Innovative roaster for soybeans, nuts, seeds

A South African agricultural engineer has developed a soybean roaster for farmers to process their harvest on-farm as a feed addition. But this innovative equipment, the first of its kind worldwide, has been found to be applicable in processing of a variety of other seeds and nuts as well. The continuous tumble roaster developed by Fritz Teseling is an efficient, low-tech, affordable machine that can also roast peanuts, maize, coffee beans, pumpkin seeds and most nuts. It can be used to heat sunflower seeds before cold-pressing, as well as for the sterilisation of almost any kind of seed.
Raw soybeans have a protein content of approximately 40% and an oil content of about 20%, making them potentially an excellent addition to animal feed.
However, raw beans are largely indigestible and contain an enzyme which can lead to ammonia poisoning. Proper heat treatment of the beans eliminates both problems, increases storage periods and makes milling easier.
The machine consists of four components – a feed hopper, a container equipped with fan, heating elements and control system, a rotating unit and a standard incubation and cooling unit. The machine has few moving parts and is almost maintenance-free. Its tumble roasting action results in even baking of all product and shows up toxic seeds and nuts, which is important when roasting peanuts for export, for instance.
The roaster is lower-priced and more energy-efficient than conventional equipment which uses gas or infrared heating. Processing costs are less than 1USc/kg.
The basic model has a capacity of 50kg/hour and an energy consumption of 9.2kg/kWh at 150°C. Larger models of 70kg/hour, 250kg/hour and 500kg/hour are available in stainless steel, corrosion-resistant steel and mild steel.
Prices vary from about R40,000 ($5,300) for the smallest stainless steel unit to R198,000 ($26,500) for the 500kg/hour unit.
All units are available for single- or three-phase electricity and are movable.
Contact Fritz Teseling of Roastech: Tel +27-51-435-7342; fax +27-51-435-7344; info@roastech.com