Abstract
This study was conducted at Elfaid Um Abdalla saw-mill in Southern Kordofan State to improve Mahogany timber quality by improving air drying process. 6.25 cm thickness lumber boards of 210 cm length were prepared and stacked using three thicknesses of stickers (2.5, 3.75, 5 cm) and replicated three times for each sticker under shade and under direct sun light. This was done to determine the effect of stickers and shading on drying rate and magnitude of defects that occurred during the drying process. Moisture loss was recorded every two days by weighting sample boards inserted in the center side of each stack. Data analysis was done using JMP statistical package. The study showed that there was no effect of the three kinds of stickers and shading on moisture loss during the drying process, while there was effect of shading and stickers on number of defects that are caused with the drying process. The study recommends using 2.5 cm sticker thickness and shading to decrease defects that are caused by drying.
Highlights
The development of technology of wood, which has been going on for the past eight decades or so, was dictated by the rising competition of metals and other alternative material
The study showed that the initial moisture content (IMC) and Equilibrium moisture content (EMC) of Khaya senegalensis timber when it was dried under shade were not significantly different from IMC and EMC of timber dried under sun
The results showed that shading had no significant effect on wood moisture loss (Table 2); there was no significant difference between moisture loss under the shade and under the direct sun
Summary
The development of technology of wood, which has been going on for the past eight decades or so, was dictated by the rising competition of metals and other alternative material. The total consumption of sawn timber in the Sudan is about 150.000 m3 per annum; 21% of this goes into building construction and 24% for joinery; 80% of the total consumption is imported soft wood, this is in spite of the fact that our existing forests can supply all our requirements from this commodity. This is partly due to prejudice from the users part against using local woods, and prejudice was attributed to the lack of information about properties and specifications relating to local wood, with good design following the appropriate specifications. This investigation is an attempt to improve on less costly drying methods without increasing the liability to drying defects
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