Issues regarding the selection of activated carbon filter screens

Definition of particle mesh number: The term \"mesh number\" refers to the size or fineness of a material. It is generally defined as the number of mesh holes in an area of 1 inch * 1 inch (the italicized part is incorrect); in other words, it is the number of holes in the sieve through which the material can pass. For example, a 200-mesh material can pass through a sieve with 200 mesh holes in an 1 inch * 1 inch area. By the same logic, the higher the mesh number, the finer the particle size of the material; the lower the mesh number, the coarser the particle size. The specifications of standard sieves vary from country to country. The commonly used Taylor system defines the sieve size by the number of holes per inch in length, which is referred to as mesh count. For example, a 100-mesh sieve means there are 100 sieve holes per inch of the sieve mesh. The sieve hole size corresponds to standard mesh numbers as follows: 2. The relationship between sieve hole size and standard mesh numbers is as follows: Sieve hole size: 4.75 mm, Standard mesh number: 4; Sieve hole size: 4.00 mm, Standard mesh number: 5; Sieve hole size: 3.35 mm, Standard mesh number: 6; Sieve hole size: 2.80 mm, Standard mesh number: 7; Sieve hole size: 2.36 mm, Standard mesh number: 8; Sieve hole size: 2.00 mm, Standard mesh number: 10; Sieve hole size: 1.70 mm, Standard mesh number: 12; Sieve hole size: 1.40 mm, Standard mesh number: 14; Sieve hole size: 1.18 mm, Standard mesh number: 16; Sieve hole size: 1.00 mm, Standard mesh number: 18; Sieve hole size: 0.850 mm, Standard mesh number: 20; Sieve hole size: 0.710 mm, Standard mesh number: 25; Sieve hole size: 0.600 mm, Standard mesh number: 30; Sieve hole size: 0.500 mm, Standard mesh number: 35; Sieve hole size: 0.425 mm, Standard mesh number: 40; Sieve hole size: 0.355 mm, Standard mesh number: 45; Sieve hole size: 0.300 mm, Standard mesh number: 50; Sieve hole size: 0.250 mm, Standard mesh number: 60; Sieve hole size: 0.212 mm, Standard mesh number: 70; Sieve hole size: 0.180 mm, Standard mesh number: 80; Sieve hole size: 0.150 mm, Standard mesh number: 100; Sieve hole size: 0.125 mm, Standard mesh number: 120; Sieve hole size: 0.106 mm, Standard mesh number: 140; Sieve hole size: 0.090 mm, Standard mesh number: 170; Sieve hole size: 0.0750 mm, Standard mesh number: 200; Sieve hole size: 0.0630 mm, Standard mesh number: 230; Sieve hole size: 0.0530 mm, Standard mesh number: 270; Sieve hole size: 0.0450 mm, Standard mesh number: 325; Sieve hole size: 0.0380 mm, Standard mesh number: 400. 1. Mesh refers to the number of openings per square inch of the sieve screen; 50 mesh means there are 50 openings per square inch, 500 mesh means 500 openings, and the higher the mesh number, the more openings there are. In addition to indicating the mesh size of the sieve, it is also used to represent the particle size of particles that can pass through the sieve; the higher the mesh number, the smaller the particle size. 2. The size of powder particles is called particle size. Due to the complex shape of particles, there are usually several ways to represent them, such as sieving particle size, settling particle size, equivalent volume particle size, and equivalent surface area particle size. The screening particle size refers to the size of the holes in the sieve through which particles can pass, and it is expressed as the number of holes per inch (25.4 mm) of sieve width, which is why it is called “mesh count”. Currently, there are no unified technical standards for powder particle size at either the domestic or international level; each company has its own definitions and methods for expressing particle size. There are different standards for screen specifications in various ** and different industries; therefore, the meaning of \"mesh size\" is also difficult to standardize.

Thank you. By this standard, 18-mesh will be sufficient for me; only particles with a size of 1 mm are allowed to pass through. Another issue was identified: according to the definition above, the product of the sieve pore size and the mesh number should be a constant value. Sieve hole size * mesh count: Sieve hole size: 4.75 mm; Standard mesh count: 4 mesh. 19: Sieve hole size: 4.00 mm; Standard mesh count: 5 mesh. 20: Sieve hole size: 3.35 mm; Standard mesh count: 6 mesh. 20.1: Sieve hole size: 0.0530 mm; Standard mesh count: 270 mesh. 14.31: Sieve hole size: 0.0450 mm; Standard mesh count: 325 mesh. 14.625: Sieve hole size: 0.0380 mm; Standard mesh count: 400 mesh. 15.2: There is a significant difference between the finer and coarser mesh counts; I’m not sure why.