Inevitably, there will be machine wear in milling production, which will result in powdered grains containing magnetic metal. If the content of such substances exceeds the standard, it will inevitably lead to a decline in the quality of food and cause certain health problems for consumers. damage. Therefore, the content of the flour quality test shall not exceed 0.0038/kg. At the same time, the acicular metal with a length of more than 0.3mm shall not be allowed in the powder, so as to avoid piercing the esophagus, stomach wall and intestinal wall and endangering human health. In order to eliminate the harm of magnetic metal materials, iron-supplying equipment is used in the process of milling, from raw material cleaning to finished product packaging. However, magnetic metal materials in powders sometimes exceed the allowable limits due to uncontrolled flow of powders or reduced magnetic properties of magnets. Therefore, in the quality standard of powdered grains, magnetic metal content is regarded as an important control index for formulation and consumption. According to the Ministry of Commerce, powdered foods that do not meet the standards cannot be used for food. Magnetic metal detectors can determine relevant data for magnetic metals in powdered foods.
The pot used to weigh the magnetic metal in the t-Sheng sample has no requirement for constant weight before and after dressing. This operation brings about a large t-error. We know that the magnetic metal contains t in the powder is very low, the national standard allows the maximum containing t is 0.003 which k8, that is, a magnetic sample of magnetic material separated from the maximum allowable t is 0.0039. Therefore, the project said The accuracy of t is demanding. After the heavy t-method, the accuracy of t and the choice of instrument are determined according to the size of the result of the measurement item.
For a project with a large measurement result with a magnetic metal material analyzer, the constant requirement is relatively low, whereas, for a project with a small measurement result, a constant requirement is high. For example: moisture measurement: the content of moisture in grain is generally more than 10%, so when the determination using a sense of balance of 0.0018, after the constant weight of the box is required to 0.005%; and the oil containing oil is generally about 0.2% t, Therefore, a balance with a volume of 0.00018 is used for the measurement and t is called, and the constant weight requirement is 0.0019. The maximum allowable content of magnetic metal in powders is 0.003s/kg, and the accuracy requirement is high. The constant weight requirement should also be high. However, there is no requirement for constant weight in the method stipulated in the GB5509-85 standard. Drying and weighing randomly before and after serving in the pot will result in relatively large errors in the results of the two appraisals before and after, and they often go in and out within the range of milligrams. Whether the sample is qualified or not, judging whether it can be eaten depends on the value of this gram.
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