Encyklopedie

About wood

On this page you will learn everything you are interested in about wood and its processing
  • VOLUME DENSITY OF TREES

    DENSITY, VOLUME DENSITY, FSP AND DRYING OF SELECTED TREES (AVERAGE DATA) AT 15% AND 0% HUMIDITY

    WOOD SPECIES

    DENSITY

    (kg/m3)

    VOLUME DENSITY (g/cm3)

    FSP w (%)

    DRYING

     

    r15

    r0

    R15

    R0

     

    LENGHT (%)

      RADIAL

    (%)

    TANGENC. (%)

    VOLUME (%)

    Acacia 770 730 0,65 0,73 0,1 4,4 6,9 11,4
    Pine 520 490 0,46 0,49 23-28 0,4 4 7,7 12,1
    Beech 720 680 0,62 0,68 32-35 0,3 5,8 11,8 19,9
    Oak 690 650 0,59 0,65 32-35 0,4 4 7,8 12,2
    Hornbeam 830 790 0,71 0,79 32-35 0,5 6,8 11,5 18,8
    Ash 690 650 0,59 0,65 0,2 5 8 13,2
    Maple 630 590 0,55 0,59 0,5 3 8 11,5
    Fir tree 450 410 0,39 0,41 30-34 0,1 3,8 7,6 11,5
    Elm 680 640 0,59 0,64 0,3 4,6 8,3 13,2
    Linden 530 490 0,45 0,49 32-35 0,3 3,5 6,3 10,1
    Larch 590 550 0,51 0,55 23-28 0,3 3,3 7,8 11,4
    Alder 530 490 0,45 0,49 0,5 4,4 7,3 12,6
    Walnut 680 640 0,59 0,64 0,5 5,4 7,5 13,4
    Aspen 450 420 0,4 0,42 32-35 0,3 3,5 8,5 12,8
    Platan 630 580 0,54 0,58 0,5 4,5 8,7 13,7
    Spruce 470 430 0,4 0,43 30-34 0,3 3,6 7,8 11,9
    Poplar 450 410 0,39 0,41 32-35 0,3 5,2 8,3 13,8
    Avodiré 550 510 0,48 0,51 34-36 3,5 6,5 9,6
    Beta 600 560 0,52 0,56 23 1,2 3
    Dibetou 550 510 0,48 0,51 23 3,5 5,9 7,3
    Ebony 1020 1000 0,9 1 30-33 15
    Framiré 550 510 0,48 0,51 30 2,9 4,5 8,5
    Hikora 810 770 0,7 0,77 0,6 7,8 11 18,4
    Iroko 680 640 0,59 0,64 20-23 3,8 5,6 10,5
    Kosipo 670 630 0,58 0,63 30-35 4,5 6 11,3
    Limba 580 540 0,5 0,54 32-36 0,3 3,5 6,3 10,1
    Mahogany am. 590 550 0,51 0,55 21 0,3 3,2 5,1 8,6
    Mahogany af. 520 480 0,45 0,48 26-30 4,1 5,8 11,2
    Hakoré 670 630 0,58 0,63 31 6,2 8,2 14,3
    Both samba 390 350 0,33 0,35 28 3,1 5,3 9,5
    Okoumé Gaboon 460 420 0,4 0,42 25-29 0,2 4,1 6,6 10,9
    Rosewood 880 850 0,75 0,85 18-24 8,8
    Sapelli 710 670 0,61 0,67 30-33 5,2 6,8 13,5
    Sipo 660 620 0,57 0,62 26-30 5,9 6,9 12,8
    Teak 670 630 0,58 0,63 26-31 3,7 6 9,5
    Tiama 550 510 0,48 0,51 36 5 7 13,4
    Gedu, nohor, Tola 550 510 0,48 0,51 32 8,1

    FSP – fiber saturation point (%)

    R0 – density of dry wood

    1.54 – specific weight of wood substance (g / cm3)

  • Wood - About Wood

    Wood means matter of organic origin, which is created by natural processes with the interaction of air and soil in the trunk, branches and roots of woody plants. Wood is found in the trunks, branches and roots of woody plants between pulp and cambium.
    Each tree has three main parts: the crown (a set of branches with leaves), the trunk and the roots.

