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The number of holes is the number of holes, which is the number of holes per square inch. 50 mesh means that the number of holes per square inch is 50, and 500 is 500. The higher the mesh, the more holes. In addition to the apertures representing the screen, it is also used to indicate the particle size of the particles that can pass through the screen. The higher the number of meshes, the smaller the particle size.
In general, the number of meshes × aperture (microns) = 115,000. For example, the 800 mesh screen has a pore size of about 19 microns; the 200 mesh screen has a pore size of about 75 microns. Due to the problem of open cell rate, that is, because of the difference in the thickness of the wire used in the weaving of the net, the standards of different countries are different. There are currently three types of American standards, British standards and Japanese standards, of which the United Kingdom and the United States are similar. Japan has a big difference. China uses American standards, which can be calculated using the formula given above.
The particle size of the powder is called the particle size. Due to the complexity of the particle shape, there are usually several representation methods such as sieve size, sedimentation particle size, equivalent volume particle size, and equivalent surface area particle size. The sieve size is the size of the sieve through which the particles can pass through the screen, and is expressed as the number of sieve holes in the screen of 1 inch (25.4 mm) width, and is therefore referred to as "mesh". At present, there is no uniform technical standard for powder particle size at home and abroad, and each enterprise has its own definition and representation method of particle size index. Screen specifications in different countries and different industries have different standards, so the meaning of “mesh†is difficult to unify. At present, the calculated diameter of the general equivalent volume particles is compared internationally to represent the particle size. Expressed in μm or mm.
Number of mesh
(mesh)
Micron
(μm)
Number of mesh
(mesh)
Micron
(μm)
2
8000
100
150
3
6700
115
125
4
4750
120
120
5
4000
125
115
6
3350
130
113
7
2800
140
109
8
2360
150
106
10
1700
160
96
12
1400
170
90
14
1180
175
86
16
1000
180
80
18
880
200
75
20
830
230
62
twenty four
700
240
61
28
600
250
58
30
550
270
53
32
500
300
48
35
425
325
45
40
380
400
38
42
355
500
25
45
325
600
twenty three
48
300
800
18
50
270
1000
13
60
250
1340
10
65
230
2000
6.5
70
212
5000
2.6
80
180
8000
1.6
90
160
10000
1.3
It is not appropriate to use the mesh size to limit the particle size of the powder. The correct method should be to use the particle size (D50, D97) to indicate the particle size and the maximum particle size by mesh. If you have seen the standard JIS standard for abrasives in Japan, you will feel very scientific. Each of their abrasives gives the requirements of D3, D50, and D97, and the data is different when using different principles of the particle size analyzer. The requirements are very strict.
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