Wheat weight testing process needs attention

Grain quality in a certain volume is called bulk density. Its unit g/L. The volume weight is a comprehensive sign of food quality. It is closely related to grain structure, chemical composition, grain size, moisture content, specific gravity, and impurities. Grains of the same kind, such as full grain, tight structure, and large bulk density, whereas volume weight is small. Therefore, volume weight is an important indicator to assess the quality of food. The weight of grain can also be estimated by calculating the volume of grain storage and the volume of grain piles.

Grain purchase is the first link in the circulation field after grain is harvested, and the quality of good grain purchases plays an important role in ensuring food quality and safety in the follow-up sector. In some standards, such as wheat, corn, etc. are based on the weight of the determination of the basic projects, the volume weight and processing yield is positively correlated, but also through the bulk density can also calculate the grain storage capacity and grain volume, estimate the quality of food. The so-called bulk density refers to the grain quality within the unit volume, it is an important basis for the pricing of the grain during the acquisition process.

China's grain national standard divides wheat into five grades according to its weight. The higher the bulk density, the better the quality of wheat. On the contrary, the quality is worse. The method for determining the bulk density of wheat includes the cylinder method and the custom container method. Since most of the audits come into contact with grassroots grain banks, this article focuses on several aspects that need to be taken into account in measuring the bulk density of wheat by the measuring cylinder method:

One is to focus on the accuracy of the measuring device's electronic bulkhead. The audit audit shall test the diameter, height, volume, and weighing accuracy of the electronic container weight cylinder prior to monitoring. The capacity cylinder with the exhaust cylinder shall be hung on the rings and the large and small hammers shall be moved to the zero point. Check if the zero point at no load is accurate.

The second is to focus on selecting samples by standard sample. Most of the audits used the bulk sampling method. According to the different types of storage of granaries, they were divided into: 1. The method of housing sampling: 2. The method of roundhouse (Tuen).

The third is to focus on the sample detection process. Because of the influence of impurities, unmilled grains, and grain shape on the bulk density of wheat, the sample must be poured into a special sieve prior to monitoring to remove the floating grass, wheat husk, and wheat stalk in the sample. Sample bulk density), remove the impurities such as gravel (which will increase the bulk density of the sample), and take the oversize sample as the sample for determining the bulk density. In the process of weighing, it is necessary to pay attention to the residual sample above the weigh tube to be dumped to avoid inaccurate measurement. For the same sample, take the same detection method more than two times to ensure the authenticity of the test data. At the time of detection, if the data deviation is found to be large, the load receptor should be re-approved.

The fourth is to focus on forensic data to confirm in a timely manner. After the evidence is collected, the on-site forensics, inspectors, and supervisors shall sign and confirm the evidence collection results in a timely manner. If the audited object has doubts about the auditing records recorded by the auditors, conduct another test and verification on the spot to ensure the authenticity of the forensic results. At present, food security has become a global issue of concern. The price of wheat purchased in China has also been increasing year by year. The food acquisition sites must strictly control the quality, so that the acquired food is truly low in moisture and low in impurities. With high weight tolerance, we ensured that the quality of food stored in the store was in line with the standards. In the process of food auditing, the auditors must test the application and payment of relevant grain subsidies. They must audit the grain-related storage levels, must master the method of testing the bulk density, and must check whether the acquisition departments at all levels issue minimums to farmers according to their quality and level. Acquisition subsidies.

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