Determination of the fineness of flour and grains

The fineness of flour and grains is a key indicator for measuring their quality, directly affecting the taste of food processing, the quality of finished products and the applicability of subsequent processing. For instance, fine flour is suitable for making pastries and steamed buns, while coarse-grained flour is more appropriate for making bread or coarse grain foods. Therefore, accurately measuring the fineness of flour and grains is of vital importance for production and quality inspection.

The determination of the fineness of flour and grains mainly involves separating flour particles of different sizes through standard sieves, and then judging the fineness by the weight ratio of the material on or under the sieve. Professional flour sieves are commonly used to complete the detection. Two key requirements should be noted during the inspection: First, the screen mesh must comply with the pore size specifications stipulated by the national standards to ensure the separation accuracy; Second, the screening process should maintain a stable motion state and a fixed time to avoid result deviations caused by operational differences. For instance, when flour mills produce flour of different grades, they need to test each batch of products through flour inspection sieves to ensure that the fineness meets the national standards or the enterprise's production standards. The quality inspection department will also use this test to determine whether the flour in circulation on the market meets the standards.

The ST114C circular flour inspection sieve is a professional testing instrument developed and manufactured in accordance with the national standard GB/T 5507-2008 "Determination of Fineness of Flour in Grain and Oil Inspection". It is suitable for the fineness determination of flour, grains and other powder materials, and is widely used in quality and technical supervision bureaus at all levels, grain and oil quality inspection departments, food processing plants and schools and other institutions. This instrument adopts a worm gear and worm with stable center of gravity and high precision for variable speed transmission, and is combined with an eccentric connecting rod mechanism to achieve planar rotational motion. Meanwhile, the screen is fixed more firmly through an integrated pressure rod seat with the tray, ensuring the stability of the screening process. The electronic timer equipped with single-chip microcomputer control features high timing accuracy and easy operation. It can achieve functions such as time setting, working timing, emergency stop, and automatic zero return. The soft membrane key switch can also extend the service life of the instrument. Its technical indicators fully meet the requirements of the new national standard GB/T 5507-2008. It is an essential device for the detection of flour and grain fineness.