Abstract
Grading according to the sizes is an important value adding technique for Robusta green coffee bean. Mechanical grading can increase the sorting efficiency and the need for workers is decreased. Therefore, the sorting efficiency of size grading machine was optimized based on inclined angle and oscillating speed. The Response Surface Methodology (RSM) combined with central composite design (CCD) was applied in the optimization of the sorting efficiency of the machine. A quadratic model was suggested for the sorting efficiency of size grading machine. The results showed that the optimum operating parameters for size grading machine using oscillating sieve with swing along width direction were inclined angle of 5.06 degree and oscillating speed of 183.28 rpm with a sorting efficiency of 79.99%. The high correlation coefficient (R2 = 0.9676) indicated that the data predicted using RSM were in good agreement with the experimental results.
Highlights
Size grading is one of the important operations in the production of green coffee bean because the size directly affected the time and temperature in the roasting process [1]
The size of green coffee bean in Thailand can be divided into four groups based on diameter of the individual coffee bean according to the standard of Ministry of Agriculture and Cooperatives, Thailand [3] such as very large, large, medium and small
The objective of this work was to investigate the optimization of size grading factors using Response Surface Methodology (RSM) for sorting efficiency of size grading machine using oscillating sieve with swing along width direction
Summary
Size grading is one of the important operations in the production of green coffee bean because the size directly affected the time and temperature in the roasting process [1]. It affects the qualities (taste and odor) and value of green coffee bean [2]. The size of green coffee bean in Thailand can be divided into four groups based on diameter of the individual coffee bean according to the standard of Ministry of Agriculture and Cooperatives, Thailand [3] such as very large, large, medium and small. Theirs diameters were as follows: the diameter of very large size must be not less than 7.1 mm; the diameter of large size must be not less than 6.3 mm and not more than 7.0 mm; the diameter of medium size must be not less than 5.6 mm and not more than 6.2 mm and the diameter of small size must be not more than 5.5 mm.
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