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The importance of caculating the Air permeability of fabric
2019/08/29
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The porosity of fabric has been important for especially the tent fabric, parachute fabric, raincoat fabric and garment, the fabric used in air bags, industrial filters and sail cloth. Moreover, when thermal properties of clothing and body interaction are taken into consideration, there has been the effect of air permeability. Five specimens are used each with a test area of 508mm2 (25.4mm diameter) and the mean air flow in ml per second is calculated from the five results. From this, the air permeability can be calculated in ml per 100mm2 per second.
Air permeability affects the comfort aspect of a garment in terms of air passage through the fabric. High air permeability per unit area of a fabric gives lower protection against winds, especially for outer-wear garments, whereas low air permeability causes heavy body perspiration.
Air Permeability Test is a measure of how well a fabric allows the passage of air through it. Apart from apparel comfort, it is also important for a number of fabric end-uses, for example, industrial filters, tents, sail-cloths, parachutes, air bags and so on.
Five specimens are used each with a test area of 508mm2 (25.4mm diameter) and the mean air flow in ml per second is calculated from the five results. From this the air permeability can be calculated in ml per 100mm2 per second.
The reciprocal of air permeability, air resistance, can be defined as the time in seconds for ImI of air to pass through 100s mm2 of fabric under a pressure head of 10mm of water. The advantage of using air resistance instead of air permeability to characterize a fabric is that in an assembly of a number of fabrics, the total air resistance is then the sum of the individual air resistances.
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