Two-level pressing with extrusion is designed for a number of oilseeds, whose oil content is higher than 25 %, such as rapeseed and sunflower seed. This technology takes advantage of extrusion. The first step is cold pre-pressing of seeds; then they are compressed and heated up in the extruder. As the mixture leaves the extruder and expands, cells break up. This, together with increased temperature, facilitates oil release in the final press. Technology can be supplemented with a set that converts the equipment for one-level pressing with extrusion, which allows processing of seeds with oil content less than 25 % (e.g. soybeans).
Reducing the amount of anti-nutritional substances found in soybeans as well as increasing that of bypass proteins, in order to maximize energetic value of the feed, is an easy job for our extruders. Extrusion is also an ideal way of pre-treating the seeds before the pressing itself. Indeed, a combination of mechanical and heat treatment better than extrusion can hardly be found. Material treated in this way is then efficiently processed in the presses, resulting in a high oil yield.
The sequence starts with a temporary container capable of supplying seeds for several hours of operation. For operation in winter times, when seeds could potentially be exposed to temperatures below 15 °C, we recommend adding technology for temperature stabilization. Seeds are transported from the container continuously into the extruder. At this stage, we suggest including equipment for seed cleaning. It is also possible to supplement the technology with weighing equipment at entry, or hulling and hull separation.
Press cakes resulting from the first level are already partially disrupted mechanically and heated up. They are supplied continuously into the extruder, where extrusion occurs at lower energetic costs, owing to the pre-treatment of the seeds. Extruded mass is transported by a conveyor into the final press.
Seeds altered in this way are then gradually compressed in the expeller press and oil emerges through the outlet slits. This oil still contains some impurities (solids) and has to be further processed with separation and filtration.
The technology of two-level pressing with extrusion is a comprehensive solution for oilseed pressing. This technology is offered at capacities between 7 and 1,500 tons of seeds per day. The design routinely meets EU specifications; however, it can be adjusted to wiring requirements from local markets (e.g. USA, Canada, etc.).
The company Farmet offers optional accessories that will satisfy even the most demanding customers. Our delivery can be supplemented with a spectrum of funnels, conveyors, tanks, and equipment for seed pre-treatment as well as for pumping, filtration, refining and storage of oil. Nonetheless, the most convenient solutions are usually our turnkey deliveries, which are optimized from both the technical and economic perspectives, meet all your requirements and include the automatization of the entire process.
Naturally, the EP2 technology also comes with complete engineering and other services, such as technical support, service possibilities, and accessible spare parts. Technologies delivered by Farmet are equipped with the visualization and control system – Farmet Intelligent Control (FIC).