No abstract

Warqe processing is carried out dominantly by women using traditional tools such as a bamboo scraper, serrated wooden tool and metal knife where losses in quality and quantity are exceptionally high. Above all, the traditional way of warqe processing causes physically drudgery among the rural women. In an effort to alleviate the problem, an engine is driven warqe decorticating machine was designed, constructed, tested and evaluated at field conditions. The performance evaluation of the machine was made in terms of decorticating capacity, decorticating efficiency, percentage pulp loss, and fuel consumption. The performance evaluation was carried out at three levels of drum speeds (850, 950 and 1050 rpm), concave clearances (1, 3 and 6 mm) and feeding rates (0.037, 0.056 and 0.074 kg/s, these are based on the feeding rates of 1.00, 1.50 and 2.00 kg/27s) to determine the optimum combination of the same. The experimental design laid was factorial, in the splitsplit plot. The maximum decorticating capacity of 255.38 kg/hr was obtained at a drum speed of 850 rpm, concave clearance of 1 mm and feeding rate of 0.074 kg/s. The decorticating efficiency and percentage un-decorticated pulp highly depended on concave clearance rather than other factors. Maximum decorticating efficiency 98.97% and minimum pulp loss of 1.03% were achieved at drum beater speed of 850 rpm and concave clearance of 1mm. The production cost of the decorticator was found to be 28,322.00 Birr. The total operating cost of the decorticator estimated to be, 48,925.38 Birr and the payback period and benefit-cost ratio of the prototype decorticating machine were estimated to be 0.90 years and 1.64, respectively.

Warqe processing is carried out dominantly by women using traditional tools such as a bamboo scraper and wooden plank. The processing practice of warqe into food remained traditional and inefficient. The decortication process through which the separation of fiber and core takes place has been time consuming, much energy demanding and cause drudgery, and unhygienic due to the use of traditional decorticator that consisting of bamboo scraper and wooden plank. In light of the above, effort was made to develop mechanical warqe decorticator in order to improve the processing performances. The objective of this work was to design, fabricate the essential components, assemble, test and evaluate the performance in terms of decortication efficiency, throughput capacity, reliability, simplicity, safety, and cost. The functional parts of the machine included drum beater, breastplate, reduction gears, diesel engine, collecting box, chain and sprocket, feeding table, pulleys, transmission belts, rollers, engine seat, and bearings. The machine was manufactured using locally available materials to minimize cost. The design can further be improved to have better decorticating efficiency and throughput and low cost through the use of materials like aluminum and plastics rather than stainless steel and there is also the possibility of improving on the design and fabrication in view simplifying for mass production which can also attract private manufacturers.