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Reading: Performance Evaluation of a Screw Type Oil Expeller for Extraction of Sesame Oil

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Performance Evaluation of a Screw Type Oil Expeller for Extraction of Sesame Oil

Authors:

D.M.S.P. Bandara ,

Institute of Post Harvest Technology, LK
About D.M.S.P.
B.Sc.Eng. MEng (Manufacturing), AMIE (Sri Lanka),NSF/STMIS/09/2466, Executive committee member of IESL-NCP Centre, Mechanical Engineer, Institute of Post Harvest Technology, Anuradhapura.
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T. M. R. Dissanayake,

Institute of Post H arvest Technology, LK
About T. M. R.
B.Sc.Eng. MEng, AMIE(Sri Lanka) Mechanical Engineer, Institute of Post H arvest Technology (IPHT), Anuradhapura
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H. M. A. P. Rathnayake,

Institute of Post Harvest Technology, LK
About H. M. A. P.
B.Sc.Eng., M.Eng, AMIE(Sri Lanka) Act. Senior Mechanical Engineer, Institute of Post Harvest Technology
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D. P. C. Swarnasiri

Institute of Post Harvest Technology
About D. P. C.
B.Sc.(Agric Eng)., MSc(Agr), PGDM, Additional Director, Institute of Post Harvest Technology, Jayanthi Mawatha, Anuradhapura
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Abstract

Sesame, (Sesamum indicum) is one of the oldest and important oil seed crop in the world. The sesame seed apart from providing edible oil is also rich in protein. A study was carried out to evaluate the performance of a medium scale screw type oil expeller for extracting sesame oil. In fact, the mechanized medium scale method has not been previously applied in the oil expelling industry for sesame seed in Sri Lanka. For this experiment, the popular screw type machine with 25 mm shaft pitch, 75x315 mm internal barrel and 4 kW three phase motor were used. The development was made in order to increase the oil expelling efficiency in terms of extract bar clearance, speed of the main spiral shaft and outer body closer to the exhaust out let. The optimum oil yield was 44% obtained under 0.2mm and 0.3mm barrel shaft clearance and the main spiral shaft speed of 75 rpm. The quality of refined oil at maximum oil yield was analysed out in terms of saponification value, free fatty acid and specific gravity. The results obtained for saponification value, free fatty acid and specific gravity were 182.33, 3.3.12 % and 0.917 gcm-3.respectively. Color of the sesame oil was closer to the yellow which revealed by the lightness value (L*) of 26 and positive value b of 8.27. The capacity and energy consumption per kilograms of refined sesame oil were 39kg/hr and 0.103kWh/kg. This study reveals that sesame oil could be obtained using the screw type oil expeller and it can be recommended for medium scale entrepreneurs relative to the traditional Sekku method.
ENGINEER, Vol. 47, No. 01, pp. 17-22, 2014
How to Cite: Bandara, D.M.S.P. et al., (2014). Performance Evaluation of a Screw Type Oil Expeller for Extraction of Sesame Oil. Engineer: Journal of the Institution of Engineers, Sri Lanka. 47(1), pp.17–22. DOI: http://doi.org/10.4038/engineer.v47i1.6857
Published on 27 Jan 2014.
Peer Reviewed

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