The difference between the accuracy of the filter bag and the nylon filter: Generally, the unit of filtration accuracy of PE / PP filter bags is expressed in “micrometers (μm)”, while the unit of filtration accuracy of nylon filters and stainless steel filters is expressed in “mesh”.
“Mesh” refers to the number of perforations per square inch of mesh, 50 mesh means 50 per square inches, and 500 meshes means 500. The higher the mesh number, the more holes. In addition to indicating the perforation of the screen, it is also used to indicate the particle size of particles that can pass through the screen. The higher the mesh size, the smaller the particle size.
However, it should be noted that from the definition of “mesh” above, the size of the aperture is related to the diameter of the yarn used for the weaving of the filter cloth. In actual use, it also has a great relationship with the monofilament, multifilament and weaving methods. At the same time, it has a great relationship with the speed of the centrifuge (centrifuge force), the performance of the filtering material, the temperature, etc., so choosing a filter bag suitable for your working conditions is also a very complicated selection process.
Powder particle size is called particle size. Since the shape of the particles is very complicated, there are usually several expression methods such as sieving particle size, sedimentation particle size, equivalent volume particle size, and equivalent surface area particle size. The sieving size is the size of the mesh that the particles can pass through the screen. It is expressed as the number of meshes in the screen with a width of 1 inch, so it is called the “mesh number”.
At present, the calculated diameter of equivalent volume particles is commonly used in the world to express particle size. Expressed in μm or mm.