2 edition of Alternative methods for sawing and drying structural lumber from second-growth loblolly pine (pinus taeda) found in the catalog.
Alternative methods for sawing and drying structural lumber from second-growth loblolly pine (pinus taeda)
Robert R Maeglin
|Statement||by Robert R. Maeglin and William T. Simpson|
|Contributions||Simpson, William Turner, 1938-, Forest Products Laboratory (U.S.)|
|The Physical Object|
|Pagination|| p. :|
|Number of Pages||12|
The s PhiPT values were low as expected for naturally outcrossing species, in loblolly pine and in shortleaf pine, suggesting most diversity occurs within seed sources, but for current day samples PhiPT was more than twice a high, in loblolly pine and in shortleaf pine, suggesting increasing diversity among seed sources. Structural features of the sawmill included a circular log-cutoff saw, ring debarker, headrig, resaws, two lumber edgers, lumber trimsaw, automatic lumber sorter, and chippers. (See Wagner et al. for a more detailed description of the mill.).
FIG. 5 shows in partial perspective a lumber product produced by the method. FIGS. show in cross section alternative layups of the lumber products. FIG. 9 is a partial perspective end view, with considerable vertical exaggeration, of an experimental panel for producing an edge densified lumber product and a comparison control sample. The ultimate bending strength of green, clear wood specimens of coast Douglas- fir and loblolly pine are reached at an average stress of and kPa, respectively” [Ritter, ]. Figure Bending in wood members produces tension and compression in the extreme fibers, horizontal shear, and vertical deflection.
This veneer obtained by this method has the desired cathedral wood grain pattern, and is used to cut, for example, the species white oak, red oak, black walnut, and black cherry in the USA. In another method, a quarter section of the log is placed on a lathe-type machine, producing veneer sheets expressing the tangential face of the log. New and improved products - composites 12 1. Flakeboard, particleboard, and fiberboard 12 2. Laminated beams and columns 13 3. Laminated lumber 13 4. Molded products 14 5. Composites of wood in combination with concrete, steel, or fiberglass 14 D. New and improved products - components 15 1. Fastening methods 15 2.
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ALTERNATIVE METHODS FOR SAWING AND DRYING STRUCTURAL LUMBER FROM SECOND-GROWTH LOBLOLLY PINE (PINUS TAEDA) By Robert R. Maeglin and William T. Simpson SUMMARY The processing of second-growth pine is a major problem. The combination of juvenile wood, compression wood and growth stresses makes the manufacture of straight lumber difficult.
Get this from a library. Alternative methods for sawing and drying structural lumber from second-growth loblolly pine (Pinus taeda). [Robert R Maeglin; William Turner Simpson; Forest Products Laboratory (U.S.)]. Abstract Lumber was sawn from suppressed-growth ponderosa pine trees, 6 to 16 inches in diameter, harvested near Flagstaff, Arizona.
This paper presents grade recover and properties for dry 2 by 4's sawn from the logs and graded by a variety of structural grading systems. ALTERNATIVE METHODS FOR SAWING AND DRYING STRUCTURAL LUMBER FROM SECOND-GROWTH LOBLOLLY PINE (PINUS TAEDA) is possible to minimize the warping of second-growth loblolly pine (Pinus taeda.
PDF | The effect of moisture content on some physical properties of mucuna bean seed as a prerequisite for the design of processing machines was | Find, read and cite all the research you need.
Field methods for rapid determination of wood density in trees have evolved from increment borer, torsiometer, Pilodyn, and nail withdrawal into sophisticated electronic tools of resistance drilling measurement.
A partial resistance drilling approach coupled with knowledge of internal tree density distribution may offer an alternative solution for wood density surveys in the future. The template for the following discussion of methods is illustrated in Fig.
1 which is a modification of the conceptual model proposed by Switzer and Nelson ().All forests fit within the conceptual model in Fig. 1; however, in analysis and interpretation the type of forest needs to be of the earlier work on nutrient cycling was undertaken on Northern Hemisphere.
