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A paddy separator with a gravity separator June 13, 2018 10:37 PM

By : polisher

Kawamura et al. developed a rough rice fine cleaning system by combining
a paddy separator with a gravity separator. An indented cylinder separator was used to separate hulled rice kernels from the whole sound paddy kernels. Choi attempted to introduce indented cylinder separators in RPCs to improve head rice ratio of milled rice products. Optimum values of the trough angle, cylinder inclination angle, and cylinder rotational speed were determined experimentally. It seems previous research works on indented cylinder for broken rice separation are not only scarce but also either theoretically-oriented or empirically-oriented.

Paddy separator, is feasible for separating brown rice from paddy efficiently under reciprocating movement of sieve plate according to different bulk densities, specific gravities and surface friction coefficients between paddy and brown rice. It is particularly suitable for separating mixed or low uniformity grain to improve the purity degree of brown rice. There are two kinds of paddy separator, one is Single-bod, the other is Double-body. Good paddy separating effect can not only increase the whole output greatly, but also increase economic benefit enormously.

Separation of paddy and rice on an oscillating type separator takes place due to difference in specific gravity and surface characteristics of paddy and rice. When a mixture of paddy and rice falls on a separator having a serrated surface and is oscillated at the appropriate frequency, rice settles down under the layer of paddy. If the inclination of deck exceeds the angle of friction between the rice and paddy, the paddy moves down the deck on top of the layer of rice. This angle of inclination exceeds the angle of rolling friction between the paddy and the material of the deck and the paddy after having been separated from the layer of rice rolls down on the deck surface.

The effect of paddy moisture content on rice breakage in paddy husker. It was likely due to the level of moisture content (MC) in some grains, which gave some kind of resistance to breakage because Dilday (1987) reported that rice breakage during the milling process decreased with the increasing paddy moisture content. Ofada had less breakage at 1.78 mm roller gap than at 1.5 mm gap thus agreeing with Matthews et al. who reported that rice breakage was mostly due to mechanical stresses rather than thermal stresses. The least dimension for Ofada was 1.59 mm thus lesser roller spacing would yield more breakage and in turn less head rice.

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