understanding the three surfaces of wood
DESCRIPTION
3 wood cutting surfacesTRANSCRIPT
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The sapwood is not well defined from the
heartwood, which is white turning to yellow on
exposure.
Texture is moderately coarse and even.
Vessels lines present.
Grain is generally straight.
The timber is light and soft with an air-dry
density of 290 to 465 kg m~'.
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Growth rings :
moderately distinct, marked by layers of thicker
fibre.
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Vessels :
medium sized to large, solitary and in radial multiples
of 2 to 4, sometimes in clusters,
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tyloses :absent,
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Wood parenchyma :
present but difficult to detect with the naked eye
and just visible by using the lens due to the lack
of contrast between the fibres and the
parenchyma.
Have 2 types:
Apotracheal parenchyma as diffuse and diffuse
in aggregates, forming short uniseriate lines.
Paratracheal parenchyma sparse and confine
only to the immediate vicinity of the vessels.
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diffuse
reticulate
banded
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confluentaliform
vesicentric
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Rays :of two distinct sizes, the broader rays can
be- observed easily with a handlens.
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Ripple marks :brick like structure appear to the cross
cutting
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intercellular canals :not observed.
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Uses
A light-coloured and light-weight timber. The timber is suitable
for use as picture frame,moulding, skiring, wooden sandals,
disposable chopstick, general utility furniture, veneer
and plywood.
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HARDWOOD
Ray in boat shaped
Vessel
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HARDWOOD
Ray in cube shaped
Vessels
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HARDWOOD
Pore
Gum duct
Intercellular canals
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CROSS SECTION
See growth ring boundaries,and interiors of
cells,end view of log.
TANGENTIAL SECTION
Cut longitudinally,more or less down parallel to
growth rings,at right angles to rays.
RADIAL SECTION
Cut longitudinally,more or less down at right angles
to growth rings,and parallel to rays