Author(s): Dania D, Imoh UR, Okeke OR, Onu CE, Okereke EE, Nwangbo TN and Onwe CU

Abstract: A batch plastic mixer was designed for the thorough mixing of thermoplastic pellets and additives (master batch) in order to solve the problem of colour streaks and uneven wall-thickness normally encountered in the plastic end-products of poorly mixed materials using engineering solid works. The mixer was designed to be able to thoroughly mix a 50 kg of plastic materials at a time. The batch mixer has been designed to have 4 baffle points with an impeller diameter of 27.33 cm, impeller blade of 5.44 cm, impeller width of 3.87 cm and impeller of height of 9.33 cm. To avoid vortex formation, which could cause poor mixing point in the mixer, the impeller angle returns to 90o, with the shaft having a motor speed of 7460 rpm and a power rating of 10 hp. The designed mixer has a shaft diameter of 2.5 cm, while the depth and volume of the cylindrical tank were 70 cm and 500 litres respectively.

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