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13
UNIFORM
REGULATE
D AIR FLOW
UNDERCOV
ER
OVERCOVE
R
PARTICLE
TILT
VIBRATION
PARTICLE
WEIGHT
DIRECTION
OF
VIBRATION
Figure 3: The Forces of Separation due to side tilt, air flow, and deck vibration.
In general the product will be separated into three categories; (1) a heavy or acceptable product, (2)
a light or reject product, and (3) a small middling product. If there are other heavy trash objects or
dirt, these will be separated into a fourth product.
II. What a Gravity Separator can and cannot separate
I Rule 1
Particles of the same size but differing specific gravities can be separated.
HEAVY LIGHT
Figure 4: Particles of same size but different specific gravities
An example of this process would be the separation of similar size seeds where the lighter seeds
have been hollowed out by lack of development or insects.