U.S. Forest Service American Woods series: Alder, red Oaks Baldcypress Osage -orange Black cherry Pine, eastern white Buckeye jack Butternut ponde ros; 1 Cedar, Alaska red Cedar, eastern red- southe rn incense - sugar northern white- western white Port Orford white Redwood Douglas -fir Spruce, Sitka Fir, noble Sweetgum white T amarack Hackberry.
Types of Wood to Use for Cordwood. Rob Roy is Director of the Earthwood Building School, which has specialized in cordwood masonry instruction since Rob and his wife, Jaki, have built four innovative cordwood homes for themselves sinceincluding the Earthwood home where they have lived for over three decades.
Dry Seasoned, usually to a moisture content of 19% or less. Dry Rot A type of decay in seasoned wood, caused by fungi. Eastern S-P-F Lumber of the S-P-F group produced in the eastern provinces of Canada (i.e., Manitoba and Saskatchewan) and in the northeastern United States.
Abstract. During the 20 th century, the Pacific Northwest (western Oregon and Washington, coastal British Columbia, and southeastern Alaska) produced some of the highest quality timber in North America. Forests were old and trees were large; wood products from this region were easily distinguished from those made from timber produced in other regions in North America.
This paper provides a review on the use of acoustics to measure stiffness of standing trees, stems, and logs. An outline is given of the properties of wood and how these are related to stiffness and acoustic velocity throughout the tree.
Factors are described that influence the speed of sound in wood, including the different types of acoustic waves which propagate in tree stems and lumber. When a conifer shoot is displaced from its vertical position, compression wood (CW) is formed on the under side and can eventually return the shoot to its original position.
Changes in cell wall structure and chemistry associated with CW are likely to result from differential gene/protein expression. Two-dimensional polyacrylamide gel electrophoresis of differentiating xylem proteins was.
Lumber and Plywood at WOODWEB's Knowledge Base. Find articles on what old growth means, processing trees to lumber, sawing utility poles, chip-free dovetailing in plywood, flattening boards with a planer, the sustainable chain of custody, converting board foot to lineal foot pricing, and much more.
Modern Technology Of Pulp, Paper And Paper Conversion Industries by Niir Board Of Consultants And Engineers, ISBN: X, Rs.
/ US$. The Victorian Good Wood Centre suggests using native Hoop Pine as a quality substitute for the non-native Slash Pine. SOUTHERN BLUE GUM (H) Southern Blue Gum (Eucalyptus globulus), is a large hardwood found natually occurring in the cooler districts of.
Wood is a porous and fibrous structural tissue found in the stems and roots of trees and other woody is an organic material – a natural composite of cellulose fibers that are strong in tension and embedded in a matrix of lignin that resists compression.
Wood is sometimes defined as only the secondary xylem in the stems of trees, or it is defined more broadly to include the same. A craftsman's question about screen door materials kicks off a long discussion about the qualities of various wood species, old growth and second growth.
October 4, Warp in Drying Causes and cures for warpage when drying lumber. May 4, Troubleshooting Cupping in a Bar Top A solid Ipe bar top starts to show cupping.
This study examined drying rates for loblolly pine harvested at different seasons. Most of the drying occurred in the first month after felling. Moisture content was reduced between one-third and one-half of initial moisture content.
This amount of drying almost doubles the energy value of the woody biomass with little to no additional costs. From Figure 6 and according to Adewopo et al.9 () under dry conditions a heat treatment of °C for 8 hours can be safely applied to pine, sweetgum, and oak without posing a significant negative impact on their essential mechanical properties.
FIGS. 18 and 19 show an alternative method of preparing the slats by sawing rather than slicing. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS. The typical logs used in the method of the present invention will be from about cm ( inches) at their smaller end and be about m ( feet) long.Southern yellow is a term used to describe several hard pine species (shortleaf, slash, and loblolly) sharing similar characteristics.
The wood from these species is relatively heavy, hard, strong, stiff, and shock resistant. Southern yellow pines shrink quite a bit while drying, but the wood is quite stable once it has been seasoned.MacFall, J. S., Johnson, G.
A. & Kramer, P. J. Observation of a water-depletion region surrounding loblolly pine roots by magnetic resonance imaging.
Proceedings of the National Academy of Sciences of the United States of Amer (). McCully, M. E. Roots in Soil: Unearthing the complexities of roots and their rhizospheres.