Because the particle shape is very complex, there is no unified technical standard of particle size at home and abroad, and each enterprise has its own definition and representation method of particle size index.
1. Mesh refers to the number of empty eyes per square inch screen, 50 mesh refers to the number of holes per square inch, 500 mesh means 500 mesh, the more gao, the more holes.
In addition to representing the holes of the sieve, it is also used to represent the diameter of the particles that can pass through the sieve. The higher the mesh number is, the smaller the particle size will be.
For example, 30 mesh means 1inch has 30 meshes.
1inch of the 30 is the width of the network line plus space width, different manufacturers network line width and space width ratio slightly different, the standard is 2:3, that is, the space only accounted for 3/5 of the width.
In this way, 30 mesh is equivalent to 25.4/30*3/5=0.508mm.
The number of 6.25 micron meshes in the question can be calculated as follows: 25.4*1000/(6.25/3*5)=2448 meshes.
2. The particle size of powder is called particle size.
Because the particle shape is very complex, there are usually several representation methods, such as sieve size, settlement size, equivalent volume size, equivalent surface area size, etc.
At present, there is no uniform technical standard of powder particle size at home and abroad, and each enterprise has its own definition and representation method of particle size index.
In different countries, different industry screen specifications have different standards, so the meaning of "eye" is difficult to unify.
3, the screen size is the size of the screen through which the particles can be screened, in 1 inch (25.4mm) width of the screen in the number of screen holes, so called "mesh number".
4. Our country adopts the American standard.
Please refer to the following table:
