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Performance Test of Centrifugal Rice Huller and Screen-roller Polisher (yamemoto Mfg.co. Japan Model Ncm-600s)

MA Quasem
Senior Scientific Officer
Farm Machinery and Postharvest Technology Division, Bangladesh Rice Research Institute, Gazipur-1701

Abstract/ Executive Summary:

Centrifugal rice huller and screen-roller polisher is suitable for hulling and polishing parboiled paddy. Its capacity ranges from 300 to 350 kg/hr (paddy) producing better quality polished rice. Pure bran is produced without mixing with husk. But its adjustment is difficult than ordinary rice huller.

Keywords: Rice huller, Polisher, Capacity, Parboiled rice

Location: BRRI HQ

Start Date: 01-07-1982

End Date: 30-06-1983

Program Area: Farm Mechanization

Non-commodity: Farm machineries, Performance

Objectives:

To test and evaluate the performance of centrifugal rice huller and scree-roller polisher

Methodology:

Centrifugal huller: The huller unit consists of a slotted accelerating disc, a stationary rubber ring and a fan to separate the husk from hulled rice. Hulling operation acts on the centrifugal system. When paddy from hopper falls in the slot of the accelerating disc, due to centrifugal force, it hits the rubber ring and thus husk splits. The fan winnows the separated husk and brown rice is obtained. Polisher: The polishing unit consists of screen-roller polisher and twin blower to keep the rice temperature low and to remove the bran from polished rice. To find the hulling and polishing capacity, quantity of the product and the adjustment of the huller and polisher, BR3 paddy both raw and parboiled was used as material. Huller was tested at different speeds for raw and parboiled paddy and finally its capacity was determined. Polisher was tested at different inlet and outlet valve adjustment for both raw and parboiled hulled rice and finally its capacity was determined. The quality of the products were analyzed to find the suitable speed of the huller and the proper adjustment of the polisher.

Source of Information: Proceedings of BRRI Annual Internal Review for 1983

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The results show that the huller is suitable for hulling parboiled paddy with its speed in between 3150 to 3250 rpm. It is not suitable for hulling raw paddy due to high breakage (36.95%) and unhusked (14.71%) paddy. The capacity of the huller is 348.5kg/hr for parboiled paddy which is less than raw paddy (504.7 kg/hr). The polisher is not suitable for polishing raw hulled rice due to high breakage (more than 25%). It is suitable for polishing parboiled hulled rice where breakage is less than 8%. The position of the inlet valve should be in between 2 to 3 and outlet valve in between 0.5 to 1.5. The adjustment of inlet and outlet valves of the polisher needs very careful operation to avoid blockage in the discharge outlet. The capacity is 300 kg/hr (paddy) for parboiled hulled rice which is less than raw hulled rice.

Knowledge Management: Report/Proceedings