The paddy separator machine effectively gives more yield and simultaneously ensures that the un-husked paddy goes back to husker and the husked paddy is forward to the polishers for polishing the bran rice. To separate unhulled paddy and hulled rice with gravity and soft wheat from hard wheat. The separation is accomplished by passing the grain mix through a series of z shaped baffle compartments mounted on an inclined oscillating table utilizing the difference in the specific gravity and surface texture of the grains. There will be number of trays in this machine depending upon the capacity.

The brokens are normally separated through self-cleaning sieves and discharged directly to the whitening section. The separation of the immature grains is a more difficult problem and, when done prior to paddy separation, a system is normally incorporated into the actual husk aspirator. Quite often, however, the immature grains are separated from the brown rice after the paddy separator, and consequently, it is possible for the immature paddy grains to be blown out with the husks because this method only works on dehusked immature grains.

There are two types of paddy separator:

1. Compartment Separator-The compartment type of paddy separator uses the difference in specific gravity and the buoyancy to separate paddy and brown rice. When paddy and brown rice move over an inclined plane, they move at different speeds depending on their specific gravity, their shape and contact area, smoothness of inclined surface and the co-efficient of sliding friction. Brown grains are smaller, heavier, rounder and smoother and will slide faster than paddy grains. The processing capacity of the compartment separator is dependent on the compartment area. For a 2-ton/hr capacity rice mill, a 45-compartment separator made up of 15 compartments on each of three decks is used.

2. Tray Separator-The tray separator uses the differences in specific gravity, grain length and the co-efficient of friction to separate paddy and brown rice. The oscillation and slope of the tray forces the brown rice to move up the slope and the paddy to slide down. The separation performance of this type of paddy separator is very good. This machine is very compact, easy to adjust, and consumes less power than the compartment type separator.

In principle, the huller can efficiently remove between 80 and 95% of the husk from the paddy in one pass. When setting up a rubber huller it is normal to have 10% of the paddy returned for a second hulling. If efficiencies higher than this are attempted the level of grain breakages will increa.

destoner machine is widely used in the flour milling, rice milling, feed and food processing industries. The material stream is stratified automatically on the working screen according to materials with different physical characteristics such as gravity, volumetric weight, coefficient of friction and suspension velocity etc. High density impurities such as stones can be reliable removal from a continuous material stream with high efficiency.

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