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Conversion of sawn timber to finished size
If you want to make a few frames and doors
for new homes, how many cubic timbers you need to buy? Or when it will
produce a few dining chairs, how many cubic of sawn timber to be provided?
Similarly, the log conversion to sawn timber, not 100% wood that we buy can
be processed into products.
Waste wood will always be in a production process, but how we treat the wood
with the wise so that waste can be minimized is a special achievement,
especially in the context of production efficiency. Globally the cost of
production for the main material of wood for 60-75% of the total cost,
therefore, to conserve the use of wood raw material is good will give us
significant advantages.
We see the following illustration in the image:
The first block (1 m long) at the time before shaved measuring is 35 x 65mm
(0.002275 m3 volume). Get a smooth surface reaping will take + / - 2-3 mm
thickness on each side of the shave. Also with the wide side. So after is
shaved size 29 x 59 mm, the volume of timber to be 0.001711 m3. The cubic
has been converted after shrinking by 25%, meaning that initial volume
decreases and the remaining 75%. This conversion is only on the wide and
thick.
Let us look at the long side. On the block with a 1 meter long, to cut with
a smooth and orderly will need at least 20 mm in length on each side, and
even then if there are no defects or cracks knots / broken. We consider one
long side of good quality so that all cut only 20 mm, and the other side is
cracked up, so to be cut along the 50 mm. After cutting 20 + 50 mm at each
end, remain block is 930 mm. To that the end volume used is 0.001711 x 93% =
0.001591 m3. The final results of conversion is 0.001591/0.002275 m3 = 57%.
From 100% of the initial timber volume, 43% of them have become sawdust,
dust and pieces that can not be used.
Even more interesting to know this is when we convert the log to a finish
size. In the previous article about the conversion of logs to sawn timber is
about 58%, and conversion of timber to be finish size is 57% (remember,
these conversions will be variety depending on the type of wood, log size,
processing method and the desired end result.
1 m3 of logs -> 0:58 m3 of sawn timber
1 m3 of sawn timber -> 0:57 m3 finish size, so that:
1 m3 of logs -> 0:58 m3 of sawn timber -> (0:58 x 0:57) = 0:33 m3.
In practice the actual workmanship. Conversion log to the finished size is
between 20% - 35%. Very difficult to get a yield above 35%. Here are some
examples and the yield of several types of wood:
Teak grade 1 (no eyes, no white): 20-27%
Teak grade 2 (no eyes, no white): 25-29%
Acacia (no white): 23-28%
Keruing: 30-35%.
Author : Draker_Ster is the owner of the website which
specialists in offering indoor and outdoor furniture.
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