Paddy separator depends on the inclination of the table
The selled and the nonshelled grains arrive separately from each other at the two longitudinal sides (the lowest and. the highest edge) of the table and can be collected at those places. Of these paddy separator, which have been known for years, depends on the inclination of the table being adjusted to suit exactly the nature of the material to be treated and also on the care being taken that the feed trough extending throughout the whole length of the table should supply the material to the single chambers of the table, arranged transversely of the trough, in exactly the same proportion of mixture. In order to comply with the first condition, the table must be arranged in such manner as to enable it to be inclined at any desired angle. This adjustment must be, however, easy and convenient to effect, if it isdesired to make sure that the miller should really keep changing the inclination after starting the work and noticing the result of the mixture, until the best result is obtained.
Apparent volume was observed to increase as moisture content increased. The ratio between apparent volume and surface area is usually called the characteristic length. Characteristic length has important role in handling irregularly shaped objects. Some of its application includes determination of projected area of particles moving in turbulent air stream, which can be useful in designing grain cleaners, separators, and pneumatic conveyors. As the ratio between surface area and volume increases, the rate of heat and mass transfer from kernel increases, which affects several unit operations such as drying, cooling and heating. The true volume was also found to increase as moisture content increased.
Indented cylinder separators or triers have, the differences in kernel length as their basic separating characteristic and have been using in seed cleaning and grain milling industry. Yamashita et al. (1979) and Yoshitomi et al. (1980) studied the separating mechanisms and the factors affecting the performance of the broken rice separator of indented cylinder type. Later, they conducted experimental tests in an attempt to use an indented cylinder separator for separating rough rice from brown rice in rice hulling process. Kawamura et al. (2006) developed a rough rice fine cleaning system by combining an indented cylinder separator with a gravity separator. An indented cylinder separator was used to separate hulled rice kernels from the whole sound paddy kernels.
paddy husker tests were performed at different impeller speeds using a hard urethane liner, a soft polystyrene liner and without a liner. Type of liner significantly affected the husking performance. Short-grain rice had high husking energy capacity and cracked grain ratio, but a low broken grain ratio compared with long-grain rice.
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