SPIRAL OIL PRESS
Oil is extracted from a number of fruits, nuts and seeds for use in cooking and soap making or as an ingredient in other foods such as baked or fried goods.Oil is a valuable product with universal demand, and the possible income from oil extraction is therefore often enough to justify the relatively high cost of setting up and running a small scale oil milling business.
RAW MATERIAL PREPARATION
Oilseeds and nuts should be harvested when fully ripe,cleaned and handled carefully to reduce bruising and splitting.All raw materials should be shorted to remove stones etc. and especialy moldy nuts,which can cause aflatoxin poisoning.When storage is necessary ,this should be in weatherproof, ventilated rooms which are protected against birds,insects and rodents. Some raw materials (for example groundnuts, sunflower seeds) nees dehusking(or decorticating). small manual machine are available to give higher production rates than manual dehusking.
METHODS OF EXTRACTION
There are basically three mathods of removing oil from the raw materials:solvent extraction,hot processing or cold processing.Solvent extraction is not suitable for small-scale processing because of high capital and operating cost,the risk of fire and explosions from solvents and the complexity of the process.Equipment for hot or cold processing is available at different scale of operation from household to industrial scale. Traditional methods of extraction are described below,followed by higher output manual machine and mechanized extraction.
PRICIPLE OF OIL EXTRACTION
Expellers are continuous in operation and work by grinding and pressing the raw material as it is carried through a barrel by a helical screw. The pressure inside the barrel, and hence the yield of oil, are adjusted using a 'choke' ring at the outlet.
Oil is extracted from a number of fruits, nuts and seeds for use in cooking and soap making or as an ingredient in other foods such as baked or fried goods.Oil is a valuable product with universal demand, and the possible income from oil extraction is therefore often enough to justify the relatively high cost of setting up and running a small scale oil milling business.
RAW MATERIAL PREPARATION
Oilseeds and nuts should be harvested when fully ripe,cleaned and handled carefully to reduce bruising and splitting.All raw materials should be shorted to remove stones etc. and especialy moldy nuts,which can cause aflatoxin poisoning.When storage is necessary ,this should be in weatherproof, ventilated rooms which are protected against birds,insects and rodents. Some raw materials (for example groundnuts, sunflower seeds) nees dehusking(or decorticating). small manual machine are available to give higher production rates than manual dehusking.
METHODS OF EXTRACTION
There are basically three mathods of removing oil from the raw materials:solvent extraction,hot processing or cold processing.Solvent extraction is not suitable for small-scale processing because of high capital and operating cost,the risk of fire and explosions from solvents and the complexity of the process.Equipment for hot or cold processing is available at different scale of operation from household to industrial scale. Traditional methods of extraction are described below,followed by higher output manual machine and mechanized extraction.
PRICIPLE OF OIL EXTRACTION
Expellers are continuous in operation and work by grinding and pressing the raw material as it is carried through a barrel by a helical screw. The pressure inside the barrel, and hence the yield of oil, are adjusted using a 'choke' ring at the outlet.