Seasoning and machining degrade in young-growth Douglas-fir dimension lumber

Seasoning and machining degrade in young-growth Douglas-fir dimension lumber by B. G. Anderson Download PDF EPUB FB2

The increasing volume of young-growth Douglas-fir timber cut in the Pacific Northwest emphasizes the need for more knowledge on the character-istics of lumber sawed from these trees. The study described here was initiated to learn the extent and causes of degrade resulting from kiln-drying young-growth Douglas-fir dimension lumber.

Conference Proceedings Or Journal Seasoning and machining degrade in young-growth Douglas-Fir dimension lumber Public Deposited.

Analytics × Add to Author: B. Anderson, A. Knauss, R. Frashour. 10diameter at breast height [DBH]) Douglas-fir trees did not produce lumber having poor flexural properties. Instead, the 2 by 4 lumber from these to year-old trees graded as 68 percent Select Structural for light framing, and 89 percent passed as stud.

Full text of "Seasoning of Wood: A Treatise on the Natural and Artificial Processes Employed in the. Full text of "Report of the National Conference on Utilization of Forest Products" See other formats. It is moderately low in shrinkage.

Reference (56). Mature growth timbers may contain brown stain, possibly as a result of wetwood, and young growth may contain warp, possibly as a result of juvenile wood or compression wood (). bCare should be taken, if air seasoning, to avoid blue staining of the sapwood. Reference ().

Seasoning: The timber dries fairly rapidly with little degrade, and small movement in service, Working properties: There is a moderate blunting effect on tools, but can be worked satisfactorily. Fpl gtr secagem 1.

United States Department of Agriculture Forest Service Forest Products Laboratory General Technical Report FPL–GTR– Air Drying of Lumber Fagus grandifolia 55 72 — Cedar, western red Thuja plicata 58 62 Birch, paper Betula papyrifera 89 72 — Douglas-fir, coast type b Pseudotsuga menziesii 37 45 Birch.

The objective of the study was to reveal the effect of RF heating at different power densities and time combinations as pre-conventional kiln treatment on the drying characteristics and quality of sub-alpine fir lumber. As a consequence of this objective, the study hypothesis was formulated as: “if RF heating improves the permeability of sub-alpine fir, then upon kiln drying, final moisture.

This study was aimed at exploring the effect of oscillating the drying temperatures of a drying schedule on the drying characteristics of thick western hemlock timbers.

Pacific coast hemlock which is comprised of about 70% western hemlock (Tsuga heterophylla (Raf.) Sarg.) is one of the best quality and most abundant softwood species along the coast of British Columbia.

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Hewn timber: Timber shaped by axe or adze roughly to a given size. (In North America the word "lumber" corresponds to the word "timber" as used in Australia. In the former countries, "timber" is defined as sawn material whose least dimension is 5 in.).

Superficial Feet The unit of measurement of timber as used in Australia is the superficial foot. How to Copy and Paste from Microsoft Word to Email - Oak Lawn pdf Кб. Title from cover. bFORINTEK - Free download as PDF File .pdf), Text File .txt) or read online for free.

Lateral-Torsional Buckling Instability Caused by Individuals Walking on Wood Composite I-Joists. NASA Astrophysics Data System (ADS) Villasenor Aguilar, Jose Maria.

Recent researc. Douglas-fir lumber is used in the manufacture of sashes, doors, laminated beams, general millwork, railroad-car construction, boxes, pallets, and crates. Small amounts are used for flooring. WORLD WOODS IN COLOUR contains information on over commercial woods from worldwide sources.

The full-colour illustrations show the timber's natural grain and features and each is fully annotated with relevant information including commercial and botanical names, distribution, general description, mechanical properties, seasoning, working properties, durability and a full range of uses.

In the United States, hardwood lumber is graded according to three basic marketing categories: factory lumber, dimension parts, and finished market products.

Factory lumber grades differ from dimension and finished market products in that the former are based on the proportion of the lumber that can be cut into smaller usable pieces. Wood Handbook Wood as an Engineering Material Forest Products Laboratory USDA Forest Service Madison, Wisconsin Contents Preface v 5 Commercial Lumber Hardwood Lumber 5–1 Softwood Lumber 5–7 Purchase of Lumber 5–12 Commonly Used Lumber Abbreviations 5–18 References 5–20 6.

Free essays, homework help, flashcards, research papers, book reports, term papers, history, science, politics.AWI_Ed2_wChanges_pdf - Free ebook download as PDF File .pdf), Text File .txt) or read book online for free. Scribd is the world's largest social reading and publishing site.

Search Search.The air drying of lumber involves exposing piles of stickered lumber to the outdoor air. The dry-bulb temperature of the air, its relative humidity as indicated by the wet-bulb depression, and the rate of air circulation are important factors in successful air drying.