Paddy husker is used to remove the chaff

Paddy husker is a machine that is used to automate the processing of removing the chaff (outer husks) of rice grains accurately and with minimal breakage. Throughout history, there have been numerous techniques to hull rice. Traditionally, it would be pounded using some form of mortar and pestle. An early simple machine to do this is a rice pounder. Later even more efficient machinery was developed to hull and polish rice. These machines are most widely developed and used throughout Asia. The paddy husker(rice huller) realizes the hulling purpose through press and twist force between a pair of rubber rolls and by weight pressure. Rubber rollers may be used to reduce the amount of breakage of the grains, so increasing the yield of the best quality head rice. The hulled material mixture is separated into brown rice and rice husk by air force in the separating chamber.

The paddy rice is parboiled before the milling process. When the paddy is fed into the hopper of the dehuller, the blade is adjusted to the diameter of the paddy. The impaction led to the removal of husks and the blower separates the shaft from the rice. The rice and other impurities enter into the sieving bed of the vibrating sieve where the pebbles are separated from the rice.

Poor mastery of parboiling and milling techniques as part of major factor exacerbating rice quality problems, resulting in low market price, which in turn led to very low returns to rice processing activities. It was clear from his study that the major challenge to improve rice quality was the development of low cost but technically efficient and cost effective parboiling and milling technologies. Careful drying after harvest, threshing and parboiling is essential to prevent mould formation, discoloration and fermentation of the rice paddy. The milling stage is the point where actual dehulling (or dehusking) occurs. Dehusking is the removal of husk or hull. The rice milling operation is the separation of the husk (dehusking) and the bran (polishing) to produce the edible portion (endosperm) for consumption. There are mainly three methods of rice dehulling (or dehusking) in Nigeria. These are traditional or hand-pounding method, the small-mill processing method and the large-mill processing method.

Paddy separator is mostly used to separate product on the basis of the differences in their sizes and multi screen separators are used for classifying grains to size grades. Some screen separators incorporate fan to remove light particles.

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