Abstract
Pigeonpea is mostly consumed in the form of splits, and it provides a good source of proteins. An abrasive carborundum roller cylindrical mill was generally used in small scale to dehusk and splits pulse grains to make dhal. The independent milling parameters of laboratory scale dhal mill were roller speed and feed rate. The oil treatments to the pigeonpea grains were given after pitting. The milling parameters were (i) roller speed (1000, 1200 and 1400 rpm) (ii) feed rate (50, 60, 70 and 80 kg/h). Two factor completely randomized design was used to optimize the hulling efficiency. Roller speed and feed rate showed significantly effect on the hulling efficiency. The maximum hulling efficiency of 73.53% was found with 1400 rpm roller speed and 60 kg/h feed rate. Dhal recovery was 63.18%.
Highlights
Pigeonpea is mainly consumed as dhal because it takes less time to cook and has acceptable appearance, texture, palatability, digestibility, and overall nutritional quality
The maximum husk fraction of 12.13% was obtained with 1400 rpm roller speed and 50 kg/h feed rate (R3F1), whereas minimum husk fraction of 9.09% was observed with 1000 rpm roller speed and 80 kg/h feed rate (R1F4)
The maximum dhal fraction of 63.18% was recovered with 1400 rpm roller speed and 60 kg/h feed rate, whereas minimum dhal fraction of 37.58% was obtained with 1000 rpm roller speed and 80 kg/h feed rate
Summary
Pigeonpea is mainly consumed as dhal because it takes less time to cook and has acceptable appearance, texture, palatability, digestibility, and overall nutritional quality. The recovery of dhal varies from 60 to 75%, depending upon the type of pulses and techniques adopted by the millers such as methods of pre-treatment and milling machinery used. Semi automatic mini pulse mill is other type of pulse mill for dehusking and splitting pulses. A concentric cylinder abrasive roller mill has been developed for dehusking and splitting of pulses; it has a constant clearance between outer and inner roller to give even abrasion. Considering these an attempt was made to describe the mill and its performance evaluation by systematic study of machine parameters, leading to increase the dhal recovery and reduce losses
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