Cause considerable damage to rubber roller husker

The most disturbing presence in rice hull is high proportion of silica which causes considerable damage to rubber roller husker through excessive wear of machine parts and interconnecting transfer facilities.

The conventional way to husk rice is to pass it between two rubber rollers that are rotating with a surface speed differential. The resulting normal pressure and shear stress causes the husk to be peeled away from the kernel. The process is suited to high rice flow rates, but is energy intensive and can result in considerable wear to the surfaces of the rollers. The operating parameters for machines of this design are usually determined and set empirically. Some experiments and calculations had been carried out in order to explore the mechanisms involved in husking rice grains using this method.

A simple sliding friction rig with load cell and high speed camera was used to observe the mechanisms that occur during husking. The husking performance of different rubbers was compared for changes in the applied normal load. It was found that grains rotate between the rubber counter-faces on initial motion before being husked. In addition, harder rubbers were found to husk a higher proportion of entrained grains at lower applied normal load. By measuring the coefficient of friction between rice and rubber samples, the shear force required to husk a given percentage of grains could be calculated and was shown to be constant regardless of rubber type.

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