  • Typical features for individual tree species

    Spruce: Spruce wood is creamy white to brownish, with distinct annual rings. On all three sections (transverse, longitudinal, tangent) we can easily notice a clear color difference between the spring and summer incremental layers of wood.

    Fir: The color of the wood, from creamy white to light yellow-brown, closely resembles spruce, but fir wood is a little less shiny.
    Pine: the white part is creamy white to ocher, the core orange-brown to rust. The annual rings are pronounced.

    Larch: The white layer is light yellow-brown, the core ocher to reddish-brown. The texture (drawing of annual rings) is thicker than spruce and excels in the beauty of many small, mostly well-overgrown knots.

    Douglas fir: White wood is slightly lighter than heartwood, which has a light reddish brown color. The longitudinal section shows a distinctive drawing of annual rings.

    Yew: The color of the heartwood varies from orange-brown with dark annealing to purple-brown with darker mallow or brown spots and spots of growing bark.

    Oak: It has a relatively narrow, light brown white and a wide, evenly brown core. Distinctive “mirrors” (cut marrow rays) appear on the central and tangential section. Thanks to them, oak can be safely distinguished from elm or ash.

    Elm: Core wood is usually distinctly chocolate brown, often with a reddish tinge, and is markedly different from lighter whitish wood. Core wood has narrower and irregular annual rings.

    Ash: White, broad in young trees, narrower in old ones, creamy white, whiter in some individuals than maple, other pinkish. The core is usually irregularly demarcated, dark brown. Distinctive annual rings.

    Acacia: From a narrow brownish-white white to a marrow there is a yellow-green-brown color, with a different, often interesting drawing. The annual rings are clearly visible.

    Beech: Beech wood is very light cream to pinkish brown and often acquires a reddish bronze-brown color after steaming. It is straight-fiber, with wide marrow rays, and has a fine, regular texture.

    Hornbeam: There is no difference between white and heartwood – both are indistinct white with gray stripes and spots, caused by wide marrow rays that form a speckled pattern when cut into quarters. It is usually irregularly or transversely fluted and has a fine, symmetrical texture.

    Alder: There are only slight differences in color between white and heartwood, in general the alder wood is indistinct, without gloss, freshly cut it has a bright orange-brown color, which ripens to light reddish brown, with dark stripes in places of wide rays . The wood is straight-fiber, except for the places around the knots, and with a fine texture.

    Maple: White wood is practically indistinguishable from the core; both are creamy white and have a narrow, straight pattern and indistinguishable annual rings. The texture is smooth, soft.

    Birch: There is no color difference between white and heartwood, both have an inconspicuous creamy white to light brown color. The wood has a fine sagging and a fine texture. Marrow spots can be observed in the wood, which form irregular dark spots.

    Linden: Creamy to yellow or gray-white colored, relatively firm, soft wood is uniformly dense.

    Poplar: Core wood is not clearly separated from white wood, it is creamy white to very light straw in color, in some species light brown or pink-brown. It is usually straight-fiber and somewhat rougher (felt surface of the wood), but has a fine, regular texture.

    Walnut: The heartwood is usually gray-brown, with irregular dark brown to black veins, accentuated by the naturally wavy course of the fibers. This wood with a distinctive pattern forms the core significantly different from other wood.

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  • Tree names

    Czech Botanical name

    Abbreviation

    Latin name

    English name

     

    German name

     

    Trnovník akát (akát bílý)

    AK

    Robinia pseudoacacia L.

    false acacia, black locust

    Robinie

    Borovice lesní

    BO

    Pinus sylvestris L.

