Feasibility of measuring wheat grain hardness by testing bulk samples using a laboratory mill

Piri Saray, Jahangir (2017) Feasibility of measuring wheat grain hardness by testing bulk samples using a laboratory mill. Masters thesis, University of Mohaghegh Ardabili.

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Text (بررسی امکان اندازه¬گیری سختی دانه گندم از طریق بارگذاری نمونه¬های توده توسط آسیاب آزمایشگاهی) Jahangir Piri Saray.pdf Download (474kB) | Preview

Abstract

In this research, it was investigated the feasibility of grain hardness measurement in different classes using laboratory mill and obtained results were compared with the results of uniaxial static loading and PSI index. Wheat classes of Sardari, Azar2, Heidari, Zare and Pishgam were Studied in this research. In addition, two levels of speeds, including 3000 and 5000 rpm and two levels of times including 2 and 3 min were considered in studies. The uniaxial compression tests were carried out by santam (STM-20) machine in department of Biosystem Engineering at university of Mohaghegh Ardabili. Furthermore, PSI index was measured using equipment at grain organization of east Azarbaijan province. Humidity as a main factor in grain hardness was measured and its amount was 6.4% in Sardari class, 5.37% in Heidari class, 5.16% in Azar2 class, 5.96% in Pishgam class and 6% in Zare class. All studied parameters included class, speed and time plus their interaction effect were significant at grain breakage, except interaction of speed and time plus interaction of speed, time and class. Results showed that Heidari class had high level of hardness, and with increasing of speed and time in millingprocess, it causes the increase of grain breakage. The results of measuring grain hardness using laboratory mill and quasi-static loading has quitely close conformity. PSI index was 31.9%, 15.4%T 37.4%, 31.9% and 18.5% in Sardari (very soft), Heidari (hard), Zare (extra soft), Pishgam (very soft) and Azar2 class, respectively. There was a contrary relationship between PSI and amount of protein in the grain. In addition, highest level of hardness (Heidari) had smallest crackness in milling and crackness amount in semi hard, very soft and extra soft types went more and more. Azar2, Sardari, Pishgam and Zare had more crackness, respectively. Also based on compression test data, it was shown that hard wheat bear more force than others but bear few deformation and vice vorsa. Heidari class bear the highest rate of force and smallest rate of deformation, while, Zareh class bear lowest rate of force and highest level of deformation.

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