The air permeability of the industrial filter cloth is one of the very important parameters, which can express the filtration accuracy of the filter cloth, which is defined as the rate at which the air flow perpendicularly passes through the sample under the specified sample area, pressure drop and time conditions.
There are three types of units for the air permeability of industrial filter cloth, domestic, American and European (pay attention to the test conditions):
1. The test pressure of L m2 s@ commonly used in China is 200Pa, and the test area is 20cm2;
2. The test pressure of L DM2 min DM min@ commonly used in Europe is 200Pa, and the test area is 20cm2;
3. The test pressure of the commonly used cfm@ in the United States is 125Pa, and the test area is 38cm2;
The conversion of the above three air permeability units (mainly based on the actual test, this formula is for reference only) 1L m2 s=06l/dm2/min=0.197cfm。
In addition, the filter cloth has other important parameters, such as: fabric structure: common are: plain structure, twill structure, satin structure;Density: 10cm, 10cm;Commonly used foreign unit root inch ends inch;Yarn type: tex, dtex, d;Monofilament with mm;S;Gram weight: g m2 commonly used in China;oz yd2 is commonly used abroad;Thickness: mm commonly used in China;Abroad will use um and so on.