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Overview of Permeability Meter
1 , which means
The air permeability is on physical index characterizing the air permeability in the tested sample, mainly for porous materials and other materials with high air permeability, such as textiles, sponges, leather, etc. For woven materials, air permeability depends on the number and size of warp and weft yarn gaps and fiber gaps in the fabric , warp and weft density, yarn twist, fiber properties, yarn structure, fabric thickness and other factors. According to the specific use of the fabric, eine different air permeability is required. For example, the air permeability of the fabric used for parachutes should be strictly controlled within the specified range. If the air permeability is too large, the parachute cannot be fully inflated. The stability of the fabric is poor or even damaged, and relatively high air permeability is required for the fabric used as a carpet. Even when it comes to fabrics for clothing, the air permeability should be modified to make the clothing comfortable to wear, for example, the air permeability of summer clothing should be large and have good heat dissipation, while the air permeability of winter coats should be small to ensure comfort of clothing. Enhance the thermal effect. Therefore, proper air permeability is one of the prerequisites for good fabric performance.
Figure 1 Fabrics for different purposes
2.Status quo
Currently, there are two main air permeability test methods, namely constant flow rate and Pressure difference measurement The air permeability of fabrics mainly uses the constant pressure difference flow rate measurement method, and the method standard that can be referred to is IOS 5453-1997 “Determination of Air Permeability of Textile Fabrics”.
3, test pattern
A specificmte fabric brand for clothing.
4, test device
Fabric Air Permeability Tester:
4.1 Experimental Principle
Use The device can use two methods to measure the air permeability to test the sample. The principle of each method is as follows:
determines flow measurement Pressure difference method: After the sample is clamped, set the Airflow of the air to stabilize the airflow flowing vertically through the sample at a constant flow rate, and then test the pressure difference on both sides of the sample under this condition, and then calculate the airtflow rate parameters such as flow resistance.
Constant Pressure Difference Flow Measurement Method: Sample Clamping After completion, adjust the pressure so that it is on both sides of the sample a constant pressure difference forms, and calculate the air permeability and other parameters of the sample by measuring the air flow rate passing through a certain area of the sample vertically in a certain period of time.
4.2 Scope
(1) It is suitable for testing the air permeability and air resistance of automotive interior materials such as polyurethane, PVC, leather, textile, non-woven fabric, etc.
(2) Suitable for air permeability testing of high polymer porous elatical materials such as sponges, etc. .
(3) Suitable for air permeability testing of textile materials such as cloth, non-woven fabric, etc.
4) Suitable for air permeability testing of leather materials.(5) It can also be extended to apply to the air permeability test of paper materials, such as daily Use paper, roll paper, etc.
(6) Can meet many national and international standards, such as B. ISO 9237, ISO 4638, ISO 5636 , IOS 10655, IOS 5453, IOS 4689.22, IOS 13764, ASTM D737, TAPPI T460, JIS P8117 etc.
4.3 Device parameters
Pressure difference The measuring range is between 0 and 1 kPa and the flow measuring range is between 0 and 1800 l/h.
Constant pressure difference and constant flow are two measurement methods that users can choose freely.
High-precision electronic air flow and air pressure sensors ensure the accuracy of the test data.
The system adopts microcomputer control, liquid crystal display, with menu interface and PVC -Control panel, which is convenient for users to quickly perform test operations and view data.
5 , Test Process
( 1) Cut a sample 10 with a diamEat 12 cm from the surface of the fabric sample.
(2) Clamp the cut specimen to the air permeability tester.
(3) Adjust the pressure control valve to adjust the pressure difference on both sides of the specimen. When the pressure difference on both sides of the sample reaches the set value, the test stops and the device automatically displays the air flow rate passing through the sample under the set pressure difference.
(4) Repeat steps (2) and (3) until all samples are tested.
