WPP - Hot Pre-pressing

Hot pre-pressing before extraction is a highly effective way of preparing oilseeds for chemical extraction. During pre-pressing, a fraction of oil is recovered mechanically. This technology can be included in protocols for pressing of many oilseeds, most often rapeseed and sunflower seed, as it is suitable for seeds with oil content above 25 %. Due to its lower oil content, soya is usually not treated with this method.

After pre-treatment and pre-heating, the seeds are turned into flakes in a flaking mill. This procedure is beneficial since flakes can be heated, dried, and expressed more effectively than seeds. After flaking, the mass flows into stack cookers, which serve for further heating and drying. Material prepared in this way allows much easier oil release in subsequent pressing.



Technology Description

The sequence starts with a temporary container capable of supplying seeds for several hours of operation. Seeds are transported into a thermal stabilization unit before they enter the flaking mill. Here we also suggest you to enhance the procedure with a seed cleaning unit. It is also possible to supplement the technology with weighing equipment at entry, or hulling and hull separation.

Press cakes are carried into a stack cooker; they are heated and dried up to meet optimal parameters for pressing.

Altered seeds are then 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. Press cakes are destined for further processing by extraction.


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 WPP 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).

Technical Parameters

The technology of hot pre-pressing is a comprehensive solution for preparing oilseeds for extraction. This technology is offered at capacities between 80 and 1,600 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.).