Increasing Sawntimber Recovery by Target Size Reduction
Sawing timber with excessive oversize, undersize or poor sawing accuracy can result in a decreased sawntimber recovery. As timber gets scarcer and more expensive, there is a need for sawmillers to improve sawntimber recovery to enable them to remain in business. Statistical Lumber Size Control (...
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| Format: | Project Paper Report |
| Language: | English English |
| Published: |
1990
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| Subjects: | |
| Online Access: | http://psasir.upm.edu.my/id/eprint/9866/ http://psasir.upm.edu.my/id/eprint/9866/1/FH_1990_7_A.pdf |
| Summary: | Sawing timber with excessive oversize, undersize or poor
sawing accuracy can result in a decreased sawntimber recovery. As
timber gets scarcer and more expensive, there is a need for
sawmillers to improve sawntimber recovery to enable them to
remain in business. Statistical Lumber Size Control (SLSC) has
wide recognition as a useful technique in increasing sawntimber
recovery. The objectives of this study are; to apply the
technique to monitor sawing accuracy and to appraise the economic
benefit of Target Size Reduction (TSR). The study was done in
three stages. Stage One involved the measurement of 100 boards
(25 subgroups of 4 boards per subgroup) to establish the green
target size and the existing recovery rate. In Stage Two, X-R
Control Charts were drawn and used to monitor the sawing
accuracy. The last stage assessed the net revenue improvement
based on the TSR. The result showed that a 2% increase in
recovery rate based on the nominal thickness of 7/8" (22.22mm)
can increase the estimated net revenue by $293,912.00 for the
first year of implementing a SLSC programme in a sawmill. The
technique and X-R Control Charts are effective tools in improving
the sawntimber recovery. However, in order to obtain a higher
recovery improvement, it is necessary to improve the dimensioning
device and the fence setting mechanism at the resaw machine. |
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