RICE BRAN PELLETS PRODUCTION BY USING AN EXPELLER MACHINE
Misr Journal of Agricultural Engineering
Development and testing an expeller machine for oil extraction as a dual purpose for forming rice bran pellets to maximize the oil extraction rate during solvent extraction was carried out. Four screw revolving speed (0.262, 0.524, 0.786 and 1.05 m/s), three die hole diameter (6, 8 and 10 mm) as well as three levels of moisture content (11.1, 14.2 and 16.1%, w.b.) of two rice bran components (white and dark bran) during extrusion process were used to investigate their effect on the machine
... on the machine performance and the resulting extrudate properties. The results revealed that, the extruder productivity of white bran at the same die hole diameter (10 mm) was increased by 30.3, 35.4 and 25.8%, specific energy requirement by 64.1, 56.7 and 70.4%, durability by 31.7, 23.5 and 18.9%, hardness by 60.1, 84.4 and 74.5% when screw speed increased from 0.262 to 1.05m/s with bran moisture content 11.1, 14.2 and 16.1%, respectively. While, at the same screw speed (0.786 m/s) and die hole diameter (6 mm), the productivity was decreased by 10.2% and hardness by 24.3%, while energy requirement increased by 24.9% and durability by 10.5% with increasing moisture content. The same trend was noticed with various operating parameters of dark bran, but the productivity, pellets durability and hardness was higher value by about 12%, 12.3 and 65.2% than the values of white bran, while the energy requirement was lower value by 8%. The regression equations were found and can be used to predict the change of extruder performance and quality of bran pellets under different operating conditions.