What is the concept of “mesh” that is often mentioned when discussing the particle size of solid particles?
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I often hear people talk about the particle size of solids in terms of mesh, and sometimes those numbers are preceded by a negative sign. I would appreciate it if someone could explain this to me.
1. Mesh count refers to the number of openings per square inch of the screen; 50 mesh means there are 50 openings per square inch, while 500 mesh means 500 openings. The higher the mesh count, the more openings there are. In addition to indicating the pores of the sieve, it is also used to represent the particle size of particles that can pass through the sieve; the higher the mesh number, the smaller the particle size. 2. The size of powder particles is referred to as particle size. Due to the complex shape of particles, there are usually several ways to represent them, such as sieving particle size, settling particle size, equivalent volume particle size, and equivalent surface area particle size. The screening particle size refers to the size of the holes in the sieve through which particles can pass, and it is expressed as the number of holes per inch (25.4 mm) of sieve width, which is why it is called “mesh count”. Currently, there are no unified technical standards for powder particle size at either the domestic or international level; each company has its own definitions and methods for expressing particle size. There are different standards for screen specifications in various ** and different industries; therefore, the meaning of “mesh size” is also difficult to standardize. 3. The minus sign in front of the number is generally used to indicate that everything has passed the test; for example, –100 mesh means that the product has passed through a 100-mesh sieve. Currently, in the international community, the calculated diameter of equivalent volume particles is commonly used to represent particle size. Expressed in μm or mm. The table below shows the comparison between the mesh sizes and particle sizes (μm) commonly used in our country. Mesh size in microns: Mesh size in microns, Mesh size in microns, Mesh size in microns, Mesh size in microns: 2.5, 7925; 12, 1397; 60, 245; 325, 47; 3, 5880; 14, 1165; 65, 220; 425, 33; 4, 4599; 16, 991; 80, 198; 500, 25; 5, 3962; 20, 833; 100, 165; 625, 20; 6, 3327; 24, 701; 110, 150; 800, 15; 7, 2794; 27, 589; 180, 83; 1250, 10; 8, 2362; 32, 495; 200, 74; 2500, 5; 9, 1981; 35, 417; 250, 61; 3250, 2; 10, 1651; 40, 350; 270, 53; 12500, 1. Last edited by li*nji on 2007-11-30 12:22.]
The explanation on the 2nd floor is very detailed