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The Sundhara Oil Expeller

GATE's Information Service on Appropriate Technology (ISAT) offers technical information and advice to individuals, groups and institutions, free of charge for inquiries only from developing countries. In this column we publish questions and answers that may be of interest to readers of gate magazine.

The German consulting firm FAKT receives some 30 inquiries each year concerning the Sundhara Oil Expeller. A similar number of enquirers also call up GATE's Question and Answer Service asking for information on the newly developed screw press. The requests cover general technical and economic data, and also documentation and plans to enable people to build the oil press themselves.

FAKT developed the Sundhara oil expeller for the GTZ in close collaboration with Development and Consulting Services (DCS) in Butwal, Nepal, in this way combining the long experience in oilseed processing that exists in South Asia with recent advances in expeller technology made in industrialised countries.

A key objective in developing the Sundhara expeller was to create a design that can be manufactured in reasonably well-equipped mechanical workshops in developing countries. For this reason, the design of the Sundhara is not kept as a trade secret, as is the case with the other screw expellers on the contrary, FAKT's aim is to disseminate the manufacturing of the expeller on a wide scale.

In October 1993, DCS and FAKT held a workshop in Nepal in which participants from five South Asian countries discussed the situation of the rural oilseed processing sector in that region and developed strategies for strengthening small-scale oilseed processing. Three important areas for the development of this sector were identified:

• the availability of an efficient oil extraction technology that can be operated sustainably;

• lobbying against restrictive government regulations;

• making the quality of products from small oil mills conform with the expectations of the market.

The design of the Sundhara was reviewed and discussed in detail and the participants have now embarked on implementing the strategies and activities that were developed.


Technical Features of the Sundhara Oil Expeller


30 to 40 kg seed per hour

Power requirements

4 kW


US$ 1,250, when manufactured in Nepal


US$ 13,000 when manufactured in Germany

Type of Oilseeds:

Sundhara can process most oilseed and nuts

Oil extraction efficiency

10 to 12% residual oil in the cake

Collaborations in this field are also developing between FAKT and partners in Tanzania, The Philippines, Brazil and Peru, and FAKT is presently assisting the establishment of a manufacturing capacity for the Sundhara expeller in Nepal, India and Mali.

Isolated oil mill installations are often not sustainable by smaller entrepreneurs since they require a well-developed infrastructure for maintenance and repair. Wear on certain parts of the oil expeller is caused by the abrasive surface of oilseeds and is a normal feature of all such machines, whether they are manufactured in Europe or in Asia. This is why European-manufactured expellers are difficult to run and maintain in the South, and partners are advised to investigate the option of a technology transfer to their own country or region, at least for the manufacture of wearing parts.

FAKT provides consultancy on process design to interested users, brings them into contact with the manufacturers and can provide the design and assist in technology transfer for manufacturing the expeller.

Documentation- general data, illustrations and drawings - are available from FAKT and GATE.

For further information contact:


M. Dietz, R. Metzler, C. Zarate

Stephan-Blattmann-Str. 11,

D-78120 Furtwangen, Germany


K Rudolph

Postbox 5180

D-65726 Eschborn, Germany