Small Oil Press

Working Theory of Screw Expeller Pressing

Screw expeller pressing is to separate the oil from oil bearing materials by the pressing power which comes from the change of chamber volume, drive from screw worm, resistance of curve teeth at press rings and extrusion friction between oil materials. Under the big pressure created in press chamber, the oil can be discharged from gap of press bars and oil trough of press rings. Either big scale and small scale of screw oil expeller, they have similar theories in screw expeller pressing. Because the screw type seed oil expeller is mainly used by extrusion theory, so it is also called as oil extruder or oil extrusion process..

The structure of Screw Oil Expeller

Screw oil expeller are mainly composed by shift gears box, press cage, feeder, press screw, and machine frame. The five parts are the main structure of screw oil expeller. The screw type seed oil expller is an crude oil processing equipment.

The Process of Screw Expeller Pressing

By using the pressure of dynamic extrusion to extract the oil from material, the material is pushed forward in the press chamber. Except of feeding hopper, the press chamber of the main working parts of screw oil expeller, which is composed of a worm shaft and round bar cage. There are two type single stage press and double stage press. There is only one horizontal chamber in single stage press. Double stage press is to add a straight chamber to single press for first class press.

Worm shaft is a shaft with worms and collars. Every worm have thread pitch and thread depth. With the thread pitch of the worm shaft becoming shorter and thread depth becoming shallow,  the volume of press chamber is reducing from feeding hopper and discharging port. Material is pushing out along the worms. The oil can be extruded out gradually with the increasing pressure from press chamber. There are gaskets between round cage bars, which form gaps where the oil flow out.

Compared to small oil expelelr, big scale seed oil expeller always equipped with scraper in chamber. The edge of scraper comes deep into the chamber and aims at every collars to prevent materials from skidding run in the chamber and return. The scraper can also adjust the thickness of cakes and control the pressure of chamber to reduce oil residue ratio. The big scale screw oil expeller also have cake binder to make the surface of residue cakes smooth and clean. Cooker is usually combined together with oil expeller to make cooking and pressing continuously processing.

The prepress expeller is to prepress oil materials by bigger pressure. The crude cakes are fed into screw oil expeller to press or extracted oil by solvent. So its structure is a little different from common seed oil expeller. The volume of chamber in feeding parts and discharging parts change greater. The capacity of prepress expeller is bigger, too.

The screw oil expeller can work continuously, so it need little labor. The residue cake after oil extraction is small and thin. The screw type seed oil expeller is popular and easy in application. But the main parts in chamber is easy to wear, which need change at a certain time, so the spare parts increase the working cost at a certain extent.

Raw Materials for Screw Oil Expeller

The screw type seed oil expellers are very popular in the process of granule oilseeds such as rape seeds, peanuts, soybean (Soya), sesame seeds, cotton seeds, sunflower seeds, Jatropha curcas seeds, Oil-tea Camellia Seed, canola, coconut, palm oil, palm kernel etc.

Technical Data of Popular Seed Oil Expeller

Small Oil Expeller

YZS-68 Seed Oil Expeller(5.5kw)	Top↑ Raw Material Capacity(kg/hr) Output Rate(%) Output Efficiency Cotton seeds 50-60 12-14 65-72 Soy bean 28-37 10-16 61-65 Peanut kernel 45-60 35-45 91-92 Rape seeds 45-60 30-38 82-85
YZS-80 Seed Oil Expeller(5.5kw)	Top↑ Raw Material Capacity(kg/hr) Output Rate(%) Output Efficiency Rape seeds 80-100 30-35 7.5-8 Ground nuts 80-100 35-45 7 Beans 75-95 10-14 6.5-7 Sesame 80-100 44-47 6.5-7.5 Rape seeds 40-50 (cold press) 10-14 5.5-6.5
YZS-95 Oil Press(7.5kw)	Top↑ Raw Material Capacity(kg/hr) Output Rate(%) Cake Residual(%) Output Efficiency Rape seeds Hot pressing 150-170 30-38 7.5-8 Cold pressing 75-95 28-35   Peanut Hot pressing 150-185 35-45 7 Cold pressing 65-95 32-40   Beans Hot pressing 135-160 10-16 6.5-7 Cold pressing 70-105 8-14   Sesame Hot pressing 150-185 44-47 6.5-7.5 Cotton seeds Cold pressing 95-105 10-14 5.5-8.5
YZS-100 Oil Expeller(7.5kw)	Top↑ Raw Material Capacity(kg/hr) Output Rate(%) Cake Residual(%) Output Efficiency Rape seeds Hot pressing 150-170 30-38 7.5-8 Cold pressing 75-95 28-35   Peanut Hot pressing 150-185 35-45 7 Cold pressing 90-110 32-40   Beans Hot pressing 145-160 10-14 6.5-7 Cold pressing 70-105 8-14   Sesame Hot pressing 150-170 44-47 6.5-7.5 Cotton seeds Cold pressing 85-105 10-14 5.5-6.5
YZS-120 Oil Expeller(11kw)	Top↑ Raw Material Capacity(kg/hr) Output Rate(%) Cake Residual(%) Output Efficiency Rape seeds Hot pressing 295-335 30-38 7.5-8 Cold pressing 100-125 28-35   Peanut Hot pressing 210-295 35-45 7 Cold pressing 85-125 32-40   Bean Hot pressing 250-295 10-16 6.5-7 Cold pressing 105-145 8-14   Sesame Hot pressing 295-335 44-47 6.5-7.5 Cotton seeds Cold pressing 125-145 10-14 5.5-6.5
YZS-130 Oil Expeller(15.5kw)	Top↑ Raw Material Capacity(kg/hr) Output Rate(%) Output Efficiency Rape seeds 333-415 30-38 7.5-8 Ground nuts 350-450 35-45 7 Soybean 290-330 10-16 6.5-7 Cotton seeds (cold pressing) 220-290 10-14 5.5-6.5
YZS-130 Oil Expeller(18.5kw)	Top↑ Raw Material Capacity(kg/hr) Output Rate(%) Output Efficiency Rape seeds 410-500 30-38 7.5-8 Ground nuts 420-500 35-45 7 Soybean 350-410 10-16 6.5-7 Cotton seeds (cold pressing) 320-370 10-14 5.5-6.5
YZS-165 Oil Expeller(22-30kw)	Top↑ Raw Material Capacity(kg/hr) Output Rate(%) Output Efficiency Rape seeds 500-625 30-38 7.5-8 Ground nuts 530-630 35-45 7 Soybean 450-530 10-16 6.5-7 Cotton seeds (cold pressing) 430-500 10-14 5.5-6.5