Development of Sorghum Polishing Machine Type of Three Levels of Polisher Cylinders

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Development of Sorghum Polishing Machine Type of Three
Levels of Polisher Cylinders

Ana Nurhasanah*,  Athoillah Azadi, Daragantina Nursani and Elita R Widjaya
Indonesian Center for Agricultural Engineering Research and Development
Sinarmas Boulevard st., Pagedangan, Tangerang, Banten, Indonesia
*Corresponding author: Alamat email ini dilindungi dari robot spam. Anda memerlukan Javascript yang aktif untuk melihatnya.




The need of polishing the sorghum seed is to reduce the tannin content which is  mainly found in the outer skin of the pericarp layers. The high tannin content can reduce the protein digestibility and cause a constipation. Development of a sorghum polishing machine, type of three levels of polisher cylinders, was carried out to improve the previous design of polisher. Previously, farmers re-fed the sorghum seeds into the polisher up to three times. This study developed a machine working in a single feed polishing mechanism. Previously in 2012 and 2016, the Indonesian Center for Agricultural Engineering Research and Development, Serpong developed an abrasive type of sorghum polishing machine with a repetitive feeding (up to 4 times), so the working capacity was low varied between 50-100 kg/hour. This study aims to modify the polisher machine in order to improve the working capacity. The activities consisted of (i) Development a sorghum seed polisher using a main component of abrasive stone; (ii) Development a three levels of polishing mechanism with a single feeding system; (iii) Modification of the screens rotation mechanism working in an opposite direction of the rotation of the abrasive stones. The good quality of the polished seed is shown by the appearance of a full shape and bright color. The performance tests shows that the output capacities were 100-150 kg/hour with tannin content of 0.09% and 3-5% of broken seeds and whiteness of 44.66% with the appearance of whole grain shape and bright color.

Keywords : sorghum, polisher machine, polisher capacity, sorghum seed quality



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Indonesian Agricultural Environment Research Institute (IAERI)



A. Wihardjaka (1) and L.J. Wade (2)
(1)Research Station of Agricultural Environment Preservation

(2)International Rice Research Institute

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