Browsing by Author "Agyei-Boakye, Isaac"

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    Effect of log size and felling defects on rotary veneer of four Ghanaian timber species
    (1994) Agyei-Boakye, Isaac
    The effect of log diameter and felling defects on rotary veneer recovery for four species namely, Ptervgota macrocarpa (Koto), Ceiba pentandra (Onyina), Daniella ogea (Hyedua) and Khaya ivorensis (Mahogany) was studied in three mills located in Kumasi. Felling defects comprising shakes and splits of various forms were categorized and expressed as a percentage of diameter or log length depending on the location and direction of defect. The veneer recovery volume was expressed as a percentage of the original log volume. Residues in the form of log trimming during bolt manufacturing (i.e barking logs into bolts that can be peeled into useful veneer), peeler core, rounding offs, and wet veneer clipping losses were also expressed as a percentage of the original log volume. A very weak correlation was observed between log diameter and veneer recovery. Similar observation was made between felling defects and veneer recovery. Scatter diagrams did not follow the normal polynomial or exponential function. Weak linear and quadratic relationships were noted. Quadratic regression did not differ much from the simple linear or multiple regression equations. The speculation that these secondary species have size related felling defects which reduce veneer recovery could not be proved.