08-16-2017, 10:46 PM
DESIGN, IMPROVEMENT AND THRUST BEARING ANALYSIS OF OIL EXPELLER MACHINE
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Introduction to Processing of mustard-rapeseed
Oilseed processing
Various small-scale techniques are available to process oilseeds locally. Careful
consideration is needed to select the system that will best suit the local
circumstances. These circumstances include the scale of operation required, the
availability of a power source, and a number of other factors.
Raw material preparation
Oilseeds and nuts should be properly dried before storage, and cleaned to remove
sand, dust, leaves and other contaminants. All oil-bearing materials need to have
the correct moisture content to maximize the oil yield. Using small-scale
expellers, oilseeds and nuts are usually processed cold
Oil Extraction Methods
Ghani
Solvent extraction
Expeller
Ghani
The ghani consists of a large mortar and pestle, the mortar being fixed in the
ground and the pestle being moved within the mortar by animal traction (donkey
or mule) or (more commonly) a motor. Oilseeds are placed in the mortar and the
pestle grinds the material to remove the oil. The oil runs out of a hole in the
bottom of the mortar and the cake is scooped out by hand. This method is slow
and requires two animals, replacing the tired one with another after about 3-4
hours of work.
Solvent extraction
Solvent extraction plants use hexane as a solvent to extract oil from oilseed cake.
These plants are expensive and only suitable for large volumes which justify the
capital cost of equipment. Where large amounts of oilseed cake are available,
solvent extraction becomes a commercially-viable option to extract the residual
oil left in the cake and leave an almost oil-free powder known as oilseed meal.
Both cake and meal are incorporated in animal feeds.
Oil Expeller
Oil expeller are advanced oil processing machinery, characterized by their high
oil output rate with good quality, simple design, easy to use and continuous
operation. They can use for various raw materials, such as peanut, beans, rape and
cotton seeds, sesame, olive, sunflower, coconut, grass seed etc
An expeller consists of a helical thread (worm assembly) which revolves
concentrically within a perforated cylinder (the cage or barrel). The barrel is
usually formed by a series of axially-placed lining bars contained within a robust
frame.