Using electric filters to check impurities, imperfect grains, and pure grains (quality) rates

Impurities refer to substances that have neither food quality nor grain or oil quality, or dissimilar grains. Refers to non-food value substances, and the specific provisions of the standard grain and grains of different types, absolute sieve material under the screen. The amount of impurities in food or oil depends mainly on harvesting, the degree of cleanup after harvesting, and storage and transportation. Imperfect grains refer collectively to food oil particles that are defective but still have food value. For example, worm-eaten grain, disease-plaque grain, germinated grain, moldy grain, damaged grain, frostbite grain, bake-injured grain, or unrefined grain, but still have edible value of grain and oil. As the name suggests, pure grains are imperfect grain grains that do not contain impurities and have no food value.

The methods and precautions for checking the impurity, imperfect grain, and pure grain (mass) rate using a motorized filter are as follows:

1 set of good sieve layer: according to the quality standards set in the sieve layer;

2 According to the provisions, weigh the sample into the upper sieve, cover the sieve cover, and place it on the electric filter;

3 Turn on the power, turn on the switch, select the sieve automatically to the left and right sieves for 1min (110 to 120 rpm);

4 After a few moments of sieving, pour the oversize and undersize into analytical trays and petri dishes (or miniplates), respectively.