forestry-final-6
Terms
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copy deck
- 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