What is the meaning of "mesh" in how many mesh sieves does the sample pass through?

What is the meaning of "mesh" in how many mesh screens does the sample pass through?

Mesh is a way of indicating the size of the screen, and the number of holes per inch of screen is called how many "mesh". The larger the mesh, the smaller the mesh. Countries have different standards for sieve size, so the meaning of "mesh" is not the same. Now the international standard screen, basically using the Taylor screen system, with 200 mesh as the benchmark, the series of two adjacent screens, the sieve size compared to, that is, the sieve area is twice the difference.

What is a microsieve?

Screens with more than 400 mesh are called microporous screens, which are rarely used in academia and commonly used in industry, so there is no international standard. According to the Japanese standard, microporous screen specifications are shown in Table 4:

Table 4 Microporous sieve specifications :