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21 Cards in this Set

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excelsoir
-used for packing
-can process into paper, but very expensive
hydroscopic
=can take/give off water
lignon
=glues the cells of the wood together, but is not as strong as the cell itself
glue problems
-smell
-toxic gases (allergies)
basic wood elements from largest to smallest
logs-lumber-thin lumber/thin veneer-veneer-long flakes/short veneer-chips-flakes-excelsior-strands-particles-fiber bundles-paper fiber-wood flour-cellulose-lignin
OSB=oriented strand fiberboard
=uses all material but bark
-90% of wood used
long flakes
=better way to use wood, gluing the flakes together
strands
-long tubes glued together
-strength b/c vertical
log
-was first building block
-uses:firewood, log houses, produce charcoal
uses of bark
-landscaping, mulching, burned as a fuel source
results of OSB
-increased utilization
-demand increased
-lower supply
bark
-always removed from a de-barker
-not used for pulp or paper
veneer
=2 ways to produce:
a. slice with razor blade from wood
b. start with desired piece and slice
TMP
=thermal mechanical pulp
-uses 90% of wood volume
particles
-turned into paper
lumber
-recover 33-40% of volume of wood:
11% bark
26% trim and edges
10% planer shavings
13% sawdust aka kerf
OSB vs. plywood
-plywood has less glue
-OSB water reacts with glue
-OSB less expensive
how much of wood is lost by burning
60%
why use wood
a. low heat capacity
b. manipulative
c. beauty
d. inexpensive
e. high weight to strength capacity
f. resistant to vibration
g. relects sound when dense
h.low expansion to heating
i. resistant to acids
j. converts sound energy into heat energy
k. is hydroscopic
thin lumber
=makes more air
wane
=bark on the edges of board