Comparison table of mesh number of crusher screen

The mesh number of the crusher is the number of holes, that is, the number of holes per square inch The larger the mesh, the smaller the aperture Generally speaking, mesh number × aperture (microns) = 15000 For example, the aperture of 400 mesh is about 38 microns, and that of 500 mesh is about 30 microns There are three kinds of standards: American Standard, British standard and Japanese standard, among which the British standard is similar to the American Standard, while the Japanese standard is quite different China uses the American Standard, which can be calculated by the formula given above The mesh size determines the mesh size, while the mesh size determines the large particle Dmax of the screened powder Therefore, we can see that 400 mesh polishing powder may be very fine, for example, only 1-2 μ m, or 10 μ m, 20 μ M Because the mesh size is about 38 microns The D50 of our 400 mesh polishing powder is 20 microns -- number of mesh -- definition of mesh size -- aperture comparison table standard mesh: 1 Mesh refers to the number of empty holes per square inch screen, 50 mesh refers to 50 holes per square inch, 500 mesh refers to 500, the higher the mesh, the more holes In addition to the mesh of the screen, it is also used to represent the particle size of the particles that can pass through the screen The higher the mesh number is, the smaller the particle size is The standard screen needs to cooperate with the standard shaker to accurately measure the particle size 2 The particle size of the powder is called the particle size Due to the complexity of particle shape, there are usually several representation methods, such as screening particle size, settling particle size, equivalent volume particle size and equivalent surface area particle size Sieve size is the mesh size of the sieve through which particles can pass It is expressed by the number of holes in the sieve with a width of 1 inch (25.4mm), so it is called "mesh number" At present, there is no uniform technical standard of powder particle size at home and abroad Each enterprise has its own definition and representation method of particle size index There are different standards for screen specifications in different countries and industries, so the meaning of "mesh" is difficult to be unified At present, the calculation diameter of equivalent volume particles is used to express the particle size In μ m or mm, the standard mesh number and particle size comparison table: what is the unit of mesh? How to convert mesh and micrometer (1) the inner diameter of sieve (μ m) ≈ 14832.4 / mesh number unit of measurement mesh size refers to the size of raw material particles, generally expressed by the large length of particles Mesh refers to the size of the mesh size of the standard sieve In the Taylor standard sieve, the mesh is the number of holes in the length of 2.54 cm (1 inch), which is called mesh for short Taylor standard sieve system: the graduation of Taylor sieve system is based on the mesh size of 200 mesh 0.074mm, multiplying or dividing by the n-th power of the root of the main module (1.141) (n = 1, 2, 3...) If the n power of the square root of number 2 (1.1892) is multiplied or divided by 0.074mm, a series of sieve sizes with finer division can be obtained The larger the mesh number is, the finer the particles are Similar to the magnification of metallographic structure A plus or minus sign before the mesh indicates whether the mesh of the mesh can be missed A negative number indicates that the mesh can be missed, that is, the particle size is smaller than the mesh size; a positive number indicates that the mesh cannot be missed, that is, the particle size is larger than the mesh size For example, if the number of particles is - 100 mesh to + 200 mesh, it means that these particles can leak through 100 mesh but not 200 mesh When screening the particles with large mesh (200), they should be placed under the screen with small mesh (100), and the particles left in the screen with large mesh (200) are - 100 to 200 mesh (same data as * group) the number of holes is the number of holes per square inch The larger the mesh, the smaller the aperture Generally speaking, mesh number × aperture (microns) = 15000 For example, the aperture of 400 mesh is about 38 microns; that of 500 mesh is about 30 microns There are three kinds of standards: American Standard, British standard and Japanese standard, among which the British standard is similar to the American Standard, while the Japanese standard is quite different China uses the American Standard, which can be calculated by the formula given above From this definition, it can be seen that the mesh size determines the mesh size The size of the mesh size determines the Dmax of the large particles Therefore, we can see that 400 mesh polishing powder may be very fine, for example, only 1-2 μ m, or 10 μ m, 20 μ M Because the mesh size is about 38 microns The D50 of our 400 mesh polishing powder is 20 microns Here is a picture of this polishing powder Note that the scale is 50 microns Therefore, it is not appropriate to use the mesh number to constant the particle size of polishing powder The correct way is to use the particle size (D10, median diameter D50, D90) to express the particle size, and use the mesh number to convert the large particle size If you look at the JIS standard of Japanese abrasives, you will find it very scientific The requirements of D3, D50 and D97 are given for each of their abrasives, and the data of different principle particle sizers are different The requirements are very strict For example, D50 is a 2 micron powder, D3 is about 0.9 micron, and D97 is 4 micron What do you mean? Among the so-called 2 micron powders, no more than 3% can be smaller than 0.9 micron and no more than 3% can be larger than 4 micron This is very strict Most polishing powders (including foreign ones) seen on the market can not meet this requirement, especially the fine powder is seriously over standard There is a reason for using mesh number to characterize the particle size of polishing powder The old polishing mill adopts the technology of dry milling and dry sieving, so the D50 of 300 mesh powder is about 9 μ m, and the D50 of 500 mesh powder is about 2 μ M We have been using it in this way, and we can basically guide production and use However, with the emergence of new production technology and the demand for higher precision polishing, this method should also be improved Explanation (2) 1 Mesh refers to the number of holes on the screen per square inch 50 mesh refers to 50 holes on the screen per square inch 500 mesh refers to 500 holes The higher the mesh, the more holes In addition to representing the mesh of the screen, it is also used to represent the particle size of the particles that can pass through the screen The higher the mesh number is, the smaller the particle size is 2 The particle size of powder is called particle size Due to the complexity of particle shape, there are usually several representation methods, such as screening particle size, settling particle size, equivalent volume particle size and equivalent surface area particle size Sieve size is the mesh size of the sieve through which particles can pass It is expressed by the number of holes in the sieve with a width of 1 inch (25.4mm), so it is called "mesh number" At present, there is no uniform technical standard of powder particle size at home and abroad Each enterprise has its own definition and representation method of particle size index There are different standards for screen specifications in different countries and industries, so the meaning of "mesh" is difficult to be unified Appendix: conversion relationship: 1 μ M = 1 micrometres (μ m) = 0.001 millimetere (mm) the empirical formula for conversion of μ m and mesh is as follows: the larger the mesh, the greater the error.