Important factor that affects the comfort of the fabric is the air permeability of the fabric. Sportswear and windproof and coldproof clothing have higher requirements on the air permeability of fabrics. Some industrial textiles, such as aircraft parachutes and filter cloths, have special requirements for the air permeability of fabrics. The air permeability of the fabric is determined by the number and size of the warp and weft yarns and the fiber gap in the fabric, and is also related to the warp and weft density, the special number of the warp and weft yarns, and the twist of the yarn. In addition, it is related to factors such as fiber properties, yarn structure, fabric thickness and volume weight.
Air Permeability Test Machine
Fabric air permeability test and principle:
The so-called fabric air permeability refers to the performance of the fabric through the air when there is a pressure difference on both sides of the fabric. That is, under the specified pressure difference between the two sides of the fabric, the air volume flowing through the unit area of the fabric per unit time, the unit is L/mm2s. Because the pressure difference is a necessary condition for air to flow, only when a certain pressure difference is maintained on both sides of the fabric to be tested can air flow in the fabric.
The fabric air permeability test is based on a fixed differential pressure as the benchmark for the air permeability test. The pressure difference stipulated by the test standards of various countries is not consistent. For example, the American ANSI/ASTM, K773, FS191/5450 and Japan’s JISL1096 stipulate that it is 127.4Pa (13mm water column); French NFG07-111 stipulates that it is 196Pa (20mm water column); German DIN 53387 stipulates Clothing fabric is 100Pa (10mm water column), parachute fabric is 160Pa (16mm water column), filter fabric and industrial fabric is 200Pa (20mm water column); British BS5636 stipulates 98Pa (about 10mm water column), etc.; Chinese standard GB/T 5453- 1997 “Determination of Air Permeability of Textile Fabrics” stipulates that the clothing fabric is 100Pa (about 10mm water column), and the industrial fabric is 200Pa (20mm water column).
The air permeability requirements of different fabrics are very different. Even if the same fabric has different requirements for use, the pressure difference between the two sides of the fabric is often different. down to test.
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