Occurrence of seed-coat cracking and mechanically broken soybean of tsurumusume variety when using re-circulating bach dryer
2006
Inoue, K.(National Agricultural Research Center for Hokkaido Region, Sapporo (Japan)) | Murakami, N. | Miyaura, S.
Soybeans, variety Tsurumusume, were dried using a re-circulating batch dryer, which is used for the drying of all kinds of grains including rice, wheat, and soybean seeds. The rate of seed-coat cracking and mechanically broken soybean seeds during the drying process under the automatic temperature control, increased when the moisture content of the grain decreased to 17% w.b. and finally exceeded 4% at moisture contents below 15% w.b.. For the next experiment, the temperature ob the, air flow was controlled manually so as to prevent seed-coat cracking from the test of thin layers. The temperature was calculated from an equation of the maximum distortion of seed-coat and the approximated distortion of the seed-coat using the average moisture content of the seeds and th9 moisture content of the seed-coats in equilibrium with the ambient air conditions. In this case, there was no increase of seed-coat cracked soybean seeds; however, the rate of mechanically broken soybean seeds increased to more than 3% at moisture contents below 17% w.b., which was a significantly higher rate than with drying by unheated air ventilation. This was due to the combined effects of heat distortion in the process of drying and impaction in the transport process involving screw conveyors and bucket conveyors just after the process of drying.
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