The so-called mesh size refers to the particle size or fineness of the material, which is generally defined as the size within 1 inch × The number of mesh in an area of 1 inch is the number of mesh of the screen, and the number of mesh through which the material can pass is defined. The higher the mesh, the more holes. In addition to indicating the holes of the screen, it is also used to indicate the particle size of the particles that can pass through the screen. The higher the mesh number, the smaller the particle size. The standard screen needs to cooperate with the standard vibrating screen machine to accurately measure.

The particle size of powder is called particle size. Because the shape of particles is very complex, there are usually several expression methods such as screening particle size, sedimentation particle size, equivalent volume particle size and equivalent surface area particle size. The screening particle size is the size of the mesh through which the particles can pass. It is expressed by the number of mesh holes in the mesh with a width of 1 inch (25.4mm). Therefore, it is called "mesh number".

Role of dust screen permeability:

The air permeability of the dust-proof net ensures that the equipment can effectively block dust and dirt, and at the same time, it can ensure that the equipment can still maintain good air permeability under changing environmental conditions, thus avoiding the pressure rise caused by the accumulation of internal gas As a result, the sealing strip of the cabinet was damaged, and the sensitive electronic components inside were damaged by water and dust.

1. Equilibrium pressure

All outdoor motor equipment enclosures are subject to temperature fluctuations and wind, rain and sunlight radiation. Once the dust enters the closed cabinet, if it is not removed in time It will corrode sensitive electronic equipment. The dust-proof mesh with good air permeability helps to balance the internal and external pressure of the enclosure, prevent air and moisture from entering the enclosure through the sealing strip, and effectively protect the integrity of the sealing strip. Breathable products can also speed up the emission of water vapor, thereby reducing the accumulation of water vapor inside the cabinet, and quickly eliminating the condensation on the surface of display and other devices.

2. Battery ventilation

In order to prevent the accumulation of explosive harmful gas inside the battery, the dust-proof net with good air permeability can adjust the pressure to avoid gas accumulation. The dust-proof net with good air permeability plays a role equivalent to a mechanical safety valve in this case. For many kinds of rechargeable batteries, such as file ion batteries, the heat generated during the discharge and charging of batteries will increase the pressure in the battery box.