Extrusion-Pressing
Dry extrusion followed by pressing is ideal to enhance the nutritive value of oilseed meal. In collaboration with Insta-Pro International, Desmet is offering the ExPress® technology specially developed to produce high-performance soybean meal for the feed industry.
While the anti-nutritional factors in the soybeans are dramatically reduced by temperature increase in the high-shear dry extruder, the short time exposure to heat has a limited impact on the protein. The pressing of the extruded full-fat soybean enables an efficient, solvent-free, and steam-free mechanical extraction, and produces a soybean meal rich in highly digestible amino acids and metabolizable energy, together with high-quality crude soybean oil. Extrusion-pressing is also possible with rapeseed and sunflower after pre-pressing.
How does it work
The high-shear dry extruder is fed with milled seeds to allow for homogeneous process condition within the extruder feed material. Inside the extruder barrel, feed material will undergo severe mechanical shearing and upon exiting the extruder a complete rupturing of plant cells occurs, turning solid pieces of broken seed into a softened and flowing outlet material where oil is easily available. The high-temperature /short-residence-time condition inside the extruder is critical to ensure an optimal deactivation of anti-nutritional factors while increasing protein digestibility.
Once in the screw press, the friction on oilseed extrudate inside the press cage will allow for maximum oil extraction rate ending up with a press cake with as low as 6 % residual oil. ExPress® meal is known for its performance for producers of meat, milk and eggs. It's been proven to increase animal farming productivity.
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Foots recovery and oil clarification: Oil recovered at the outlet of the press contains suspended solids. After the decanting stage, where most of them are removed, the oil is filtered and cooled before storage.
- Cake Cooling: The hot cake, discharged from the press at around 120°C, is cooled before storage in a vertical or horizontal cooler using counter-current airflow.
EXPRESS® SYSTEM - SOYBEAN MEAL
PRESS-EXPRESS® SYSTEM -SUNFLOWER & RAPESEED
Key advantages
Best of two worlds
Desmet + Insta-Pro collaboration brings together the most reliable and performant technology & long-standing science-based expertise in animal nutrition
Protein quality
Digestibility of soybean protein in animals has been proven higher than soymeal from solvent extraction & other mechanical processes
Steamless
No steam is required to cook or press feed material
High-temperature/ short-residence-time
High-shear dry extrusion allows effective reduction of anti-nutritional factors while improving protein digestibility
Raw materials
Besides soybean, extrusion pressing of high oil-bearing seeds like sunflower and rapeseed remains the most efficient solution for solvent-free, steam-free extraction. This process encompasses pre-press stage followed by extrusion and final pressing.
Sunflower
Rapeseed
Soybeans
Key equipment
ExPress® process relies on proven equipment, including a high-shear dry extruder from Insta-Pro, screw press from RoseDowns, and vertical cooler from Stolz, specially designed to reduce anti-nutritional factor while keeping protein integrity in ExPress® soybean meal, resulting in high oil yield and enhanced protein digestibility.
