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How to select screen correctly
2019-11-22 By zhaozhao
The screening of materials depends on the mesh size of the vibrating screen to control the screening size of materials, so the effective selection of the mesh is the main factor to improve the efficiency of the vibrating screen.
Conversion of mesh number and aperture of vibrating screen: the graduation of Taylor screen is based on the mesh size of 200 mesh 0.074mm, and the aperture of 100 mesh: 200 * 0.074mm ÷ 100 = 0.148mm325; the aperture of 200 * 0.074mm ÷ 325 = 0.045mm.
Mesh size refers to the size of the standard sieve's mesh size, and the mesh size refers to the diameter of the braided wire; mesh number is the number of mesh in the length of 2.54 cm (1 inch), which is called mesh for short. For example: 50 mesh refers to 50 holes within 1 inch, and 500 mesh refers to 500 holes. The higher the mesh, the more holes. In addition to representing the mesh of the screen, it is also used to represent the particle size of the particles that can pass through the screen. The higher the mesh number is, the smaller the particle size is.
The number of mesh specified by the customer is very strict or the industry requirements must be selected according to the national standard. At this time, we must require the customer to specify the aperture of the corresponding mesh. The aperture of the mesh is the standard, but the mesh can have multiple choices.
The particle size of powder is called particle size. Due to the complexity of particle shape, there are usually several representation methods, such as screening particle size, settling particle size, equivalent volume particle size and equivalent surface area particle size. Sieve size is the mesh size of the sieve through which particles can pass. It is expressed by the number of holes in the sieve with a width of 1 inch (25.4mm), so it is called "mesh number". At present, there is no uniform technical standard of powder particle size at home and abroad. Each enterprise has its own definition and representation method of particle size index. There are different standards for screen specifications in different countries and industries, so the meaning of "mesh" is difficult to be unified.
At present, the calculation diameter of equivalent volume particles is commonly used to express the particle size in the world. In μ m or mm. It is important to choose the right screen.
For example 1: the material screened by the customer is soybean protein, which is less grindable, and the service life of the screen can reach more than 6 months. At this time, the standard for selecting the screen is that the wire diameter is smaller, because the screening rate of the wire diameter is higher. For example, if the customer specifies 60 mesh screens, the screen standard selected by Party A is aperture 0.3mm and wire diameter 0.112mm, the mesh number of the measured screen is 61.6 mesh, and the mesh rate of the selected screen is 0.28mm and wire diameter 0.14mm, and the mesh number of the measured screen is 60.5 mesh, and the mesh rate of the selected screen is 44%; if Party C selects aperture 0.25mm, wire diameter 0.125mm, and the penetration rate is 44% according to the national standard, it is also a model The screen machine, the screen rate difference of 9%, the output difference is very clear to know.
Example 2: the material screened by the customer is carborundum. At this time, because of the abrasiveness and particularity of the material, the coarse wire size screen of abrasive grade must be selected. At this time, there is no reason for negotiation.
