There is large need of rice polisher
There is large need of rice polisher with optimised power consumption. Polishing any material is basically a phenomenon of wear. Wear is defined as either mass or volume of material, removed or displaced from a solid surface, which is repeatedly subjected to mechanical stresses by rubbing with another solid surface or surfaces. This involves removal of material from a solid surface by mechanical action, which may be sliding, rolling, impact or combination of these operations.
As rice is most consumable crop in world there is huge need of optimization in the rice milling process. In rice polisher most of the rice grains are break due to extensive force applied to grain to remove bran. Optimization in polishing chamber leads to reduction in the rice breakage. Shape of polishing chamber is more important parameter. As the polishing rotor is prone to wearas milling progress, hence the consideration of easy replacement and minimum downtime is another important factor. Cylindrical polishing chamber is always preferred over conical chamber. Second parameter is the rotating speed of polishing wheel. Peripheral speed more than 600m/s is mostly preferred; however the broken percent of rice kernel nearly doubles when Rotating speed is increased from 600 to 1200 rpm.
Quality of rice after milling process is depends on various factors, which include paddy drying, paddy harvesting conditions, environmental conditions, physical properties of paddy kernels, type of rice and quality of milling system components. The objective of this paper is to identify the optimum parameter to achieve uniformly polished yield of rice with less broken. The selection of vertical and horizontal machine to design has large effect on the head rice yield and vertical design is mostly preferred. The optimum moisture content of paddy rice for milling process was reviewed and it is observed to be varied according to the variety of rice grain and it had the least rice breakage when using three abrasive whiteners in series followed by one friction whitener as a polisher. As the cylinder speed increase from 600 to 1000 RPM, the percentage of broken kernels approximately gets doubled. Rice polishing cylinder material of contains two composite materials were binder material and abrasive material.
The flow of processes in a typical modern rice mill: (1) paddy fed into the intake pit; (2) precleaned paddy moves to the rubber roll husker; (3) mixture of brown rice and unhusked paddy moves to the separator; (4) unhusked paddy is separated and returned to the rubber roll husker; (5) brown rice moves to the destoner; (6) destoned brown rice moves to the rice whitener; (7) partially milled rice moves to the second whitener; (8) milled rice moves to the sifter; (9a) (for simple rice mills) ungraded milled rice moves to bagging station; (9b) (for more sophisticated mills) milled rice moves to the polisher; (10) polished rice moves to length grader; (11) head rice moves to head rice bin.
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