs, 3 to 6 inches in diameter, were tested in third-point bending and in compression parallel to the grain. The moisture content at time of test was about 14 percent. Good correlations were found between the modulus of elasticity (MOE) in static bending and those obtained by transverse vibration. Estimating air drying times of small-diameter ponderosa pine and Douglas-fir logs [microform] / William A guide to the seasoning of Australian timbers. Part 2 / by W.L. Greenhill, A.J. Thomas.

      Species included ponderosa pine (Pinus ponderosa), white wood (mix of western pines, fir, and spruce), Douglas-fir (Pseudotsuga menzeisii), western hemlock (Tsuga heterophylla), white spruce (Picea glauca), and red alder (Alnus rubra). Two drying schedules were used, one “conventional” and another with high temperature; and a target MC was Cited by: 4. Grading and properties of small-diameter Douglas-fir and ponderosa pine tapered logs The 12 monitor log sections for each species were cut from full-length logs. A 1-inch- (mm-) thick moisture section was cut from each end of each monitor section, and the .


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Estimating air drying times of samll-diameter ponderosa pine and Douglas-fir logs by William Turner Simpson Download PDF EPUB FB2

Estimate air drying times of ponderosa pine and Douglas-fir logs of any diameter between approximately 4 and 8 in. ( to mm), stacked at any time of the year, at any location where historical weather data are available. Background Attempts have been made to estimate air drying times for lumber.

Specifically, the goal was to develop an analytical method, based on experimental data, to estimate air- drying times of 4- to 8-inch- ( to mm-) diameter ponderosa pine and Douglas-fir logs stacked at any time of the year and at any location where histor- ical weather data are available.

Air drying is a logical alternative to kiln drying, but the variables involved make estimating air drying times difficult.

In this study, we developed experimental air drying time data for 4- to 8-in.- ( to mm-) diameter ponderosa pine and Douglas-fir debarked logs stacked at four different times.

Get this from a library. Estimating air drying times of small-diameter ponderosa pine and Douglas-fir logs. [William Turner Simpson; Xiping Wang; Forest Products Laboratory (U.S.)] -- Because dense stands of softwood trees are causing forest health problems in the western United States, new ways to use this material need to be found.

One option is to use this material as logs. In this study, experimental air-drying time data for 4- to 8-inch- ( to mm-) diameter ponderosa pine and Douglas-fir debarked logs stacked for air-drying at four different times of the.

() developed estimated drying times for small-diameter (4 to 8 in. ( to mm)) ponderosa pine and Douglas-fir logs using multiple regression methods. But that percentage often can exceed because it represents the ratio of the weight of the water in a piece of wood to the weight of the same wood when it is completely dry.

For example, a piece of green wood weighs 50 lbs.; dry, it weighs 20 lbs. That means that the green wood contained 30 lbs. Get this from a library. Estimating air drying times of small-diameter ponderosa pine and Douglas-fir logs.

[William Turner Simpson; Xiping Wang; Forest Products Laboratory (U.S.)]. Estimating air-drying times of small-diameter ponderosa pine and Douglas-fir logs. Wang, Xiping; Ross, Robert J.; Hunt, Michael O. Low Frequency Vibration approach to asess the Performance of wood structural Systems.

Pine Douglas fir Alder Hemlock Spruce (many types) Fruits (not a bug source but) Apple, Pear, and Prunus varieties (plum, cherry, stone fruits) I am storing my wood in a 15X25 carport and a portion of a 30X40 pole building both of which get sun and plenty of air circulation.

For the larch specimens, the length of cm was much greater than the width (10 cm) and thickness (5 cm), so a two-dimensional approach was used to simulate the heat and mass transfer.

The governing equation used for the conservation of energy was as follows (Cai and Oliveira ), (5) where T. It is located east of the Cheesman Reservoir (39°11′N and °16′W), and comprises low elevation (– m above sea level) montane forests, dominated by ponderosa pine (Pinus ponderosa Dougl.

ex Laws), with a secondary component of Douglas-fir (Pseudotsuga menziesii (Mirb.) Franco).Cited by: Instructions: Log Volume Calculator Diameter: All the major log rules use the small end diameter, inside the bark, as the basic size measurement.

If the log is not perfectly round, then two readings are taken at 90 degrees to each other and averaged. Length: The log length is the length to the last full foot (especially for hardwood logs). Estimating air drying times of small-diameter ponderosa pine and Douglas-fir logs.

Evaluation of factors affecting moisture estimates from a dielectric type moisture meter. 9th International IUFRO wood drying conference. Forintek Canada Corporation. The primary objective of this paper is to evaluate the appli­ cation of a proposed mechanical grading system for 9-inch diameter logs to smaller logs that are 3 to 7 inches in diameter.

A secondary objective is to compare test results for small di­ ameter logs to properties assigned by visual by: 7. I have about board feet (BF) of rough-sawn ponderosa pine timbers that are going to be used for an outdoor pergola.

and the results are fantastic. Drying time is reduced to three or four days, (for 8 x 8 douglas fir) and there is little to no defect or stain. The timeframe of the project won't allow four to six months of air-drying. Request PDF | An Investigation of Drying Technologies for Small Masson Pine Logs | Small-diameter Masson pine (Pinus massoniana) logs with a length of mm and a.

One procedure is for estimating air-drying times for 1-inch thick red oak, sugar maple, and ponderosa pine boards; the other is for 4-inch to 8-inch diameter Douglas-fir and ponderosa pine logs.

The procedure developed for boards can improve drying efficiency for companies air-drying lumber prior to kiln drying. mate the amount of time it takes for these timbers to air-dry. Since experimental data on estimating air-drying time for small-diameter logs have been developed, this study looked at a way to relate that method to square timbers.

Drying times were determined for a group of round cross-section ponderosa pine logs and a group of square timbers. Douglas-fir and ponderosa pine tapered logs David W. Green Thomas M. Gorman James W. Evans Joseph F.

Murphy Cherilyn A. Hatfield I Abstract Approximately Douglas-fir and ponderosa pine logs. 3 to 6 inches in diameter, were tested in third-point bending and in Compression parallel to the grain.

The moisture content at time of test was about. a problem in this type of ponderosa pine (Blake and VoorhiesSimpson and Green ). Table 1—Average cubic recovery percentage (cubic feet of lumber per cubic foot of log) for all logs from six trees each of Douglas-fi r and ponderosa pine Type Rough green Surfaced dry N Mean SD Mean SD Douglas-fi r: Empirical 25 62 50 How long does the powder post beetle larvae live in air dried wood that is about 3 inches thick, 2 feet.

wide and 4 feet long, the wood is sycamore. I will be air drying a disc of white ash recently cut. It is 3 feet in diameter and at least a foot thick. The objective of this study was to develop, compare and validate model prototypes for estimating the optimal storage time of fuelwood stacks stored outdoors based on average moisture changes.

Multivariate models for estimating moisture changes in different drying environments were created for this purpose. Experimental data were gathered during 7 to 14 months for most common Cited by: 4.