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18-06-14 09:27

Rice mills are turning to innovative rice polisher technology

An increasing number of rice mills are turning to innovative rice polisher technology to deliver new standards, improve quality, enhance food safety and deliver the degree of whiteness and silkiness that consumers demand. Humble beginnings Prior to the advent of modern polishers, several simpler methods were used including pounding the rice using a pestle and mortar, rubbing it on the floor, beating gently with clubs in jute bags and treading by humans and animals. These makeshift means, often carried out in poor hygiene conditions, not only required significant time and energy, but usually resulted in a poorly-finished and significantly damaged rice, with high levels of wastage.
The process began with the rice entering the space between the cone and the wire screen, it was then gripped by the leather strips that rolled the grains over each other and against the leather and wire screen. Then, with the application of a small amount of pressure, the remaining bran particles were removed and the rice became shinier or more transparent.
Unfortunately, this method caused breakages, particularly in long grain rice, thus reducing its value.  Furthermore, the leather strap needed to be replaced periodically, increasing maintenance costs.

The major portion of the total energy consumed in milling of paddy is due to the polishing of rice and concluded that polisher with finer emery grains consumed less energy while the increase in speed and operating pressure resulted in higher energy consumption.

The major portion of the total energy consumed in milling of paddy is due to the polishing of rice and concluded that polisher with finer emery grains consumed less energy while the increase in speed and operating pressure resulted in higher energy consumption. Power requirement of an individual polisher is proportional to the machine output i.e. to cone polisher; other factors such as design, manufacture, type of rest bearing etc. did not much affect the power requirement. The power required per tonne of rice varied with variety, with degree of polish and with number of polisher used. Energy requirement for milling rice depends on number of grains, process, equipment and other parameters. These include grain quality, uniformity of grain size, grain hardness, quality of final product, type/capacity/age/combination of equipment used, fuel/power source, efficiency of driver and power transmission.

rice whitener consists majorly of  two stages: dehulling and  sieving. The dehuller consists of rotary cylindrical sieve which separates the chaff from the rice grains via  the  shaft  and  blade.  Impact method  was  adopted  for  the  removal  of  husk  from  the  rice paddy. After milling the paddy rice, it passes through a vibrating sieve machine where a crank mechanism  converts  rotary  motion  into  a  reciprocating  movement  of  the  sieve  bed.  The vibrating sieve removes the chaffs and the pebbles from the rice grains.

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