Design and production of a single screw fish feed extruder
Abstract
The design and production of a single screw fish feed extruder was carried out. The first step was the design concept aimed at designing and producing a robust machine for rural fish farmers to help them extrude fish feed pellets from local feed materials available to them. The machine’s detailed parts were designed using design analysis methods, which informed the material selection and specification. Each detailed component design was produced sequentially from the frame to the hopper before final assembly into the fish feed single screw extruder. No-load and load tests were carried out on the machine to assess its performance as well as the extruded feed it produced, in comparison to imported fish feeds. The comparison showed that some of the foreign fish feed had a longer floating time, but the floating time of 0.39 minutes to 1 minutes for the locally extruded fish feed met specification to some extent, but need the incorporation of some floaters to extend their floating time. The feed material was a composition of soybean, maize and other additives. The machine was operated at three speeds 254 rpm, 505 rpm and 761 rpm. And the material extruded was tested at six moisture content levels of 15%, 20%, 25%, 30%, 35% and 40% (wet basis, wb). The power required to run the machine was 2014W. The results show that the machine had an output of 63.2kg/hr compared to the theoretical output of 114.38kg/hr. The efficiency of the extruder was 54%; this was below the imported but efficient to provide an alternative to the imported and to save foreign exchange. The total output was 500kg/day when the machine worked 8hrs/day. The optimum speed and moisture content for highest yield was 761 rpm and 25% moisture content (web) in the mix respectively.
References
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