Mechnanical extraction of the oils
MBU 75 (OLEXA)
The largest press available in our plant has been acquired in 2016 in replacement of an older equivalent and is located to a place where it can be fed by our various preparation tools (cooked flakes, cold or warmed seeds, extruded material).
This press of French construction (OLEXA, Arras) dispose of a theoretical capacity of 400 kg with cold unprepared rapeseed. The shaft is powered by a 22 kW motor fitted with a frequency variator allowing rotating speeds comprised between 5 and 21 rpm. The cage diameter is 180 mm and 2 main screw profiles are available for processing a wide range of seeds. It is also possible to modify the diameter of some conical rings or the space between the cages bars for adapting the press to the specificities of each material.
The press is fitted with a feeding screw which function is to improve the filling of the main screw. The shaft has the possibility to be warmed by steam or cooled by water. These possibilities are facilitating the mechanical extraction of sensitive material when the presse becomes hot or when the fats have a high melting point and their high viscosity is an issue.
Press MBU 20 (La Mécanique Moderne – Olexa)
The MBU20 press has the same supplier than the MBU 75. It is the smallest OLEXA’s model compatible with a 24/24 use. This press is powered by a 7.5 kW motor. Its cage diameter is 100 mm. This model was acquired for studying the mechanical extraction of oilseeds. It is fitted with a frequency variator and a large number of thermocouples to measure the temperature profile of the cage. A device for collecting oil under each section of the cage allows easy measurement of the flows.
That press is installed on a mobile chassis that permit easy displacement to make it possible to feed it by various upstream processing. It has been used for example for the study of Jatropha curcas pressing that one can consult by following this link.
OLEANE (La Mécanique Moderne – Olexa)
The OLEANE press is an “artisanal” press marketed by OLEXA for occasional and limited duration use. It was developed to answer the demand of the farmers wanting to produce their own oil and oilcake, especially for enabling the consumption of auto-produced cakes in cattle feeding and oil as tractor fuel. It was dimensioned to process about 50 kg/h of seeds. It is powered by a 2.2 kW motor. The screw has a 80 mm diameter. Our OLEANE was fitted with frequency variator to adjust the rotating speed. It has also a pre-heating device allowing increasing and maintaining the cage temperature if required
The komet press has a capacity of about 5kg/h with rapeseed. Contrary to the other available presses, its screw does not generate pressure by progressive reduction of the volume generated by the worm rotation. The screw has an uniform design and the compression is made at the discharge end of the screw by forcing the material through a die of adjustable diameter. Oil exits the press by a perforated cage located upstream in an area of lower pressure. The press rotation speed is tuned by a mechanical variator and its barrel can be heated thank to an electrical resistance.
That simple and robust press can process a very wide range of material going from grape seeds (14% of oil and almost 50% of wood) to completely dehulled sunflower (65-70 % of oil and zero fibre). It can be used for the production of oil samples but its performances cannot be extrapolated to those of larger presses.
This press is made of a hydraulic jack delivering pressures up to 300 bar toward a material placed in a perforated vertical cylinder. Its use is for determination of the oil point, i.e. the minimal pressure to observe the expression of oil. It can also be used to compare various processing route on the compressibility of the material which is maintained at a determined pressure and residence time. This rudimentary press has no temperature control and being entirely manual thus, it is not suited to perform accurate observations.