Air Permeability is the permeability of the gas to the film, coating, fabric and other polymer materials. It is one of the important physical properties of the polymer, which is related to the structure, phase state and molecular movement of the polymer. The air permeability of fabric means the volume of air flowing through the fabric unit area under certain pressure difference. The general gas through the fabric has the interlacing gap and the fiber gap two ways, and with the interlacing space as the main way.
The ability of air through the fabric is the breathability of the fabric, which directly affects the performance of the fabric. If the fabric that summer USES wants to have better air permeability, and the fabric that the winter USES is ventilated sex should be small, assure the clothing has good windproof property, prevent the quantity of heat disperses. Breathability is of great importance to the fabric of national defense and industrial use. For example, the air permeability of the parachute should be moderate, too large to fall too fast; Too slow to slow down. Therefore, the permeability of the fabric has a close relationship with the performance of the fabric, and as people become more and more comfortable in wearing comfort, the research on breathable fabrics is getting more and more attention.
Place with good sample in advance between the up and down test chamber, clamping, first of all to vacuum the low pressure cavity (inferior vena), then the entire system of pumping air into vacuum state, when reach the specified vacuum, close test inferior vena, to the high pressure cavity (cavity) filling the test gas pressure, and ensure the form of a constant pressure difference on both sides of the sample (adjustable), gas will be under the function of differential pressure gradient, is composed of high voltage low voltage side of lateral seepage, through the process in the low voltage side pressure monitoring, thus it is concluded that the test sample of the barrier property parameters.
