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Bulk density using weight, funnel mouth diameter 40mm, test method according to GB1353) 2009 Appendix A corn bulk density determination method. Moisture according to GB/T 5497) 1985 moisture method. The corn cobs were spread out after peeling, and were naturally air-dried in the laboratory, and the moisture and the bulk density were measured with the precipitation of corn.
In the new national standard, it is stipulated that the direct measurement of the bulk density of corn with moisture no higher than 1810%, and the measurement of the bulk density after the precipitation of more than 1810% of corn in accordance with the provisions of Appendix B. In order to understand the process of natural precipitation, this experiment used more than 1810% of corn without precipitation and directly measured the bulk density. Therefore, it cannot be used as the true value of the bulk density, and it can only serve as a reference. High-moisture corn can be freely dropped in the grain cylinder as an adoption standard, so the level of moisture varies.
The effective determination of corn kernels with different water content through the weight-receiver showed that the bulk density vs. water change curve shows that as the moisture content decreases, the maize bulk density increases. When the corn moisture content exceeds 18%, the bulk density decreases with the change in water content. Large, bulk density measurement value is not stable; corn moisture less than 18% when the decline is small, bulk density values ​​still fluctuate.
The determination of the bulk density of the corn using the bulkhead must ensure that the measured bulk density of the corn is stable, so as to ensure stable grades. Because the corn has a certain amount of safe moisture, the moisture content of corn is kept at about 1410%. The measured bulk density can be guaranteed to be relatively stable. Therefore, in practical work, the use of bulk density to reduce corn moisture programmatically with changes in moisture can increase the bulk density of corn, increase the rank of corn, increase benefits, and enhance market competitiveness.
The planting area of ​​corn in China is very wide. After the United States, corn is an important raw material for food feed and chemical products. In China, the quality of many grains such as corn has been measured based on weight. So what is weight bearing? In fact, it refers to the quality of grains and oil grains within the unit volume. The size, shape, moisture content, and internal structure of the grain all determine the bulk density of the grain. The test operation process such as the determination of the weight-reset level is simpler than the test operation process such as setting the pure grain rate, and the operation of the instrument prevents the arbitrariness of the manual inspection and makes the inspection result more accurate.