EFFECTS OF VARIETY AND MOISTURE CONTENT ON THE COEFFICIENT OF SLIDING FRICTION OF PALM KERNEL AND SHELL ON LEATHER TARPAULIN
Keywords:
textural pattern, kinetic friction, mixture separation, sliding frictionAbstract
One of the means of separating palm kernel and shell mixture is the coefficient of sliding friction which distinguishes the textural patterns of separating materials and its medium of separation. A thorough study of factors that can affect textural properties should be considered for an effective separation of palm kernel and shell. The effects of moisture content of two varieties of palm kernel and shell on the coefficient of sliding friction of two faces (front and back) of leather tarpaulin material was determined. The moisture content of both tenera and dura palm kernel and shell were determined according to the ASAE standards (1998) for oil seeds. The moisture content was adjusted to the desired value by adding a calculated volume of distilled water. The moisture content of dura and tenera varieties were 17.4 and 18.2% (w.b.) respectively, which were individually adjusted to 9.0, 13.0 and 17.0% (wet basis) by adding 76.3, 39.8 and 3.3 g; and 82.3, 46.4 and 10.6 g distilled water, respectively. The coefficient of sliding friction of sample variety was determined through an angle of repose apparatus. The coefficient of sliding friction for dura kernel and shell on the two faces (face A - front and face B - back) of the leather tarpaulin ranged from 0.41-0.49 for 9% moisture content; 0.44-0.51 for 13% moisture content; and 0.45-0.52 for 17% moisture content. The coefficient of sliding friction for tenera kernel and shell on the two faces of the leather tarpaulin ranged from 0.43-0.66 for 9% moisture content; 0.42-0.66 for 13% moisture content; and 0.42-0.73 for 17% moisture content. The moisture content of palm kernel and shell of either dura or tenera variety had no significant effect on the coefficient of sliding friction on any face of the leather tarpaulin except tenera shell, on face B of the leather tarpaulin.
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