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Articles

CJET: VOL. 6 NO. 1, June 2022

Development of a Modified Dehusking Machine for Local Varieties of Coconut

Submitted
September 29, 2022
Published
2022-09-29

Abstract

Traditional dehusking of coconut is time consuming, not effective, not economical, and a difficult process, coupled with high cost of importing previously developed dehusking machines. This work is aimed at developing a coconut de-husker that is affordable, user friendly, and has a higher productivity. Consideration was given to the three main varieties available in Nigeria; West African tall, hybrid and dwarf green varieties. All materials selected for the construction were locally sourced. The machine consists of two rollers made up of mild steel with spikes, shafts, electric motor, spur gears, block bearings and the mild-steel frame. Torque and speed reduction required for de-husking were calculated for average Nigerian coconut of 300-450 mm length, and 160-206 mm diameter. Spikes of length 20 mm at 1350 sharpened edge were arranged on the rollers. While the number of pinion teeth was 18 and gear teeth was 44. The total cost of production was ₦167,000 ($288). Performance test shows an efficiency of 90.4 % and dehusking of 80 coconuts per hour. No distortion of extracted fibre length was observed. It is appropriate for use in sub-Sahara region.