    Pine

    Kiefer, Föhre

    Borovice černá

    BOC

    Pinus nigra ARNOLD

    Austrian pine, European black pine

    Schwarzkiefer

    Bříza bílá (syn. b. bělokorá nebo b. bradavičnatá)

    BR

    Betula alba L.

    Birch

    Birke

    Buk lesní

    BK

    Fagus sylvatica L.

    Beech

    Buche

    Douglaska tisolistá

    DG

    Pseudotsuga menziesii (Mirbel) Franco

    Douglas fir

    Douglasie

    Dub letní, Dub zimní

    DB

    Quercus robur L., Q. petraea Liebl.

    Oak

    Eiche

    Habr obecný

    HB

    Carpinus betulus L.

    Hornbeam

    Hainbuche

    Jalovec obecný (případně j. viržínský aj.čínský)

    JAL

    Juniperus communis L. (případně J. virginiana J. chinensis)

    Juniper

    Wacholder

    Jasan ztepilý

    JS

    Fraxinus excelsior L.

    Ash

    Eshe

    Javor klen, Javor mléč

    KL, JV

    Acer pseudoplatanus L., A. platanoides L.

    Maple

    Ahorn

    Jedle bělokorá

    JD

    Abies alba Mill.

    Fir

    Tanne

    Jilm horský, Jilm vaz, Jilm habrolistý

    JL

    Ulmus montana Stok., U. laevis Pall., U. carpinifolia Gled.

    Elm

    Ulme

    Lípa srdčitá, Lípa velkolistá

    LP

    Tilia cordata Mill., T. platyphylla Scop.

    Basswood, lime

    Linde

    Modřín opadavý

    MD

    Larix decidua Mill.

    Larch

    Lärche

    Olše lepkavá, Olše šedá

    OL, OLS

    Alnus glutinosa Gaertn., A. incana Moench.

    Alder

    Erle

    Ořešák královský

    OR

    Juglans regia L.

    Common walnut

    Walnussbaum

    Smrk ztepilý

    SM

    Picea abies (L.) Karsten

     

    Spruce

    Fichte

    Švestka domácí

    Prunus domestica L.

    Plum

    Pflaume

    Tis červený

    TS

    Taxus baccata L.

    Yew

    Eibe

    Topol černý, topol bílý, topol osika

    TPC, TP, OS

    Populus nigra L., P. alba L., P. tremula L.

    Poplar

    Pappel

    Třešeň ptačí

    TR

    Cerasus avium (L.) Moench.

    Cherry tree

    Kirschbaum

    Borovice vejmutovka

    VJ

    Pinus strobus L.

    Eastern white pine, Weymouth pine

    Weymouthskiefer, Strobe

    Vrba bílá, vrba křehká

    VR

    Salix alba L., S. fragilis L.

    Willow

    Weide

    (3) Source: ZEIDLER, A., LEXIKON DŘEVA, ČESKÁ ZEMĚDĚLSKÁ UNIVERZITA V PRAZE, FAKULTA LESNICKÁ A DŘEVAŘSKÁ, 2012

  • IN WHICH AGE ARE TREES CHOPPED DOWN

    TYPE AGE IN YEARS
    Locust tree 20-60
    Poplar black 30
    Birch tree, Poplar white, Alder tree 40
    Maple, Cedar, Cherry tree, Sycamore maple 50
    Larch, Ebony, Elm, Pine 70-80
    Fir tree, Ash tree, Walnut tree 100
    Beech 100
    Chestnut, Cypress tree, Oak 80-250

     

    WOODHARDNESS

     

    Very hard Ebony, Box tree, Hawthorn, Hornbeam
    Hard Cherry tree, Maple, Oak, Yew tree
    Medium hard
    Beech, Walnut tree, Chestnut, Pear tree, plane tree, locust tree, Mahogany, Cedar tree, Ash tree, Teak
    Soft
    Fir tree, Birch tree, Alder tree, Pine, Spruce
    Very soft Poplar tree, Willow tree, Balsa
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