By Franz F.P. Kollmann, Wilfred A.Jr. Cote, Franz Kollmann
Modern wooded area items study had its commence hardly ever fifty years in the past. this day we're capable of follow the name "wood technology" to the sector of wooden expertise that's in keeping with clinical research, theoretical in addition to experimental. it truly is this examine that fosters new makes use of for wooden as a uncooked fabric and that creates the basis for brand new industries for the manufacture of wood-base fabrics akin to plywood, laminated items, particle and fiber board and sand wich building. wooden know-how in its broadest experience combines the disciplines of wooden anatomy, biology, chemistry, physics and mechanical expertise. it's via this interdisciplinary process that growth has been made in wooden seasoning, wooden renovation equipment, wooden machining, surfacing and gluing, and within the many different strategies utilized in its usage. In 1936 the senior writer released a ebook entitled, "Technologie des Holzes", which was once a primary method of a common reference ebook on wooden expertise. the 1st variation of quantity I of the Textbook of wooden know-how, co-authored via H. P. BROWN, A. J. P AN SHIN , and C. C. FORSAITH, used to be released in 1948. a sign of the swift improvement of this box might be won from the truth that the second one variation of "Technologie des Holzes und der Holzwerkstoffe", thoroughly revised, used to be wanted via 1951. It comprises 2233 pages in comparison with the 764 pages of the 1936 edition.
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Extra resources for Principles of Wood Science and Technology: I Solid Wood
Example text
26). The 8 1 is invariably a thin layer, consisting of but a few lamellae, with the microfibrils wound helically around the main axis of the cell. 35 fLm (micrometer = micron) in thickness. Others have reported similar values for coniferous species. Although the main body of 8 2 exhibits an orientation nearly parallel to the long axis of the cell, there are transition lamellae on its inner and outer faces. The several lamellae in these regions show a gradual shift from 8 1 to main 8 2 alignment and from main 8 2 to 8 a orientation (Fig.
43b). This condition is especially true of conifers. The bordered side of the pit pair is variable in structure but in a pattern consistent enough to be of diagnostic value. , have a large window-like or fenestriform pit on the tracheid side of Fig. 42. Simple pit pairs between parenchyma cells of Fagus granditolia Ehrh. heartwood. Note the fine channels across the the crossfield. The hard pines pit membrane, caused by plasmodesmata. Polyphenolic substances can be seeu in the pit canals. (11,700 x).
25. Polarized light photomicrograph of normal wood cross section of Larix occidentali" Nut,t. Note the bright lines at the inner and outer layers of the cell wall, and the dark middle layer. S •• between them. At the left side of micrograph is a ray. (610 x ) Fig. 26. ) Franco, with S, layer at right, and S, at left. Note the relative orientation of the two layers. 200 x) 24 1. The Structure of Wood and the Wood Cell Wall [Ref. p. 52 The Sa, when present, is a thin layer of helically arranged microfibrils like the S1' probably not exceeding five or six lamellae in thickness.